CN203167353U - Single-stage power supply-based LED constant-current driving PWM input light modulation circuit - Google Patents
Single-stage power supply-based LED constant-current driving PWM input light modulation circuit Download PDFInfo
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Abstract
Provided by the utility model is a single-stage power supply-based LED constant-current driving PWM input light modulation circuit that comprises an input power supply module, a power supply control module, an isolation power conversion module, a PWM input current adjusting module, a soft starting module, an output switch control module, and a constant-current feedback module. According to the utility model, the beneficial effects of the circuit are as follows: the PWM input current adjusting module and the output switch control module are added to the single-stage power supply LED constant-current driving circuit and the cooperation of the constant-current feedback module and a constant-voltage feedback module is used. Therefore, functions of light modulation, starting/closing, soft starting, and parallel connection of a plurality of single-stage power supplies and the like of the dual-stage power supply are realized; problems that the efficiency of the two-stage LED driving PWM light modulation circuit is low and the lighting effect of an LED lamp is low can be solved; the current energy-saving demand is satisfied; and the whole cost of the LED lamp is lowered and the intelligentization of the LED lamp is realized beneficially.
Description
Technical field
The utility model relates to LED and drives the field, refers in particular to a kind of single-stage power supply LED constant current and drives PWM input light adjusting circuit.
Background technology
Existing LED light modulation power circuit is mainly two kinds of forms:
As Fig. 1, alternating current AC changes into the constant DC dc voltage through single-stage power supply.The constant dc dc voltage carries out the pwm control circuit output current by the voltage-dropping type circuit again LED is carried out light modulation, opens, closes.
As Fig. 2, alternating current AC changes into the constant DC dc voltage through single-stage power supply.The constant dc dc voltage carries out the pwm control circuit output current by the booster type circuit again LED is carried out light modulation, opens, closes.
As seen, traditional LED light modulation power circuit has following shortcoming:
1, the two-stage circuit of Cai Yonging carries out constant current driving and PWM light modulation to LED, the complicated cost height of circuit.
2, the two-stage circuit loss ratio is bigger, and whole efficiency is lower, temperature rise.Unfavorable product is energy-efficient.
The utility model content
The purpose of this utility model is to have overcome above-mentioned defective, provides a kind of single-stage power supply LED constant current to drive PWM input light adjusting circuit.
The purpose of this utility model is achieved in that a kind of single-stage power supply LED constant current drives PWM input light adjusting circuit, and it comprises input power module, energy supply control module, isolated power modular converter, PWM input current adjusting module, soft start module, output switch control module and constant current feedback module;
Described input power module is provided with ac input end, and input power module links to each other with energy supply control module and isolated power modular converter; Described isolated power modular converter is provided with for the power supply output of giving each module for power supply and is used for the constant current voltage output end, and the isolated power modular converter links to each other with energy supply control module, constant current feedback module; Described energy supply control module links to each other with the isolated power modular converter, and energy supply control module also connects constant current feedback module and soft start module; Described PWM input current adjusting module is provided with the pwm control signal input, and the PWM input current links to each other with the constant current feedback module; Described output switch control module is provided with switching signal input and dc output end;
Described input power module is used for carrying out delivering to the isolated power conversion module behind the rectifying and wave-filtering behind the input AC electricity;
Described energy supply control module is for generation of the output of pulse-width signal control isolated power conversion module;
Described isolated power conversion module is used for the voltage isolated variable of input power module is formed the power supply output of each module and the constant current voltage output of driving LED;
Described PWM input current adjusting module, be used for adjusting the constant current feedback module and then adjusting the constant current voltage output that energy supply control module changes the isolated power modular converter according to the PMW control signal output of input, make the constant current voltage output of isolated power modular converter under the PMW control signal of different duty be the electric current of same ratio;
Described soft start module is used for making that the output of constant current voltage was slowly risen when the isolated power modular converter started;
Described output switch control module is used for the switching signal according to input, the opening and closing of control constant current voltage output;
Described constant current feedback module, be used for according to the constant current voltage output of isolated power modular converter and the adjustment signal of PWM input current adjusting module, the output constant current controls signal to energy supply control module by pulse-width modulation and then adjusts the isolated power modular converter provides required constant current output;
