CN103354690B - Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof - Google Patents
Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof Download PDFInfo
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Abstract
The invention provides an auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof. The LED driving circuit comprises the PFC constant-current control circuit, a first capacitor, a first resistor, a potential-divider network, a transformer, a secondary side diode and an output capacitor, wherein the first end of the first capacitor is connected with a power port of the PFC constant-current control circuit, and the second end of the first capacitor is connected with a grounding port of the PFC constant-current control circuit; the first end of the first resistor is connected with a sampling port of the PFC constant-current control circuit, and the second end of the first resistor is connected with the grounding port of the PFC constant-current control circuit; the potential-divider network is used for dividing voltage between the grounding port and the ground, and the output end of the potential-divider network is connected with a feedback port of the PFC constant-current control circuit; a synonym terminal of a primary side winding is connected with a grounding port of the transformer, and the dotted terminal of the primary side winding is grounded; the positive pole of the secondary side diode is connected with the dotted terminal of the secondary side winding; the first end of the output capacitor is connected with the negative pole of the secondary side diode, and the second end of the output capacitor is connected with the synonym terminal of the secondary side winding. The auxiliary winding is omitted, the cost is reduced, the output voltage range is enlarged, and the compatibility of the whole machine is improved.
Description
Technical field
The present invention relates to LED drive circuit technology, particularly relate to a kind of nothing and assist the former limit of winding to control LED drive circuit and PFC constant-current control circuit thereof.
Background technology
Fig. 1 is that traditional former limit of High Power Factor controls LED drive circuit system, and comprising: rectification circuit, this rectification circuit comprises diode D1 ~ D4 and input capacitance Cin; Start and power supply circuits, this startup and power supply circuits comprise resistance R1, electric capacity C1, auxiliary winding power diode D5; Transformer T1, this transformer T1 comprise former limit winding NP, vice-side winding NS and auxiliary winding NA; Metal-oxide-semiconductor M1; Divider resistance R2 and R3; Building-out capacitor C2; Sampling resistor R4; Export sustained diode 6; Output capacitance C3; LED load and power factor correction (PFC) control circuit 100.Wherein, one end of resistance R1 receives input voltage vin, and the other end of resistance R1 is connected with one end of electric capacity C1, auxiliary one end of winding power diode D5 and the power pin VCC of control circuit 100; The other end ground connection of electric capacity C1, the auxiliary winding NA of another termination transformer T1 of auxiliary winding power diode D5 and one 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 be connected with one end of divider resistance R3, the other end ground connection of divider resistance R3.One end of the former limit winding NP of transformer T1 receives 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 be connected with one end of divider resistance R3, the other end ground connection of divider resistance R3.One end of sampling resistor R4 connects the source electrode of metal-oxide-semiconductor M1, other end ground connection.
Wherein, one end that constant-current control module 101 meets sampling pin CS, feedback pin FB and compensation pins COMP, compensation pins COMP meet electric capacity C2 of PFC control circuit 100, the other end ground connection of electric capacity C2; 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.One termination of the vice-side winding NS of transformer T1 exports the anode of sustained diode 6, the negative terminal exporting sustained diode 6 connects one end of output capacitance C3, and be connected with the anode of LED load, the other end of output capacitance C3 and the negative terminal of LED load link together.
With reference to figure 1, the operation principle that the former limit of this High Power Factor controls LED drive circuit system 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 rises by zero, the voltage rise of sampling pin CS, 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 the signal amplitude on detection sampling pin CS and by feedback pin FB detection secondary side diode ON time, calculate output current, then ON time is controlled by calculating, after reaching the ON time of system requirements, drive pin DRV output logic low level, transformer T1 is discharged by secondary, energy conduction to output.Whole system, by detecting the voltage of sampling pin CS and feedback pin FB, is controlled by loop, makes constant output current, and have higher power factor value.Wherein, compensation pins COMP connected system compensating network, maintains the stable of system by peripheral electric capacity or resistance-capacitance network.
