Specific embodiment
Embody feature of present invention to describe in detail in the explanation of back segment with some exemplary embodiments of advantage.It should be understood thatIt is that the present invention can have various changes in different modes, it neither departs from the scope of the present invention, and explanation thereinAnd diagram is illustrated as being used in itself, and it is not used to limit the present invention.
Refer to Fig. 1, it is the circuitry block schematic diagram of the exchange type power conversion circuit of present pre-ferred embodiments.AsShown in Fig. 1, the exchange type power conversion circuit 1 of the present invention is in order to receives input voltage Vin, the electric energy of such as one alternating voltage, defeatedGo out specified output voltage Vo, and can for but be not limited to comprise one first power circuit 15 and a second source circuit 11Stage type circuit framework, and can be applicable to provide electric energy in power supply unit to a circuit system 2 of an electronic product, thisOutward, exchange type power conversion circuit 1 further includes a first control circuit 13b1, a second control circuit 16b, one first feedback electricityRoad 17b, one second feedback circuit 12b, a bus capacitor Cin, an input rectification circuit 14 and a start-up circuit 13b3.WhereinInput rectification circuit 14 is connected to the input of exchange type power conversion circuit 1, the input of the first power circuit 15 and 1Reference edge COM1 altogether, in order to input voltage VinRectification.
First power circuit 15 has the function of correcting power factors, and exchange type power conversion circuit 1 also can be made to inputThe CURRENT DISTRIBUTION of one input current (not shown) and the envelope curve (envelope curve) at end is similar in appearance to input voltage Vin'sWaveform, and there is a first switch circuit 151, this first power circuit 15 receives input voltage VinElectric energy and open by firstClose circuit 151 on or off and export busbar voltage Vbus.Bus capacitor CinOne end be connected to the first power circuit 15Outfan 15a, bus capacitor CinThe other end be then connected to the first altogether reference edge COM1, it is in order to energy storage or filtering.
First feedback circuit 17b is connected to the outfan 15a and first control circuit 13b1 of the first power circuit 15, its rootAccording to busbar voltage VbusAnd export the first feedback signal VFb1.First control circuit 13b1 is connected to the control of first switch circuit 151The outfan of end processed and the first feedback circuit 17b, and the one first auxiliary power output end 11b with second source circuit 11, openGalvanic electricity road 13b3 and circuit system 2 connect, in order to according to the first feedback signal VFb1Export the first pulse width modulating signalVPWM1And control first switch circuit 151 on or off, by input voltage VinEnergy be converted to busbar voltage Vbus, andThe first control circuit 13b1 power state signal V that also reception system circuit 2 providesst.
Second source circuit 11 and the first power circuit 15, bus capacitor CinAnd circuit system 2 connects, and comprise oneTwo on-off circuits 111, second source circuit 11 is in order to receive busbar voltage VbusElectric energy, and led by second switch circuit 111Logical or cut-off switches and the outfan 11a in second source circuit and the first auxiliary power output end 11b exports electricity respectivelyPressure VoWith the first boost voltage Vcc, and the first auxiliary power output end 11b of second source circuit 11 and first control circuit13b1 and second control circuit 16b connects.Second feedback circuit 12b be connected to the outfan 11a of second source circuit 11 withSecond control circuit 16b, in order to according to output voltage VoOutput the second feedback signal VFb2.Second control circuit 16b is connected toThe control end of two on-off circuits 111, the first auxiliary power output end 11b of second source circuit 11 and the second feedback circuit 12bOutfan, be also connected with first control circuit 13b1, second control circuit 16b in order to according to second feedback signal VFb2OutputSecond pulse width modulating signal VPWM2Control second switch circuit 111 on or off, by busbar voltage VbusEnergy turnIt is changed to output voltage VoWith the first boost voltage Vcc.
Start-up circuit 13b3 can be but be not limited to and first control circuit 13b1, second control circuit 16b composition one controlUnit 13b, this start-up circuit 13b3 is connected with the input of input rectification circuit 14, circuit system 2 and first control circuit13b1, in order to according to power state signal VstAnd use input voltage VinElectric energy come to export start voltage VH, and it is sent toOne control circuit 13b1, makes the first control circuit 13b1 can be by input voltage VinElectric energy be sent to the of second source circuit 11One auxiliary power output end 11b, makes the first boost voltage V on the first auxiliary power output end 11bccIt is promoted to the first controlMore than first operating voltage of circuit 13b1, therefore first control circuit 13b1 just can be because of the first boost voltage VccAnd operate, andExport corresponding control signal to drive second control circuit 16b to operate by first control circuit 13b1.
Will be described below the manner of execution of the exchange type power conversion circuit 1 shown in Fig. 1.Referring again to Fig. 1, when power supply shapeState signal VstFor example, the operating state of high potential when, that is, represent that circuit system 2 needs exchange type power conversion circuit 1 to provide electricityEnergy.Now, start-up circuit 13b3 is according to power state signal VstState and operate, and by input voltage VinElectric energy conversionStartup voltage V for non-zero voltage value (more than zero voltage value)HTo first control circuit 13b1, first control circuit 13b1 will againStart voltage VHElectric energy be sent to the first auxiliary power output end 11b of second source circuit 11, make the first boost voltage VccMagnitude of voltage rise to more than the first operating voltage value of first control circuit 13b1, make first control circuit 13b1 start transportMake, and then control the first power circuit 15, therefore first control circuit 13b1 will be according to the first feedback signal VFb1Constantly output theOne pulse width modulating signal VPWM1Control first switch circuit 151 on or off, so that the first power circuit 15 will inputVoltage VinEnergy change with busbar voltage Vbus, and by busbar voltage VbusMaintain load voltage value, now, first controls electricityRoad 13b1 also will send a control signal (non-icon) to second control circuit 16b, to drive second control circuit 16b to start to transportMake, therefore second control circuit 16b will be according to the second feedback signal VFb2Export the second pulse width modulating signal VPWM2Control theTwo on-off circuit 111 on or off, makes second source circuit 11 by busbar voltage VbusEnergy be converted to output voltage VoWithFirst boost voltage Vcc, to provide electric energy respectively to circuit system 2, first control circuit 13b1 and second control circuit 16b, andSecond control circuit 16b also controls the output voltage V of second source circuit 11oWith the first boost voltage VccMaintain rated voltageValue.