In the said structure, described PWM input current adjusting module comprises electric current adjustment feedback unit, PWM Integral Transformation unit and the PWM isolated location that connects successively, wherein electric current adjustment feedback unit links to each other with the constant current feedback module, the PWM isolated location links to each other with the isolated power modular converter and is provided with the pwm control signal input;
In the said structure, it also comprises the constant voltage feedback module, and described constant voltage feedback module links to each other with isolated power modular converter, energy supply control module and output switch control module; Described constant voltage feedback module, be used for according to the constant current voltage output of isolated power modular converter and the standby signal of output switch control module, output voltage control signal limits its constant current voltage output to controlling energy supply control module by pulse-width modulation adjustment isolated power modular converter when zero load; Described output switch control module also is used for the constant current voltage that the output standby signal is adjusted the isolated power modular converter to constant voltage feedback module control energy supply control module by pulse-width modulation when zero load and exports minimum to;
Best, described constant voltage feedback module comprises continuous constant voltage feedback unit and constant voltage sampling unit, wherein the constant voltage feedback unit also links to each other with power supply output and the output switch control module of energy supply control module, isolated power conversion module; The constant voltage sampling unit links to each other with the constant current voltage output end of isolated power conversion module;
In the said structure, described isolated power modular converter comprises isolated power converting unit and coupled power switch unit, first auxiliary power unit, output rectification filtering unit and second auxiliary power unit; Described power switch unit also links to each other with input power module, energy supply control module; Described first auxiliary power unit also links to each other with energy supply control module; Described isolated power converting unit also links to each other with energy supply control module; Described output rectification filtering unit also links to each other with constant voltage feedback module, constant current feedback module and output switch control module; Described second auxiliary power unit also is connected with auxiliary power unit, and auxiliary power unit links to each other with constant voltage feedback module, constant current feedback module and PWM input current adjusting module;
In the said structure, it also comprises isolation module and boost voltage output module; Described energy supply control module is by isolation module and constant current feedback module, and constant voltage feedback module and soft start module link to each other; Described isolation module also connects the isolated power modular converter; Described isolated power modular converter connects the boost voltage output module, and the boost voltage output module is provided with the 12V dc output end;
In the said structure, described output switch control module comprises output open and close unit, output switching signal isolation drive unit and closes and reduce the output voltage unit; Wherein, output switching signal isolation drive unit is provided with the switching signal input, and output switching signal isolation drive unit is with output open and close unit and close and reduce the output voltage unit and link to each other, closes minimizing output voltage unit and links to each other with the constant voltage feedback module; Described output open and close unit links to each other with the isolated power modular converter and is provided with dc output end;
In the said structure, described energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit; Described driver element and ZCD zero passage detection unit link to each other with the isolated power modular converter respectively; Described feedback unit links to each other with constant voltage feedback module, constant current feedback module and soft start module; Described power supply PWM control PFC unit also links to each other with input power module;
In the said structure, described input power module comprises anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connects successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit output connects energy supply control module and isolated power modular converter;
In the said structure, described constant current feedback module comprises continuous constant current feedback unit and constant current sampling unit, and described constant current feedback unit also links to each other with power supply output and the PWM input current adjusting module of energy supply control module, isolated power conversion module; Described constant current sampling unit links to each other with constant current voltage output end and the output switch control module of isolated power conversion module; Described soft start module comprises continuous soft start unit and soft start sampling unit, and wherein the soft start unit also links to each other with energy supply control module, and the soft start sampling unit also links to each other with the power supply output of isolated power conversion module.
Than common LED light modulation power circuit, the beneficial effects of the utility model are to have increased PWM input current adjusting module and output switch control module in single-stage power supply LED constant-current drive circuit, cooperate the constant current feedback module, the constant voltage feedback module, got to the light modulation that comprises of twin-stage power supply, On/Off, soft start, functions such as a plurality of single-stage power supply parallel connections, and it is low to have solved two-stage LED driving PWM light adjusting circuit efficient, LED light fixture light efficiency hangs down the lamp problem, meet current energy-conservation demand, reduce the whole cost of LED light fixture simultaneously, be beneficial to the intellectuality of LED light fixture.
