CN103260310B - LED light-dimmer driving circuit - Google Patents
LED light-dimmer driving circuit Download PDFInfo
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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 dimming driving circuit.
Background technology
Existing LED dimming driving circuit, the angle of flow of input voltage is changed by controllable silicon, control chip needs a special angle of flow and detects pin position to receive the change 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, thus realize light modulation.Therefore, existing LED dimming driving circuit needs to increase silicon-controlled device, need adjust the wiring of existing light fixture, and control chip needs to increase the pin being specifically designed to and detecting the angle of flow, cost is high, and cannot realize sharing of PCB with not needing the general light fixture of dimming function.Another kind of existing LED dimming driving circuit, utilize the existing switch of light fixture, dimming function is realized by the speed and number of times that detect this switch OFF, but control chip still needs to increase special detection pin, and its peripheral circuit needs several separating components, cost is compared controllable silicon light modulation and is declined to some extent, but not little, and cannot realize and not need the PCB of the general light fixture of this function to share.
This invention is without the need to extra SCR control switch, without the need to rewiring, without the need to extra chips detection port, only need general resistance receives the power supply port that all schemes have, get hold of the closedown of lamp switch and the time interval of service time, control chip is detected the closedown of ac input signal by the change detecting power itself voltage and is opened the brightness regulation that namely can realize LED illumination lamp.
Summary of the invention
The present invention is directed to the above-mentioned defect of prior art, a kind of LED dimming driving circuit is provided, without the need to extra SCR control switch, without the need to rewiring, when adopting control chip to control, control chip is without the need to possessing special detection port, and circuits outside is simple, cost is low.
The technical scheme that the present invention solves the employing of its technical problem is: provide a kind of LED dimming driving circuit, comprise and exchange rectification filtering unit that input switch, input be connected with described interchange input switch and for providing the voltage conversion unit of operating voltage for load LED, described LED dimming driving circuit also comprises power supply unit and control unit; Described power supply unit is connected between the output of described rectification filtering unit and described control unit, for providing operating voltage for described control unit; Described control unit, according to the change of its operating voltage, exports corresponding dimming control signal to described voltage conversion unit, to regulate the voltage of described voltage conversion unit output loading LED.
Preferably, described power supply unit comprises starting resistance and the 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 the 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 to access the operating voltage of described control unit between described starting resistance and described first electric capacity, and inverting input inputs the 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 access the operating voltage of described control unit, an inverting input inputs the second magnitude of voltage, another inverting input input third 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 third voltage value; Described state machine enters different states according to the operating voltage of described control unit from the comparative result of the first to third voltage value; Described dimming control signal generation module exports corresponding dimming control signal to described voltage conversion unit according to the different conditions of described state machine.
Preferably, the described voltage conversion unit current sense resistor that comprises transformer, power tube and be connected between described power tube and ground; The dimming control signal conducting that described power tube exports according to described control unit or cut-off, export corresponding power to load LED to make transformer.
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 winding of described transformer; The vice-side 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 winding of described transformer; The vice-side winding of described transformer connects load LED.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate control circuit and the second voltage comparator; Described signal processing module regulates described logical circuit according to the current state of described state machine, outputs to described voltage conversion unit with the dimming control signal making described logical circuit generate corresponding duty ratio after described gate control circuit; The in-phase input end of described second voltage comparator is connected between described power tube and described current sense resistor, and inverting input access reference voltage, output connects described logical circuit.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate control circuit and the second voltage comparator; The voltage of described signal processing module inverting input of the second voltage comparator according to the current state regulation output of described state machine; The in-phase input end of described second voltage comparator is connected between described power tube and 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 after described gate control circuit.
Preferably, described dimming control signal generation module comprises signal processing module, logical circuit, gate control circuit and the second voltage comparator; Described signal processing module is connected with the inverting input of described logical circuit and described second voltage comparator respectively, the in-phase input end of described second voltage comparator is connected between described power tube and described current sense resistor, and output connects described logical circuit; Described signal processing module regulates described logical circuit according to the current state of described state machine and/or exports the voltage of inverting input of described second voltage comparator, with the dimming control signal making described logical circuit generate corresponding duty ratio, and output to described voltage conversion unit after described gate control circuit.