Once working as power state signal VstZero potential or the closed mode of electronegative potential are changed into by the operating state of high potentialWhen, that is, represent that circuit system 2 does not need exchange type power conversion circuit 1 to provide electric energy.Now, start-up circuit 13b3 can basis beThe power state signal V of closed modestAnd decommission, make startup voltage VHMagnitude of voltage be zero voltage value, with reduce need notThe power conversion losses wanted, even if therefore input voltage VinElectric energy can persistently be provided to start-up circuit 13b3, start-up circuit13b3 also will not use input voltage VinElectric energy export non-zero voltage value startup voltage VH, meanwhile, first control circuit13b1 is also because of the power state signal V of closed modestAnd decommission, and output control signal is ordering about second control circuit16b decommissions, consequently, it is possible to correspondence is decommissioned by the first power circuit 15 and second source circuit 11, then makes outputVoltage VoWith the first boost voltage VccBecause second control circuit 16b and second source circuit 11 decommission and be zero voltage value,Therefore exchange type power conversion circuit 1 stops providing electric energy to circuit system 2.
Once circuit system 2 needs exchange type power conversion circuit 1 to provide electric energy again, make power state signal VstWill be byWhen the closed mode of zero potential or electronegative potential is changed into the operating state of high potential, as it was previously stated, start-up circuit 13b3 is by basisPower state signal V for operating statestAnd operate again, to be output as the startup voltage V of non-zero voltage valueH, make the first controlCircuit 13b1 processed will start voltage VHElectric energy be sent to the first auxiliary power output end 11b of second source circuit 11, makeOne boost voltage VccMagnitude of voltage rise to more than the first operating voltage value, so that first control circuit 13b1 is operated again andControl the first power circuit 15 by input voltage VinEnergy be converted to busbar voltage Vbus, and first control circuit 13b1 also willSend control signal (non-icon) again to second control circuit 16b, to drive second control circuit 16b to come into operation, make secondControl circuit 16b controls second source circuit 11 output output voltage VoWith the first boost voltage VccTo circuit system 2, first controlCircuit 13b1 processed and second control circuit 16b, and maintain output voltage VoWith the first boost voltage VccIn load voltage value.
In certain embodiments, the start-up circuit 13b3 of control unit 13b shown in Fig. 1 can omit, for example, will start electricityThe mode that road 13b3 is incorporated in first control circuit 13b1 is being omitted, and then may make up switch type electricity as shown in Figure 2Power-switching circuit 1, therefore, as shown in Fig. 2 first control circuit 13b1 not only maintains the control with first switch circuit 151End, the outfan of the first feedback circuit 17b, the first auxiliary power output end 11b of second source circuit 11, second control circuit16b and circuit system 2 connect, and are connected with the input of input rectification circuit 14.
Therefore as power state signal VstFor example, the operating state of high potential when, that is, represent that circuit system 2 needs to exchangeFormula power-switching circuit 1 provides electric energy, and now, first control circuit 13b1 is according to the power state signal V for operating statestAndBy input voltage VinElectric energy be sent to the first auxiliary power output end 11b of second source circuit 11, make the first boost voltageVccMagnitude of voltage rise to more than the first operating voltage value of first control circuit 13b1, therefore first control circuit 13b1 start transportMake and control the running of the first power circuit 15, that is, first control circuit 13b1 will be according to the first feedback signal VFb1ConstantlyExport the first pulse width modulating signal VPWM1Control first switch circuit 151 on or off, so that the first power circuit 15By input voltage VinEnergy change with busbar voltage Vbus, and by busbar voltage VbusMaintain load voltage value, now, firstControl circuit 13b1 also will send a control signal to drive second control circuit 16b to come into operation, therefore second control circuit16b will be according to the second feedback signal VFb2Export the second pulse width modulating signal VPWM2Control second switch circuit 111 turn on orCut-off, makes second source circuit 11 by busbar voltage VbusEnergy be converted to output voltage VoWith the first boost voltage Vcc, withThere is provided electric energy respectively to circuit system 2, first control circuit 13b1 and second control circuit 16b, and second control circuit 16b is alsoControl output voltage VoWith the first boost voltage VccMaintain load voltage value.
Once working as power state signal VstZero potential or the closed mode of electronegative potential are changed into by the operating state of high potentialWhen, that is, represent that circuit system 2 does not need exchange type power conversion circuit 1 to provide electric energy.Now, first control circuit 13b1 by becauseThe power state signal V of closed modestAnd decommission, and output control signal come to order about second control circuit 16b stop fortuneMake, consequently, it is possible to the first power circuit 15 and second source circuit 11 decommission, then make output voltage VoWith the first auxiliaryVoltage VccBecause second control circuit 16b and second source circuit 11 decommission and be zero voltage value, therefore switch type Power convertCircuit 1 stops providing electric energy to circuit system 2.
Again in certain embodiments, the second control circuit 16b shown in Fig. 1 also can be integrated in first control circuit 13b1Interior, and then may make up exchange type power conversion circuit 1 as shown in Figure 3, therefore as shown in figure 3, first control circuit 13b1 notBut it is connected to the control end of first switch circuit 151, the outfan of the first feedback circuit 17b, the first auxiliary power output end11b, start-up circuit 13b3 and circuit system 2, are connected with control end and second feedback circuit of second switch circuit 111The outfan of 12b, therefore in the present embodiment, first control circuit 13b1 not only can be according to the first feedback signal VFb1Output theOne pulse width modulating signal VPWM1Control first switch circuit 151 on or off, by input voltage VinEnergy conversionFor busbar voltage Vbus, more can be according to the second feedback signal VFb2Export the second pulse width modulating signal VPWM2Control second switchCircuit 111 on or off, by busbar voltage VbusEnergy be converted to output voltage VoWith the first boost voltage Vcc.
