CN103260310A - LED light-dimmer driving circuit - Google Patents
LED light-dimmer driving circuit Download PDFInfo
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- CN103260310A CN103260310A CN2013101763509A CN201310176350A CN103260310A CN 103260310 A CN103260310 A CN 103260310A CN 2013101763509 A CN2013101763509 A CN 2013101763509A CN 201310176350 A CN201310176350 A CN 201310176350A CN 103260310 A CN103260310 A CN 103260310A
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Abstract
The invention discloses an LED light-dimmer driving circuit which comprises an alternating current entry switch, a rectification filtering unit, a voltage converting unit, a power supplying unit and a control unit, wherein the voltage converting unit is used for providing voltage for a load LED, the power supplying unit is used for providing working voltage for the control unit, and the control unit is used for outputting a corresponding light-dimmer control signal to the voltage converting unit to adjust the voltage, input to the load LED, of the voltage converting unit according to the change of the working voltage of the control unit. An extra silicon controlled switch is not needed, and rewiring is not needed. If the control unit adopts a control chip, the control chip does not need to be provided with a special detecting port. A peripheral circuit only comprises the rectification filtering unit and the power supplying unit for providing electricity for the control unit, so that the periphery circuit is simple, and cost in low.
Description
Technical field
The present invention relates to field of power electronics, more particularly, relate to a kind of LED light modulation drive circuit.
Background technology
Existing LED light modulation drive circuit, change the angle of flow of input voltage by controllable silicon, control chip need have the angle of flow detection pin position of a special use to receive the variation of input signal to judge the size of the angle of flow, again according to the size of the size adjustment output current of the angle of flow, thereby realize light modulation.Therefore, existing LED light modulation drive circuit need increase silicon-controlled device, needs the wiring of existing light fixture is adjusted, and control chip need increase the pin that is specifically designed to the detection angle of flow, the cost height, and can't realize sharing of PCB with the general light fixture that does not need dimming function.Another kind of existing LED light modulation drive circuit, utilize the existing switch of light fixture, realize dimming function by the speed and the number of times that detect this switch shutoff, but want control chip still to need to increase special-purpose detection pin, and its peripheral circuit needs several separating components, cost is compared controllable silicon light modulation and is descended to some extent, but not little, and can't realize sharing with the PCB of the general light fixture that does not need this function.
This invention need not extra SCR control switch, need not rewiring, need not the extra chips detection port, only need a general resistance to receive the power supply port that all schemes have, get hold of the time interval with service time of closing of lamp switch, control chip detects closing of ac input signal and opens the brightness regulation that namely can realize the LED lighting by the variation that detects self supply power voltage.
Summary of the invention
The present invention is directed to the above-mentioned defective of prior art, a kind of LED light modulation drive circuit is provided, need not extra SCR control switch, need not rewiring, when adopting control chip to control, control chip need not to possess special-purpose detection port, and circuits outside is simple, and cost is low.
The technical scheme that the present invention solves its technical problem employing is: a kind of LED light modulation drive circuit is provided, comprise the rectification filtering unit that interchange input switch, input are connected with described interchange input switch and be used to load LED that the voltage conversion unit of operating voltage is provided, described LED light modulation drive circuit also comprises power supply unit and control unit; Described power supply unit is connected between the output and described control unit of described rectification filtering unit, is used to described control unit that operating voltage is provided; Described control unit is exported corresponding dimming control signal to described voltage conversion unit, to regulate the voltage of described voltage conversion unit output loading LED according to the variation of its operating voltage.
Preferably, described power supply unit comprises starting resistance and first electric capacity; Described starting resistance one end connects described rectification filtering unit output head anode, and the other end connects the positive pole of described first electric capacity; The negative pole of described first electric capacity connects described rectification filtering unit negative pole of output end and ground connection.
