CN203387740U - Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof - Google Patents
Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof Download PDFInfo
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- CN203387740U CN203387740U CN201320480163.5U CN201320480163U CN203387740U CN 203387740 U CN203387740 U CN 203387740U CN 201320480163 U CN201320480163 U CN 201320480163U CN 203387740 U CN203387740 U CN 203387740U
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Abstract
The utility model provides a primary control LED drive circuit without auxiliary winding and a PFC constant current control circuit thereof. The LED drive circuit comprises the PFC constant current control circuit, a first capacitor, a first resistor, a voltage-divider network, a transformer, a secondary diode and an output capacitor, wherein the first terminal of the first capacitor is connected with the power port of the PFC constant current control circuit and the second terminal is connected with a ground port; the first terminal of the first resistor is connected with the sampling port of the PFC constant current control circuit and the second terminal is connected with the ground port; the voltage-divider network divides the voltage between the ground port and the ground, and the output terminal thereof is connected with the feedback port of the PFC constant current control circuit; the different name terminal of a primary winding of the transformer is connected with the ground port and the same name terminal of the primary winding is grounded; the anode of the secondary diode is connected with the same name terminal of a secondary winding; and the first terminal of the output capacitor is connected with the cathode of the secondary diode, and the second terminal is connected with the different name terminal of the secondary winding. The auxiliary winding is omitted, so that cost is favorably reduced, output voltage range is improved, and compatibility of the while machine is improved.
Description
Technical field
The utility model relates to the LED drive circuit technology, and LED drive circuit and PFC constant-current control circuit thereof are controlled in the former limit that relates in particular to the auxiliary winding of a kind of nothing.
Background technology
Fig. 1 is that the LED drive circuit system is controlled on traditional former limit of High Power Factor, comprising: rectification circuit, and this rectification circuit comprises diode D1～D4 and input capacitance Cin; Start and power supply circuits, this startup and power supply circuits comprise that resistance R 1, capacitor C 1, auxiliary winding are for electric diode D5; Transformer T1, this transformer T1 comprises former limit winding NP, secondary winding NS and auxiliary winding NA; Metal-oxide-semiconductor M1; Divider resistance R2 and R3; Building-out capacitor C2; Sampling resistor R4; Output sustained diode 6; Output capacitance C3; LED load and power factor correction (PFC) control circuit 100.Wherein, a termination of resistance R 1 is received input voltage vin, and the other end of resistance R 1 is connected for the end of electric diode D5 and the power pin VCC of control circuit 100 with an end of capacitor C 1, auxiliary winding; The other end ground connection of capacitor C 1, auxiliary winding is for the auxiliary winding NA of another termination transformer T1 of electric diode D5 and the end of divider resistance R2, the other end ground connection of the auxiliary winding NA of transformer T1, the feedback pin FB of another termination PFC control circuit 100 of divider resistance R2, and with the end of divider resistance R3, be connected, the other end ground connection of divider resistance R3.The termination of the former limit winding NP of transformer T1 is received input voltage vin, the other end connects the drain terminal of metal-oxide-semiconductor M1, the driving pin DRV of the grid termination PFC control circuit 100 of metal-oxide-semiconductor M1, the source of metal-oxide-semiconductor M1 meets the sampling pin CS of PFC control circuit 100, and with the end of divider resistance R3, be connected, the other end ground connection of divider resistance R3.The end of sampling resistor R4 connects the source electrode of metal-oxide-semiconductor M1, other end ground connection.
Wherein, the constant-current control module 101 of PFC control circuit 100 meets sampling pin CS, feedback pin FB and compensation pins COMP, and compensation pins COMP connects an end of capacitor C 2, the other end ground connection of capacitor C 2; UVLO and base modules 102 meet power pin VCC, the output termination driver module 103 of constant-current control module 101, the output termination driving tube pin DRV of driver module 103.The anode of the termination output sustained diode 6 of the secondary winding NS of transformer T1, the negative terminal of output sustained diode 6 connects the end of output capacitance C3, and with the anode of LED load, be connected, the negative terminal of the other end of output capacitance C3 and LED load links together.
