A kind of LED lamp circuit with Delayed extinguishing functionTechnical field
The present invention relates to a kind of LED lamp circuits, more particularly, to a kind of LED lamp circuit with Delayed extinguishing function.
Background technique
LED light has been widely used in illuminating industry as a kind of energy-efficient product.The performance of LED light directly takesCertainly in its core circuit --- the performance of LED lamp circuit.
The structural block diagram of existing LED lamp circuit is as shown in Figure 1, generally include current rectifying and wave filtering circuit, constant-current control circuitWith LED illuminating circuit.Current rectifying and wave filtering circuit has firewire input terminal, zero curve input, output end and ground terminal, current constant control electricityRoad has voltage input end, ground terminal, positive output end and negative output terminal, and LED illuminating circuit has anode and cathode, rectifying and wave-filteringThe firewire input terminal of circuit and the firewire of alternating current connect, and the zero curve input terminal of current rectifying and wave filtering circuit and the zero curve of alternating current connect, wholeThe voltage input end of the output end and constant-current control circuit that flow filter circuit connects, the positive output end and LED of constant-current control circuitThe anode connection of illuminating circuit, the negative output terminal of constant-current control circuit are connect with the cathode of LED illuminating circuit, current rectifying and wave filtering circuitGround terminal connected with the ground terminal of constant-current control circuit.
When LED lamp circuit is electrically connected with city, current rectifying and wave filtering circuit the alternating voltage of alternating current be converted to fluctuation it is lesserDC voltage, at this point, the output end of current rectifying and wave filtering circuit exports DC voltage, constant-current control circuit exports current rectifying and wave filtering circuitDC voltage converted, at this time between the positive output end and negative output terminal of constant-current control circuit export constant size electric currentFor the power supply of LED illuminating circuit, there is electric current to pass through in LED illuminating circuit, LED illuminating circuit shines, when LED lamp circuit and alternating currentWhen connection disconnects, for LED lamp circuit due to not having electric energy, the electric current for flowing through LED illuminating circuit is that zero, LED illuminating circuit does not shine.
It when above-mentioned LED lamp circuit is applied in LED light, is connect by power switch with mains supply, when power switch willWhen alternating current is connected to LED lamp circuit, there is electric current to flow through on LED illuminating circuit, LED illuminating circuit shines, when the power switch willWhen alternating current and LED illuminating circuit disconnect, there is no electric current to flow through on LED illuminating circuit, LED illuminating circuit does not shine.Due to the electricitySource switch is fixedly mounted at a certain position, and when closing LED light, user needs to go to manual operation power supply at power switch and opensIt closes come after powering off, LED light is extinguished at once after power-off, ambient brightness rapid drawdown, but user will also be from the peace of power switchIt is left at holding position, brings many inconvenience to the action of user like that.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of LED lamp circuit with Delayed extinguishing function, LED light electricityRoad will not extinguish at once after a loss of power, convenient for the action of user.
The technical scheme of the invention to solve the technical problem is: a kind of LED light electricity with Delayed extinguishing functionRoad, including LED illuminating circuit, the LED illuminating circuit have anode and cathode, further include rectification circuit, filter circuit, touchingConversion circuit, delay control circuit and constant-current control circuit are sent out, there is the rectification circuit firewire input terminal, zero curve to inputEnd, output and ground, the filter circuit have input, output end and ground terminal, the triggering conversion circuitWith anode, input, output end and ground terminal, the delay control circuit has anode, ground terminal, triggering end and outputEnd, the current constant control electric current have the first control terminal, the second control terminal, output and ground, the rectification circuitFirewire input terminal be used to connect the firewire of alternating current, the zero curve input terminal of the rectification circuit is used to connect the zero curve of alternating current,The output end of the rectification circuit, the input terminal of the filter circuit, the input terminal of the triggering conversion circuit and instituteFirst control terminal of the constant-current control circuit stated connects, the output end of the filter circuit, the triggering conversion circuitThe anode connection of the anode of positive, described delay control circuit and the LED illuminating circuit, the triggering conversion circuitOutput end connected with the triggering end of the delay control circuit, the output end of the delay control circuit and the perseveranceThe second control terminal connection of flow control circuit, the output end of the constant-current control circuit and the LED illuminating circuit are bornPole connection, the ground connection of the ground terminal of the rectification circuit, the