Preferably, described control unit comprises first voltage comparator, hysteresis voltage comparator, state machine and dimming control signal generation module; The in-phase input end of described first voltage comparator is connected between described starting resistance and described first electric capacity to insert the operating voltage of described control unit, and inverting input is imported first magnitude of voltage, and output connects described state machine; The in-phase input end of described hysteresis voltage comparator is connected between described starting resistance and described first electric capacity to insert the operating voltage of described control unit, an inverting input is imported second magnitude of voltage, another inverting input input tertiary voltage value, output connects described state machine; Described first magnitude of voltage is less than described second magnitude of voltage, and described second magnitude of voltage is less than described tertiary voltage value; Described state machine enters different states according to the operating voltage of described control unit with first comparative result to the tertiary voltage value; Described dimming control signal generation module is exported corresponding dimming control signal to described voltage conversion unit according to the different conditions of described state machine.
Preferably, described voltage conversion unit comprises transformer, power tube and is connected in current sense resistor between described power tube and the ground; Described power tube is according to the dimming control signal conducting of described control unit output or end, so that transformer is exported corresponding voltage to load LED.
Preferably, described power tube is metal-oxide-semiconductor, the grid of metal-oxide-semiconductor connects the signal output part of described dimming control signal generation module, and its source electrode is through described current sense resistor ground connection, and its drain electrode connects described rectification filtering unit output head anode through the former limit of described transformer winding; The secondary winding of described transformer connects load LED.
Preferably, described power tube is triode, the base stage of triode connects the signal output part of described dimming control signal generation module, and its emitter is through described current sense resistor ground connection, and its collector electrode connects described rectification filtering unit output head anode through the former limit of described transformer winding; The secondary winding of described transformer connects load LED.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate pole control circuit and second voltage comparator; Described signal processing module is regulated described logical circuit according to the current state of described state machine, outputs to described voltage conversion unit so that described logical circuit generates the dimming control signal of corresponding duty ratio behind described gate pole control circuit; The in-phase input end of described second voltage comparator is connected between described power tube and the described current sense resistor, and inverting input inserts reference voltage, and output connects described logical circuit.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate pole control circuit and second voltage comparator; Described signal processing module is regulated the voltage of the inverting input of described second voltage comparator of output according to the current state of described state machine; The in-phase input end of described second voltage comparator is connected between described power tube and the described current sense resistor, and output connects described logical circuit; Described logical circuit generates the dimming control signal of corresponding duty ratio according to the comparative result of two voltages of described second voltage comparator of input, and outputs to described voltage conversion unit behind described gate pole control circuit.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate pole control circuit and second voltage comparator; Described signal processing module is connected with the inverting input of described logical circuit with described second voltage comparator respectively, the in-phase input end of described second voltage comparator is connected between described power tube and the described current sense resistor, and output connects described logical circuit; Described signal processing module is regulated described logical circuit according to the current state of described state machine and/or is exported the voltage of the inverting input of described second voltage comparator, so that described logical circuit generates the dimming control signal of corresponding duty ratio, and behind described gate pole control circuit, output to described voltage conversion unit.
Preferably, described rectification filtering unit comprises rectifier bridge and second electric capacity, the input anode of described rectifier bridge is through described interchange input switch incoming transport power supply, the positive pole of described second electric capacity is connected the positive pole of the output of described rectifier bridge, and the negative pole of described second electric capacity connects negative pole and the ground connection of the output of rectifier bridge.
LED light modulation drive circuit of the present invention has following beneficial effect: the variation of the supply power voltage by detecting control unit self, thereby detect exchange input switch close and open-minded, realization is to the control of load LED brightness, need not extra SCR control switch, need not rewiring, realize control unit if adopt control chip, control chip need not to possess special-purpose detection port, and peripheral circuit only comprises rectification filtering unit and is the power supply unit of control unit power supply, peripheral circuit is simple, and cost is low.
In addition, power supply unit comprises starting resistance and first electric capacity of series connection, and the number of elements of use is few, and cost is low.