Therefore as power state signal VstFor example, the operating state of high potential when, that is, represent that circuit system 2 needs to exchangeFormula power-switching circuit 1 provides electric energy, and now, start-up circuit 13b3 is according to power state signal VstState and operate, and willInput voltage VinElectric energy be converted to the startup voltage V of non-zero voltage value (more than zero voltage value)HTo first control circuit 13b1,First control circuit 13b1 will start voltage V againHElectric energy be sent to the first auxiliary power output end of second source circuit 1111b, makes the first boost voltage VccMagnitude of voltage rise to more than the first operating voltage value of first control circuit 13b1, therefore firstControl circuit 13b1 comes into operation and according to the first feedback signal VFb1Export the first pulse width modulating signal VPWM1Control firstOn-off circuit 151 on or off, so that the first power circuit 15 is by input voltage VinEnergy be converted to busbar voltage Vbus,And by busbar voltage VbusMaintain load voltage value, meanwhile, first control circuit 13b1 is also according to the second feedback signal VFb2DefeatedGo out the second pulse width modulating signal VPWM2Control second switch circuit 111 on or off, so that second source circuit 11 willBusbar voltage VbusEnergy be converted to output voltage VoWith the first boost voltage Vcc, and by output voltage VoWith the first auxiliary electricityPressure VccMaintain load voltage value.
Once working as power state signal VstZero potential or the closed mode of electronegative potential are changed into by the operating state of high potentialWhen, that is, represent that circuit system 2 does not need exchange type power conversion circuit 1 to provide electric energy.Now, start-up circuit 13b3 can basis beThe power state signal V of closed modestMake startup voltage VHMagnitude of voltage be zero voltage value, to reduce unnecessary energy conversionConsume, even if therefore input voltage VinCan persistently provide electric energy to start-up circuit 13b3, start-up circuit 13b3 also will not useInput voltage VinElectric energy export non-zero voltage value startup voltage VH, meanwhile, first control circuit 13b1 is also because of closed modePower state signal VstAnd decommission, therefore first control circuit 13b1 will stop controlling the first power circuit 15 and the second electricityThe running of source circuit 11, then makes output voltage VoWith the first boost voltage VccBecause of first control circuit 13b1 and second source electricityRoad 11 decommissions and is zero voltage value, therefore exchange type power conversion circuit 1 stops providing electric energy to circuit system 2.
In certain embodiments, the start-up circuit 13b3 of control unit 13b shown in Fig. 3 also can omit, such as with shouldThe mode that start-up circuit 13b3 is incorporated in first control circuit 13b1 is omitting, and then may make up switch type as shown in Figure 4Power-switching circuit 1, therefore, as shown in figure 4, first control circuit 13b1 not only maintains the control with first switch circuit 151End processed, the outfan of the first feedback circuit 17b, the control end of second switch circuit 111, the outfan of the second feedback circuit 12bAnd circuit system 2 connects, it is connected with the input of input rectification circuit 14, additionally, as shown in figure 4, the of the present embodimentTwo power circuits 11 can't be in the first auxiliary power output end 11b output the of second source circuit 11 as Figure 1-3One boost voltage Vcc, what is more, in the exchange type power conversion circuit 1 of the present embodiment, have more an accessory power supply 18, with firstControl circuit 13b1 connects, in order to persistently to export the first boost voltage VccTo first control circuit 13b1, make first control circuit13b1 can be utilized the first boost voltage VccAnd operate.In some embodiments, accessory power supply 18 can be the power supply of an extra setting,Also or directly take from busbar voltage VbusElectric energy constituted.It should be noted that the first boost voltage shown in Fig. 4 also may be usedTo take from the first boost voltage of the first auxiliary power output end 11b output of second source circuit 11 as Figure 1-3.
Therefore as power state signal VstFor example, the operating state of high potential when, that is, represent that circuit system 2 needs to exchangeFormula power-switching circuit 1 provides electric energy, and now, first control circuit 13b1 is by according to the power state signal V for operating statestAnd receive the first boost voltage V that accessory power supply 18 is exportedccTo operate, therefore first control circuit 13b1 will be anti-according to firstFeedback signal VFb1Constantly export the first pulse width modulating signal VPWM1Control first switch circuit 151 on or off, so thatFirst power circuit 15 is by input voltage VinEnergy change with busbar voltage Vbus, and by busbar voltage VbusMaintain specified electricityPressure value, meanwhile, first control circuit 13b1 is also according to the second feedback signal VFb2Export the second pulse width modulating signal VPWM2ControlSecond switch circuit 111 on or off processed, by busbar voltage VbusEnergy be converted to output voltage Vo, and electricity will be exportedPressure VoMaintain load voltage value.
Once working as power state signal VstZero potential or the closed mode of electronegative potential are changed into by the operating state of high potentialWhen, that is, represent that circuit system 2 does not need exchange type power conversion circuit 1 to provide electric energy.Now, first control circuit 13b1 by becauseThe power state signal V of closed modestAnd stop receiving the first boost voltage V that accessory power supply 18 is providedcc, therefore firstControl circuit 131 will decommission, consequently, it is possible to first control circuit 13b1 will stop controlling the first power circuit 15 and secondThe running of power circuit 11, then makes output voltage VoDecommission because of first control circuit 13b1 and second source circuit 11 andFor zero voltage value, therefore exchange type power conversion circuit 1 stops providing electric energy to circuit system 2.Certainly, the switch type shown in Fig. 4The first boost voltage V that power-switching circuit 1 is exported using accessory power supply 18ccCarry out continued power to first control circuit13b1, makes the first control circuit 13b1 can be according to power state signal VstState deciding whether to receive the first boost voltageVccElectric energy technology, and the exchange type power conversion circuit 1 shown in Fig. 1-3 is first auxiliary using second source circuit 11Help the first boost voltage V that power output end 11b is exportedccWhether reach first operating voltage of first control circuit 13b1,Controlling the technology that whether operates of first control circuit 13b1, to each other can interactive application it is not limited to as Figure 1-4Embodiment.