ground terminal of the triggering conversion circuit, the filter circuitIt holds, the ground terminal of the delay control circuit is connected with the ground terminal of the constant-current control circuit；The current constant controlCircuit has normal mode of operation and delay working mode, and running current is preset in the constant-current control circuit and is prolongedWhen operating current, the delay working electric current is less than the running current, presets in the delay control circuitThere is delay time, when the voltage signal that the first control terminal of the constant-current control circuit accesses is from the low electricity for being kept for 5 seconds or moreFlat when becoming high level, the constant-current control circuit enters normal mode of operation, the output end of the constant-current control circuitRunning current is exported, and the output end of the constant-current control circuit is not by the input signal of its second control terminal accessIt influences, the LED illuminating circuit issues the light being adapted with running current, is in the constant-current control circuitWhen normal mode of operation, when the voltage signal that the first control terminal of the constant-current control circuit accesses is from high level to low electricityIt is flat, then from low level to high level and when a low level pulse signal of the time less than 3 seconds, the triggering conversion circuitInput terminal has received the low level pulse signal, and generates trigger signal output, the current constant control electricity in its output endRoad also enters delay working mode simultaneously, and the output end of the constant-current control circuit is controlled by the constant-current control circuitThe triggering end of the input signal of second control terminal access, the delay control circuit is receiving the triggering conversion circuitAfter the trigger signal of output, delay is generated in its output end and is turned on light control that signal is sent to the constant-current control circuit secondControl terminal, the output end of the constant-current control circuit exports the operating current of turning on light that is delayed, the LED illuminating circuit hair at this timeThe light that operating current of turning on light out with delay is adapted, when the delay control circuit does not have again within preset delay timeSecondary to receive trigger signal, at the end of delay time, the output end output delay of the delay control circuit, which is turned off the light, controls letterNumber, the output end shutdown of the constant-current control circuit, no current output, the LED illuminating circuit no longer shines, when describedConstant-current control circuit when being in delay working mode, no matter Suo Shu LED illuminating circuit is in luminance or not send outLight state, as long as being inputted from high level to low level in first control terminal of constant-current control circuit, then from low level to heightThe low level pulse signal of level and time less than 3 seconds, the constant-current control circuit will be again introduced into normal work mouldFormula.
The triggering conversion circuit includes first resistor, second resistance, 3rd resistor, first capacitor and the first integrated electricityRoad chip, the model HL2711A of first IC chip, one end of the first resistor are the triggeringThe input terminal of conversion circuit, the other end of the first resistor, one end of the second resistance, the first capacitorOne end is connected with the 4th foot of first IC chip, the 1st foot and the 2nd foot of first IC chipConnection, one end of the 3rd resistor are the anode of the triggering conversion circuit, the other end of 3rd resistor and described3rd foot of the first IC chip connects, and the 8th foot of first IC chip is the triggering conversion circuitOutput end, the other end and first ic core of the other end of the second resistance, the first capacitor5th foot of piece connects and its connecting pin is the ground terminal of the triggering conversion circuit.The output end of the circuit has high pressure resistantCharacteristic, with delay control circuit cooperate, cost can be reduced.
The delay control circuit include the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the second capacitor andFirst diode, second capacitor is electrolytic capacitor, and the first diode is zener diode, the 4th electricityOne end of resistance is the anode of the delay control circuit, the one of the other end of the 4th resistance and the 5th resistanceEnd connection, the other end of the 5th resistance is connected with one end of the 6th resistance and its connecting pin is the delayThe triggering end of control circuit, the anode connection of the other end and second capacitor of the 6th resistance, described secondThe cathode of capacitor, the first diode cathode connected with one end of the 7th resistance and its connecting pin be it is describedThe anode of the output end of delay control circuit, the first diode is connected with the other end of the 7th resistance and it connectsConnect the ground terminal that end is the delay control circuit.The circuit realizes that cost is relatively low using RC circuit structure.
The filter circuit includes the second diode and third capacitor, and the third capacitor is electrolytic capacitor, describedThe second diode the just extremely described filter circuit input terminal, the cathode of second diode and the thirdThe anode of capacitor connects and its connecting pin is the output end of the filter circuit, and the cathode of the third capacitor is describedThe ground terminal of filter circuit.