With reference to figure 1, the operation principle that the LED drive circuit system is controlled on the former limit of this High Power Factor is as follows: when PFC control circuit 100 is working properly, drive pin DRV output logic high level, metal-oxide-semiconductor M1 conducting, the primary current of transformer T1 starts to rise by zero, the voltage of sampling pin CS rises, the voltage of feedback pin FB is logic low, constant-current control module 101 receives the signal of sampling pin CS and feedback pin FB, by sample signal amplitude on pin CS and detect the secondary diode current flow time by feedback pin FB of detection, calculate output current, then control ON time by calculating, after reaching the ON time of system requirements, drive pin DRV output logic low level, transformer T1 discharges by secondary, energy conduction to output.Whole system, by the sample voltage of pin CS and feedback pin FB of detection, is controlled by loop, makes constant output current, and higher power factor value is arranged.Wherein, compensation pins COMP connected system compensating network, maintain the stable of system by peripheral electric capacity or resistance-capacitance network.
When the circuit shown in Fig. 1 works, power supply circuits give the PFC control circuit 100 power supplies by auxiliary winding NA, auxiliary winding for electric diode D5 and capacitor C 1, and feedback pin FB is by assisting winding NA and divider resistance R2, R3 sense switch signal, for transferring to PFC control circuit 100, therefore in this system, auxiliary winding NA is absolutely necessary, and needs for power supply and input.
The auxiliary winding NA of transformer T1 can take certain cost when producing, auxiliary winding also can take certain cost for electric diode D5 and resistance R 1, and the number of turn of auxiliary winding NA need to be complementary with the number of turn of secondary winding NS, and the voltage of power port VCC and PFC control circuit 100 is withstand voltage relevant, the normal working voltage of general power port VCC is limited in scope, the voltage range of the scope of output voltage and power port VCC has certain corresponding relation, so can cause output voltage range can't accomplish wide-voltage range with auxiliary winding NA power supply, be unfavorable for the product of different output voltage specifications is accomplished to compatibility.
The utility model content
The technical problems to be solved in the utility model is to provide the former limit of the auxiliary winding of a kind of nothing and controls LED drive circuit and PFC constant-current control circuit thereof, can save auxiliary winding, is conducive to reduce costs, and improves output voltage range, improves the compatibility of complete machine.
For solving the problems of the technologies described above, the utility model provides a kind of PFC constant-current control circuit, have power port, port, sample port, input port and feedback port, this PFC constant-current control circuit comprises:
For detection of the supply voltage of described power port and according to this supply voltage conducting or disconnect the supply module of the connection between described power port and input port;
Power tube, its drain electrode connects described input port, and its grid connects described power port;
The source drive pipe, its drain electrode connects the source electrode of described power tube, and its source electrode connects described sample port;
Constant-current control module, its first input end is connected with described sample port and receives sampled signal from described sample port, its second input is connected with described feedback port and from described feedback port receiving feedback signals, drive signal according to its output, this driving signal is associated with described sampled signal and feedback signal, this driving signal transfers to the grid of described source drive pipe via driver module, in order to control the turn-on and turn-off of described source drive pipe.
According to an embodiment of the present utility model, described supply module comprises:
The power supply control module, its input connects described power port, for detection of the supply voltage of described power port, at described supply voltage during higher than this preset value, its output output logic high level, at described supply voltage during lower than this preset value, its output output logic low level;
Depletion type nmos transistor, its drain electrode connects described input port, and its source electrode connects described power port, and its grid connects the output of described power supply control module.
According to an embodiment of the present utility model, described PFC constant-current control circuit also has the compensation port, this compensation port connects the first end of compensating network, the second end of this compensating network connects described ground port, described constant-current control module also receives compensating signal from this compensation port, and produces described driving signal according to this compensating signal, sampled signal and feedback signal.
According to an embodiment of the present utility model, this PFC constant-current control circuit also comprises: base modules, its input connects described power port, in order to produce multiple reference signal for described supply module and/or constant-current control module.
