CN204859676U - LED drive arrangement - Google Patents

LED drive arrangement Download PDF

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Publication number
CN204859676U
CN204859676U CN201520576492.9U CN201520576492U CN204859676U CN 204859676 U CN204859676 U CN 204859676U CN 201520576492 U CN201520576492 U CN 201520576492U CN 204859676 U CN204859676 U CN 204859676U
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China
Prior art keywords
module
led drive
voltage
load
power supply
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Withdrawn - After Issue
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CN201520576492.9U
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Chinese (zh)
Inventor
吴泉清
刘军
俞秀峰
李国成
滕斌
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CR Powtech Shanghai Ltd
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CR Powtech Shanghai Ltd
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Abstract

The utility model provides a LED drive arrangement, LED drive arrangement includes: voltage input module, a power module, first switch tube, second power supply and load module and control module. The utility model discloses a LED drive arrangement does not need the inductance can realize the constant current control, can reduce drive arrangement's volume and practice thrift the cost, has higher output efficiency at whole operating voltage within range, the charging process is harmless charging, has effectively reduced the loss.

Description

LED drive device
Technical field
The utility model belongs to field of LED drive, particularly relates to a kind of LED drive device.
Background technology
21 century pursues energy-saving and emission-reduction and environmental protection, LED-backlit and illumination come into huge numbers of families day by day as novel green illumination, although current LED scheme is compared with advantages such as conventional light source energy-saving and environmental protection life-span long volume are little, but due to high light fixture high in cost of production factor of generating heat, LED scheme does not also obtain a large amount of popularizing.
In current LED-backlit or lighting driving device, prevailing way Switching Power Supply mode realizes current constant control by the HF switch of inductance.Fig. 1 is existing typical LED illumination drive unit, described drive unit comprise be made up of external power supply input, rectifier bridge BD1 and filter capacitor C1 voltage input module, constant-current driven chip U1, resistance Rstart, Rcs, R3, R4 and R5, electric capacity C2, C3 and C4, sustained diode 1 is with regard to D2, inductance L 1 and LED load; Wherein, described constant-current driven chip U1 comprises power switch pin SW, grounding pin GND, power supply sampling end CS, chip power supply power supply VCC, feedback signal sampling end DET and loop compensation pin COMP, described power switch pin SW is connected with described Power Entry Module, described grounding pin GND ground connection.Described resistance Rstart is connected between described Power Entry Module and LED load after connecting with described resistance R5 and described sustained diode 2; Described resistance Rcs is connected with described power supply sampling end CS as sampling resistor one end, and the other end is connected with described LED load via described inductance L 1; Described resistance R3 and R4 is in parallel with described inductance L 1 after connecting; Described electric capacity C3 is in parallel with described LED load; Described feedback signal sampling end DET is connected between described resistance R3 and R4; Described electric capacity C2 one end is connected with described chip power supply power supply VCC, other end ground connection; Described electric capacity C4 one end is connected with described loop compensation pin COMP, other end ground connection; Described sustained diode 1 one end is connected between described resistance Rcs and described power supply sampling end CS, other end ground connection.But employ inductance L 1 in this LED illumination drive unit, use the HF switch of inductance L 1 to realize current constant control, the use of inductance L 1 can make the cost of LED illumination drive unit and volume increase.