The constant-current control circuit includes NMOS tube, the 8th resistance, the 9th resistance, the tenth resistance, the 4th capacitor, the 5thCapacitor and the second IC chip, the model SM2212E of second IC chip, the 8th resistanceOne end is the first control terminal of the constant-current control circuit, the other end of the 8th resistance and the described second integrated electricity8th foot of road chip connects, and the 5th foot of second IC chip and the connection of the 6th foot and its connecting pin are described4th foot of the output end of constant-current control circuit, second IC chip is connected with one end of the 9th resistance,The other end of 9th resistance is connected with the drain electrode of the NMOS tube, and the grid of the NMOS tube is the constant current3rd foot of the second control terminal of control circuit, second IC chip is connected with one end of the tenth resistance,1st foot of second IC chip is connected with one end of the 4th capacitor, second ic core2nd foot of piece is connected with one end of the 5th capacitor, the bottom electrode of second IC chip, describedThe source electrode of NMOS tube, the other end of the tenth resistance, the other end of the 4th capacitor and the 5th capacitorOther end connection and its connecting pin are the ground terminal of the current constant control electric current.The second of constant-current control circuit use is integratedCircuit chip is a kind of general two sections of light modulation linear constant current IC chips of switch, by the low pulse for being input to the 8th footSignal can be such that the second IC chip converts between two kinds of working conditions of delay working mode and normal mode of operation,Output electric current in normal mode of operation can facilitate setting LED light normal by the resistance value adjusting of the tenth resistance of changeOutput size of current when illuminating state, output end current when delay working mode by changing the resistance value of the 9th resistance,Output size of current when delay illuminating state is adjusted, the on and off state of control NMOS tube is passed through, so that it may control theThe turn-on and turn-off state of one IC chip output end in delay working mode, the constant-current control circuit are a kind of controllableLinear constant current electric current export structure, circuit is simple, and cost is relatively low.
The rectification circuit realizes that the 1st foot of the full bridge rectifier bridge heap is described using full bridge rectifier bridge heapThe firewire input terminal of rectification circuit, the 3rd foot of the full bridge rectifier bridge heap are the zero curve input terminal of the rectification circuit, institute2nd foot of the full bridge rectifier bridge heap stated is the output end of the rectification circuit, and the 4th foot of the full bridge rectifier bridge heap is instituteThe ground terminal for the rectification circuit stated.
The LED illuminating circuit is formed by several LED luminescence unit parallel connections, each LED luminescence unit pointIt is not connected and is formed by several LED light emitting diodes, the positive parallel connected end of the LED luminescence unit described in several is describedThe anode of LED illuminating circuit, the cathode parallel connected end of the LED luminescence unit described in several are the negative of the LED illuminating circuitPole.
Compared with the prior art, the advantages of the present invention are as follows pass through rectification circuit, filter circuit, triggering conversion circuit, prolongWhen control circuit, constant-current control circuit and LED illuminating circuit construct LED lamp circuit, constant-current control circuit, which has, works normally mouldFormula and delay working mode are preset with running current and delay working electric current, delay working electric current in constant-current control circuitLess than running current, delay time is preset in delay control circuit, when LED lamp circuit and city are electrically disconnected, LED lamp circuitMiddle no current passes through, and the voltage signal of the first control terminal access of constant-current control circuit is low level, when LED lamp circuit and alternating currentWhen reconnecting after disconnection 5 seconds or more, the voltage signal of the first control terminal access of constant-current control circuit will be from holding 5 seconds or moreLow level becomes high level, regards as turning on light at this time, and constant-current control circuit enters normal mode of operation, constant-current control circuit it is defeatedOutlet exports running current, and the output end of constant-current control circuit is not by the shadow of the input signal of its second control terminal accessIt rings, LED illuminating circuit issues the light being adapted with running current, when constant-current control circuit is in normal mode of operationWhen, LED lamp circuit and alternating current enter off-state from connection status and enter back into connection status (process can pass through continuous operationPower switch is realized) time less than 3 seconds when, i.e. the voltage signal of the first control terminal access of constant-current control circuit is from heightLevel is to low level, then from low level to high level and when a low level pulse signal of the time less than 3 seconds, triggering conversion electricityThe input terminal on road has received the low level pulse signal, and generates trigger signal output in its output end, regards as closing at this timeLamp, constant-current control circuit enter delay working mode, and the output end of constant-current control circuit is controlled by the second of constant-current control circuitThe input signal of control terminal access, the triggering end of delay control circuit is in the trigger signal for receiving triggering conversion circuit outputAfterwards, it first generates delay in its output end and turns on light and control the second control terminal that signal is sent to constant-current control circuit, at this time constant current controlThe output end output delay of circuit processed is turned on light operating current, and LED illuminating circuit, which