When circuit shown in Fig. 1 normally works, power supply circuits are powered to PFC control circuit 100 by auxiliary winding NA, auxiliary winding power diode D5 and electric capacity C1, and feedback pin FB is by auxiliary winding NA and divider resistance R2, R3 sense switch signal, for transferring to PFC control circuit 100, therefore in such a system, auxiliary winding NA is absolutely necessary, and needs to be used for power supply and input.
The auxiliary winding NA of transformer T1 can take certain cost when producing, auxiliary winding power diode D5 and resistance R1 also can take certain cost, and the number of turn of auxiliary winding NA needs to match with the number of turn of vice-side 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 scope of output voltage and the voltage range of power port VCC have certain corresponding relation, output voltage range can be caused to accomplish wide-voltage range so power with auxiliary winding NA, be unfavorable for accomplishing compatibility to the product of different output voltage specification.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nothing and assists the former limit of winding to control LED drive circuit and PFC constant-current control circuit thereof, can save auxiliary winding, be conducive to reducing costs, improve output voltage range, improve the compatibility of complete machine.
For solving the problems of the technologies described above, the invention 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:
Supply module, for detecting the supply voltage of described power port, connecting described power port and input port when this supply voltage is greater than preset value, disconnecting the connection of described power port and input port when this supply voltage is less than this preset value;
Power tube, its drain electrode connects described input port, and its grid connects described power port;
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, sampled signal is received from described sample port, from described feedback port receiving feedback signals, calculate output current and ON time according to described sampled signal and feedback signal and produce drive singal, this drive singal 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 one embodiment of present invention, described supply module comprises:
Power control module, its input connects described power port, for detecting the supply voltage of described power port, when described supply voltage is higher than this preset value, its output output logic high level, when described supply voltage is 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 control module.
According to one embodiment of present invention, described PFC constant-current control circuit also has compensation port, this compensation port connects the first end of compensating network, second end of this compensating network connects described ground port, described constant-current control module also from this compensation port accepts compensating signal, and produces described drive singal according to this compensating signal, sampled signal and feedback signal.
According to one embodiment of present invention, this PFC constant-current control circuit also comprises: base modules, and its input connects described power port, in order to produce multiple reference signal for described supply module and/or constant-current control module.
Present invention also offers a kind of nothing assists the former limit of winding to control LED drive circuit, comprising:
PFC constant-current control circuit described in above-mentioned any one, its input port receives input voltage;
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;
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 voltage between the ground port of PFC constant-current control circuit and ground, 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;
Secondary side diode, its positive pole connects the Same Name of Ends of the vice-side winding of described transformer;
Output capacitance, its first end connects the negative pole of described secondary side diode, and its second end connects the different name end of the vice-side winding of described transformer.
According to one embodiment of present invention, described potential-divider network comprises:
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;
3rd resistance, its first end connects the second end of described second resistance, its second end ground connection.
According to one embodiment of present invention, this former limit control LED drive circuit also comprises:
Rectifier bridge, carries out rectification to AC signal and produces described input signal;
Input capacitance, its first end connects the output of described rectifier bridge, its second end ground connection.
According to one embodiment of present invention, when described source drive pipe conducting, the drain electrode of described source drive pipe is logic low and the grid of described power tube is supply voltage, make described power tube conducting, described input voltage via described power tube, source drive pipe, the first resistance, transformer former limit winding to form loop, this transformer storage power and described ground port is logic high, the feedback signal of described feedback port is logic negative level relative to this ground port; Described constant-current control module exports the drive singal for turning off described source drive pipe according to required ON time, described source drive pipe and power tube are turned off, described feedback signal is logic positive level relative to ground port, described constant-current control module detects the ON time of described secondary side diode according to this feedback signal, and calculate output current in conjunction with described sampled signal, by control described source drive pipe again conducting realize the constant of output current.
