CN103547041A - LED driver circuit - Google Patents
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- CN103547041A CN103547041A CN201310528655.1A CN201310528655A CN103547041A CN 103547041 A CN103547041 A CN 103547041A CN 201310528655 A CN201310528655 A CN 201310528655A CN 103547041 A CN103547041 A CN 103547041A
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Abstract
The invention provides an LED driver circuit. The LED driver circuit comprises an AC input end, a half-wave rectifying circuit, an output rectifying filtering circuit, a control module, power inductors and a switch unit, wherein the AC input end is used for inputting an alternating voltage, the half-wave rectifying circuit is used for converting the alternating voltage into a half-wave alternating voltage, the output rectifying filtering circuit is used for providing a stable drive current for an LED, the power inductors are connected with the two ends of the output rectifying filtering circuit in parallel, the switch unit is used for disconnecting or connecting the output end of the half-wave rectifying circuit and the input end of the output rectifying filtering circuit, the AC input end, the half-wave rectifying circuit, the switch unit and the output rectifying filtering circuit are connected in sequence, and the control module is respectively connected with the control end of the switch unit and the input end of the output rectifying filtering circuit, and is further coupled with the power inductors. The LED driver circuit has the advantages that accuracy of the output current is improved, and the lineation/load regulation rate is increased. In addition, due to the control mode adopted by a driver, the number of higher-harmonic components at the AC input end can be effectively reduced, and the THD of a system is reduced.
Description
Technical field
The present invention relates to power driving circuit field, a kind of especially LED drive circuit.
Background technology
Because LED drive circuit has low-cost and the simple advantage of system, its application in the illuminating product of various AC-DC has caused increasing concern.And along with energy-conserving and environment-protective are worldwide day by day concerned, people comprise that to various power supply products the power factor PF of LED illuminating product and the requirement of total harmonic distortion THD also improve constantly, and reduce total harmonic distortion THD and have very important significance in the application of modern power supply product.
As shown in Figure 4, the system of the non-isolation LED drive circuit of traditional active PFC adopts buck-boost framework.This LED drive circuit comprises rectification circuit 101, inductance 102, controller 100, switch 104, resistance R cs, output diode D1, output filter capacitor C1 etc., auxiliary winding 103 and supply network D2, C2 are to controller 100 power supplies when normal operation, and the second resistance R 2 and the second resistance R 3 are in order to detect current over-zero, and the 5th resistance R 5 and the 6th resistance R 6 are in order to detect inlet highway voltage.
When switch 104 conducting, input power is stored in power inductance 102, and now output diode D1 is anti-inclined to one side; When switch 104 turn-offs, output diode D1 conducting, input power is converted to output; Output diode D1 act as output rectification; Output filter capacitor C1 act as output filtering; Output when dummy load R1 is unloaded in order to stablize.
The non-isolation LED controller 100 principle sketches of existing active PFC as shown in Figure 5, comprise as lower module: CS sampling module 111, ZCD zero passage detection module 112, the first multiplier 113, error amplification module 114, multiplier 115, CS comparator 116, BCM control module 3117.Wherein CS sampling module detects CS crest voltage V
pK, be also peak current I
pKwith sampling resistor R
cSproduct: V
pK=I
pK* R
cS.The ZCD zero passage detection module 112 duty ratio D:D=T in order to the conducting of sense switch pipe
oN/ T, ZCD zero passage detection module 112 is output as 1-D, and inputs to integrator 113 together with Ipk, output V1=(1-D) * I
pK, with V
rEF0input to together in error amplifier 114, its result inputs to the second multiplier 115 together with MT end signal, and output V2 inputs in CS comparator 116, as the reference voltage of CS peak current, when CS reaches V2, by BCM control module 3117 on-off switching tubes 104; When ZCD zero passage detection module 112 detects inductive current and is 0, switching tube is by conducting again afterwards.By negative feedback control conducting and turn-off time, thereby obtain constant output current.
Prior art has following shortcoming:
The output current I of this LED drive circuit
ooN time T with switch 104
oNwith turn-off time T
oFFmeasured value relevant, and relevant with crest voltage sampling, these all can bring error, thereby bring impact to output accuracy and linearity/load regulation.
In addition, in the input current of the ac input end of this kind of drive circuit, contain higher harmonic components, the total harmonic distortion THD of system is higher.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect existing in prior art, provides a kind of improved LED drive circuit.