Description of drawings
Fig. 1 is the functional block diagram of LED light modulation drive circuit of the present invention;
Fig. 2 is the circuit diagram of LED light modulation drive circuit first embodiment of the present invention;
Fig. 3 is the graph of a relation of the operating voltage Vcc of the output voltage V in of rectification filtering unit of the present invention and control unit;
The graph of a relation of Fig. 4 control chip operating voltage of the present invention Vcc and operating current Ivcc, enabling signal POR and state machine reset signal Reset;
Fig. 5 is the circuit diagram of LED light modulation drive circuit second embodiment of the present invention;
Fig. 6 is the circuit diagram of LED light modulation drive circuit the 3rd embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention will be further explained explanation.
Fig. 1 is the functional block diagram of LED light modulation drive circuit 100 of the present invention, as shown in Figure 1, LED light modulation drive circuit 100 of the present invention comprises interchange input switch 110, rectification filtering unit 120, voltage conversion unit 130, power supply unit 140 and control unit 150.Wherein, the input of rectification filtering unit 120 is through exchanging input switch 110 incoming transport power supply Vac.Power supply unit 140 is connected between the output and control unit 150 of rectification filtering unit 120, is used to control unit 150 that operating voltage is provided.Control unit 150 is exported corresponding dimming control signal to voltage conversion unit 130 according to the variation of power supply unit 140 for its operating voltage that provides.Voltage conversion unit 130 is regulated voltage or the electric current of output loading LED according to the dimming control signal of control unit 150 inputs, thereby realizes light modulation.
Fig. 2 is the circuit diagram of LED light modulation drive circuit 100 first embodiment of the present invention, as shown in Figure 2, in the present embodiment, rectification filtering unit 120 comprises rectifier bridge and the second capacitor C in, the input anode of rectifier bridge is through exchanging input switch 110 incoming transport power supplys, the positive pole of the second capacitor C in is connected the positive pole of the output of rectifier bridge, and the negative pole of the second capacitor C in connects negative pole and the ground connection of the output of rectifier bridge.
In other embodiments of the invention, power tube 132 can also be triode, its base stage connects the signal output part of dimming control signal generation module 154, emission detects resistance R cs ground connection through electrode current, and collector electrode connects the output head anode of the rectifier bridge of described rectification filtering unit 120 through the former limit of transformer 131 winding.
In the present embodiment, dimming control signal generation module 154 comprises signal processing module 1541, logical circuit 1542, gate pole control circuit 1543 and second voltage comparator 1544.Wherein, signal processing module 1541 is regulated logical circuit 1542 according to the current state of state machine 153, so that the dimming control signal that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132 behind gate pole control circuit 1543, thereby control power tube 132 conductings or end, and then make the transformer 131 specific voltages of output or electric current to load LED.The in-phase input end of second voltage comparator 1544 is connected between power tube 132 and the current sense resistor Rcs, and to detect the electric current (I=V/Rcs) of transformer 131 rim windings, inverting input inserts reference voltage Vref, and output connects logical circuit 1542.At this moment, second voltage comparator 1544 is used for constant current driving load LED.
In the present embodiment, control unit 150 can be realized by control chip, because the present invention is based on the variation of the operating voltage of control unit 150 and realizes light modulation, therefore, need not extra SCR control switch, need not rewiring, control chip need not to increase special-purpose detection pin, and the power supply port Vcc of control chip is connected between starting resistance Rst and the first capacitor C o with cut-in operation voltage.As shown in Figure 2, power tube 132 is connected to the driving pin OUT of control chip to receive the dimming control signal of gate pole control circuit 1543 outputs.Particularly, if power tube 132 is metal-oxide-semiconductor, drive the GATE pin that pin OUT refers to control chip, when being triode as if driving tube 132, drive the GATES pin that pin OUT refers to control chip.
When using control chip to realize control unit 150, first magnitude of voltage be control chip close voltage Voff, second magnitude of voltage is the out-of-work voltage Vstop of control chip, and the tertiary voltage value is the cut-in voltage Von of control chip, and the pass of these three voltages is Voff ﹤ Vstop ﹤ Von.