is issued, turns on light what operating current was adapted with delayLight at the end of delay time, prolongs when delay control circuit is not received again by trigger signal within preset delay timeWhen control circuit output end generate delay and turn off the light and control signal output, the output end shutdown of constant-current control circuit, no current is defeatedOut, LED illuminating circuit no longer shines, and the delay-action of LED light is realized, when the constant-current control circuit is in delay working mouldWhen formula, no matter Suo Shu LED illuminating circuit is in luminance or non-light emitting state, as long as in the current constant control electricityThe first control terminal of road is inputted from high level to low level, then from low level to high level and a low level of the time less than 3 secondsPulse signal, the constant-current control circuit will be again introduced into normal mode of operation, and thus LED lamp circuit of the invention has and prolongsWhen turn off the light function, will not extinguish at once after a loss of power, convenient for the action of user, and can have making for traditional LED lamp circuitUse function.
Detailed description of the invention
Fig. 1 is the structural block diagram of existing LED lamp circuit；
Fig. 2 is the structural block diagram of the LED lamp circuit of the invention with Delayed extinguishing function；
Fig. 3 is the circuit diagram of the LED lamp circuit of the invention with Delayed extinguishing function.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment one: as shown in Fig. 2, a kind of LED lamp circuit with Delayed extinguishing function, including LED illuminating circuit, LEDIlluminating circuit has anode and cathode, further includes rectification circuit, filter circuit, triggering conversion circuit, delay control circuit and perseveranceFlow control circuit, rectification circuit have firewire input terminal, zero curve input, output end and ground terminal, and filter circuit has inputThere is anode, input, output end and ground terminal, delay control circuit to have for end, output and ground, triggering conversion circuitAnode, ground terminal, triggering end and output end, current constant control electric current have the first control terminal, the second control terminal, output end and ground connectionEnd, the firewire input terminal of rectification circuit are used to connect the firewire of alternating current, and the zero curve input terminal of rectification circuit is for connecting alternating currentZero curve, the output end of rectification circuit, filter circuit input terminal, trigger conversion circuit input terminal and constant-current control circuit theThe connection of one control terminal, the output end of filter circuit, the anode for triggering conversion circuit, the anode of delay control circuit and LED shineThe anode connection of circuit, the output end for triggering conversion circuit are connected with the triggering end of delay control circuit, delay control circuitOutput end is connected with the second control terminal of constant-current control circuit, the output end of constant-current control circuit and the cathode of LED illuminating circuitConnection, the ground terminal of rectification circuit, the triggering ground terminal of conversion circuit, the ground terminal of filter circuit, delay control circuit connectGround terminal is connected with the ground terminal of constant-current control circuit；Constant-current control circuit has normal mode of operation and delay working mode, permanentRunning current and delay working electric current are preset in flow control circuit, delay working electric current is less than running current, prolongsWhen control circuit in be preset with delay time, when constant-current control circuit the first control terminal access voltage signal from keep 5 secondsWhen above low level becomes high level, constant-current control circuit enters normal mode of operation, and the output end of constant-current control circuit is defeatedRunning current out, and the output end of constant-current control circuit is not influenced by the input signal that its second control terminal accesses, LEDIlluminating circuit issues the light being adapted with running current and works as perseverance when constant-current control circuit is in normal mode of operationFlow control circuit the first control terminal access voltage signal be from high level to low level, then from low level to high level and whenBetween a low level pulse signal less than 3 seconds when, the input terminal for triggering conversion circuit has received the low level pulse signal,And trigger signal output is generated in its output end, constant-current control circuit enters delay working mode, the output of constant-current control circuitEnd is controlled by the input signal of the second control terminal access of constant-current control circuit, and the triggering end of delay control circuit is receiving touchingAfter the trigger signal for sending out conversion circuit output, generates delay in its output end and turn on light and control signal and be sent to constant-current control circuitSecond control terminal, the output end of constant-current control circuit exports the operating current of turning on light that is delayed at this time, and LED illuminating circuit issues and delayThe adaptable light of operating current of turning on light, when delay control circuit is not received again by triggering letter within preset delay timeNumber, at the end of delay time, the output delay of the output end of delay control circuit, which is turned off the light, controls signal, constant-current control circuit it is defeatedOutlet shutdown, no current output, LED illuminating circuit no longer shines, when constant-current control circuit is in delay working mode, no matterLED illuminating circuit is in luminance or non-light emitting state, as long as inputting in the first control terminal of constant-current control circuit from heightLevel is to low level, then from low level to high level and a low level pulse signal of the time less than 3 seconds, constant-current control circuitNormal mode of operation will be again introduced into.