Refer to Fig. 5 and coordinate Fig. 1, Fig. 5 is the electricity of the exchange type power conversion circuit of another preferred embodiment of the present inventionRoad block schematic diagram.As shown in figure 5, the circuit structure of the exchange type power conversion circuit 1 shown in Fig. 5 is similar in appearance to shown in Fig. 1Exchange type power conversion circuit 1, only in the present embodiment, control unit 13b is different from Fig. 1, and exchange type power conversion circuit 1It is connected with the circuit system 2 of electronic product by out-put supply adapter 1a.
In the present embodiment, control unit 13b is except comprising first control circuit 13b1, second control circuit 16b and openingOutside the 13b3 of galvanic electricity road, further include a testing circuit 13b2, wherein, testing circuit 13b2 is connected to the output of second source circuit 11Whether end 11a, start-up circuit 13b3, out-put supply adapter 1a and first control circuit 13b1, need in order to detecting system circuit 2Want exchange type power conversion circuit 1 to provide electric energy, that is, detect that out-put supply adapter 1a with the circuit system 2 of electronic product isNo connection, detecting system circuit 2 provides electric energy the need of exchange type power conversion circuit 1, and exports corresponding power supply statusDetection signal Va, and then make the start-up circuit 13b3 can be with power state detection signal VaAnd use input voltage VinElectric energy come defeatedGo out to start voltage VH, and it is sent to first control circuit 13b1, so that first control circuit 13b1 is operated, and then make the first control electricityThe corresponding control signal of road 13b1 output drives second control circuit 16b to come into operation, and this power state detection signal VaAlsoFirst control circuit 13b1 interval or stopping fortune when circuit system 2 provides electric energy without exchange type power conversion circuit 1 can be madeMake, and then control second control circuit 16b interval or decommission.
In the present embodiment, when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, inspectionThe power state detection signal V that slowdown monitoring circuit 13b2 is exportedaOperating state for zero potential or electronegative potential.On the contrary, when useWhen out-put supply adapter 1a is separated by person with the circuit system 2 of electronic product, the out-put supply state inspection of testing circuit 13b2 instituteSurvey signal VaClosed mode for high potential.
Therefore when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, testing circuit13b2 institute out-put supply state detection signal VaFor the operating state of electronegative potential, now, start-up circuit 13b3 can be because power supply shapeState detection signal VaMake input voltage VinElectric energy be sent to first control circuit 13b1, that is, start voltage VHFor non-zero voltageValue, first control circuit 13b1 will start voltage VHElectric energy be sent to the first auxiliary power output end of second source circuit 1111b, makes the first boost voltage VccMagnitude of voltage rise to more than the first operating voltage value of first control circuit 13b1, make firstControl circuit 13b1 comes into operation, and according to the first feedback signal VFb1Constantly export the first pulse width modulating signalVPWM1Control first switch circuit 151 on or off, by busbar voltage VbusMaintain load voltage value, now, the first controlCircuit 13b1 processed exports a control signal to drive second control circuit 16b to operate, and therefore second control circuit 16b is according to secondFeedback signal VFb2Export the second pulse width modulating signal VPWM2Control second switch circuit 111 on or off, will exportVoltage VoWith the first boost voltage VccMaintain load voltage value.
Once when out-put supply adapter 1a is separated with the circuit system 2 of electronic product, testing circuit 13b2 is exportedPower state detection signal VaFor the closed mode of high potential, now, power state detection signal VaStart-up circuit 13b3 can be ordered aboutInterval or stop using input voltage VinElectric energy come to export start voltage VH, this power state detection signal VaAlso make firstControl circuit 13b1 intermittently or decommissions, then is ordered about second control circuit 16b interval or stopped by first control circuit 13b1Running, therefore the output voltage V that second source circuit 11 is exportedoLess than load voltage value or be zero voltage value, exchange type powerChange-over circuit 1 interval or stopping provide electric energy to circuit system 2.
In certain embodiments, the start-up circuit 13b3 of middle control unit 13b shown in Fig. 5 can omit, for example, open thisThe mode that galvanic electricity road 13b3 is incorporated in first control circuit 13b1 is being omitted, and then may make up exchange as shown in Figure 6Formula power-switching circuit 1, therefore, as shown in fig. 6, first control circuit 13b1 not only maintains and first switch circuit 151Control end, the outfan of the first feedback circuit 17b, the first auxiliary power output end 11b and second of second source circuit 11Control circuit 16b connects, and is connected with the input of input rectification circuit 14.
Therefore when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, testing circuit13b2 institute out-put supply state detection signal VaFor the operating state of electronegative potential, now, first control circuit 13b1 is according to low electricityThe power state detection signal V of the operating state of positiona, by input voltage VinElectric energy be sent to the first of second source circuit 11Auxiliary power output end 11b, makes the first boost voltage VccMagnitude of voltage rise to more than the first operating voltage value, first controls electricityRoad 13b1 comes into operation, and according to the first feedback signal VFb1Constantly export the first pulse width modulating signal VPWM1ControlFirst switch circuit 151 on or off, by busbar voltage VbusMaintain load voltage value, now, first control circuit13b1 also exports a control signal to drive second control circuit 16b to operate, and therefore second control circuit 16b is according to the second feedbackSignal VFb2Constantly export the second pulse width modulating signal VPWM2Control second switch circuit 111 on or off, will be defeatedGo out voltage VoWith the first boost voltage VccMaintain load voltage value.