Description of drawings
Below in conjunction with accompanying drawing in detail concrete structure of the present utility model is described in detail
Fig. 1 is the existing LED light modulation power circuit schematic diagram that adopts the voltage-dropping type circuit;
Fig. 2 is the existing LED light modulation power circuit schematic diagram that adopts the booster type circuit;
Fig. 3 is schematic block circuit diagram of the present utility model;
Fig. 4 is the schematic block circuit diagram of specific embodiment of the utility model;
Fig. 5 is the specific embodiment of the utility model circuit diagram;
Fig. 6 is local amplifying circuit Fig. 1 of the utility model specific embodiment circuit diagram;
Fig. 7 is local amplifying circuit Fig. 2 of the utility model specific embodiment circuit diagram;
Fig. 8 is local amplifying circuit Fig. 3 of the utility model specific embodiment circuit diagram.
Embodiment
By describing technology contents of the present utility model, structural feature in detail, realized purpose and effect, give explanation below in conjunction with execution mode and conjunction with figs. are detailed.
Referring to Fig. 3, the utility model provides a kind of single-stage power supply LED constant current to drive PWM input light adjusting circuit,
It comprises input power module, energy supply control module, isolated power modular converter, PWM input current adjusting module, soft start module, output switch control module and constant current feedback module.
Each module annexation is:
Input power module is provided with ac input end, and input power module links to each other with energy supply control module and isolated power modular converter; Described isolated power modular converter is provided with for the power supply output of giving each module for power supply and is used for the constant current voltage output end, and the isolated power modular converter links to each other with energy supply control module, constant current feedback module; Described energy supply control module links to each other with the isolated power modular converter, and energy supply control module also connects constant current feedback module and soft start module; Described PWM input current adjusting module is provided with the pwm control signal input, and the PWM input current links to each other with the constant current feedback module; Described output switch control module is provided with switching signal input and dc output end.
The function of each module and interaction relationship are:
Input power module is used for carrying out delivering to the isolated power conversion module behind the rectifying and wave-filtering behind the input AC electricity;
Energy supply control module is for generation of the output of pulse-width signal control isolated power conversion module;
The isolated power conversion module is used for the voltage isolated variable of input power module is formed the power supply output of each module and the constant current voltage output of driving LED;
PWM input current adjusting module, be used for adjusting the constant current feedback module and then adjusting the constant current voltage output that energy supply control module changes the isolated power modular converter according to the PMW control signal output of input, make the constant current voltage output of isolated power modular converter under the PMW control signal of different duty be the electric current of same ratio;
The soft start module is used for making that the output of constant current voltage was slowly risen when the isolated power modular converter started;
The output switch control module is used for the switching signal according to input, the opening and closing of control constant current voltage output;
The constant current feedback module, be used for according to the constant current voltage output of isolated power modular converter and the adjustment signal of PWM input current adjusting module, the output constant current controls signal to energy supply control module by pulse-width modulation and then adjusts the isolated power modular converter provides required constant current output.
The utility model provides a kind of embodiment of the further refinement based on circuit module, and referring to Fig. 4, it also comprises constant voltage feedback module, isolation module and boost voltage output module.
Wherein the constant voltage feedback module links to each other with isolated power modular converter, energy supply control module and output switch control module, be for the standby signal of exporting and export switch control module according to the constant current voltage of isolated power modular converter, output voltage control signal limits its constant current voltage output to controlling energy supply control module by pulse-width modulation adjustment isolated power modular converter when zero load.Corresponding, above-mentioned output switch control module also is used for the constant current voltage that the output standby signal is adjusted the isolated power modular converter to constant voltage feedback module control energy supply control module by pulse-width modulation when zero load and exports minimum to.