Fig. 2 is active PF linear power supply drive unit in prior art, and described drive unit comprises external AC power supply (comprising live wire ACL and zero line ACN), the positive pole LED+ of rectifier bridge DB1, fuse F1, LED load and negative pole LED-, electrochemical capacitor CE1, switching tube Q1, constant-current controller U1, electric capacity C1, C2 and C3, resistance R1 ~ R9; Wherein, described constant-current controller 1 comprises output pin OUT, loop compensation pin COM, grounding pin GND, chip power supply power supply VCC and power supply sampling end CS; Described rectifier bridge DB1 is connected with described external AC power supply; Described fuse F1 is connected on the live wire ACL between described rectifier bridge DB1 and described external AC power supply; After described electrochemical capacitor CE1, switching tube Q1 and resistance R2 series connection, one end is connected with the forward output of described rectifier bridge DB1, and the other end is connected with the negative sense output of described rectifier bridge DB1; Described resistance R1 is in parallel with described resistance R2; The positive pole LED+ of described LED load is connected with the forward output of described rectifier bridge DB1; Described resistance R4 and R6 is connected between the positive pole LED+ of described LED load and negative pole LED-after connecting; The negative pole LED-of described LED load is connected with described output pin OUT; Described resistance R6 one end is connected with the grid of described switching tube Q1, and the other end is connected with described loop compensation pin COM; Described first electric capacity C1 one end is connected with described chip power supply power supply VCC, other end ground connection; Described electric capacity C2 one end is connected with described loop compensation pin COM, other end ground connection; Described electric capacity C3 is in parallel with described electric capacity C2; Described resistance R7 is as sampling resistor, and one end is connected with described power supply sampling end CS, other end ground connection; After described resistance R8 and R9 parallel connection, one end is connected with the negative pole LED-of described LED load, and the other end is connected with described resistance R7.But this active PF (High Power Factor) linear power supply drive unit, although this circuit can ensure High Power Factor, the efficiency of this circuit is very low, indirectly adds the cost of fin.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of LED drive device, for solving the problem making the cost of LED drive device and volume increase that LED drive device of the prior art causes owing to using inductance, and the efficiency using active PF linear power supply drive unit to exist is very low, indirectly adds the problem of fin cost.
For achieving the above object and other relevant objects, the utility model provides a kind of LED drive device, and described LED drive device comprises: voltage input module, the first supply module, the first switching tube, the second power supply and load blocks and control module;
Described voltage input module, the first supply module, the first switching tube, the second power supply and load blocks connect successively; Described voltage input module is suitable for providing input voltage; Described first supply module is suitable for being described second power supply and power load modules when described first switching tube conducting; Described second power supply and load blocks comprise the second power supply unit and load, and described second power supply unit is connected with described load, is suitable for described load supplying;
Described control module is powered with described first switching tube and described second and load blocks is connected, and the voltage being suitable for exporting according to described second power supply and load blocks exports the control signal to described first switching tube.
As a kind of preferred version of LED drive device of the present utility model, described voltage input module comprises AC power and is connected to the rectifier bridge of described AC power.
As a kind of preferred version of LED drive device of the present utility model, described first supply module comprises the first electric capacity, and described second power supply unit comprises the second electric capacity.
As a kind of preferred version of LED drive device of the present utility model, described first supply module also comprises second switch pipe, and described second switch pipe is connected with described first supply module, is suitable for the control to described first supply module self charging.
As a kind of preferred version of LED drive device of the present utility model, described LED drive device also comprises detection module;
Described detection module is connected with described voltage input module and described control module, be suitable for the forward voltage values detecting the output of described voltage input module, and the forward voltage values detected is supplied to described control module, so that described control module exports the control signal to described second switch pipe according to described forward voltage values.
As a kind of preferred version of LED drive device of the present utility model, described detection module comprises the first resistance and the second resistance; Described first resistance and described second resistant series form cascaded structure, and described cascaded structure one end is connected with described voltage input module, other end ground connection.
As a kind of preferred version of LED drive device of the present utility model, described second power supply and load blocks also comprise current constant control pipe, and described current constant control pipe is connected with described load and described control module, is suitable for carrying out current constant control to described load.
As a kind of preferred version of LED drive device of the present utility model, described LED drive device also comprises sampling resistor, described sampling resistor one end is connected with described current constant control pipe, other end ground connection, and the current conversion being suitable for described current constant control pipe to export is sampled voltage.
As a kind of preferred version of LED drive device of the present utility model, described LED drive device also comprises driver module, described driver module is connected with described voltage input module, described control module and described first switching tube, is suitable for driving described first switching tube.
As a kind of preferred version of LED drive device of the present utility model, described LED drive device also comprises the 3rd supply module, is suitable for described driver module and powers.
As a kind of preferred version of LED drive device of the present utility model, described LED drive device also comprises VCC port and filter capacitor;
Described VCC port is connected with described voltage input module and described control module, is suitable for described control module and powers;
Described filter capacitor one end is connected with described VCC port, other end ground connection.