Preferably, described rectification filtering unit comprises rectifier bridge and the 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 to the positive pole of the output of described rectifier bridge, and the negative pole of described second electric capacity connects the negative pole of the output of rectifier bridge and ground connection.
LED dimming driving circuit of the present invention has following beneficial effect: by the change of the supply power voltage of detection control unit self, thus detect and exchange the closedown of input switch and open-minded, realize the control to load LED luminance, without the need to extra SCR control switch, without the need to rewiring, control unit is realized according to control chip, control chip is without the need to possessing special detection port, and the power supply unit that peripheral circuit only comprises rectification filtering unit and powers for control unit, 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.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of LED dimming driving circuit of the present invention;
Fig. 2 is the circuit diagram of LED dimming driving circuit first embodiment of the present invention;
Fig. 3 is the graph of a relation of the output voltage Vin of rectification filtering unit of the present invention and the operating voltage Vcc of control unit;
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 resets signal Reset;
Fig. 5 is the circuit diagram of LED dimming driving circuit second embodiment of the present invention;
Fig. 6 is the circuit diagram of LED dimming driving 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 dimming driving circuit 100 of the present invention, as shown in Figure 1, LED dimming driving 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 of rectification filtering unit 120 and control unit 150, for providing operating voltage for control unit 150.The change of the operating voltage that control unit 150 provides for it according to power supply unit 140, exports corresponding dimming control signal to voltage conversion unit 130.The dimming control signal that voltage conversion unit 130 inputs according to control unit 150, the voltage of regulation output load LED or electric current, thus realize light modulation.
Fig. 2 is the circuit diagram of LED dimming driving 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 electric capacity Cin, the input anode of rectifier bridge is through exchanging input switch 110 incoming transport power supply, the positive pole of the second electric capacity Cin is connected to the positive pole of the output of rectifier bridge, and the negative pole of the second electric capacity Cin connects the negative pole of the output of rectifier bridge and ground connection.
Power supply unit 140 comprises the output head anode of the rectifier bridge of starting resistance Rst and the first electric capacity C0, starting resistance Rst one end connection rectification filtering unit 120, and the other end connects the positive pole of the first electric capacity C0.The negative pole of the first electric capacity C0 connects the negative pole of output end of the rectifier bridge of rectification filtering unit 120.
Control unit 150 comprises the first voltage comparator 151, hysteresis voltage comparator 152, state machine 153 and dimming control signal generation module 154.Wherein, the in-phase input end of the first voltage comparator 151 is connected to the operating voltage Vcc of access control unit 150 between starting resistance Rst and the first electric capacity C0, and inverting input inputs the first magnitude of voltage, output connect state machine 153.The in-phase input end of hysteresis voltage comparator 152 is connected between starting resistance Rst and the first electric capacity C0 with the operating voltage of access control unit 150, an inverting input inputs the second magnitude of voltage, another inverting input input third voltage value, output connect state machine 153.Wherein, the first magnitude of voltage is less than the second magnitude of voltage, and the second magnitude of voltage is less than third voltage value.State machine 153 enters different states according to the operating voltage Vcc of control unit 150 from the comparative result of the first to third voltage value.Dimming control signal generation module 154 exports corresponding dimming control signal to voltage conversion unit 130 according to the different conditions of state machine 153.
Voltage conversion unit 130 comprises transformer 131, power tube 132 and current sense resistor Rcs.The dimming control signal conducting that power tube 132 exports according to control unit 150 or cut-off, export corresponding power to load LED to make transformer 131.In the present embodiment, power tube 132 is metal-oxide-semiconductor.The grid of metal-oxide-semiconductor connects the signal output part of dimming control signal generation module 154, and source electrode is through current sense resistor Rcs ground connection, and the former limit winding drained through transformer 131 connects the output head anode of the rectifier bridge of rectification filtering unit 120.The vice-side winding of transformer 131 connects load LED.
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, launch and detect resistance Rcs ground connection through electrode current, collector electrode connects the output head anode of the rectifier bridge of described rectification filtering unit 120 through the former limit winding of transformer 131.
