Summary of the invention
For the above-mentioned problems in the prior art, a kind of loop compensation circuit is now provided.
Specific technical solution is as follows:
The present invention includes a kind of loop compensation circuit, including:
One is provided with the operating circuit of energy-storage travelling wave tube；
One switching device group is connected between the input terminal and ground terminal of the operating circuit, for controlling the energy storageElement replaces switching between charge mode and discharge mode；
One drive control unit, the input terminal of the drive control unit connect the output end of the operating circuit, are used forA PWM is generated under the action of the voltage signal and switch-over control signal that sample the output end from the operating circuit according to one(modulation of pulse width modulation pulse width) driving signal；
At least one compensating unit is connected to the defeated of the output end of the drive control unit and the operating circuitBetween outlet, for being superimposed on a voltage feedback signal according to a current sampling signal of the sampling from the operating circuitEffect is lower to generate loop compensation signal, to improve the stability of output voltage.
Preferably, the operating circuit includes:
One charge control branch is connected to an output end and one and crosses between node；
One charge and discharge branch is connected to described cross between node and the input terminal；
One control of discharge branch is connected to described cross between node and ground terminal；
One energy-storage travelling wave tube is series at the charge and discharge branch road；
The operating circuit is when charge mode, and the charge control branch and charge and discharge branch conducting are described to putElectric control branch disconnects, and the electric current of the input terminal input charges to the energy-storage travelling wave tube；
The operating circuit is when discharge mode, and the control of discharge branch and charge and discharge branch conducting are described to fillElectric control branch disconnects, and the energy-storage travelling wave tube discharges to the output end.
Preferably, the drive control unit includes:
One driving unit, the input terminal of the driving unit connect the output end of the operating circuit；
One control unit, the input terminal of described control unit connect the output end of the driving unit；
One processing unit, the output end of the input terminal connection described control unit of the processing unit.
Preferably, the processing unit includes:
The normal phase input end of one comparator, the comparator connects the ground terminal, institute by a first voltage reference sourceThe negative-phase input for stating comparator connects the output end by a first capacitor, and the output end of the comparator connects the controlThe output end of unit processed generates a comparison signal for being compared to a reference voltage with the voltage feedback signal；
One first resistor is connected between the negative-phase input of the comparator and the output end；
One second resistance is connected between the negative-phase input of the comparator and a divider node；
One 3rd resistor is connected between the divider node and the ground terminal.
Preferably, the voltage feedback signal is generated by a feedback network, and the feedback network is by electric resistance partial pressure electricityRoad is formed, and the resistor voltage divider circuit includes the second resistance and the 3rd resistor, the second resistance and the thirdThe point being connected between resistance forms the divider node, and the voltage feedback signal is drawn from the divider node.
Preferably, the switching device group includes:
One first switch tube, the grid of the first switch tube are connected to the first input end of the drive control unit,The source electrode of the first switch tube connects the output end, and cross node described in the drain electrode connection of the first switch tube；
One second switch, the grid of the second switch connect the second input terminal of the drive control unit, instituteThe source electrode for stating second switch connects the ground terminal, and cross node described in the drain electrode connection of the second switch.
Preferably, institute's energy-storage travelling wave tube is an inductance.
Preferably, at least one described compensating unit includes:
One current sensor is connected between the divider node and the node that crosses；
One first error amplifier, the normal phase input end of the first error amplifier connects a temperature controller, describedThe negative-phase input of first error amplifier connects the ground terminal, the first error amplification by a second voltage reference sourceThe output end of device connects the input terminal of the current sensor；
One second error amplifier, the normal phase input end of two error amplifier connects other any components, describedThe negative-phase input of two error amplifiers connects the ground terminal by a tertiary voltage reference source, two error amplifierOutput end connects the input terminal of the current sensor.