Referring to Fig. 3, when exchanging that input switch 110 disconnects and Vcc when being lower than Voff, state machine 153 zero clearings of control chip inside, other circuit of other overwhelming majority all quit work simultaneously, so the operating current Iop of control chip is very little.After exchanging input switch 110 closures, when Vcc rises to Von, hysteresis voltage comparator 152 output enabling signal POR are to state machine 153, this enabling signal POR impels state machine 153 to enter a certain set condition, other circuit of control chip is started working simultaneously, control chip operating current Iop increases, signal processing module 1541 is according to the corresponding logical circuit 1542 of state machine 153 status adjustment, so that dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132, thereby make the voltage conversion unit 130 corresponding voltages of output or electric current give load LED, for example be that load LED output voltage or electric current are 100% this moment.
When exchanging input switch 110 disconnections, because control chip works on and the last energy stored of the second capacitor C in is continued to be transformed into output, Vin voltage descend rapidly (as shown in Figure 3), simultaneously since Vin descend and cause control chip not obtain enough current feedback from Vin returning first capacitor C 0 on the VCC, so Vcc voltage Δ t1(Δ t1 be Vcc drop to the needed time span of Vstop from its maximum, be about tens of millisecond) in drop to Vstop, this moment, control chip quit work, stop to be other circuit supplies, chip operation electric current I op is die-offed, in Δ t2 interval, the decrease speed of Vcc voltage slows down, its decrease speed and starting resistance Rst, first capacitor C 0, the second capacitor C in and control chip are out-of-work current related, first capacitor C 0 is more big, starting resistance Rst is more big, and the decrease speed of Vcc voltage is more slow.The out-of-work electric current of control chip is more little, and the second capacitor C in is more little, and the decrease speed of Vcc voltage is more slow.Therefore, can be by the relation of suitable adjusting, make and to be closed to Vcc and to drop to the time Δ t3(Δ t3 of Voff for being closed to the time that Vcc drops to Voff from exchanging input switch 110 from exchanging input switch 110), for example, make from exchanging input switch 110 to be closed to the time Δ t3 that Vcc drops to Voff and to be about 1-2s, accessing preferably like this, the user experiences.If through Δ t2(Δ t2＜Δ t3, Δ t2 is for being closed to Vcc and dropping to less than the required time of certain magnitude of voltage of Voff from exchanging input switch 110) the closed input switch 110 that exchanges again after the time, make the Vcc minimum satisfy Voff＜Vcc＜Vstop, because Vcc〉Voff, so the time state machine 153 be not reset, and Vcc＜Vstop, make and to rise to Von when above as Vcc, hysteresis voltage comparator 152 produces an enabling signal POR output state machine 153, state machine 153 enters next predetermined state, control chip is started working simultaneously, signal processing module 1541 is regulated corresponding logical circuit 1542 according to the current state of state machine 153, so that dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132, thereby make the voltage conversion unit 130 corresponding voltages of output or electric current give load LED, for example, be 100% to become 50% for load LED output voltage or electric current this moment.
So analogize, each disconnection and in the regular hour (Δ t2) the closed process that exchanges input switch 110 regulate voltage or the electric current of an output loading LED, the variable quantity of each regulation voltage or electric current by control chip inside preestablish, corresponding with the state of state machine 153.If but current change quantity is too little, then needing to press the number of times that exchanges input switch 110 can be too much, it seems with practical conditions, electric current can be changed and be divided into for example three grades, be voltage or the electric current circulation change (only be used for example, be not used in restriction the present invention) between 100%--50%--25%--100% of output loading LED.
When exchanging time that input switch 110 disconnects during greater than Δ t3, Vcc drops to Voff, and first voltage comparator, 151 output reset signal Reset are to state machine 153, and state machine 153 resets.When powering on Deng next time, LED light modulation drive circuit 100 of the present invention will be exported 100% voltage or electric current to load LED again, and the state before not being subjected to influences.