Compared with prior art, the present invention has the following advantages:
The former limit without auxiliary winding of the embodiment of the present invention controls LED drive circuit and high pressure can be adopted directly to power, without the need to passing through auxiliary winding, and PFC constant-current control circuit connects for floating ground control mode, feedback signal can be detected by former limit winding obtain, also without the need to passing through auxiliary winding, thus can thoroughly save auxiliary winding, also eliminate the resistance for starting simultaneously in the lump and supply electric diode, peripheral circuit cost can be reduced, and save the scope that auxiliary winding is conducive to adding wide output voltage, improve the compatibility of complete machine.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram that in prior art, the former limit of a kind of High Power Factor controls LED drive circuit system;
Fig. 2 is the electrical block diagram of the former limit control LED drive circuit without auxiliary winding of the embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit the scope of the invention with this.
With reference to figure 2, the former limit of the present embodiment controls LED drive circuit and comprises: rectifier bridge, input capacitance Cin, PFC constant-current control circuit 200, first electric capacity C1, the first resistance R1, building-out capacitor C2, potential-divider network 206, transformer T1, secondary side diode D6 and output capacitance C3.Wherein, output capacitance C3 can be configured in parallel with LED load.
Furthermore, the AC signal (AC INPUT) of rectifier bridge to input carries out rectification, 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 positive pole of diode D2 and the plus earth of diode D4, the negative pole of the cathode connecting diode D4 of diode D3 and negative input end.
Rectifier bridge and input capacitance Cin define input rectification circuit, it will be appreciated by those skilled in the art that this former limit controls LED drive circuit and also can not comprise rectifier bridge and input capacitance Cin, such as, can adopt external input rectification circuit.
The first end of the first electric capacity C1 connects the power port VCC of PFC constant-current control circuit 200, and second end of the first electric capacity C1 connects the ground port GND of PFC constant-current control circuit 200.The first end of the first resistance R1 connects the sample port CS of PFC constant-current control circuit 200, and second end of the first resistance R1 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 the voltage of potential-divider network 206 over the ground between port GND and 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 vice-side winding NS of the positive pole connection transformer T1 of secondary side diode D6.The first end of output capacitance C3 connects the negative pole of secondary side diode D6, and second end of output capacitance C3 connects the different name end of vice-side winding NS.The first end of building-out capacitor C2 connects the compensation port COMP of PFC constant-current control circuit 200, and 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 R2 and the 3rd resistance R3.Wherein, the first end of the second resistance R2 connects the ground port GND of PFC constant-current control circuit 200, and second end of the second resistance R2 connects the feedback port FB of PFC constant-current control circuit 200; The first end of the 3rd resistance R3 connects second end of the second resistance R2, the second end ground connection of the 3rd resistance R3.
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, compensate port COMP.As a preferred embodiment, ground port GND adopts floating connection, 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 detecting the supply voltage of power port VCC, when this supply voltage is greater than preset value, power port VCC and input port DRAIN is electrically connected, the connection when this supply voltage is less than this preset value between deenergization port VCC and input port DRAIN.
As a preferred embodiment, supply module 201 comprises power control module 202 and depletion type nmos transistor M3.Wherein, the input of power control module 202 connects power port VCC, for detecting the supply voltage of power port VCC, when this supply voltage is higher than this preset value, the output signal DRV3 of the output of power control module 202 is logic high, when supply voltage is lower than this preset value, the output signal DRV3 of the output of power 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 control module 202, and namely the output signal DRV3 of power 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 is also disconnected.
Those skilled in the art are to be understood that, except above-mentioned preferred embodiment except, supply module 201 can also adopt other suitable implementations, such as depletion type nmos transistor M3 is replaced by the transistor of other types, and the output signal of corresponding adjustment power control module 202, thus 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.