The technical scheme that technical solution problem of the present invention adopts is: a kind of LED drive circuit is provided, comprise AC input for input ac voltage, for described alternating voltage is converted to half-wave alternating voltage half-wave rectifying circuit, for to described LED, provide output rectifier and filter, the control module of stabilized driving electric current and be connected in parallel on described output rectifier and filter two ends power inductance and for turn-off or conducting described in the switch element of the output of half-wave rectifying circuit and the input of described output rectifier and filter; Described AC input, described half-wave rectifying circuit, described switch element and described output rectifier and filter connect successively; Described control module is connected with the control end of described switch element and the input of described output rectifier and filter respectively, and described control module is also coupled with described power inductance;
Described control module is for gathering the first current information of input and the electric current of the described power inductance of flowing through of described output rectifier and filter, and produce shutdown signal and send to described switch element to close to control described switch element described shutdown signal according to described the first current information, described control module is also for closing at described switch element the beginning timing of having no progeny, described control module produces and drives signal after the timing scheduled time and when the electric current of the described power inductance of flowing through is zero, send to described switch element to drive described switch element conducting described driving signal.
Preferably, described control module comprises controller, the first sample circuit, and described controller comprises the zero passage detection unit for detection of the electric current of the described power inductance of flowing through, and described zero passage detection unit is coupled by described the first sample circuit and described power inductance; Generation current zero cross signal when described zero passage detection unit inspection is zero to the electric current of the described power inductance of flowing through.
Preferably, described control module also comprises the second sample circuit, described controller also comprises control unit, line wave generator for generation of linear wave, reference voltage generation unit for generation of reference voltage, error amplifying unit and voltage comparison unit, two inputs of described error amplifying unit are connected with described reference voltage generation unit and described the second sample circuit respectively, the output of described error amplifying unit and described line wave generator are connected with two inputs of described voltage comparison unit respectively, the output of described voltage comparison unit is connected with described control unit,
Described the second sample circuit is converted into voltage signal by the first current information collecting, described voltage signal and described reference voltage are input to described error amplifying unit, described error amplifying unit calculates the difference of described voltage signal and described reference voltage and amplifies a second voltage of rear output, described second voltage is input in described voltage comparison unit together with described linear wave, and described linear wave raises since a base value is linear; When the magnitude of voltage of described linear wave surpasses described second voltage, triggering signal of described voltage comparison unit output is reset to described base value to described control unit and described linear wave.
Preferably, described controller also comprises the second control unit and timer, described timer is connected with output and described second control unit of described voltage comparison unit respectively, and described the second control unit is connected with described control unit, zero passage detection unit and described line wave generator;
Described timer starts timing while receiving described triggering signal, and after the timing scheduled time, send a timing settling signal to described the second control unit, after described zero passage detection unit generation current zero cross signal, described current zero-crossing signal is sent to described the second control unit, described the second control unit sends Continuity signal to described control unit and sends first signal to described line wave generator after receiving described current zero-crossing signal and described timing settling signal, described control unit produces and drives signal and send to described switch element to make described switch element conducting described driving signal according to described Continuity signal, described linear wave transmitter starts linear rising according to described first signal from described base value.
Preferably, described switch element is metal-oxide-semiconductor, the output that the source electrode of described metal-oxide-semiconductor is switch element, the output that the drain electrode of described metal-oxide-semiconductor is described switch element, the control end that the grid of described metal-oxide-semiconductor is described switch element.
Preferably, described the second sample circuit comprises sampling resistor, described output rectifier and filter voltage regulation resistance, the first filter capacitor, rectifier diode;
Described voltage regulation resistance and described the first filter capacitor are all in parallel with external LED, the first end of described voltage regulation resistance, the first end of described sampling resistor are all connected with an input of described error amplifying unit, the second end of described sampling resistor and the first end of described power inductance are all connected with the output of described switch element, the second end ground connection of described power inductance, the negative pole of described rectification diode is connected with the second end of described voltage regulation resistance, and the positive pole of described rectification diode is connected with the second end of described power inductance.