Fig. 4 is the graph of a relation of control chip operating voltage Vcc of the present invention and operating current Ivcc, enabling signal POR and state machine reset signal Reset, as shown in Figure 4, when the operating voltage Vcc of control chip is lower than Voff, first voltage comparator 151 is to state machine 153 output reset signals, and state machine 153 resets.When the operating voltage Vcc of control chip greater than Vstop and reach when being greater than or equal to Von, the operating current Iop of control chip increases, hysteresis voltage comparator 152 output enabling signal POR are to state machine 153, and state machine 153 enters a predetermined state, perhaps enters next predetermined state.When the operating voltage Vcc of control chip reduces gradually, when being equal to or less than Vstop, the operating current Iop of control chip will reduce.
Fig. 5 is the circuit diagram of LED light modulation drive circuit 100 second embodiment of the present invention, and as shown in Figure 5, the difference of present embodiment and LED light modulation drive circuit 100 first embodiment is: the not direct control logic circuit 1542 of signal processing module 1541.In this embodiment, signal processing module 1541 is regulated the voltage of the inverting input of output second voltage comparator 1544 according to the current state of state machine 153.The in-phase input end of second voltage comparator 1544 inserts the voltage of the former limit winding of transformer 131, and with its positive and negative comparative result output logic circuit 1541 of the voltage of access mutually, so that dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132, thereby make the voltage conversion unit 130 corresponding voltages of output or electric current give load LED.
Fig. 6 is the circuit diagram of LED light modulation drive circuit 100 the 3rd embodiment of the present invention, as shown in Figure 6, the difference of present embodiment and LED light modulation drive circuit 100 first embodiment is: signal processing module 1541 is regulated voltage and/or the adjusting logical circuit 1542 of the inverting input of output second voltage comparator 1544 according to the current state of state machine 153, so that dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132, thereby make the voltage conversion unit 130 corresponding voltages of output or electric current give load LED.
For example, when exchanging that input switch 110 disconnects and Vcc when being lower than Voff, state machine 153 zero clearings of control chip inside.After exchanging input switch 110 closures, when Vcc rises to Von, hysteresis voltage comparator 152 output enabling signal POR are to state machine 153, and this enabling signal POR impels state machine 153 to enter a certain set condition, and the state of this setting corresponds to the voltage of load output 100% or the situation of electric current.Signal processing module 1541 is according to the corresponding logical circuit 1542 of state machine 153 status adjustment, so that dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that logical circuit 1542 generates corresponding duty ratio outputs to power tube 132, thereby make the voltage of voltage conversion unit 130 outputs 100% or electric current give load LED.
Exchanging input switch 110 disconnects, and it is closed again after duration is less than or equal to Δ t3, after Vcc rises to more than the Von, hysteresis voltage comparator 152 produces an enabling signal POR output state machine 153, state machine 153 enters next predetermined state, it is the voltage of load LED output 50% or the situation of electric current that the state that should be scheduled to corresponds to, signal processing module 1541 is regulated voltage and the adjusting logical circuit 1542 of the inverting input of output second voltage comparator 1544 according to the current state of state machine 153, combination by two kinds of regulative modes, the dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that makes logical circuit 1542 generate corresponding duty ratio outputs to power tube 132, thereby makes the voltage of voltage conversion unit 130 outputs 50% or electric current give load LED.
Afterwards, exchanging input switch 110 disconnects again, and it is closed again after duration is less than or equal to Δ t3, after Vcc rises to more than the Von, hysteresis voltage comparator 152 produces an enabling signal POR output state machine 153, state machine 153 enters next predetermined state, it is the voltage of load LED output 25% or the situation of electric current that the state that should be scheduled to corresponds to, signal processing module 1541 is regulated the voltage of the inverting input of output second voltage comparator 1544 according to the current state of state machine 153, second voltage comparator 1544 is with the comparative result output logic circuit 1542 of the voltage of two input input, the dimming control signal driving pin OUT from control chip behind gate pole control circuit 1543 that makes logical circuit 1542 generate corresponding duty ratio outputs to power tube 132, thereby make the voltage of voltage conversion unit 130 outputs 25% or electric current only be positioned at for example for the above content of load LED(, be not used in restriction the present invention).