The utility model also provides the former limit of the auxiliary winding of a kind of nothing to control LED drive circuit, comprising:
The described PFC constant-current control circuit of above-mentioned any one, its input port receives input voltage;
The first electric capacity, its first end connects the power port of described PFC constant-current control circuit, and its second end connects the ground port of described PFC constant-current control circuit;
The first resistance, its first end connects the sample port of described PFC constant-current control circuit, and its second end connects the ground port of described PFC constant-current control circuit;
Potential-divider network, carry out dividing potential drop to the ground port of PFC constant-current control circuit and the voltage between ground, and its output connects the feedback port of described PFC constant-current control circuit;
Transformer, the different name end of its former limit winding connects the ground port of described PFC constant-current control circuit, the Same Name of Ends ground connection of its former limit winding;
The secondary diode, its anodal Same Name of Ends that connects the secondary winding of described transformer;
Output capacitance, its first end connects the negative pole of described secondary diode, and its second end connects the different name end of the secondary winding of described transformer.
According to an embodiment of the present utility model, described potential-divider network comprises:
The second resistance, its first end connects the ground port of described PFC constant-current control circuit, and its second end connects the feedback port of described PFC constant-current control circuit;
The 3rd resistance, its first end connects the second end of described the second resistance, its second end ground connection.
According to an embodiment of the present utility model, this former limit is controlled LED drive circuit and is also comprised:
Rectifier bridge, carry out rectification to AC signal and produce described input signal;
Input capacitance, its first end connects the output of described rectifier bridge, its second end ground connection.
Compared with prior art, the utlity model has following advantage:
The former limit without auxiliary winding of the utility model embodiment is controlled LED drive circuit and can be adopted high pressure directly to power, without the auxiliary winding of process, and the PFC constant-current control circuit is connected to floating ground control mode, make feedback signal to detect and to obtain by former limit winding, also without the auxiliary winding of process, thereby can thoroughly save auxiliary winding, also saved in the lump the resistance for starting simultaneously and supplied electric diode, can reduce the peripheral circuit cost, and save the scope that auxiliary winding is conducive to add wide output voltage, improve the compatibility of complete machine.
The accompanying drawing explanation
Fig. 1 is the electrical block diagram that in prior art, the LED drive circuit system is controlled on the former limit of a kind of High Power Factor;
Fig. 2 is the electrical block diagram of the former limit control LED drive circuit without auxiliary winding of the utility model embodiment.
Embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but should not limit protection range of the present utility model with this.
With reference to figure 2, the former limit of the present embodiment is controlled LED drive circuit and is comprised: rectifier bridge, input capacitance Cin, PFC constant-current control circuit 200, the first capacitor C 1, the first resistance R 1, building-out capacitor C2, potential-divider network 206, transformer T1, secondary diode D6 and output capacitance C3.Wherein, output capacitance C3 can be configured in parallel with the LED load.
Furthermore, rectifier bridge carries out rectification to the AC signal (AC INPUT) of input, obtains input signal Vin, and the output of this rectifier bridge connects the first end of input capacitance Cin, the second end ground connection of this input capacitance Cin.This rectifier bridge can comprise diode D1～D4, wherein, the negative pole of the cathode connecting diode D2 of diode D1 also connects positive input terminal, the negative pole of diode D1 connects the negative pole of diode D3 and connects the first end of input capacitance Cin, the plus earth of the positive pole of diode D2 and diode D4, negative pole and the negative input end of the cathode connecting diode D4 of diode D3.
Rectifier bridge and input capacitance Cin have formed input rectification circuit, it will be appreciated by those skilled in the art that this former limit control LED drive circuit also can not comprise rectifier bridge and input capacitance Cin, for example can adopt external input rectification circuit.
The first end of the first capacitor C 1 connects the power port VCC of PFC constant-current control circuit 200, and the second end of the first capacitor C 1 connects the ground port GND of PFC constant-current control circuit 200.The first end of the first resistance R 1 connects the sample port CS of PFC constant-current control circuit 200, and the second end of the first resistance R 1 connects the ground port GND of PFC constant-current control circuit 200.One end of potential-divider network 206 connects the ground port GND of PFC constant-current control circuit 200, other end ground connection, and potential-divider network 206 voltage between port GND and ground over the ground carries out dividing potential drop, and its output connects the feedback port FB of PFC constant-current control circuit 200.The different name end of the former limit winding NP of transformer T1 connects the ground port GND of PFC constant-current control circuit 200, the Same Name of Ends ground connection of former limit winding NP.The Same Name of Ends of the secondary winding NS of the anodal connection transformer T1 of secondary diode D6.The first end of output capacitance C3 connects the negative pole of secondary diode D6, and the second end of output capacitance C3 connects the different name end of secondary winding NS.The first end of building-out capacitor C2 connects the compensation port COMP of PFC constant-current control circuit 200, and the second end of building-out capacitor C2 connects the ground port GND of PFC constant-current control circuit 200.
