CN103354690A - 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 the led drive circuit technology, relate in particular to former limit control led drive circuit and the PFC constant-current control circuit thereof of the auxiliary winding of a kind of nothing.
Background technology
Fig. 1 is the traditional former limit control of High Power Factor led drive circuit system, and comprising: rectification circuit, this rectification circuit comprise 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 comprise 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 links to each other 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 link to each other the other end ground connection of divider resistance R3 with the end 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 link to each other the other end ground connection of divider resistance R3 with the end 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 link to each other with the anode of LED load, the negative terminal of the other end of output capacitance C3 and LED load links together.
With reference to figure 1, the operation principle of the former limit of this High Power Factor control 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 begins 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 detecting the signal amplitude on the sampling pin CS and passing through feedback pin FB and detect the secondary diode current flow time, calculate output current, then by calculating the control ON time, reach the ON time of system requirements after, drive pin DRV output logic low level, transformer T1 discharges by secondary, energy conduction to output.Whole system is controlled by loop by detecting the voltage of sampling pin CS and feedback pin FB, so that constant output current, and higher power factor value is arranged.Wherein, compensation pins COMP connected system compensating network is kept Systems balanth by peripheral electric capacity or resistance-capacitance network.
When circuit shown in Figure 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, be used for transferring to PFC control circuit 100, therefore in this 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 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 compatibility.
Summary of the invention
Former limit control led drive circuit and PFC constant-current control circuit thereof that the technical problem to be solved in the present invention provides the auxiliary winding of a kind of nothing can save auxiliary winding, are conducive to reduce cost, 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 detection of the supply voltage of described power port, connects described power port and input port during greater than preset value at this supply voltage, disconnects described power port during less than this preset value at this supply voltage and is connected connection with 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, receive sampled signal from described sample port, from described feedback port receiving feedback signals, calculate output current and ON time and produce the driving signal according to 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 one embodiment of present invention, 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, 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 supply control module.
According to one embodiment of present invention, 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 one embodiment of present invention, 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 present invention also provides the former limit control led drive circuit of the auxiliary winding of a kind of nothing, comprising:
Above-mentioned each described PFC constant-current control circuit, 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 carries out dividing potential drop to the ground port of PFC constant-current control circuit and the voltage between the 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 one embodiment of present invention, described potential-divider network comprises:
The second resistance, its first end connect 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 connect the second end of described the 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 that the grid of logic low and described power tube is supply voltage, so that described power tube conducting, described input voltage forms the loop via the former limit winding of described power tube, source drive pipe, the first resistance, transformer to ground, this transformer storage power and described ground port are logic high, and the feedback signal of described feedback port is the logic negative level with respect to this ground port; Described constant-current control module is used for turn-offing the driving signal of described source drive pipe according to required ON time output, so that described source drive pipe and power tube turn-off, described feedback signal is the logic positive level with respect to the ground port, described constant-current control module detects the ON time of described secondary 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 control led drive circuit of the auxiliary winding of the nothing of the embodiment of the invention can adopt high pressure directly to power, need not through auxiliary winding, and the PFC constant-current control circuit is connected to floating ground control mode, so that can detecting by former limit winding, feedback signal obtains, also need not through auxiliary winding, thereby can thoroughly save auxiliary winding, also saved in the lump simultaneously and be used for the resistance that starts and supply 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.
Description of drawings
Fig. 1 is the electrical block diagram of the former limit control of a kind of High Power Factor led drive circuit system in the prior art;
Fig. 2 is the electrical block diagram that led drive circuit is controlled on the former limit of the auxiliary winding of nothing of the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.
With reference to figure 2, the former limit control led drive circuit of present embodiment comprises: 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 the potential-divider network 206 over the ground voltage between port GND and 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 during greater than preset value at this supply voltage, in the connection between deenergization port VCC and the input port DRAIN during less than this preset value of this supply voltage.
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, when this supply voltage is higher than this preset value, the output signal DRV3 of the output of power supply control module 202 is logic high, when supply voltage was lower than this preset value, the output signal DRV3 of the output of power supply control module 202 was 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 used for the turn-on and turn-off of control 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 disconnected, the connection between input port DRAIN and the power port VCC also was 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.
Constant-current control module 203 receives sampled signal from sample port CS, from feedback port FB receiving feedback signals, COMP receives compensating signal from the compensation port, calculate output current and ON time and produce the driving signal according to the sampled signal that receives, feedback signal and compensating 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 is used for strengthening the driving force that drives signal, drives signal through being converted to the driving signal DRV1 after the adjusting behind the 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, namely with source drive pipe M1, and power tube M2, depletion type nmos transistor M3 is integrated in the chip.