As mentioned above, the utility model provides a kind of LED drive device, has following beneficial effect: LED drive device of the present utility model does not need inductance to realize current constant control, can reduce the volume of drive unit and cost-saving; In whole operating voltage range, there is higher delivery efficiency; Charging process is harmless charging, effectively reduces loss.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram of LED illumination drive unit of the prior art.
Fig. 2 is shown as the schematic diagram of active PF linear power supply drive unit of the prior art.
Fig. 3 is shown as the syndeton schematic diagram of each module in LED drive device of the present utility model.
Fig. 4 is shown as the circuit diagram of LED drive device of the present utility model.
Fig. 5 is shown as the working waveform figure of each several part of LED drive device of the present utility model.
Fig. 6 to Fig. 9 is shown as the circuit diagram of LED drive device of the present utility model in the different operating stage.
Element numbers explanation
1 voltage input module
2 first supply modules
3 second power supply and load blocks
4 control modules
5 detection modules
6 driver modules
7 the 3rd supply modules
Embodiment
Below by way of specific instantiation, execution mode of the present utility model is described, those skilled in the art the content disclosed by this specification can understand other advantages of the present utility model and effect easily.The utility model can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present utility model.
Refer to Fig. 3 to Fig. 9.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present utility model in a schematic way, though only show the assembly relevant with the utility model in diagram but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Refer to Fig. 3 to Fig. 4, the present embodiment provides a kind of LED drive device, and described LED drive device comprises: voltage input module 1, first supply module 2, first switching tube Q2, the second power supply and load blocks 3 and control module 4;
Described voltage input module 1, first supply module 2, first switching tube Q2, the second power supply and load blocks 3 connect successively; Described voltage input module 1 is suitable for providing input voltage; Described first supply module 2 is suitable for being that described second power supply and load blocks 3 are powered when described first switching tube Q2 conducting; Described second power supply and load blocks 3 comprise the second power supply unit and load, and described second power supply unit is connected with described load, is suitable for described load supplying;
Described control module 4 is powered with described first switching tube Q2 and described second and load blocks 3 is connected, and the voltage being suitable for exporting according to described second power supply and load blocks 3 exports the control signal to described first switching tube Q2.
Exemplarily, described voltage input module 1 comprises AC power, and described AC power comprises output terminals A C1 and AC2, fuse F1 and rectifier bridge BD1.
Exemplarily, the output terminals A C1 of described AC power and AC2 output voltage are sinusoidal voltage, and the output terminals A C1 of described AC power is connected to described rectifier bridge BD1, output terminals A C2 and is connected to described rectifier bridge BD1 via described fuse F1.Described fuse is connected between described AC power and described rectifier bridge BD1, for the protection of described voltage input module 1; Described rectifier bridge BD1 comprises two groups of diode groups in parallel, and each diode group comprises two diodes of series connection, and the output terminals A C2 of described AC power is connected to via described fuse F1 between two diodes of one of them diode group.The output voltage of described voltage input module 1 is the commutating voltage after sinusoidal voltage rectification, is the absolute value of sinusoidal voltage.
Exemplarily, described load comprises at least one LED, and preferably, in the present embodiment, it is the LED of 250V that described load comprises a rated voltage.
Exemplarily, described first switching tube Q2 can be upper switching tube, also can be lower switching tube.Described first switching tube Q2 is high-end switch pipe; Described first switching tube Q2 can be PMOS or NMOS tube, preferably, in the present embodiment, described first switching tube Q2 is upper switching tube, and be NMOS tube, the drain electrode of described first switching tube Q2 is connected with described voltage input module 1, and source electrode is connected with described load; NMOS tube has compared to PMOS that conducting resistance is little, cost is low, the advantage of easy manufacture.
Exemplarily, described first supply module 2 comprises the first electric capacity C1, and described second power supply unit comprises the second electric capacity C2.Use electric capacity to be that described load is powered as supply module, by the charge and discharge control of electric capacity, can realize harmless charging, micro-damage electric discharge, significantly reduces the loss in described LED drive device work.Within the whole work period, described first electric capacity C1 and described second electric capacity C2 at least one are described load uninterrupted power supply, guarantee that in the whole work period, described load there will not be flicker.
Exemplarily, described first supply module 2 also comprises second switch pipe Q1, and described second switch pipe Q1 can be connected between described first electric capacity C1 and described voltage input module 1, also can be connected between described first electric capacity C1 and earth terminal; Namely described second switch pipe can be connected with described voltage input module 1 one end, and the other end is connected with described first electric capacity C1, also can be connected with described first electric capacity C1 one end, other end ground connection.