As a nonrestrictive example, this potential-divider network 206 can comprise the second resistance R 2 and the 3rd resistance R 3.Wherein, the first end of the second resistance R 2 connects the ground port GND of PFC constant-current control circuit 200, and the second end of the second resistance R 2 connects the feedback port FB of PFC constant-current control circuit 200; The first end of the 3rd resistance R 3 connects the second end of the second resistance R 2, the second end ground connection of the 3rd resistance R 3.
Further, PFC constant-current control circuit 200 mainly comprises: supply module 201, power tube M2, source drive pipe M1, constant-current control module 203, base modules 204 and driver module 205, its have power port VCC, port GND, input port DRAIN, sample port CS, feedback port FB, compensation port COMP.As a preferred embodiment, ground port GND adopts and connects floatingly, is not connected to power supply ground, but is connected to the different name end of the former limit winding NP of transformer T1.
Wherein, supply module 201 is for detection of the supply voltage of power port VCC, power port VCC and input port DRAIN are electrically connected to the connection when this supply voltage is less than this preset value between deenergization port VCC and input port DRAIN when this supply voltage is greater than preset value.
As a preferred embodiment, supply module 201 comprises power supply control module 202 and depletion type nmos transistor M3.Wherein, the input of power supply control module 202 connects power port VCC, supply voltage for detection of power port VCC, at this supply voltage during higher than this preset value, the output signal DRV3 of the output of power supply control module 202 is logic high, at supply voltage, during lower than this preset value, the output signal DRV3 of the output of power supply control module 202 is logic low.The drain electrode of depletion type nmos transistor M3 connects input port DRAIN, the source electrode of depletion type nmos transistor M3 connects power port VCC, the grid of depletion type nmos transistor M3 connects the output of power supply control module 202, and namely the output signal DRV3 of power supply control module 202 is for controlling the turn-on and turn-off of depletion type nmos transistor M3.When depletion type nmos transistor M3 conducting, input port DRAIN and power port VCC conducting; When depletion type nmos transistor M3 disconnects, the connection between input port DRAIN and power port VCC also is disconnected.
Those skilled in the art are to be understood that, except above-mentioned preferred embodiment, supply module 201 can also adopt other suitable implementations, for example depletion type nmos transistor M3 is replaced by the transistor of other types, and the output signal of corresponding adjustment power supply control module 202, thereby realize similar function.
The drain electrode of power tube M2 connects input port DRAIN, and the grid of power tube M2 connects power port VCC.The drain electrode of source drive pipe M1 connects the source electrode of power tube M2, and the source electrode of source drive pipe M1 connects sample port CS.
The first input end of constant-current control module 203 receives sampled signal from sample port CS, the second input of constant-current control module 203 is from feedback port FB receiving feedback signals, the 3rd input of constant-current control module 203 receives compensating signal from compensation port COMP, calculate output current and ON time and produce according to the sampled signal received, feedback signal and compensating signal and drive signal, this driving signal transfers to the grid of source drive pipe M1 via driver module 205, in order to control the turn-on and turn-off of source drive pipe M1.Wherein, driver module 205, for strengthening the driving force that drives signal, drives the driving signal DRV1 after signal is converted to adjusting after driver module 205.
The input of base modules 204 connects power port VCC, for generation of multiple reference signal, for other modules, uses.
PFC constant-current control circuit 200 can adopt the mode of integrated circuit (IC) to realize, namely by source drive pipe M1, and power tube M2, depletion type nmos transistor M3 is integrated in a chip.