The working principle of LED lamp circuit with Delayed extinguishing function of the invention are as follows: LED lamp circuit is passed through into power switchIt is electrically connected with city, two kinds of work of constant-current control circuit in LED lamp circuit are realized in the disconnection and closure switched by operation powerThe switching of mode.When user's lamp, if current power switch is in closed state, illustrate at current constant-current control circuitIt in delay working state, first disconnects reclose power switch (operating time is less than 3 seconds) at this time, if current power switch is inOff-state then shows that LED lamp circuit using normal light-off mode, does not use Delayed extinguishing mode, power switch is directly closedClose, when LED lamp circuit enters use state from non-working condition, at this time constant-current control circuit the first control terminal access voltageSignal becomes high level from holding 5 seconds or more low levels, and constant-current control circuit enters normal mode of operation, constant-current control circuitOutput end export running current, and the output end of constant-current control circuit not by its second control terminal access input signalInfluence, LED illuminating circuit issue with running current be adapted light, constant-current control circuit be in work normally mouldWhen formula, when user will turn off the light, if not selecting Delayed extinguishing, directly power switch is disconnected, if selection delayIt turns off the light, then first disconnects and reclose power switch (operating time is less than 3 seconds), at this time the first control terminal access of constant-current control circuitVoltage signal be from high level to low level, then from low level to high level and the time is less than 3 seconds low level pulsesWhen signal, the input terminal for triggering conversion circuit has received the low level pulse signal, and generates trigger signal in its output endOutput regards as delay at this time and turns off the light, and constant-current control circuit enters delay working mode, and the output end of constant-current control circuit is controlledTriggering conversion is being received in the triggering end of the input signal that the second control terminal of constant-current control circuit accesses, delay control circuitAfter the trigger signal of circuit output, delay is first generated in its output end and is turned on light control that signal is sent to constant-current control circuit secondControl terminal, the output end of constant-current control circuit exports the operating current of turning on light that is delayed at this time, and the sending of LED illuminating circuit is turned on light with delayThe adaptable light of operating current, when delay control circuit is not received again by trigger signal within preset delay time,At the end of delay time, the output end of delay control circuit, which generates delay, turns off the light and controls signal output, constant-current control circuit it is defeatedOutlet shutdown, no current output, LED illuminating circuit no longer shine, and the delay-action of LED light are realized, if delay control circuitIt is received again by trigger signal within preset delay time, when restarting delay meter, when constant-current control circuit is in delayWhen operating mode, no matter LED illuminating circuit is in luminance or non-light emitting state, as long as in constant-current control circuit firstControl terminal input from high level to low level, then from low level to high level and the time less than 3 seconds a low level pulse letterNumber, constant-current control circuit will be again introduced into normal mode of operation.