Best, described constant voltage feedback module comprises continuous constant voltage feedback unit and constant voltage sampling unit, wherein the constant voltage feedback unit also links to each other with power supply output and the output switch control module of energy supply control module, isolated power conversion module; The constant voltage sampling unit links to each other with the constant current voltage output end of isolated power conversion module.
And isolation module is isolated for signal, and above-mentioned energy supply control module is by isolation module and constant current feedback module, and the constant voltage feedback unit of constant voltage feedback module and soft start module link to each other.And isolation module also connects the isolated power modular converter
The boost voltage output module then is to be connected with described isolated power modular converter, and the boost voltage output module is provided with the 12V dc output end, can be outer other equipment of circuit and carries out the power supply of 12V direct current.
Further, as an embodiment, input power module comprises anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connects successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit output connects energy supply control module and isolated power modular converter.
As an embodiment, energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit.Described driver element and ZCD zero passage detection unit link to each other with the isolated power modular converter respectively; Described feedback unit can link to each other with constant voltage feedback unit, constant current feedback module and the soft start module of constant voltage feedback module by above-mentioned isolation module; Described power supply PWM control PFC unit also links to each other with the rectification filtering unit of input power module.
As an embodiment, the isolated power modular converter comprises isolated power converting unit and coupled power switch unit, first auxiliary power unit, output rectification filtering unit and second auxiliary power unit; Described power switch unit also links to each other with the rectification filtering unit of input power module, the driver element of energy supply control module; Described first auxiliary power unit also links to each other with power supply PWM control PFC unit with the ZCD zero passage detection unit of energy supply control module; Described isolated power converting unit also links to each other with the power supply PWM control PFC unit of energy supply control module; Described output rectification filtering unit also links to each other with constant voltage sampling unit, constant current feedback module and the output switch control module of constant voltage feedback module; Described second auxiliary power unit also is connected with auxiliary power unit, and auxiliary power unit can link to each other with constant voltage feedback unit, constant current feedback module and the PWM input current adjusting module of above-mentioned isolation module, constant voltage feedback module.
As an embodiment, PWM input current adjusting module comprises electric current adjustment feedback unit, PWM Integral Transformation unit and the PWM isolated location that connects successively, wherein electric current adjustment feedback unit links to each other with the constant current feedback module, and the PWM isolated location links to each other with second auxiliary power unit of isolated power modular converter and is provided with the pwm control signal input.
As an embodiment, the output switch control module comprises output open and close unit, output switching signal isolation drive unit and closes and reduce the output voltage unit.Wherein, output switching signal isolation drive unit is provided with the switching signal input, output switching signal isolation drive unit is with output open and close unit and close and reduce the output voltage unit and link to each other, closes minimizing output voltage unit and links to each other with the constant voltage feedback unit of constant voltage feedback module; Described output open and close unit links to each other with the output rectification filtering unit of isolated power modular converter and is provided with dc output end.
As an embodiment, described constant current feedback module comprises continuous constant current feedback unit and constant current sampling unit, and the described constant current feedback unit also electric current of the auxiliary power supply that is connected of the power supply output of the feedback unit by isolation module and energy supply control module, isolated power conversion module and PWM input current adjusting module is adjusted feedback unit and linked to each other.The output open and close unit of the output rectification filtering unit that described constant current sampling unit also links to each other with the constant current voltage output end of isolated power conversion module and output switch control module links to each other.
As an embodiment, described soft start module comprises continuous soft start unit and soft start sampling unit, wherein the soft start unit also links to each other with the feedback unit of energy supply control module by isolation module, and second auxiliary power unit that the soft start sampling unit also links to each other with the power supply output of isolated power conversion module links to each other.