Constant-current control module 203 receives sampled signal from sample port CS, from feedback port FB receiving feedback signals, compensating signal is received from compensation port COMP, calculate output current and ON time according to the sampled signal received, feedback signal and compensating signal and produce drive singal, this drive singal 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 is for strengthening the driving force of drive singal, and drive singal is converted to the drive singal DRV1 after adjustment after driver module 205.
The input of base modules 204 connects power port VCC, uses for other modules for generation of multiple reference signal.
PFC constant-current control circuit 200 can adopt the mode of integrated circuit (IC) to realize, and namely by source drive pipe M1, power tube M2, depletion type nmos transistor M3 is integrated in a chip.
The operation principle that former limit shown in Fig. 2 controls LED drive circuit is as follows: source drive pipe M1, power tube M2, depletion type nmos transistor M3 are three multiple tubes, forms power stage circuit, and wherein source drive pipe M1 and power tube M2 forms source electrode drive circuit.Wherein, depletion type nmos transistor M3 is high voltage supply pipe, powers for giving power port VCC.Source drive pipe M1 is the low-voltage driving pipe of source electrode drive circuit.When the M1 conducting of source drive pipe, 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 such power tube M2 is high, power tube M2 conducting, source drive pipe M1 and power tube M2 is after conducting, input voltage vin is by power tube M2, source drive pipe M1, first resistance R1, 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, close to input voltage vin, the voltage of the relatively port GND of the feedback signal on feedback port FB 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 compensating port COMP, ON time when this ON time Ton of ON time Ton(reaching loop control needs is source drive pipe M1) time, the drive singal that constant-current control module 203 exports is cut-off signals, the drive singal output logic low level that such as driver module 205 exports, source drive pipe M1 turns off, correspondingly, power tube M2 turns off, feedback signal on feedback port FB is positive level relative to the voltage of ground port GND, the ON time of secondary side diode D6 can be detected by this feedback signal.The vice-side winding NS of transformer T1 forms discharge loop by secondary side diode D6, output capacitance C3 and LED load.Meanwhile, constant-current control module 203, by detecting the sampled signal of sample port CS, the feedback signal of feedback port FB, calculates output current, and makes constant output current by Systematical control, realize the object of constant current.
Power control module 202 is for detecting the supply voltage of power port VCC, when the supply voltage on power port VCC is greater than a preset value (reference voltage that such as base modules 204 provides), output signal DRV3 can be logic high, depletion type nmos transistor M2 is stopped power supply, and PFC constant-current control circuit 200 is powered by the energy be stored on the first electric capacity C1; When the supply voltage on power port VCC is lower than certain value (reference voltage that such as base modules 204 provides), output signal DRV3 can be logic low, depletion type nmos transistor M3 starts conducting, charges to power port VCC and the first electric capacity C1.Because in the source electrode drive circuit that source drive pipe M1 and power tube M2 forms, 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 if use high-voltage power pipe M2 drive current being required to very large relatively high power, also can normally 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 define the source drive structure of high voltage supply, power port VCC connects the grid of power tube M2, gate drive current is provided without the need to power port VCC, make the power consumption of power port VCC less, directly can power with high pressure, eliminate auxiliary winding power; In addition, whole former limit controls LED drive circuit and connects for floating ground control mode, the ground port of PFC constant-current control circuit 200 is connected to former limit winding NP, thus the ON time of secondary side diode can be detected by former limit winding NP, thus auxiliary winding testing circuit can be saved, so just can thoroughly save auxiliary winding, be conducive to reducing costs.In addition, the program also eliminates starting resistance R1 conventional in prior art in the lump and supplies electric diode D5(with reference to Fig. 1), be conducive to reducing peripheral circuit cost.
In addition, the former limit of High Power Factor without auxiliary winding of this programme controls LED drive circuit without the need to adopting auxiliary winding power, thus make between the voltage range of the power port VCC of the scope of output voltage and PFC constant-current control circuit 200, to there is no parasitic corresponding relation, thus be conducive to adding wide output voltage range, the compatibility of complete machine can be improved.