In the present embodiment, dimming control signal generation module 154 comprises signal processing module 1541, logical circuit 1542, gate control circuit 1543 and the second voltage comparator 1544.Wherein, signal processing module 1541 regulates logical circuit 1542 according to the current state of state machine 153, after gate control circuit 1543, power tube 132 is outputted to the dimming control signal making logical circuit 1542 generate corresponding duty ratio, thus control power tube 132 conducting or cut-off, and then transformer 131 is made to export specific voltage or electric current to load LED.The in-phase input end of the second voltage comparator 1544 is connected between power tube 132 and current sense resistor Rcs, and to detect the electric current (I=V/Rcs) of transformer 131 former limit winding, inverting input access reference voltage Vref, output connects logical circuit 1542.Now, the second voltage comparator 1544 drives load LED for constant current.
In the present embodiment, control unit 150 can be realized by control chip, because the present invention realizes light modulation based on the change of the operating voltage of control unit 150, therefore, without the need to extra SCR control switch, without the need to rewiring, the power supply port Vcc of control chip, without the need to increasing special detection pin, is connected between starting resistance Rst and the first electric capacity Co with cut-in operation voltage by control chip.As shown in Figure 2, the dimming control signal that the driving pin OUT that power tube 132 is connected to control chip exports to receive gate control circuit 1543.Particularly, if power tube 132 is metal-oxide-semiconductor, drive pin OUT to refer to the GATE pin of control chip, if when driving tube 132 is triode, drive pin OUT to refer to the BASE pin of control chip.
When using control chip to realize control unit 150, first magnitude of voltage is the closedown voltage Voff of control chip, second magnitude of voltage is the out-of-work voltage Vstop of control chip, and third voltage value is the cut-in voltage Von of control chip, and the pass of these three voltages is Voff ﹤ Vstop ﹤ Von.
See Fig. 3, when exchange input switch 110 and disconnect and Vcc lower than Voff time, the state machine 153 of control chip inside resets, and simultaneously other circuit of other overwhelming majority all quit work, therefore the operating current Iop of control chip is very little.After interchange input switch 110 is closed, when Vcc rises to Von, hysteresis voltage comparator 152 exports enabling signal POR 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, power tube 132 is outputted to the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio, thus make voltage conversion unit 130 export corresponding voltage or electric current to load LED, such as now for load LED output voltage or electric current are 100%.
When exchanging input switch 110 and disconnecting, work on due to control chip and the energy that the second electric capacity Cin stores is continued to be transformed into output, Vin voltage declines rapidly (as shown in Figure 3), simultaneously cause control chip can not obtain enough current feedback from Vin returning the first electric capacity C0 VCC because Vin declines, so Vcc voltage is Vcc at Δ t1(Δ t1 drop to time span required for Vstop from its maximum, be about several ms) in drop to Vstop, now control chip quits work, stop as 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 electric capacity C0, current related after second electric capacity Cin and control chip master control quit work, first electric capacity C0 is larger, starting resistance Rst is larger, the decrease speed of Vcc voltage is slower.Electric current after control chip master control quits work is less, and the second electric capacity Cin is less, and the decrease speed of Vcc voltage is slower.Therefore, by the relation of suitable adjustment, can change and be closed to from interchange input switch 110 the time Δ t3 that Vcc drops to Voff, such as, make it be about 1-2s, good Consumer's Experience can be obtained like this.If through Δ t2(Δ t2< Δ t3, Δ t2 for from exchange input switch 110 be closed to Vcc drop to be less than Voff certain magnitude of voltage needed for time) again closedly after the time exchange input switch 110, Vcc minimum is made to meet Voff<Vcc<Vstop, due to Vcc>Voff, so time state machine 153 be not reset, and Vcc<Vstop, make when Vcc rises to more than Von, 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 regulates corresponding logical circuit 1542 according to the current state of state machine 153, power tube 132 is outputted to the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio, thus make voltage conversion unit 130 export corresponding voltage or electric current to load LED, such as, now for load LED output voltage or electric current are 100% become 50%.
So analogize, each disconnection and within the regular hour (Δ t2) closed voltage or the electric current exchanging a procedure regulation output loading LED of input switch 110, the variable quantity of each regulation voltage or electric current is preset by control chip inside, corresponding with the state of state machine 153.If but current change quantity is too little, then needing to press the number of times exchanging input switch 110 can be too much, it seems with practical conditions, curent change can be divided into such as three grades, the i.e. voltage of output loading LED or electric current circulation change (only for example, being not used in restriction the present invention) between 100%--50%--25%--100%.