Be the circuit diagram of PWM input current adjusting module and correlation module thereof referring to Fig. 5 and Fig. 6, wherein the constant current feedback module is by resistance R 37, R46, R48, R50, R47, R34, R35, capacitor C 14 and voltage-stabiliser tube IC3 form, and capacitor C 4, C14 provide reference voltage 2.5V, the constant voltage feedback module comprises mainly that then resistance R 35, R47, R46, R48, R50 and voltage-stabiliser tube IC2 form, resistance R 37 is used for the constant current sampling, and the voltage of R37 sampling gained is superimposed upon in the constant voltage feedback module.The reference voltage of voltage-stabiliser tube IC3 is Vf=2.5V, suppose that the inner triode of voltage-stabiliser tube IC2 is that the voltage ratio that passes through to adjust resistance R 47, R35 and R46, R48, R50 of conducting can obtain V1, the voltage that acts on the resistance R 37 is V2, V2=Vf-V1, the V2 of gained is exactly the constant current sampling voltage, output current Iout=V2/R37.Relatively end and internal reference voltage that V2+V1 is superimposed upon voltage-stabiliser tube IC3 compare.
The optocoupler IC5 feedback quantity of control isolation module, the PWM IC of optocoupler IC5 adjustment primary circuit energy supply control module reaches the effect of constant current.The maximum constant current output current of the output current that under the prerequisite of the inner triode conducting of optocoupler IC2, obtains.
Resistance R 46, R48, R50, capacitor C 15, C16, optocoupler IC2, resistance R 5, R9, triode Q4, resistance R 11 is formed PWM input current adjusting module together.Pwm signal is by resistance R 11, triode Q4 drives optocoupler IC2 internal illumination voltage-stabiliser tube isolation coupling to the inner triode of optocoupler IC2, resistance R 46, R48, R50, capacitor C 15, C16, optocoupler IC2, the PWM integral unit that resistance R 5 is formed converts dimmer voltage to by it and changes voltage ratio in the constant current feedback unit, makes output current change.When pwm signal is maximum 100% high level, triode Q4 conducting, the inner triode conducting of optocoupler IC2, this moment, the electric current of output was maximum constant current output current.When the pwm signal duty ratio causes 50% by 100% accent, by triode Q4 driving switching signal is passed to optocoupler IC2, the inner triode of optocoupler IC2 outputs to the PWM integral unit with signal, and the voltage that is converted to makes the benchmark comparative voltage increase, thereby output current is decreased to 50%.When resistance R 5 is provided the groundwork biasing for the inner triode of optocoupler IC2 and guarantees to reduce to export electric output current to the feedback voltage of a degree of depth of voltage-stabiliser tube IC3 during at pwm signal 0%.
Referring to the relevant portion circuit diagram of Fig. 7 for output switch control module and periphery; there is not little bright phenomenon in the time of can realizing closing by this output switch control module; output voltage when cooperating the constant voltage feedback module to realize turning off standby simultaneously is lower than the LED normal working voltage, and protection LED avoids the surplus surge of electrochemical capacitor when power initiation.Reduced stand-by power consumption simultaneously.
Among the figure, resistance R 31, R33, voltage-stabiliser tube IC2, capacitor C 12, resistance R 39, optocoupler IC5 forms the constant voltage feedback unit, is the circuit of output voltage when stablizing zero load.
And resistance R 14, R13, R12, triode Q5, optocoupler IC1, triode Q3, resistance R 1, R61, R62, R64, R65, R63, diode D8, triode Q6 form output switching signal isolation drive unit.Switching signal is by resistance R 14, R13, R12, triode Q5 drives optocoupler IC1, the inner triode output signal of optocoupler IC1 drives triode Q3, the signal of triode Q3 output is divided into two-way, one the tunnel goes to turn-off the LED output circuit by resistance R 61 control metal-oxide-semiconductor Q5, another road energising resistance R64 drives triode Q6, and the relatively end of triode Q6 output voltage control voltage-stabiliser tube IC2 makes output voltage also controlled.
When ON/OFF is high level, triode Q5 conducting, the conducting of optocoupler IC1 interior light emitting diodes makes the inner triode conducting of IC1, also conducting of triode Q3,12V is by triode Q3, and resistance R 61 drives three metal-oxide-semiconductor Q5 and will export the LED conducting.The power supply of triode Q3 output also drives triode Q6 conductings by resistance R 64, and C low level does not very influence output voltage after the triode Q6 conducting.