The beneficial effect of technical solution of the present invention is: a kind of loop compensation circuit is provided, it is single at least one compensationIn member, according to a current sampling signal of the sampling from operating circuit, it is superimposed under the action of voltage feedback signal and generates loopThermal compensation signal provides the feedback control of the conditions such as temperature control, input limited-voltage control, so that traditional constant on-time modeSystem is still able to maintain steady operation under harsh environment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all itsHis embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phaseMutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
The present invention provides a kind of loop compensation circuit, wherein includes:
One is provided with the operating circuit 1 of energy-storage travelling wave tube；
One switching device group is connected between the input terminal of operating circuit 1 and ground terminal GND, for controlling energy-storage travelling wave tubeReplace switching between charge mode and discharge mode；
One drive control unit 2, the output end of the input terminal connection operating circuit 1 of drive control unit 2, for according to oneA PWM drive signal is generated under the action of the voltage signal and switch-over control signal of output end of the sampling from operating circuit 1；
At least one compensating unit 3 is connected to the output end of drive control unit 2 and the output end of operating circuit 1Between, for being superimposed under the action of a voltage feedback signal and producing according to a current sampling signal of the sampling from operating circuit 1Raw loop compensation signal, to improve the stability of output voltage.
By the loop compensation circuit of above-mentioned offer, as shown in Figure 1, coming from work according to sampling in drive control unit 2Make to generate PWM drive signal under the action of the voltage signal and switch-over control signal of the output of circuit 1, then by drive control unit 2The voltage feedback signal of middle extraction is transmitted to compensating unit 3.
Further, the current sampling signal from operating circuit 1 is overlapped by compensating unit 3 with voltage feedback signalLoop compensation circuit is generated, to adjust output voltage.For example, after the voltage for detecting input terminal reduces, it can be single by compensationThe loop compensation signal generated in member 3 is to reduce output voltage, so that the reduction of input voltage is compensated for, so that traditional is constantTurn-on time modular system is still able to maintain steady operation under harsh environment.
In addition, the waveform for the electric current that the energy-storage travelling wave tube in operating circuit 1 exports is inductor current signal, abscissaFor time T (ms), ordinate is inductive current I (A) (as shown in Figure 2)；The driving voltage exported from drive control unit 2Waveform is driving signal, and abscissa is time T (ms), and ordinate is driving voltage V (v) (as shown in Figure 3)；From output endOutput voltage Vout (v) waveform be output voltage signal, abscissa be time T (ms), ordinate be output voltage V(v) (as shown in Figure 4)；As shown in figure 5, the waveform be drive control unit 2 in reference voltage fb1, reference voltage fb1 due toThere is magnitude of current superposition, so reference voltage value has the feedback quantity of superimposed current amount, forms feedback voltage fb2, and the feedback of electric currentMeasure response quickly.
Further, the waveform of the acquisition electric current exported from operating circuit 1 is ramping current signal, that is, above-mentionedCurrent sampling signal, abscissa are time T (ms), and ordinate is acquisition electric current I (A), and acquisition electric current is added to and feeds back electricityAfter pressing on fb2, ramp voltage is formed, so that compensation loop is stablized, corresponding speed is enough quickly.(as shown in Figure 6)
In a kind of preferably case study on implementation, as shown in Figure 1, operating circuit 1 includes:
One charge control branch is connected to an output end and one and crosses between node；
One charge and discharge branch, is connected to and crosses between node and input terminal；
One control of discharge branch, is connected to and crosses between node and ground terminal GND；
One energy-storage travelling wave tube is series at charge and discharge branch road；
When charge mode, charge control branch and the conducting of charge and discharge branch, control of discharge branch disconnects operating circuit, defeatedThe electric current for entering end input charges to energy-storage travelling wave tube；
When discharge mode, control of discharge branch and the conducting of charge and discharge branch, charge control branch disconnect operating circuit, storageEnergy element discharges to output end.
In a kind of preferably case study on implementation, drive control unit 2 includes:
One driving unit 20, the output end of the input terminal connection operating circuit 1 of driving unit 20；
One control unit 21, the output end of the input terminal connection driving unit 20 of control unit 21；
One processing unit 22, the output end of the input terminal connection control unit 21 of processing unit 22.
Processing unit 22 includes:
The normal phase input end of one comparator CMP, comparator CMP pass through a first voltage reference source V0 connection ground terminal GND,The negative-phase input of comparator CMP connects control by the output end of first capacitor C0 connection an output end OUT, comparator CMPThe output end of unit 21 generates a comparison signal for being compared to a reference voltage with voltage feedback signal；
One first resistor R0, is connected between the negative-phase input of comparator CMP and output end OUT；
One second resistance R1, is connected between the negative-phase input of comparator CMP and a divider node；
One 3rd resistor R2, is connected between divider node and ground terminal GND.