Embodiment two: the present embodiment is basically the same as the first embodiment, and difference is as described below:
As shown in figure 3, triggering conversion circuit includes first resistor R1, second resistance R2,3rd resistor in the present embodimentR3, first capacitor C1 and the first IC chip U1, the model HL2711A of the first IC chip U1, first resistorOne end of R1 is the input terminal for triggering conversion circuit, the other end of first resistor R1, one end of second resistance R2, first capacitor C1One end connected with the 4th foot of the first IC chip U1, the 1st foot of the first IC chip U1 and the connection of the 2nd foot, theOne end of three resistance R3 is the anode for triggering conversion circuit, the of the other end of 3rd resistor R3 and the first IC chip U1The connection of 3 feet, the 8th foot of the first IC chip U1 be the output end of triggering conversion circuit, the other end of second resistance R2, theThe connection of the 5th foot of the other end of one capacitor C1 and the first IC chip U1 and its connecting pin are the ground connection for triggering conversion circuitEnd.
As shown in figure 3, delay control circuit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance in the present embodimentR6, the 7th resistance R7, the second capacitor C2 and first diode D1, the second capacitor C2 are electrolytic capacitors, and first diode D1 is steadyDiode is pressed, one end of the 4th resistance R4 is the anode of delay control circuit, the other end and the 5th resistance R5 of the 4th resistance R4One end connection, one end connection of the other end of the 5th resistance R5 and the 6th resistance R6 and its connecting pin is delay control circuitThe anode connection of triggering end, the other end of the 6th resistance R6 and the second capacitor C2, cathode, the first diode D1 of the second capacitor C2Cathode and the 7th resistance R7 one end connection and its connecting pin be delay control circuit output end, first diode D1 is justPole is connected with the other end of the 7th resistance R7 and its connecting pin is the ground terminal of delay control circuit.
As shown in figure 3, filter circuit includes the second diode D2 and third capacitor C3, third capacitor C3 in the present embodimentFor electrolytic capacitor, the just extremely input terminal of filter circuit of the second diode D2, the cathode and third capacitor of the second diode D2The anode of C3 connects and its connecting pin is the output end of filter circuit, and the cathode of third capacitor C3 is the ground terminal of filter circuit.
As shown in figure 3, in the present embodiment, constant-current control circuit include NMOS tube M1, the 8th resistance R8, the 9th resistance R9,Tenth resistance R10, the 4th capacitor C4, the 5th capacitor C5 and the second IC chip U2, the type of the second IC chip U2It number is SM2212E, one end of the 8th resistance R8 is the first control terminal of constant-current control circuit, the other end of the 8th resistance R8 and theThe 8th foot of two IC chip U2 connects, and the 5th foot of the second IC chip U2 and the connection of the 6th foot and its connecting pin areThe output end of constant-current control circuit, one end connection of the 4th foot and the 9th resistance R9 of the second IC chip U2, the 9th resistanceThe other end of R9 is connected with the drain electrode of NMOS tube M1, and the grid of NMOS tube M1 is the second control terminal of constant-current control circuit, and secondOne end connection of the 3rd foot and the tenth resistance R10 of IC chip U2, the 1st foot and the 4th of the second IC chip U2One end of capacitor C4 connects, one end connection of the 2nd foot and the 5th capacitor C5 of the second IC chip U2, the second integrated circuitThe bottom electrode of chip U2, the source electrode of NMOS tube M1, the other end of the tenth resistance R10, the 4th capacitor C4 the other end and the 5thThe other end of capacitor C5 connects and its connecting pin is the ground terminal of current constant control electric current.
As shown in figure 3, rectification circuit is realized using full bridge rectifier bridge heap Db, full bridge rectifier bridge heap Db's in the present embodiment1st foot is the firewire input terminal of rectification circuit, and the 3rd foot of full bridge rectifier bridge heap Db is the zero curve input terminal of rectification circuit, full-bridgeThe 2nd foot of rectifier bridge stack Db is the output end of rectification circuit, and the 4th foot of full bridge rectifier bridge heap Db is the ground terminal of rectification circuit.
As shown in figure 3, LED illuminating circuit is formed by several LED luminescence unit parallel connections in the present embodiment, each LED hairLight unit is connected by several LED Light-emitting diode LED 1-LEDn formed respectively, and n is the integer more than or equal to 1, several LEDThe positive parallel connected end of luminescence unit is the anode of LED illuminating circuit, and the cathode parallel connected end of several LED luminescence units is LED hairThe cathode of optical circuit.