In this embodiment, the state that signal processing module 1541 is current according to state machine 153 is selected to change the voltage of output second voltage comparator 1544 and is regulated one of corresponding logical circuit 1542 or mode that both control simultaneously to export corresponding voltage or electric current for load.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (10)
1. a LED light modulation drive circuit (100), comprise the rectification filtering unit (120) that interchange input switch (110), input are connected with described interchange input switch (110) and be used to load LED that the voltage conversion unit (130) of operating voltage is provided, it is characterized in that described LED light modulation drive circuit (100) also comprises power supply unit (140) and control unit (150); Described power supply unit (140) is connected between the output and described control unit (150) of described rectification filtering unit (120), is used to described control unit (150) that operating voltage is provided; Described control unit (150) is exported corresponding dimming control signal to described voltage conversion unit (130), to regulate the voltage of described voltage conversion unit (130) output loading LED according to the variation of its operating voltage.
2. LED light modulation drive circuit according to claim 1 (100) is characterized in that, described power supply unit (140) comprises starting resistance (Rst) and first electric capacity (C0); Described starting resistance (Rst) end connects described rectification filtering unit (120) output head anode, and the other end connects the positive pole of described first electric capacity (C0); The negative pole of described first electric capacity (C0) connects described rectification filtering unit (120) negative pole of output end and ground connection.
3. LED light modulation drive circuit according to claim 2 (100), it is characterized in that described control unit (150) comprises first voltage comparator (151), hysteresis voltage comparator (152), state machine (153) and dimming control signal generation module (154); The in-phase input end of described first voltage comparator (151) is connected between described starting resistance (Rst) and described first electric capacity (C0) to insert the operating voltage of described control unit (150), inverting input is imported first magnitude of voltage, and output connects described state machine (153); The in-phase input end of described hysteresis voltage comparator (152) is connected between described starting resistance (Rst) and described first electric capacity (C0) to insert the operating voltage of described control unit (150), an inverting input is imported second magnitude of voltage, another inverting input input tertiary voltage value, output connects described state machine (153); Described first magnitude of voltage is less than described second magnitude of voltage, and described second magnitude of voltage is less than described tertiary voltage value; Described state machine (153) enters different states according to the operating voltage of described control unit (150) with first comparative result to the tertiary voltage value; Described dimming control signal generation module (154) is exported corresponding dimming control signal to described voltage conversion unit (130) according to the different conditions of described state machine (153).
4. LED light modulation drive circuit according to claim 3 (100), it is characterized in that described voltage conversion unit (130) comprises transformer (131), power tube (132) and is connected in current sense resistor (Rcs) between described power tube (132) and the ground; Described power tube (132) is according to the dimming control signal conducting of described control unit (150) output or end, so that the corresponding voltage of transformer (131) output is to load LED.
5. LED light modulation drive circuit according to claim 4 (100), it is characterized in that, described power tube (132) is metal-oxide-semiconductor, the grid of metal-oxide-semiconductor connects the signal output part of described dimming control signal generation module (154), its source electrode is through described current sense resistor (Rcs) ground connection, and its drain electrode connects described rectification filtering unit (120) output head anode through the former limit of described transformer (131) winding; The secondary winding of described transformer (131) connects load LED.
6. LED light modulation drive circuit according to claim 4 (100), it is characterized in that, described power tube (132) is triode, the base stage of triode connects the signal output part of described dimming control signal generation module (154), its emitter is through described current sense resistor (Rcs) ground connection, and its collector electrode connects described rectification filtering unit (120) output head anode through the former limit of described transformer (131) winding; The secondary winding of described transformer (131) connects load LED.