The operation principle that LED drive circuit is controlled on former limit shown in Fig. 2 is as follows: source drive pipe M1, and power tube M2, depletion type nmos transistor M3 is three multiple tubes, forms power stage circuit, wherein source drive pipe M1 and power tube M2 form source electrode drive circuit.Wherein, depletion type nmos transistor M3 is the high voltage supply pipe, for giving power port VCC power supply.The low-voltage driving pipe that source drive pipe M1 is source electrode drive circuit.When source drive pipe M1 conducting, the drain electrode of source drive pipe M1 is logic low, the grid of power tube M2 is the supply voltage on power port VCC, the gate source voltage VGS of power tube M2 is high like this, power tube M2 conducting, source drive pipe M1 and power tube M2 are after conducting, input voltage vin is by power tube M2, source drive pipe M1, the first resistance R 1, the former limit winding NP of transformer T1 forms loop to ground, transformer T1 storage power, the ground port GND of PFC constant-current control circuit 200 is logic high, approach input voltage vin, feedback signal on the feedback port FB relatively voltage of port GND is negative level.Constant-current control module 203 detects the sampled signal of sample port CS and the feedback signal of feedback port FB, and carry out loop compensation control by the compensating signal of compensation port COMP, when this ON time of the ON time Ton(Ton that reaches loop and control the to need ON time that is source drive pipe M1) time, the driving signal of constant-current control module 203 outputs is cut-off signals, the driving signal output logic low level that for example driver module 205 is exported, source drive pipe M1 turn-offs, correspondingly, power tube M2 turn-offs, feedback signal on feedback port FB is positive level with respect to the voltage of ground port GND, can detect by this feedback signal the ON time of secondary diode D6.The secondary winding NS of transformer T1 forms discharge loop by secondary diode D6, output capacitance C3 and LED load.Simultaneously, constant-current control module 203, by the sampled signal that detects sample port CS, the feedback signal of feedback port FB, calculates output current, and controls and make constant output current by system, realizes the purpose of constant current.
Power supply control module 202 is for detection of the supply voltage of power port VCC, for example, when the supply voltage on power port VCC is greater than a preset value (reference voltage that base modules 204 provides), output signal DRV3 can be logic high, make depletion type nmos transistor M2 stop power supply, PFC constant-current control circuit 200 is by being stored in the energy power supply on the first capacitor C 1; Supply voltage on power port VCC for example, lower than certain value (reference voltage that base modules 204 provides), output signal DRV3 can be logic low, depletion type nmos transistor M3 starts conducting, gives power port VCC and the first capacitor C 1 charging.In the source electrode drive circuit formed due to source drive pipe M1 and power tube M2, the driving loss of power tube M2 does not need power port VCC to provide, make the power consumption of whole PFC constant-current control circuit less, and make high voltage supply become possibility, even use the high-voltage power pipe M2 that drive current is required to very large relatively high power, also can work.
By upper, the scheme of the present embodiment adopts three multiple tubes (source drive pipe M1, power tube M2 and depletion type nmos transistor M3) to form the source drive structure of high voltage supply, power port VCC connects the grid of power tube M2, without power port, VCC provides gate drive current, make the power consumption of power port VCC less, can directly power with high pressure, save auxiliary winding power supply; In addition, whole former limit is controlled LED drive circuit and is connected to floating ground control mode, the ground port of PFC constant-current control circuit 200 is connected to former limit winding NP, thereby can detect by former limit winding NP the ON time of secondary diode, thereby can save auxiliary winding testing circuit, so just can thoroughly save auxiliary winding, be conducive to reduce costs.In addition, this scheme also saved in the lump starting resistance R1 conventional in the prior art and for electric diode D5(with reference to Fig. 1), be conducive to reduce the peripheral circuit cost.
In addition, LED drive circuit is controlled without adopting auxiliary winding power supply in the former limit of High Power Factor without auxiliary winding of this programme, thereby make between the voltage range of power port VCC of the scope of output voltage and PFC constant-current control circuit 200 and there is no parasitic corresponding relation, thereby be conducive to add wide output voltage range, can improve the compatibility of complete machine.
What should be understood that is that above-described embodiment is just to explanation of the present utility model; rather than to restriction of the present utility model; any utility model do not exceeded in the utility model connotation scope is created; include but not limited to change to local structure, to the replacement of type or the model of components and parts; and the replacement of other unsubstantialities or modification, within all falling into the utility model protection range.