Preferably, described the first sample circuit comprises auxiliary winding, the second resistance, the 3rd resistance, the 4th resistance, the second filter capacitor and the second rectifier diode, and described controller comprises for electrical input, described inductance and the coupling of described power inductance;
One end of described the second resistance, one end of described inductance is all connected with the positive pole of described the second rectifier diode, the other end of described the second resistance is connected with one end of described the 3rd resistance, described the 3rd other end of resistance and the other end of described auxiliary winding is connected and be connected with the output of described switch element, the positive pole of described the second rectifier diode is connected for electrical input with described, described the 4th one end of resistance and the output of described half-wave rectifying circuit are connected, the other end of described the 4th resistance is connected for electrical input with described, one end of described the second filter capacitor is connected with the negative pole of described the second rectifier diode, the other end of described the second filter capacitor is connected with the ground voltage terminal of described controller, the input of described zero passage detection unit is connected between described the second resistance and described the 3rd resistance.
Preferably, LED drive circuit also comprises the 3rd electric capacity, and the output of switch element connects described in one end of described the 3rd electric capacity, and the other end is connected with the output of described error amplifying unit.
The technical solution adopted for the present invention to solve the technical problems is: implement LED drive circuit of the present invention, have following beneficial effect: the precision of the LED drive circuit output current that prior art provides is subject to switch element ON time T
oNwith turn-off time T
oFFthe impact of accuracy of detection and peak current detection precision, and the input current of LED drive circuit energy direct-detection output filtering rectification circuit 5 of the present invention that is to say that the input current of external LED is as feedback signal, so the output current of external LED and T
oNand T
oFFdetection irrelevant, can greatly improve precision and the linearity/load regulation of output current; Meanwhile, fixedly T of the present invention
oFFdCM control model can effectively reduce the total harmonic distortion THD in the input current of AC input.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the theory diagram of the LED drive circuit in first embodiment of the invention;
Fig. 2 is the circuit theory diagrams of the controller in the LED drive circuit shown in Fig. 1;
Fig. 3 is the circuit theory diagrams of the controller of the LED drive circuit shown in Fig. 2;
Fig. 4 is the circuit theory diagrams of the LED drive circuit in second embodiment of the invention;
Fig. 5 is the circuit theory diagrams of LED drive circuit of the prior art;
Fig. 6 is the output current of existing LED drive circuit and LED drive circuit of the present invention and the comparison diagram of input voltage relation curve;
Fig. 7 is the THD of existing LED drive circuit and LED drive circuit of the present invention and the comparison diagram of input voltage relation curve.
Embodiment
For technical characterictic of the present invention, object and effect being had more clearly, understand, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
Fig. 1 shows the LED drive circuit in first embodiment of the invention, comprise a kind of LED drive circuit, comprise AC input 1 for input ac voltage, for alternating voltage being converted to the half-wave rectifying circuit 2 of half-wave alternating voltage, for output rectifier and filter 5, the control module 3 of stabilized driving electric current being provided to LED and being connected in parallel on the power inductance L1 at output rectifier and filter 5 two ends and for turn-offing or the switch element 4 of the output of conducting half-wave rectifying circuit 2 and the input of output rectifier and filter 5; AC input 1, half-wave rectifying circuit 2, switch element 4 and output rectifier and filter 5 connect successively; Control module 3 is connected with the control end of switch element 4 and the input of output rectifier and filter 5 respectively, and control module 3 is also coupled with power inductance L1;
Control module 3 is for gathering the first current information of input and the electric current of the power inductance L1 that flows through of described output rectifier and filter 5, and produce shutdown signal and send to switch element 4 to close with control switch unit 4 shutdown signal according to the first current information, control module 3 is also for closing at switch element 4 the beginning timing of having no progeny, control module 3 produces and drives signal after the timing scheduled time and when the electric current of the power inductance L1 that flows through is zero, sends to switch element 4 with 4 conductings of driving switch unit driving signal.
LED drive circuit provided by the invention is with respect to prior art, and in existing LED drive circuit, the precision of output current is subject to switch element ON time T
oNwith turn-off time T
oFFaccuracy of detection, and the impact of peak current detection precision, and the input current of LED drive circuit energy direct-detection output filtering rectification circuit 5 of the present invention that is to say the input current of external LED, and form feedback loop, so the output current of external LED and T
oNand T
oFFdetection irrelevant, can greatly improve precision and the linearity/load regulation of output current.Meanwhile, fixedly T of the present invention
oFFdCM control model can effectively reduce the total harmonic distortion THD in the input current of AC input.DCM refers to discontinous mode: when one-period finishes, inductive current has dropped to 0 and kept a period of time
Fig. 2 shows the LED drive circuit in second embodiment of the invention, simultaneously with reference to Fig. 3, this LED drive circuit comprises AC input 1 for input ac voltage, for alternating voltage being converted to the half-wave rectifying circuit 2 of half-wave alternating voltage, for output rectifier and filter 5, the control module 3 of stabilized driving electric current being provided to LED and being connected in parallel on the power inductance L1 at output rectifier and filter 5 two ends and for turn-offing or the switch element 4 of the output of conducting half-wave rectifying circuit 2 and the input of output rectifier and filter 5; AC input 1, half-wave rectifying circuit 2, switch element 4 and output rectifier and filter 5 connect successively; Control module 3 is connected with the control end of switch element 4 and the input of output rectifier and filter 5 respectively, and control module 3 is also coupled with power inductance L1.