When ON/OFF is low level, triode Q5 ends, optocoupler IC1 ends, and triode Q3 ends, and triode Q6 ends, 12V is by resistance R 63, diode D8 gives voltage-stabiliser tube IC2 relatively terminal voltage, and voltage-stabiliser tube IC2 is in degree of depth feedback, make elementary underloading or the gap operating state of being operated in by optocoupler IC5, output voltage reduces significantly.The reduction of output voltage and metal-oxide-semiconductor Q5 by making good the closing of LED, make that simultaneously the electrochemical capacitor charging voltage is below the normal operating voltage of LED when closing load.Prepare for starting next time, in order to avoid electrochemical capacitor is charged to the floating voltage higher than normal load LED is impacted when unloaded.
Referring to Fig. 8 be the soft start module and the periphery the relevant portion circuit diagram, output voltage slowly rises when making power initiation by this soft start module, and can set in start-up circuit start-up time.
The voltage of diode D1 output begins to rise by 0 during power initiation; the voltage signal that rises is by resistance R 41; capacitor C 11; resistance R 49 is coupled to triode Q4 base stage; triode Q4 conducting during startup, when passing to by optocoupler IC5 that power supply is elementary to make power initiation operating state by gap work progressively to normal operating conditions, thereby make the ascending normal voltage that progressively rises to of LED output voltage; finish the soft start action, protection LED avoids voltage surge and impacts.Wherein soft-start time is mainly by resistance R 41, resistance R 49, and capacitor C 11 determines that the effect of capacitor C 49 is played and prevented misoperation.
The utility model provides a kind of single-stage power supply LED constant current to drive PWM input light adjusting circuit, and is low at present existing two-stage LED constant current PWM light adjusting circuit efficient, problem points such as temperature rise height.The utility model has increased the PWM dimming interface by common single-stage power supply secondary feedback circuit is carried out brand-new circuit design, the ON/OFF interface.The utility model core technology realizes that main module comprises:
1, PWM input current adjusting module
2, soft start module
3, output ON/OFF control module
Cooperate the constant current feedback module, the constant voltage feedback module, it is low effectively to solve two-stage LED driving PWM light adjusting circuit efficient, and LED light fixture light efficiency hangs down the lamp problem.And the utility model circuit is supported a plurality of power supplys in parallel use simultaneously, has made things convenient for the application of present intelligent LED light fixture.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a single-stage power supply LED constant current drives PWM input light adjusting circuit, and it is characterized in that: it comprises input power module, energy supply control module, isolated power modular converter, PWM input current adjusting module, soft start module, output switch control module and constant current feedback module;
Described input power module is provided with ac input end, and input power module links to each other with energy supply control module and isolated power modular converter; Described isolated power modular converter is provided with for the power supply output of giving each module for power supply and is used for the constant current voltage output end, and the isolated power modular converter links to each other with energy supply control module, constant current feedback module; Described energy supply control module links to each other with the isolated power modular converter, and energy supply control module also connects constant current feedback module and soft start module; Described PWM input current adjusting module is provided with the pwm control signal input, and the PWM input current links to each other with the constant current feedback module; Described output switch control module is provided with switching signal input and dc output end.
2. single-stage power supply LED constant current as claimed in claim 1 drives PWM input light adjusting circuit, it is characterized in that: described PWM input current adjusting module comprises electric current adjustment feedback unit, PWM Integral Transformation unit and the PWM isolated location that connects successively, wherein electric current adjustment feedback unit links to each other with the constant current feedback module, and the PWM isolated location links to each other with the isolated power modular converter and is provided with the pwm control signal input.
3. single-stage power supply LED constant current as claimed in claim 1 drives PWM input light adjusting circuit, and it is characterized in that: it also comprises the constant voltage feedback module, and described constant voltage feedback module links to each other with isolated power modular converter, energy supply control module and output switch control module.
4. single-stage power supply LED constant current as claimed in claim 3 drives PWM input light adjusting circuit, it is characterized in that: described constant voltage feedback module comprises continuous constant voltage feedback unit and constant voltage sampling unit, and wherein the constant voltage feedback unit also links to each other with power supply output and the output switch control module of energy supply control module, isolated power conversion module; The constant voltage sampling unit links to each other with the constant current voltage output end of isolated power conversion module.