When the time exchanging input switch 110 disconnection is greater than Δ t3, Vcc drops to Voff, and the first voltage comparator 151 exports reset signal Reset to state machine 153, and state machine 153 resets.When powering on Deng next time, the voltage of output 100% or electric current to load LED, and not to affect by state before by LED dimming driving circuit 100 of the present invention again.
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 resets signal Reset, as shown in Figure 4, when the operating voltage Vcc of control chip is lower than Voff, first voltage comparator 151 exports reset signal to state machine 153, and state machine 153 resets.When the operating voltage Vcc of control chip be greater than Vstop and reach be greater than or equal to Von time, the operating current Iop of control chip increases, hysteresis voltage comparator 152 exports enabling signal POR to state machine 153, and state machine 153 enters a predetermined state, or enters next predetermined state.When the operating voltage Vcc of control chip reduces gradually, until 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 dimming driving circuit 100 second embodiment of the present invention, and as shown in Figure 5, the difference of the present embodiment and LED dimming driving 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 according to the voltage of the inverting input of current state regulation output second voltage comparator 1544 of state machine 153.The voltage of the former limit winding of the in-phase input end access transformer 131 of the second voltage comparator 1544, and by the comparative result output logic circuit 1541 of its positive and negative voltage accessed mutually, output to power tube 132 with the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio, thus make voltage conversion unit 130 export corresponding voltage or electric current to load LED.
Fig. 6 is the circuit diagram of LED dimming driving circuit 100 the 3rd embodiment of the present invention, as shown in Figure 6, the difference of the present embodiment and LED dimming driving circuit 100 first embodiment is: signal processing module 1541 is according to the voltage of the inverting input of current state regulation output second voltage comparator 1544 of state machine 153 and/or regulate logical circuit 1542, power tube 132 is outputted to the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio, thus make voltage conversion unit 130 export corresponding voltage or electric current to load LED.
Such as, when exchange input switch 110 disconnect and Vcc lower than Voff time, the state machine 153 of control chip inside resets.After interchange input switch 110 is closed, when Vcc rises to Von, hysteresis voltage comparator 152 exports enabling signal POR 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 load and exports the voltage of 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, output to power tube 132 with the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio, thus make voltage conversion unit 130 export 100% voltage or electric current to load LED.
Exchange input switch 110 to disconnect, and again close after duration is less than or equal to Δ t3, after Vcc rises to more than Von, hysteresis voltage comparator 152 produces an enabling signal POR output state machine 153, state machine 153 enters next predetermined state, this predetermined state corresponds to as load LED exports the voltage of 50% or the situation of electric current, signal processing module 1541 is according to the voltage of the inverting input of current state regulation output second voltage comparator 1544 of state machine 153 and regulate logical circuit 1542, by the combination of two kinds of regulative modes, the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio outputs to power tube 132, thus make voltage conversion unit 130 export 50% voltage or electric current to load LED.
Afterwards, exchange input switch 110 again to disconnect, and again close after duration is less than or equal to Δ t3, after Vcc rises to more than Von, hysteresis voltage comparator 152 produces an enabling signal POR output state machine 153, state machine 153 enters next predetermined state, this predetermined state corresponds to as load LED exports the voltage of 25% or the situation of electric current, signal processing module 1541 is according to the voltage of the inverting input of current state regulation output second voltage comparator 1544 of state machine 153, the comparative result output logic circuit 1542 of the voltage that two input inputs by the second voltage comparator 1544, the driving pin OUT of dimming control signal from control chip after gate control circuit 1543 making logical circuit 1542 generate corresponding duty ratio outputs to power tube 132, thus make voltage conversion unit 130 export 25% voltage or electric current be only positioned at citing to 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, the mode selecting the voltage of change output second voltage comparator 1544 and one of corresponding logical circuit 1542 of adjustment or both simultaneously to control is corresponding voltage or electric current for load exports.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (8)
1. a LED dimming driving circuit (100), comprise and exchange input switch (110), the rectification filtering unit (120) that is connected with described interchange input switch (110) of input and for providing the voltage conversion unit (130) of operating voltage for load LED, it is characterized in that, described LED dimming driving circuit (100) also comprises power supply unit (140) and control unit (150); Described power supply unit (140) is connected between the output of described rectification filtering unit (120) and described control unit (150), for providing operating voltage for described control unit (150); Described control unit (150), according to the change of its operating voltage, exports corresponding dimming control signal to described voltage conversion unit (130), to regulate the voltage of described voltage conversion unit (130) output loading LED;
Wherein, described power supply unit (140) comprises starting resistance (Rst) and the first electric capacity (C0); Described starting resistance (Rst) one 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;
Described control unit (150) comprises the 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 (Rs t) and described first electric capacity (C0) to access the operating voltage of described control unit (150), inverting input inputs the 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 access the operating voltage of described control unit (150), an inverting input inputs the second magnitude of voltage, another inverting input input third 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 third voltage value; Described state machine (153) enters different states according to the operating voltage of described control unit (150) from the comparative result of the first to third voltage value; Described dimming control signal generation module (154) exports corresponding dimming control signal to described voltage conversion unit (130) according to the different conditions of described state machine (153).