Claims (7)
1. a PFC constant-current control circuit, is characterized in that, have power port, port, sample port, input port and feedback port, this PFC constant-current control circuit comprises:
For detection of the supply voltage of described power port and according to this supply voltage conducting or disconnect the supply module of the connection between described power port and input port;
Power tube, its drain electrode connects described input port, and its grid connects described power port;
The source drive pipe, its drain electrode connects the source electrode of described power tube, and its source electrode connects described sample port;
Constant-current control module, its first input end is connected with described sample port and receives sampled signal from described sample port, its second input is connected with described feedback port and from described feedback port receiving feedback signals, its output output drive signal, this driving signal is associated with described sampled signal and feedback signal, this driving signal transfers to the grid of described source drive pipe via driver module, in order to control the turn-on and turn-off of described source drive pipe.
2. PFC constant-current control circuit according to claim 1, is characterized in that, described supply module comprises:
The power supply control module, its input connects described power port, for detection of the supply voltage of described power port;
Depletion type nmos transistor, its drain electrode connects described input port, and its source electrode connects described power port, and its grid connects the output of described power supply control module.
3. PFC constant-current control circuit according to claim 1, it is characterized in that, described PFC constant-current control circuit also has the compensation port, this compensation port connects the first end of compensating network, the second end of this compensating network connects described ground port, described constant-current control module also receives compensating signal from this compensation port, and produces described driving signal according to this compensating signal, sampled signal and feedback signal.
4. PFC constant-current control circuit according to claim 1, is characterized in that, also comprises:
Base modules, its input connects described power port, in order to produce multiple reference signal for described supply module and/or constant-current control module.
5. LED drive circuit is controlled on the former limit of the auxiliary winding of nothing, it is characterized in that, comprising:
The described PFC constant-current control circuit of any one in claim 1 to 4, its input port receives input voltage;
The first electric capacity, its first end connects the power port of described PFC constant-current control circuit, and its second end connects the ground port of described PFC constant-current control circuit;
The first resistance, its first end connects the sample port of described PFC constant-current control circuit, and its second end connects the ground port of described PFC constant-current control circuit;
Potential-divider network, carry out dividing potential drop to the ground port of PFC constant-current control circuit and the voltage between ground, and its output connects the feedback port of described PFC constant-current control circuit;
Transformer, the different name end of its former limit winding connects the ground port of described PFC constant-current control circuit, the Same Name of Ends ground connection of its former limit winding;
The secondary diode, its anodal Same Name of Ends that connects the secondary winding of described transformer;
Output capacitance, its first end connects the negative pole of described secondary diode, and its second end connects the different name end of the secondary winding of described transformer.
6. LED drive circuit is controlled on former limit according to claim 5, it is characterized in that, described potential-divider network comprises:
The second resistance, its first end connects the ground port of described PFC constant-current control circuit, and its second end connects the feedback port of described PFC constant-current control circuit;
The 3rd resistance, its first end connects the second end of described the second resistance, its second end ground connection.
7. LED drive circuit is controlled on former limit according to claim 5, it is characterized in that, also comprises:
Rectifier bridge, carry out rectification to AC signal and produce described input signal;
Input capacitance, its first end connects the output of described rectifier bridge, its second end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320480163.5U CN203387740U (en) | 2013-08-07 | 2013-08-07 | Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320480163.5U CN203387740U (en) | 2013-08-07 | 2013-08-07 | Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof |
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| CN203387740U true CN203387740U (en) | 2014-01-08 |
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| CN201320480163.5U Expired - Fee Related CN203387740U (en) | 2013-08-07 | 2013-08-07 | Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN106332390A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Non-isolated LED constant-current driver chip, circuit and method |
-
2013
- 2013-08-07 CN CN201320480163.5U patent/CN203387740U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN103354690B (en) * | 2013-08-07 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN106332390A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Non-isolated LED constant-current driver chip, circuit and method |
| CN106332390B (en) * | 2015-06-30 | 2019-03-12 | 华润矽威科技（上海）有限公司 | A kind of non-isolated LED constant current driving chip, circuit and method |
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