5. single-stage power supply LED constant current as claimed in claim 3 drives PWM input light adjusting circuit, it is characterized in that: described isolated power modular converter comprises isolated power converting unit and coupled power switch unit, first auxiliary power unit, output rectification filtering unit and second auxiliary power unit; Described power switch unit also links to each other with input power module, energy supply control module; Described first auxiliary power unit also links to each other with energy supply control module; Described isolated power converting unit also links to each other with energy supply control module; Described output rectification filtering unit also links to each other with constant voltage feedback module, constant current feedback module and output switch control module; Described second auxiliary power unit also is connected with auxiliary power unit, and auxiliary power unit links to each other with constant voltage feedback module, constant current feedback module and PWM input current adjusting module.
6. single-stage power supply LED constant current as claimed in claim 3 drives PWM input light adjusting circuit, and it is characterized in that: it also comprises isolation module and boost voltage output module; Described energy supply control module is by isolation module and constant current feedback module, and constant voltage feedback module and soft start module link to each other; Described isolation module also connects the isolated power modular converter; Described isolated power modular converter connects the boost voltage output module, and the boost voltage output module is provided with the 12V dc output end.
7. single-stage power supply LED constant current as claimed in claim 3 drives PWM input light adjusting circuit, it is characterized in that: described output switch control module comprises output open and close unit, output switching signal isolation drive unit and closes and reduce the output voltage unit; Wherein, output switching signal isolation drive unit is provided with the switching signal input, and output switching signal isolation drive unit is with output open and close unit and close and reduce the output voltage unit and link to each other, closes minimizing output voltage unit and links to each other with the constant voltage feedback module; Described output open and close unit links to each other with the isolated power modular converter and is provided with dc output end.
8. single-stage power supply LED constant current as claimed in claim 3 drives PWM input light adjusting circuit, and it is characterized in that: described energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit; Described driver element and ZCD zero passage detection unit link to each other with the isolated power modular converter respectively; Described feedback unit links to each other with constant voltage feedback module, constant current feedback module and soft start module; Described power supply PWM control PFC unit also links to each other with input power module.
9. any described single-stage power supply LED constant current drives PWM input light adjusting circuit as claim 1-8, and it is characterized in that: described input power module comprises anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connects successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit output connects energy supply control module and isolated power modular converter.
10. any described single-stage power supply LED constant current drives PWM input light adjusting circuit as claim 1-8, it is characterized in that: described constant current feedback module comprises continuous constant current feedback unit and constant current sampling unit, and described constant current feedback unit also links to each other with power supply output and the PWM input current adjusting module of energy supply control module, isolated power conversion module; Described constant current sampling unit links to each other with constant current voltage output end and the output switch control module of isolated power conversion module;
Described soft start module comprises continuous soft start unit and soft start sampling unit, and wherein the soft start unit also links to each other with energy supply control module, and the soft start sampling unit also links to each other with the power supply output of isolated power conversion module.
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| CN2013200841879U CN203167353U (en) | 2013-02-25 | 2013-02-25 | Single-stage power supply-based LED constant-current driving PWM input light modulation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902617A (en) * | 2015-04-21 | 2015-09-09 | 阳亮 | Current-constant driving light modulation circuit of LED of single-stage power supply |
| CN109600881A (en) * | 2018-12-25 | 2019-04-09 | 中山市卓越制品有限公司 | A kind of LED light pipe device |
-
2013
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902617A (en) * | 2015-04-21 | 2015-09-09 | 阳亮 | Current-constant driving light modulation circuit of LED of single-stage power supply |
| CN104902617B (en) * | 2015-04-21 | 2017-08-29 | 阳亮 | Single-stage power supply LED constant current drives light adjusting circuit |
| CN109600881A (en) * | 2018-12-25 | 2019-04-09 | 中山市卓越制品有限公司 | A kind of LED light pipe device |
| CN109600881B (en) * | 2018-12-25 | 2024-03-05 | 中山市卓越制品有限公司 | LED lamp tube device |
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