The operation principle of former limit control led drive circuit shown in Figure 2 is as follows: source drive pipe M1, and power tube M2, depletion type nmos transistor M3 are three multiple tubes, form 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, is used for powering to power port VCC.Source drive pipe M1 is the low-voltage driving pipe of 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 the 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 the 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 the loop to ground, transformer T1 storage power, the ground port GND of PFC constant-current control circuit 200 is logic high, near input voltage vin, the 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 by the compensating signal that compensates port COMP and control, when this ON time of the ON time Ton(Ton that reaches loop control needs is the ON time of 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 of driver module 205 output for example, source drive pipe M1 turn-offs, correspondingly, power tube M2 turn-offs, feedback signal on the 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 calculates output current by the sampled signal that detects sample port CS, the feedback signal of feedback port FB, and by system's control so that constant output current, realize the purpose of constant current.
Power supply control module 202 is for detection of the supply voltage of power port VCC, when the supply voltage on the power port VCC during greater than a preset value (for example base modules 204 provide a reference voltage), output signal DRV3 can be logic high, so that depletion type nmos transistor M2 stops power supply, PFC constant-current control circuit 200 is by being stored in the energy power supply on the first capacitor C 1; Certain value (for example base modules 204 provide a reference voltage) is provided supply voltage on power port VCC, output signal DRV3 can be logic low, depletion type nmos transistor M3 begins conducting, gives power port VCC and 1 charging of the first capacitor C.Because the driving loss of power tube M2 does not need power port VCC to provide in the source electrode drive circuit that source drive pipe M1 and power tube M2 form, so that the power consumption of whole PFC constant-current control circuit is less, and so that high voltage supply becomes possibility, even use the high-voltage power pipe M2 that drive current is required very large relatively high power, also can work.
By upper, the scheme of 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, need not power port VCC gate drive current is provided, so that the power consumption of power port VCC is less, can directly power with high pressure, save auxiliary winding power supply; In addition, whole former limit control led drive circuit 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 be by the ON time of former limit winding NP detection secondary diode, thereby can save auxiliary winding testing circuit, so just can thoroughly save auxiliary winding, be conducive to reduce cost.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, the former limit control of the High Power Factor of the auxiliary winding of the nothing of this programme led drive circuit need not to adopt auxiliary winding power supply, thereby so that there is no parasitic corresponding relation between the voltage range of the power port VCC of the scope of output voltage and PFC constant-current control circuit 200, 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 invention; rather than limitation of the present invention; any innovation and creation that do not exceed in the connotation scope of the present invention; include but not limited to local structure change, to the replacement of type or the model of components and parts; and the replacement of other unsubstantialities or modification, all fall within the protection range of the present invention.
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 detection of the supply voltage of described power port, connects described power port and input port during greater than preset value at this supply voltage, disconnects described power port during less than this preset value at this supply voltage and is connected connection with 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, receive sampled signal from described sample port, from described feedback port receiving feedback signals, calculate output current and ON time and produce the driving signal according to 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, 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 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. the former limit control led drive circuit of the auxiliary winding of nothing is characterized in that, comprising:
Each described PFC constant-current control circuit in the 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 carries out dividing potential drop to the ground port of PFC constant-current control circuit and the voltage between the 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 connect 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 connect the second end of described the second resistance, its second end ground connection.
7. former limit control led drive circuit according to claim 5 is characterized in that, 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.
8. led drive circuit is controlled on former limit according to claim 5, it is characterized in that, when described source drive pipe conducting, the drain electrode of described source drive pipe is that the grid of logic low and described power tube is supply voltage, so that described power tube conducting, described input voltage forms the loop via the former limit winding of described power tube, source drive pipe, the first resistance, transformer to ground, this transformer storage power and described ground port are logic high, and the feedback signal of described feedback port is the logic negative level with respect to this ground port; Described constant-current control module is used for turn-offing the driving signal of described source drive pipe according to required ON time output, so that described source drive pipe and power tube turn-off, described feedback signal is the logic positive level with respect to the ground port, described constant-current control module detects the ON time of described secondary 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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| CN103872921A (en) * | 2014-03-13 | 2014-06-18 | 辉芒微电子（深圳）有限公司 | Constant-current switching power supply and control method thereof |
| CN103944393A (en) * | 2014-03-21 | 2014-07-23 | 辉芒微电子（深圳）有限公司 | Constant current switching power source |
| CN104159357A (en) * | 2014-06-20 | 2014-11-19 | 东南大学 | Method and system for controlling output current effective value and power factor of LED lighting circuit |
| 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 |
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