2. LED dimming driving circuit (100) according to claim 1, it is characterized in that, the current sense resistor (Rcs) that described voltage conversion unit (130) comprises transformer (131), power tube (132) and is connected between described power tube (132) and ground; The dimming control signal conducting that described power tube (132) exports according to described control unit (150) or cut-off, export corresponding voltage to load LED to make transformer (131).
3. LED dimming driving circuit (100) according to claim 2, 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 winding of described transformer (131); The vice-side winding of described transformer (131) connects load LED.
4. LED dimming driving circuit (100) according to claim 2, 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 winding of described transformer (131); The vice-side winding of described transformer (131) connects load LED.
5. the LED dimming driving circuit (100) according to claim 3 or 4, it is characterized in that, described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate control circuit (1543) and the second voltage comparator (1544); Described signal processing module (1541) regulates described logical circuit (1542) according to the current state of described state machine (153), outputs to described voltage conversion unit (130) with the dimming control signal making described logical circuit (1542) generate corresponding duty ratio after described gate control circuit (1543); The in-phase input end of described second voltage comparator (1544) is connected between described power tube (132) and described current sense resistor (Rcs), inverting input access reference voltage, output connects described logical circuit (1542).
6. the LED dimming driving circuit (100) according to claim 3 or 4, it is characterized in that, described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate control circuit (1543) and the second voltage comparator (1544); The voltage of described signal processing module (1541) inverting input of the second voltage comparator (1544) according to the current state regulation output of described state machine (153); The in-phase input end of described second voltage comparator (1544) is connected between described power tube (132) and 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 (1544) of input, and outputs to described voltage conversion unit (130) after described gate control circuit (1543).
7. the LED dimming driving circuit (100) according to claim 3 or 4, it is characterized in that, described dimming control signal generation module (154) comprises signal processing module (1541), logical circuit (1542), gate control circuit (1543) and the second voltage comparator (1544); Described signal processing module (1541) is connected with the inverting input of described logical circuit (1542) and 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 described current sense resistor (Rcs), and output connects described logical circuit (1542); Described signal processing module (1541) regulates described logical circuit (1542) according to the current state of described state machine (153) and/or exports the voltage of inverting input of described second voltage comparator (1544), with the dimming control signal making described logical circuit (1542) generate corresponding duty ratio, and output to described voltage conversion unit (130) after described gate control circuit (1543).
8. LED dimming driving circuit (100) according to claim 1, it is characterized in that, described rectification filtering unit (120) comprises rectifier bridge and the 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 to the positive pole of the output of described rectifier bridge, and the negative pole of described second electric capacity (Cin) connects the negative pole of the output of rectifier bridge and ground connection.
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| CN201310176350.9A CN103260310B (en) | 2013-05-14 | 2013-05-14 | LED light-dimmer driving circuit |
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| CN106068045A (en) * | 2015-04-21 | 2016-11-02 | Lg伊诺特有限公司 | Electric supply installation for LED |
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| CN103547041B (en) * | 2013-10-30 | 2015-10-28 | 辉芒微电子（深圳）有限公司 | Led drive 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 |
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| CN101193474A (en) * | 2006-11-24 | 2008-06-04 | 聚积科技股份有限公司 | Lighting device and brightness switching device thereof |
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| CN103260310A (en) | 2013-08-21 |
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Address after: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee after: Huimang Microelectronics (Shenzhen) Co.,Ltd. Address before: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee before: FREMONT MICRO DEVICES (SZ) Ltd. |