Once when out-put supply adapter 1a is separated with the circuit system 2 of electronic product, testing circuit 13b2 is exportedPower state detection signal VaFor the closed mode of high potential, now, power state detection signal VaFirst control circuit can be ordered about13b1 intermittently or decommissions, then is ordered about second control circuit 16b interval or decommissioned by first control circuit 13b1, therefore theThe output voltage V that two power circuits 11 are exportedoAnd the first boost voltage VccWill be less than load voltage value or be zero voltage value, hand overChange formula power-switching circuit 1 interval or stop providing electric energy to circuit system 2.
Again in certain embodiments, the second control circuit 16b shown in Fig. 5 also can be integrated in first control circuit 13b1Interior, and then may make up exchange type power conversion circuit 1 as shown in Figure 7, therefore as shown in fig. 7, first control circuit 13b1 notBut it is connected to the control end of first switch circuit 151, the outfan of the first feedback circuit 17b, the first auxiliary power output end11b, testing circuit 13b2 and start-up circuit 13b3, are connected with control end and second feedback circuit of second switch circuit 111The outfan of 12b, therefore in the present embodiment, first control circuit 13b1 not only can be according to the first feedback signal VFb1Output theOne pulse width modulating signal VPWM1Control first switch circuit 151 on or off, by input voltage VinEnergy conversionFor busbar voltage Vbus, more can be according to the second feedback signal VFb2Export the second pulse width modulating signal VPWM2Control second switchCircuit 111 on or off, by busbar voltage VbusEnergy be converted to output voltage VoWith the first boost voltage Vcc.
Therefore when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, testing circuit13b2 institute out-put supply state detection signal VaFor the operating state of electronegative potential, now, start-up circuit 13b3 can be because power supply shapeState detection signal VaMake input voltage VinElectric energy be sent to first control circuit 13b1, that is, start voltage VHFor non-zero voltageValue, and first control circuit 13b1 also will start voltage VHElectric energy be sent to second source circuit 11 the first accessory power supply defeatedGo out to hold 11b, make the first boost voltage VccMagnitude of voltage rise to more than the first operating voltage value, first control circuit 13b1 startsRunning, and according to the first feedback signal VFb1Constantly export the first pulse width modulating signal VPWM1Control first switch electricityRoad 151 on or off, by busbar voltage VbusMaintain load voltage value, and first control circuit 13b1 is also according to secondFeedback signal VFb2Constantly export the second pulse width modulating signal VPWM2Control second switch circuit 111 on or off, withBy output voltage VoWith the first boost voltage VccMaintain load voltage value.
Once when out-put supply adapter 1a is separated with the circuit system 2 of electronic product, testing circuit 13b2 is exportedPower state detection signal VaFor the closed mode of high potential, now, power state detection signal VaStart-up circuit 13b3 can be ordered aboutInterval or stop using input voltage VinElectric energy come to export start voltage VH, this power state detection signal V simultaneouslyaAlso so thatFirst control circuit 13b1 intermittently or decommissions, therefore the output voltage V that second source circuit 11 is exportedoWith the first auxiliary electricityPressure VccWill be less than load voltage value or be zero voltage value, exchange type power conversion circuit 1 interval or stop providing electric energy to systemCircuit 2.
In certain embodiments, the start-up circuit 13b3 of control unit 13b shown in Fig. 7 also can omit, for example, open thisThe mode that galvanic electricity road 13b3 is incorporated in first control circuit 13b1 is omitting, and then may make up switch type electricity as shown in Figure 8Power-switching circuit 1, therefore as shown in figure 8, first control circuit 13b1 not only maintains the control with first switch circuit 151End, the outfan of the first feedback circuit 17b, testing circuit 13b2, the control end of second switch circuit 111 and the second feedback electricityThe outfan of road 12b connects, and is connected with the input of input rectification circuit 14, additionally, as shown in figure 8, the of the present embodimentTwo power circuits 11 can't be in the first auxiliary power output end 11b output the of second source circuit 11 as illustrated in figs. 5-7One boost voltage Vcc, what is more, in the exchange type power conversion circuit 1 of the present embodiment, have more an accessory power supply 18, with firstControl circuit 13b1 connects, in order to persistently to export the first boost voltage VccTo first control circuit 13b1, make first control circuit13b1 can be utilized the first boost voltage VccAnd operate.In certain embodiments, accessory power supply 18 can be the power supply of an extra setting,Also or directly take from busbar voltage VbusElectric energy constituted.It should be noted that the first boost voltage shown in Fig. 8 also may be usedTo take from the first boost voltage of the first auxiliary power output end 11b output of second source circuit 11 as illustrated in figs. 5-7.
Therefore when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, testing circuit13b2 institute out-put supply state detection signal VaFor the operating state of electronegative potential, now, first control circuit 13b1 is according to low electricityThe power state detection signal V of the operating state of positionaAnd receive the first boost voltage V that accessory power supply 18 is exportedccTo operate,Therefore first control circuit 13b1 is with the first feedback signal VFb1Constantly export the first pulse width modulating signal VPWM1Control firstOn-off circuit 151 on or off, so that the first power circuit 15 is by busbar voltage VbusMaintain load voltage value, and firstControl circuit 13b1 is according to the second feedback signal VFb2Constantly export the second pulse width modulating signal VPWM2Control second switchCircuit 111 on or off, by output voltage VoMaintain load voltage value.