Exemplarily, described second switch pipe Q1 can be PMOS or NMOS tube, preferably, in the present embodiment, described second switch pipe Q1 is NMOS tube, and the drain electrode of described second switch pipe Q1 is connected with described voltage input module 1, source ground, grid is connected with described control module 4; NMOS tube has compared to PMOS that conducting resistance is little, cost is low, the advantage of easy manufacture.
Exemplarily, described LED drive device also comprises detection module 5; Described detection module 5 is connected with described voltage input module 1 and described control module 4, be suitable for the forward voltage values detecting the output of described voltage input module 1, and the forward voltage values detected is supplied to described control module 4, so that described control module 4 exports the control signal to described second switch pipe Q1 according to described forward voltage values.
Exemplarily, described detection module 5 comprises the first resistance R1 and the second resistance R2; Described first resistance R1 connects with described second resistance R2 and forms cascaded structure, and described cascaded structure one end is connected with described voltage input module 1, other end ground connection; Preferably, in the present embodiment, described first resistance R1 one end is connected with described voltage input module 1, and the other end is via described second resistance R2 ground connection, and described control module 4 is connected to the current potential between described first resistance R1 and described second resistance R2.
Exemplarily, described detection module 5 detects HVin voltage, when HVin voltage is less than the output voltage of the 3rd setting voltage Vth and described voltage input module 1, and described second switch pipe Q1 conducting, described voltage input module 1 charges for described first supply module 2; When HVin voltage reaches described 3rd setting voltage Vth, described control module 4 controls described second switch pipe Q1 and turns off, and described voltage input module 1 stops charging for described first supply module 2; Now, to remain Vth constant for the magnitude of voltage of described first supply module 2.Detect at described detection module 5 and turn off described second switch pipe Q1 after HVin voltage reaches the 3rd setting voltage Vth, stop powering for described first supply module 2, the overtension of described first supply module 2 can be prevented, and then produce larger discharge loss when avoiding charging to described second charging module 4.
Exemplarily, described second power supply and load blocks 3 also comprise current constant control pipe Q3, and described current constant control pipe Q3 can be the device that any one such as triode can realize current constant control, and preferably, in the present embodiment, described current constant control pipe Q3 is NMOS tube.
Exemplarily, described current constant control pipe Q3 can be connected with the input of described load, also can be connected with the output of described load, and preferably, in the present embodiment, described current constant control pipe Q3 is connected with the output of described load.More preferably, the drain electrode of described current constant control pipe Q3 is connected with the output of described load, and the grid of described current constant control pipe Q3, source electrode and drain electrode are all connected with described control module 4.
Exemplarily, described LED drive device also comprises a sampling resistor Rcs; One end of described sampling resistor Rcs is connected with described current constant control pipe Q3, other end ground connection, and the current conversion being suitable for described current constant control pipe Q3 to export is sampled voltage; Concrete, in the present embodiment, described sampling resistor Rcs one end is connected with the source electrode of described current constant control pipe Q3, other end ground connection, and the current conversion being suitable for described current constant control pipe Q3 to export is sampled voltage Vcs.
Exemplarily, the grid of described control module 4 and described current constant control pipe Q3, source electrode and drain electrode are connected, and are connected with the grid of described first switching tube Q2; Described control module 4 detects the voltage V that described current constant control pipe Q3_D pole (namely current constant control pipe Q3 drains) described load returns q3_D(i.e. the voltage of described load outputs), as described V q3_Dwhen being more than or equal to the first setting voltage VH, described control module 4 controls described first switching tube Q2 and turns off, and only has described second electric capacity C2 to provide electric current for described load, and now the voltage of described second electric capacity C2 starts to decline, described V q3_Dalso decline thereupon; As described V q3_Dduring lower than the second setting voltage VL, described control module 4 controls described first switching tube Q2 conducting, described first electric capacity C1 and described second electric capacity C2 is described load supplying simultaneously, and described first electric capacity C1 is described second electric capacity C2 simultaneously charges, and guarantees that described load there will not be flicker.