It is to be understood that above-described embodiment is just to explanation of the present invention; instead of limitation of the present invention; any innovation and creation do not exceeded in spirit of the present invention; include but not limited to the replacement of the change to local structure, the type to components and parts or model; and the replacement of other unsubstantialities or amendment, all fall within scope.
Claims (8)
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:
Supply module, for detecting the supply voltage of described power port, connecting described power port and input port when this supply voltage is greater than preset value, disconnecting the connection of described power port and input port when this supply voltage is less than this preset value;
Power tube, its drain electrode connects described input port, and its grid connects described power port;
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, sampled signal is received from described sample port, from described feedback port receiving feedback signals, calculate output current and ON time according to described sampled signal and feedback signal and produce drive singal, this drive singal 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;
Wherein, described power port is for connecting the first end of the first electric capacity, described ground port is for connecting the second end of described first electric capacity, and when described supply voltage is greater than described preset value, described PFC constant-current control circuit relies on the energy be stored on described first electric capacity to power; When described supply voltage is lower than described preset value, input voltage gives described power port and the first capacitor charging by described input port.
2. PFC constant-current control circuit according to claim 1, is characterized in that, described supply module comprises:
Power control module, its input connects described power port, for detecting the supply voltage of described power port, when described supply voltage is higher than this preset value, its output output logic high level, when described supply voltage is 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 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 compensation port, this compensation port connects the first end of compensating network, second end of this compensating network connects described ground port, described constant-current control module also from this compensation port accepts compensating signal, and produces described drive singal 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 comprise:
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. nothing assists the former limit of winding to control a LED drive circuit, it is characterized in that, comprising:
PFC constant-current control circuit according to any one of Claims 1-4, its input port receives input voltage;
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;
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 voltage between the ground port of PFC constant-current control circuit and ground, 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;
Secondary side diode, its positive pole connects the Same Name of Ends of the vice-side winding of described transformer;
Output capacitance, its first end connects the negative pole of described secondary side diode, and its second end connects the different name end of the vice-side winding of described transformer.
6. former limit according to claim 5 controls LED drive circuit, and it is characterized in that, described potential-divider network comprises:
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;
3rd resistance, its first end connects the second end of described second resistance, its second end ground connection.
7. former limit according to claim 5 controls LED drive circuit, it is characterized in that, also comprises:
Rectifier bridge, carries out rectification to AC signal and produces described input voltage;
Input capacitance, its first end connects the output of described rectifier bridge, its second end ground connection.
8. former limit according to claim 5 controls LED drive circuit, it is characterized in that, when described source drive pipe conducting, the drain electrode of described source drive pipe is logic low and the grid of described power tube is supply voltage, make described power tube conducting, described input voltage via described power tube, source drive pipe, the first resistance, transformer former limit winding to form loop, this transformer storage power and described ground port is logic high, the feedback signal of described feedback port is logic negative level relative to this ground port; Described constant-current control module exports the drive singal for turning off described source drive pipe according to required ON time, described source drive pipe and power tube are turned off, described feedback signal is logic positive level relative to ground port, described constant-current control module detects the ON time of described secondary side diode according to this feedback signal, and calculate output current in conjunction with described sampled signal, by control described source drive pipe again conducting realize the constant of output current.