Once when out-put supply adapter 1a is separated with the circuit system 2 of electronic product, testing circuit 13b2 is exportedPower state detection signal VaFor the closed mode of high potential, now, power state detection signal VaFirst control circuit can be ordered about13b1 intermittently or decommissions, therefore the output voltage V that second source circuit 11 is exportedoWill be less than load voltage value or be zero electricityPressure value, exchange type power conversion circuit 1 interval or stopping provide electric energy to circuit system 2.
Certainly, the first boost voltage V that the exchange type power conversion circuit 1 shown in Fig. 8 is exported using accessory power supply 18ccCarry out continued power to first control circuit 13b1, so that first control circuit 13b1 can be determined according to the state of power state signalWhether receive the first boost voltage VccElectric energy technology, and the exchange type power conversion circuit 1 shown in Fig. 5-7 utilizes secondThe first boost voltage V that first auxiliary power output end 11b of power circuit 11 is exportedccWhether reach first control circuitFirst operating voltage of 13b1, with the technology controlling first control circuit 13b1 whether to operate, to each other can interactive application, notIt is confined to embodiment as shown in figures 5-8.
Due to the first power circuit 15, second source circuit 11, the first feedback circuit 17b, the second feedback circuit 12b andThe huge number of testing circuit 13b2, is exemplarily illustrated the circuit framework of its thin portion below.Refer to Fig. 9, it is applicationThe thin portion circuit structure of the second source circuit of the exchange type power conversion circuit shown in Fig. 1-8 and the second feedback circuit is illustratedFigure.As shown in figure 9, second source circuit 11 comprises second switch circuit 111, the first current rectifying and wave filtering circuit 112, the second rectification filterWave circuit 113 and transformator TR, in the present embodiment, transformator TR comprises armature winding Np(primary winding), secondaryLevel winding Ns(secondary winding) and assists winding Na(auxiliary winding), and second switch circuit 111 byOne first switch element Q1Realize.Wherein, the armature winding N of transformator TRpOne end be connected to first switch element Q1FirstEnd Q1a, and first switch element Q1The second end Q1bIt is connected to the first common reference edge COM1 and control unit with control end13b, by control unit 13b (that is, in second control circuit 16b or Fig. 3,4,7,8 in Fig. 1,2,5,6 first controlCircuit 13b1) the second pulse width modulating signal V of exportingPWM2Make first switch element Q1On or off, and then electricity will be inputtedPressure (that is, busbar voltage Vbus) electric energy via transformator TR armature winding NpIt is sent to secondary windings NsWith assists windingNa, more respectively by the first current rectifying and wave filtering circuit 112 and the second current rectifying and wave filtering circuit 113 rectifying and wave-filtering to export output voltage VoWithFirst boost voltage Vcc.
First current rectifying and wave filtering circuit 112 is connected to the secondary windings N of transformator TRsWith the circuit system 2 of electronic productBetween, and comprise the first diode D1With the first electric capacity C1.First diode D1Anode tap and transformator TR secondary windings NsEvenConnect, the first diode D1Cathode terminal be connected to the outfan 11a, the first electric capacity C of second source circuit 111It is connected to the one or twoPole pipe D1Cathode terminal and second altogether between reference edge COM2.Second current rectifying and wave filtering circuit 113 is connected to the auxiliary of transformator TRWinding NaAnd the first auxiliary power output end 11b between, and comprise the second diode D2With the second electric capacity C2.Second diode D2Anode tap and transformator TR assists winding NaConnect, the second diode D2Cathode terminal be connected to first accessory power supply outputEnd 11b, the second electric capacity C2Be connected to the first auxiliary power output end 11b and first of power circuit 11 altogether reference edge COM1 itBetween.
In the present embodiment, the second feedback circuit 12b comprises first resistor R1, second resistance R2, 3rd resistor R3, three endsAdjustable voltage stabilizing element 121 (3-Terminal Adjustable Regulator) and the first isolation element 122, wherein, the first electricityResistance R1One end be connected to the outfan 11a of second source circuit 11, second resistance R2It is connected to first resistor R1The other end withBetween the second common reference edge COM2, and first resistor R1With second resistance R2Constitute the first bleeder circuit, in order to by output voltage VoCarry out partial pressure in the reference edge 121r of the adjustable voltage stabilizing element in three ends 121, that is, in first resistor R1And second resistance R2BetweenOne connection end partial pressure and export voltage division signal V1.
First isolation element 122 can be but be not limited to optical coupling isolation element (photoelectriccouplingIsolation), the outlet side of this first isolation element 122 is connected to the outfan of the second feedback circuit 12b, according to flowing into theOne first electric current I of one isolation element 122 input side1Size of current output corresponding second feedback signal VFb2.First isolationThe input side of element 122 and 3rd resistor R3It is connected in series in the second end 121c of the adjustable voltage stabilizing element in three ends 121(cathode) and the outfan 11a of second source circuit 11 between, 3rd resistor R3Flow into three ends adjustable voltage stabilizing unit in order to limitSecond end 121c of part 121 or the first electric current I of the first isolation element 122 input side1Size of current.Due to 3rd resistor R3Input side with the first isolation element 122 is to be connected in series just to reach restriction the first electric current I1Size of current effect,Therefore in some embodiments, 3rd resistor R3Permissible with the priority position that the input side of the first isolation element 122 is connected in seriesExchange, contrary with shown in Fig. 9 (not shown).