Exemplarily, described LED drive device also comprises driver module 6, and described driver module 6 is connected with described voltage input module 1, described control module 4 and described first switching tube Q2, is suitable for the shutoff and the conducting that drive described first switching tube Q2.
Exemplarily, described LED drive device also comprises the 3rd supply module 7, described 3rd supply module 7 one end is connected with described driver module 6 and external integrated BS, and the other end is connected with the source electrode of described first switching tube Q2, is suitable for described driver module 6 and powers.Preferably, in the present embodiment, described 3rd supply module 7 comprises the 3rd electric capacity C3.
Exemplarily, described LED drive device also comprises VCC port and filter capacitor CVcc; Described VCC port is connected with described voltage input module 1 and described control module 4, is suitable for described control module 4 and powers; Described filter capacitor CVcc one end is connected with described VCC port, other end ground connection.
Exemplarily, described control module 4, driver module 6, first switching tube Q2, the first switching tube Q1, current constant control pipe Q3 and VCC port are all integrated in a chip.
Refer to Fig. 5, Fig. 5 is the working waveform figure of each several part of LED drive device of the present utility model.Wherein, Vin_ac is the voltage of input ac power, and HVin is the voltage after described rectifier bridge BD1, VC1 is the voltage at described first electric capacity C1 two ends, VC2 is the voltage at described second electric capacity C2 two ends, and Q3_D is the voltage that described current constant control pipe Q3 drains, and t0 to t5 is a work period.
In the t0 moment, input Vin_ac voltage is 0, the voltage V of now described current constant control pipe Q3 drain electrode q3_Dlower, described first electric capacity C1 and described second electric capacity C2 is simultaneously for LED powers.Along with the rising of Vin_ac voltage, until the t1 moment, the voltage of described first electric capacity C1 and described second electric capacity C2 is put to minimum point, VC1=VC2=HVin.As shown in Figure 6, in figure, dotted line is current path to the sense of current in t0 moment to t1 moment, and arrow represents sense of current.
Along with the continuation of input Vin_ac voltage raises, now HVin voltage is higher than the voltage of described first electric capacity C1 and described second electric capacity C2, HVin is that described first electric capacity C1 and described second electric capacity C2 charge simultaneously, and powers for described LED simultaneously, and this process lasts is to the t2 moment.As shown in Figure 7, in figure, dotted line is current path to the sense of current in t1 moment to t2 moment, and arrow represents sense of current.
In the t2 moment, due to the rising of HVin voltage, V q3_Dbe elevated to described first setting voltage VH, described first switching tube Q2 turns off by described control module 4, and described second electric capacity C2 and described LED disconnects with HVin, is powered to described LED by described C2.For convenience of signal, the voltage setting described first electric capacity C1 now reaches Vth, and described second switch pipe Q1 turns off, and described first electric capacity C1 stops charging (adjustment Vth can make system reach optimum performance).Until the t3 moment, then HVin voltage is raised to peak with Vin_ac change starts to decline, and is powered during this period by described second electric capacity C2 to LED always.As shown in Figure 8, in figure, dotted line is current path to the sense of current in t2 to t3 moment, and arrow represents sense of current.
In the t3 moment, described second electric capacity C2 reduces owing to giving LED supply power voltage, V q3_Dvoltage declines thereupon, works as V q3_Dwhen voltage drops to described second setting voltage VL, described first switching tube Q2 conducting, now because Vin_ac voltage drop is lower, therefore HVin=VC1, described first electric capacity C1 charge and power to LED to described second electric capacity C2.Described first electric capacity C1 and described second electric capacity C2 voltage are now V=(VC1*C1+VC2*C2)/(C1+C2), usually choose C1=C2, can obtain V=(VC1+VC2)/2, to charge end in the t4 moment.As shown in Figure 9, in figure, dotted line is current path to the sense of current in t3 to t4 moment, and arrow represents sense of current.
In the t4 moment, although V q3_Drising is had with the voltage of described second electric capacity C2, but V q3_Dvoltage does not reach described first setting voltage VH, and therefore described first switching tube Q2 is always open-minded, and described first electric capacity C1 and described second electric capacity C2 powers to LED simultaneously.Drop to before 0 at t5 moment Vin_ac, described first electric capacity C1 and described second electric capacity C2 is always in parallel to power to LED.As shown in Figure 6, in figure, dotted line is current path to the sense of current in t4 to t5 moment, and arrow represents sense of current.