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| CN201310341321.3A CN103354690B (en) | 2013-08-07 | 2013-08-07 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
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| CN201310341321.3A CN103354690B (en) | 2013-08-07 | 2013-08-07 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
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| CN103872921B (en) * | 2014-03-13 | 2016-02-10 | 辉芒微电子（深圳）有限公司 | Constant-current switch power source and control method thereof |
| CN103944393B (en) * | 2014-03-21 | 2016-04-27 | 辉芒微电子（深圳）有限公司 | A kind of constant-current switch power source |
| CN104159357B (en) * | 2014-06-20 | 2016-03-30 | 东南大学 | The control method of a kind of LED illumination circuit output current effective value and power factor and control system thereof |
| CN104638946A (en) * | 2015-02-11 | 2015-05-20 | 深圳市华芯邦科技有限公司 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
| CN105577007A (en) * | 2016-03-04 | 2016-05-11 | 杭州士兰微电子股份有限公司 | Primary-side-controlled switch power supply and control method |
| CN106253716A (en) * | 2016-08-08 | 2016-12-21 | 杭州士兰微电子股份有限公司 | The Switching Power Supply of primary-side-control and control method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202009514U (en) * | 2011-03-02 | 2011-10-12 | 成都创芯微科技有限公司 | Separation-type AC-DC (alternating current-direct current) flyback LED driving power source |
| CN202178706U (en) * | 2011-08-03 | 2012-03-28 | 深圳市富满电子有限公司南山分公司 | AC-DC power conversion chip and power conversion circuit |
| CN202524299U (en) * | 2012-03-30 | 2012-11-07 | 江苏晟芯微电子有限公司 | Primary edge control type switch power supply with high-precision constant-voltage/constant-current output and high-pulse-frequency (PF) value |
| CN202535588U (en) * | 2012-02-29 | 2012-11-14 | 成都能元科技有限公司 | LED high-efficient constant-current driving power supply |
| CN202617462U (en) * | 2012-06-15 | 2012-12-19 | 福建捷联电子有限公司 | Secondary side controlled light-emitting diode (LED) driving circuit with half-bridge structure |
| CN102892239A (en) * | 2012-10-31 | 2013-01-23 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit |
| CN202907293U (en) * | 2012-10-31 | 2013-04-24 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing same |
| CN203086823U (en) * | 2013-02-06 | 2013-07-24 | 杭州士兰微电子股份有限公司 | Non-isolated LED driving circuit without auxiliary winding power supply |
| CN203387740U (en) * | 2013-08-07 | 2014-01-08 | 杭州士兰微电子股份有限公司 | Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202353846U (en) * | 2011-06-22 | 2012-07-25 | 罗姆股份有限公司 | Power supply for illumination of light-emitting diode (LED) |
-
2013
- 2013-08-07 CN CN201310341321.3A patent/CN103354690B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202009514U (en) * | 2011-03-02 | 2011-10-12 | 成都创芯微科技有限公司 | Separation-type AC-DC (alternating current-direct current) flyback LED driving power source |
| CN202178706U (en) * | 2011-08-03 | 2012-03-28 | 深圳市富满电子有限公司南山分公司 | AC-DC power conversion chip and power conversion circuit |
| CN202535588U (en) * | 2012-02-29 | 2012-11-14 | 成都能元科技有限公司 | LED high-efficient constant-current driving power supply |
| CN202524299U (en) * | 2012-03-30 | 2012-11-07 | 江苏晟芯微电子有限公司 | Primary edge control type switch power supply with high-precision constant-voltage/constant-current output and high-pulse-frequency (PF) value |
| CN202617462U (en) * | 2012-06-15 | 2012-12-19 | 福建捷联电子有限公司 | Secondary side controlled light-emitting diode (LED) driving circuit with half-bridge structure |
| CN102892239A (en) * | 2012-10-31 | 2013-01-23 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit |
| CN202907293U (en) * | 2012-10-31 | 2013-04-24 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing same |
| CN203086823U (en) * | 2013-02-06 | 2013-07-24 | 杭州士兰微电子股份有限公司 | Non-isolated LED driving circuit without auxiliary winding power supply |
| CN203387740U (en) * | 2013-08-07 | 2014-01-08 | 杭州士兰微电子股份有限公司 | Primary control LED drive circuit without auxiliary winding and PFC constant current control circuit thereof |
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| CN103354690A (en) | 2013-10-16 |
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