Three ends are adjustable, and voltage stabilizing element 121 can be selected for such as semiconductor company (NationalSemiconductor) modelThe IC of LM317 realizes, but is not limited.First end 121a (Anode) of three ends are adjustable voltage stabilizing element 121 is connected to second altogetherWith end COM2.Three ends are adjustable voltage stabilizing element 121 is in order to should be because of voltage division signal V1The first ginseng in the adjustable voltage stabilizing element 121 with three endsExamine voltage, such as 1.25 volts (V), automatically corresponding adjustment the first electric current I1Size of current, make the first isolation element 122Outlet side is according to output voltage VoChange output second feedback signal VFb2
In certain embodiments, for example, shown in Figure 10, second source circuit 11 also can be the circuit structure of resonant mode, and wrapsCircuit containing second switch 111, the first current rectifying and wave filtering circuit 112, the second current rectifying and wave filtering circuit 113, a resonance circuit 114 and transformationDevice TR.Transformator TR comprises armature winding Np, secondary windings NsAnd assists winding Na, wherein secondary windings NsTake out for central authoritiesHeader structure.Second switch circuit 111 is by a second switch element Q2And one the 3rd switch element Q3Realize, wherein second switchElement Q2And the 3rd switch element Q3Be connected in series in the input of second source circuit 11 and first altogether reference edge COM1 itBetween, and its control end receives the second pulse width modulating signal V respectivelyPWM2And carry out the switching of on or off.
In the present embodiment, resonance circuit 114 is connected between second switch circuit 111 and transformator TR, and can for butIt is not limited to by a resonant inductance LrAnd a resonant capacitance CrConstituted, wherein resonant inductance LrOne end be connected to second switchElement Q2And the 3rd switch element Q3Between, resonant inductance LrThe other end be connected to armature winding NpOne end, resonant capacitanceCrOne end be connected to the first altogether reference edge COM1, resonant capacitance CrThe other end be connected to armature winding NpThe other end, whenSo, in some embodiments, resonance circuit 114 also can be by resonant inductance Lr, resonant capacitance CrAnd the armature winding N of transformator TRpConstituted.By control unit 13b (that is, the second control circuit 16b in Fig. 1,2,5,6 or as first in Fig. 3,4,7,8Control circuit 13b1) the second pulse width modulating signal V of exportingPWM2Make second switch element Q2And the 3rd switch element Q3PointOther on or off, and by the resonance of resonance circuit 114, just can by input voltage (that is, busbar voltage Vbus) electric energy warpArmature winding N by transformator TRpIt is sent to secondary windings NsWith assists winding Na, more respectively by the first current rectifying and wave filtering circuit112 and the second current rectifying and wave filtering circuit 113 rectifying and wave-filtering to export output voltage VoWith the first boost voltage Vcc.
First current rectifying and wave filtering circuit 112 is connected to the secondary windings N of transformator TRsWith the circuit system 2 of electronic product itBetween, and comprise the first diode D1, the 3rd diode D3With the first electric capacity C1.Wherein first diode D1Anode tap and transformationThe secondary windings N of device TRsOne end connect, the first diode D1Cathode terminal be connected to the outfan of second source circuit 1111a, the 3rd diode D3Anode tap and transformator TR secondary windings NsThe other end connect, the 3rd diode D3Negative electrodeEnd is then connected to the first diode D1Cathode terminal and second source circuit outfan 11a, the first electric capacity C1One end be connected toFirst diode D1Cathode terminal, the 3rd diode D3Cathode terminal and second source circuit outfan 11a, the first electric capacity C1The other end be connected to secondary windings NsCenter tap end and second altogether reference edge COM2.The second rectification as the present embodimentThe structure of filter circuit 113 and annexation are similar in appearance to shown in Fig. 9, therefore similar to annexation with identical label representative structure,Repeat no more in this.It should be noted that total class of second source circuit 11 is various, illustrate two kinds of realities only for understanding hereinExisting mode, but other can not be limited with this and realize type.
Refer to Figure 11 A, it is the circuit structure signal of the first power circuit shown in Fig. 1-8 and the first feedback circuitFigure.As shown in Figure 11 A, the first power circuit 15 comprises first switch circuit 151, one the 3rd electric capacity C3, one the 4th electric capacity C4, oneFirst inductance L1, one second inductance L2, the 4th diode D4, the wherein the 3rd electric capacity C3One end be connected to the first power circuit 15Input, the 3rd electric capacity C3The other end be connected to the first altogether reference edge COM1, the first inductance L1One end be connected to the 3rd electricityHold C3One end, the 4th electric capacity C4One end and the first inductance L1The other end connect, the 4th electric capacity C4The other end be connected toReference edge COM1 altogether, and in the present embodiment, the 3rd electric capacity C3, the 4th electric capacity C4And the first inductance L1May make up a filtered electricalRoad.Second inductance L2One end and the first inductance L1The other end and the 4th electric capacity C4One end connect, the second inductance L2AnotherOne end of one end and first switch circuit 151 and the 4th diode D4Anode tap connect, the 4th diode D4Cathode terminal connectIn the outfan 15a of the first power circuit 15, the other end of first switch circuit 151 is connected to the first common reference edge COM1, andFirst switch circuit 151 can be realized by a switch element.
First feedback circuit 17b comprises one the 4th resistance R4, one the 5th resistance R5And one the 6th resistance R6, the wherein the 4th electricityResistance R4One end be connected to the outfan 15a, the 4th resistance R of the first power circuit 154The other end be connected to the 5th resistance R5'sOne end, the 5th resistance R5The other end be connected to the 6th resistance R6One end and the first feedback circuit 17b outfan, the 6th electricityResistance R6The other end be connected to the first altogether reference edge COM1, and the 4th resistance R4, the 5th resistance R5And the 6th resistance R6Constitute theTwo bleeder circuits, in order to by busbar voltage VbusCarry out partial pressure, with the 5th resistance R5And the 6th resistance R6Between, that is, in firstOutfan output the first feedback signal V of feedback circuit 17bFb1.
Certainly, the second inductance L2, first switch circuit 151 and the 4th diode D4Between annexation be not limited toShown in Figure 11 A, in certain embodiments, as shown in Figure 11 B, one end of first switch circuit 151 changes and is connected to the first inductance L1The other end, the other end of first switch circuit 151 is connected to the second inductance L2One end, the second inductance L2The other end connectIn the outfan 15a of the first power circuit 15, the 4th diode D4Cathode terminal be connected to the other end of first switch circuit 151With the second inductance L2One end between, the 4th diode D4Anode tap be connected to the first altogether reference edge COM1.Need explanationIt is that total class of the first power circuit 15 is various, list two kinds of embodiments only for understanding herein, but can not be limited with thisOther realize type.