Specifically, as shown in Figure 1, transmitting the power amplification that driving pulse exports operating circuit 1 by driving unit 20,Voltage signal to guarantee the output of operating circuit 1 is reliable and stable, then the stream of entire circuit system is controlled by control unit 21Cheng Shunxu.
Further, processing unit 22 includes comparator CMP, by comparator CMP by the reference voltage of outer voltageVout is input to the negative-phase input of comparator CMP and is compared with the voltage Vref of the normal phase input end of comparator CMP, generatesComparison signal.
Further, an equivalent series resistance system is formed by first resistor R0, second resistance R1 and 3rd resistor R2It unites, extraction voltage feedback signal at the divider node between second resistance R1 and 3rd resistor R3.
In a kind of preferably case study on implementation, voltage feedback signal is generated by a feedback network, and feedback network is by an electricityResistance bleeder circuit is formed, and resistor voltage divider circuit includes second resistance R1 and 3rd resistor R2, second resistance R1 and 3rd resistor R2Between the dot that is connected drawn at divider node, voltage feedback signal from divider node.
Specifically, voltage feedback signal is generated by a feedback network, and feedback network is formed by a resistor voltage divider circuit, electricityHindering bleeder circuit includes second resistance R1 and 3rd resistor R2, and for the dot being connected between two resistance at divider node, voltage is anti-Divider node of the feedback signal between second resistance R1 and 3rd resistor R2 is drawn, and the electric current from operating circuit 1 is adoptedSample signal, is superimposed upon in voltage feedback signal, to generate loop compensation signal.
In a kind of preferably case study on implementation, switching device group includes:
One first switch tube M0, the grid of first switch tube M0 are connected to the first input end of drive control unit 2, and firstThe source electrode of switching tube M0 connects output end OUT, and the drain electrode of first switch tube M0 connects the node that crosses；
Second input terminal of the grid connection drive control unit 2 of one second switch M1, second switch M1, second opensThe source electrode for closing pipe M1 connects ground terminal GND, and the drain electrode of second switch M1 connects the node that crosses.
Specifically, as shown in Figure 1, first switch tube M0 is series at charge control branch road, second switch M1 is series atControl of discharge branch road, first switch tube M0 and second switch M1 are metal-oxide-semiconductor, and first switch tube M0 and second switch M1 existOperating circuit 1, which is controlled in, under PWM drive signal effect replaces switching between charge mode and discharge mode.
In a kind of preferably case study on implementation, energy-storage travelling wave tube is an inductance L.
In a kind of preferably case study on implementation, at least one compensating unit 3 includes:
One current sensor 30 is connected to divider node between the node that crosses, to detect current sampling signal andVoltage feedback signal；
Normal phase input end one temperature controller of connection of one first error amplifier I1, first error amplifier I1, firstThe negative-phase input of error amplifier I1 passes through second voltage reference source V1 a connection ground terminal GND, first error amplifier I1Output end connection current sensor 30 input terminal, to adjust output voltage；
The normal phase input end of one second error amplifier I2, the second error amplifier I2 connects other any components, theThe negative-phase input of two error amplifier I2 passes through a tertiary voltage reference source V2 connection ground terminal GND, the second error amplifierThe input terminal of the output end connection current sensor 30 of I2, to compensate input voltage.
Specifically, as shown in Figure 1, current sensor 30 be a kind of detection device, the current sampling signal that will test out andVoltage feedback signal is converted into loop compensation signal.
Further, the normal phase input end of first error amplifier I1 connects temperature controller, for example, when circuit system is sent outRaw excess temperature, then adjustable output voltage reduces, to adjust output power reduction, so that temperature is reduced, so that temperature control loopsIt is maintained at stable state.
Further, the normal phase input end of the second error amplifier I2 connects other any components, when the second error is putThe normal phase input end of big device I2 receives an other electric signal, for example, detecting input terminal IN's by current sensor 30After voltage reduces, then it can adjust what output voltage reduced to reach the voltage of compensation input terminal IN by the second error amplifier I2Purpose, so that entire circuit system remains at sufficiently stable state.
In a kind of preferably case study on implementation, loop compensation circuit further includes one the 4th resistance ESR and the second capacitor COUTSeries connection, is connected between output end OUT and ground terminal GND.
In a kind of preferably case study on implementation, loop compensation circuit further includes one the 5th resistance RLOAD, is connected to output endBetween OUT and ground terminal GND.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection modelIt encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic contentEquivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.