After the t5 moment, described LED drive device starts the work of next cycle and circulates with this.
During this period, because LED has electric current to flow through always, therefore there will not be the problem of any flicker.
Owing to being Linear Driving, the main loss of system is at V q3_Don voltage, Eff ≈ VLED/ (VLED+V q3_D), as long as therefore set suitable described first setting voltage VH and described second setting voltage VL value, in the scope of whole operating voltage, described LED drive device can obtain very high efficiency.
In sum, the utility model provides a kind of LED drive device, and LED drive device of the present utility model does not need inductance to realize current constant control, can reduce the volume of drive unit and cost-saving; In whole operating voltage range, there is higher delivery efficiency; Charging process is harmless charging, effectively reduces loss.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model, such as, the utility model also can adopt three epitaxial loayers or many epitaxial loayers.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.

Claims (11)

1. a LED drive device, is characterized in that, described LED drive device comprises: voltage input module, the first supply module, the first switching tube, the second power supply and load blocks and control module;
Described voltage input module, the first supply module, the first switching tube, the second power supply and load blocks connect successively; Described voltage input module is suitable for providing input voltage; Described first supply module is suitable for being described second power supply and power load modules when described first switching tube conducting; Described second power supply and load blocks comprise the second power supply unit and load, and described second power supply unit is connected with described load, is suitable for described load supplying;
Described control module is powered with described first switching tube and described second and load blocks is connected, and the voltage being suitable for exporting according to described second power supply and load blocks exports the control signal to described first switching tube.
2. LED drive device according to claim 1, is characterized in that: described voltage input module comprises AC power and is connected to the rectifier bridge of described AC power.
3. LED drive device according to claim 1, is characterized in that: described first supply module comprises the first electric capacity, and described second power supply unit comprises the second electric capacity.
4. LED drive device according to claim 3, is characterized in that: described first supply module also comprises second switch pipe, and described second switch pipe is connected with described first supply module, is suitable for the control to described first supply module self charging.
5. LED drive device according to claim 4, is characterized in that: described LED drive device also comprises detection module;
Described detection module is connected with described voltage input module and described control module, be suitable for the forward voltage values detecting the output of described voltage input module, and the forward voltage values detected is supplied to described control module, so that described control module exports the control signal to described second switch pipe according to described forward voltage values.
6. LED drive device according to claim 5, is characterized in that: described detection module comprises the first resistance and the second resistance; Described first resistance and described second resistant series form cascaded structure, and described cascaded structure one end is connected with described voltage input module, other end ground connection.
7. LED drive device according to claim 1, is characterized in that: described second power supply and load blocks also comprise current constant control pipe, and described current constant control pipe is connected with described load and described control module, is suitable for carrying out current constant control to described load.
8. LED drive device according to claim 7, it is characterized in that: described LED drive device also comprises sampling resistor, described sampling resistor one end is connected with described current constant control pipe, other end ground connection, and the current conversion being suitable for described current constant control pipe to export is sampled voltage.
9. LED drive device according to claim 1, it is characterized in that: described LED drive device also comprises driver module, described driver module is connected with described voltage input module, described control module and described first switching tube, is suitable for driving described first switching tube.
10. LED drive device according to claim 9, is characterized in that: described LED drive device also comprises the 3rd supply module, is suitable for described driver module and powers.
11. LED drive device according to claim 1, is characterized in that: described LED drive device also comprises VCC port and filter capacitor;
Described VCC port is connected with described voltage input module and described control module, is suitable for described control module and powers;
Described filter capacitor one end is connected with described VCC port, other end ground connection.
CN201520576492.9U 2015-08-03 2015-08-03 LED drive arrangement Withdrawn - After Issue CN204859676U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106658879A (en) * 2015-08-03 2017-05-10 华润矽威科技(上海)有限公司 LED driving device and driving method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106658879A (en) * 2015-08-03 2017-05-10 华润矽威科技(上海)有限公司 LED driving device and driving method therefor
CN106658879B (en) * 2015-08-03 2019-05-21 华润矽威科技(上海)有限公司 LED drive device and its driving method

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