Refer to Figure 12, it is the electrical block diagram of the testing circuit shown in Fig. 5-8.As shown in figure 12, detect electricityRoad 13b2 comprises a holding circuit 131, one second isolation element 132, a coupled switch 133, one the 7th resistance R7And oneFive electric capacity C5.Wherein holding circuit 131 is connected to the outfan 11a of second source circuit 11, the second altogether reference edge COM2 and theThe input side of two isolation elements 132, exports the second boost voltage V in order to receive the electric energy of second source circuit 11 outputb, andThere is provided to the input side of the second isolation element 132, and when power connector 1a is separated with the circuit system 2 of electronic product and exportsVoltage VoMagnitude of voltage continuous decrease be less than load voltage value when, holding circuit 131 can maintain the second boost voltage VbVoltage electricityPut down more than a predetermined value, when the circuit system 2 of out-put supply adapter 1a and electronic product is again coupled to, holding circuit131 the second boost voltage V that enough magnitudes of voltage can be providedbTo the input side of the second isolation element 132, power supply status are thereby made to examineSurvey signal VaCorrespondence changes into the operating state of zero potential or electronegative potential.
In the present embodiment, holding circuit 131 comprises the 5th diode D5With the 6th electric capacity C6, wherein, the 6th electric capacity C6'sOne end reference edge COM2 common with second is connected, the 6th electric capacity C6The other end and the 5th diode D5Cathode terminal connect, and the 5thDiode D5Anode tap be connected with the outfan 11a of second source circuit 11.The power output end of holding circuit 131 is the 5thDiode D5Cathode terminal, be connected to the input side of the second isolation element 132.
Second isolation element 132 can by but be not limited to be made up of optical coupling isolation element, the second isolation element 132 defeatedGo out the outfan that side is connected to testing circuit 13b2, and the input side of the second isolation element 132 and holding circuit 131 and the 7th electricityResistance R7One end connect, the 7th resistance R7The other end be connected with one end of coupled switch 133 and formed and be connected in series, the 7th electricityResistance R7It is connected in series with the input side of the second isolation element 132, flow into the second of the second isolation element 132 input side in order to limitElectric current I2Size of current.Due to the 7th resistance R7Input side with the second isolation element 132 is to be connected in series just to reach limitMake the second electric current I2Size of current effect, therefore in certain embodiments, the 7th resistance R7With the second isolation element 132The priority position that input side is connected in series can exchange, contrary with shown in Figure 12 (not shown).The other end of coupled switch 133 withSecond reference edge COM2 connection altogether, coupled switch 133 is in order to the annexation according to out-put supply adapter 1a and circuit system 2And correspond on or off, the 5th electric capacity C5It is connected between the outfan of testing circuit 13b2 and the first common reference edge COM1.
In the present embodiment, when out-put supply adapter 1a is connected by user with the circuit system 2 of electronic product, thisWhen, coupled switch 133 accordingly switches to conducting state, therefore makes the second electricity of the input side of inflow the second isolation element 132Stream I2Be not zero current value, and correspondence makes power state detection signal VaOperating state for zero potential or electronegative potential.On the contrary, working asWhen out-put supply adapter 1a is separated by user with the circuit system 2 of electronic product, coupled switch 133 accordingly switches to and cutsOnly state, leads to the second electric current I2For zero current value, corresponding to makes power state detection signal VaFor the closed mode of high potential, thisWhen holding circuit 131 maintain the second boost voltage VbVoltage level in predetermined value.Therefore when out-put supply is connected by userWhen the circuit system 2 of device 1a and electronic product is again coupled to, holding circuit 131 can provide the second of enough magnitudes of voltage to assist electricityPressure VbTo the input side of the second isolation element 132, thereby make power state detection signal VaAccordingly quickly change into zero potential orThe operating state of electronegative potential.
In above-mentioned multiple embodiments, first control circuit 13b1 and second control circuit 16b can be but be not limited toPulse-width modulator (pulse width modulation controller, PWMcontroller), pulse frequency modulatedDevice (pulse frequency modulation controller, PFM controller) or digital signal processor(digital signal processor,DSP).The switch element of the present invention can be but be not limited to bipolar junction transistor(Bipolar JunctionTransistor, BJT) or metal-oxide half field effect transistor (Metal-Oxide-SemiconductorField-Effect Transistor,MOSFET).
In sum, the exchange type power conversion circuit of the present invention has work(not only through having stage type circuit frameworkThe function of rate factor correcting, and can not need provide electric energy to load or electronic product circuit system when, for example load orWhen electronic product decommissions, can be stopped by the control circuit that the start-up circuit of feedback circuit and control unit makes control unitRunning, and then so that exchange type power conversion circuit is decommissioned.The testing circuit of more available control unit is according to electronic productPower supply status output power state detection signal, so that the output voltage of exchange type power conversion circuit is not persistently maintainedLoad voltage value.Therefore, integrated circuit has relatively low power consumption, and without by input voltage be adjusted to zero voltage value or inDisconnected, the exchange type power conversion circuit of the present invention will decommission, to meet energy saving characteristic.Additionally, the friendship of the present inventionThe formula power-switching circuit of changing can be applicable to power supply unit and provides electric energy to the circuit system of electronic product, and can be in userWhen not using electronic product, so that power supply unit is decommissioned, therefore power supply unit need not be removed by socket and interrupt defeatedEnter voltage, you can so that power supply unit decommissions, and there is relatively low power consumption.
The present invention be appointed by those skilled in the art apply craftsman think and be all as modify, so without departure from such as attached patentingSharp claimed range scope of the claimed.