7. according to claim 5 or 6 described LED light modulation drive circuits (100), it is characterized in that described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate pole control circuit (1543) and second voltage comparator (1544); Described signal processing module (1541) is regulated described logical circuit (1542) according to the current state of described state machine (153), outputs to described voltage conversion unit (130) so that described logical circuit (1542) generates the dimming control signal of corresponding duty ratio behind described gate pole control circuit (1543); The in-phase input end of described second voltage comparator (1544) is connected between described power tube (132) and the described current sense resistor (Rcs), and inverting input inserts reference voltage, and output connects described logical circuit (1542).
8. according to claim 5 or 6 described LED light modulation drive circuits (100), it is characterized in that described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate pole control circuit (1543) and second voltage comparator (1544); Described signal processing module (1541) is regulated the voltage of the inverting input of described second voltage comparator of output (1544) according to the current state of described state machine (153); The in-phase input end of described second voltage comparator (1544) is connected between described power tube (132) and the described current sense resistor (Rcs), and output connects described logical circuit (1542); Described logical circuit (1542) generates the dimming control signal of corresponding duty ratio according to the comparative result of two voltages of described second voltage comparator of input (1544), and outputs to described voltage conversion unit (130) behind described gate pole control circuit (1543).
9. according to claim 5 or 6 described LED light modulation drive circuits (100), it is characterized in that described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate pole control circuit (1543) and second voltage comparator (1544); Described signal processing module (1541) is connected with the inverting input of described logical circuit (1542) with described second voltage comparator (1544) respectively, the in-phase input end of described second voltage comparator (1544) is connected between described power tube (132) and the described current sense resistor (Rcs), and output connects described logical circuit (1542); Described signal processing module (1541) is regulated described logical circuit (1542) according to the current state of described state machine (153) and/or is exported the voltage of the inverting input of described second voltage comparator (1544), so that described logical circuit (1542) generates the dimming control signal of corresponding duty ratio, and behind described gate pole control circuit (1543), output to described voltage conversion unit (130).
10. LED light modulation drive circuit according to claim 1 (100), it is characterized in that, described rectification filtering unit (120) comprises rectifier bridge and second electric capacity (Cin), the input anode of described rectifier bridge is through described interchange input switch (110) incoming transport power supply, the positive pole of described second electric capacity (Cin) is connected the positive pole of the output of described rectifier bridge, and the negative pole of described second electric capacity (Cin) connects negative pole and the ground connection of the output of rectifier bridge.
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| CN103547041A (en) * | 2013-10-30 | 2014-01-29 | 辉芒微电子（深圳）有限公司 | LED driver circuit |
| CN103889114A (en) * | 2014-03-12 | 2014-06-25 | 辉芒微电子（深圳）有限公司 | LED dimming and driving circuit |
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| CN110035582A (en) * | 2019-04-22 | 2019-07-19 | 晨辉光宝科技股份有限公司 | LED lamp tube |
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| CN103547041A (en) * | 2013-10-30 | 2014-01-29 | 辉芒微电子（深圳）有限公司 | LED driver circuit |
| CN103547041B (en) * | 2013-10-30 | 2015-10-28 | 辉芒微电子（深圳）有限公司 | Led drive circuit |
| CN103889114A (en) * | 2014-03-12 | 2014-06-25 | 辉芒微电子（深圳）有限公司 | LED dimming and driving circuit |
| CN103889114B (en) * | 2014-03-12 | 2016-04-27 | 辉芒微电子（深圳）有限公司 | A kind of LED dimming driving circuit |
| CN109874201A (en) * | 2019-03-29 | 2019-06-11 | 广州腾龙电子塑胶科技有限公司 | A kind of two line lighting control systems |
| CN109874201B (en) * | 2019-03-29 | 2024-03-26 | 广州腾龙健康实业股份有限公司 | Two-wire illumination control system |
| CN110035582A (en) * | 2019-04-22 | 2019-07-19 | 晨辉光宝科技股份有限公司 | LED lamp tube |
| CN111511078A (en) * | 2020-03-12 | 2020-08-07 | 深圳市海洋王照明工程有限公司 | Spotlight and floodlight switching control circuit and lamp |
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