Half-wave rectifying circuit 2 can be bridge rectifier.Switch element 4, for CMOS pipe, can certainly be other switch elements.
This control module 3 comprises controller 30, the first sample circuit and the second sample circuit.This second sample circuit comprises auxiliary winding L 2, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the second filter capacitor C2 and the second rectifier diode D2.This first sample circuit comprises sampling resistor Rcs, for gathering the input current information of output rectifier and filter 5 and being converted to voltage signal.
Controller 300 comprise for electrical input Vcc, ground voltage terminal VSS, for detection of the electric current of the power inductance L1 that flows through and when this electric current is zero, produce the zero passage detection unit 301, timer 302, control unit 303, the second control unit 306 of zero current cross signal, for generation of the line wave generator 308 of linear wave, reference voltage generation unit 305, error amplifying unit 304 and voltage comparison unit 307 for generation of reference voltage.
This output rectifier and filter 5 comprises voltage regulation resistance R1, the first filter capacitor C1, rectifier diode D1.
Annexation: voltage regulation resistance R1 and the first filter capacitor C1 are all in parallel with external LED, the first end of the first end of voltage regulation resistance R1, sampling resistor Rcs is all connected with an input of error amplifying unit 304, the second end of sampling resistor Rcs is all connected with the output of switch element 4 with the first end of power inductance L1, the second end ground connection of the auxiliary winding L 2 of power.The positive pole of rectification diode D1 is connected with the second end of voltage regulation resistance R1, and the negative pole of rectification diode D1 is connected with the second end of power inductance L1 and ground connection.Auxiliary winding L 2 and power inductance L1 coupling.
One end of the second resistance R 2, one end of auxiliary winding L 2 is all connected with the positive pole of the second rectifier diode D2, the other end of the second resistance R 2 is connected with one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 is with the other end of auxiliary winding L 2 and be connected with ground voltage terminal VSS, the negative pole of the second rectifier diode D2 is connected with supplying electrical input Vcc, one end of the 4th resistance R 4 is connected with the output of half-wave rectifying circuit 2, the other end of the 4th resistance R 4 is connected with supplying electrical input Vcc, one end of the second filter capacitor C2 is connected with the negative pole of the second rectifier diode D2, the other end of the second filter capacitor C2 is connected with ground voltage terminal VSS.
The first end of this reference voltage generation unit 305 and sampling resistor Rcs is connected with two inputs of error amplifying unit 304 respectively.The output of the output of error amplifying unit 304 and line wave generator 308 is connected with two inputs of voltage comparison unit 307 respectively, and the output of voltage comparison unit 307 is connected with control unit 303, line wave generator 308 and the second control unit 306; Between the output of error amplifying unit 304 and ground voltage terminal VSS, be also connected to one the 3rd capacitor C 3.The input of this zero passage detection unit 301 is connected between the second resistance R 2 and the 3rd resistance R 3, and the output of zero passage detection unit 301 is connected with the second control unit 306, and timer 302 is also connected with the second control unit 306.
Operation principle: sampling resistor Rcs is converted into voltage signal CS by the current information collecting.This voltage signal CS and reference voltage V
rEF1be input to together in error amplifying unit 304.Error amplifying unit 304 calculating voltage signal CS and reference voltage V
rEF1difference and amplify prearranged multiple after export a second voltage Vcomp, this second voltage Vcomp is input in voltage comparison unit 307 together with linear wave.Magnitude of voltage at switch element this linear wave of 4 conduction period raises by certain slope is linear since a base value; The magnitude of voltage V of linear wave
sAWwhile surpassing second voltage Vcomp, a triggering signal of voltage comparison unit 307 outputs is to control unit 303.Control unit 303 produces shutdown signal according to triggering signal and turn-offs with driving switch unit 4, and voltage comparison unit 307 sends to timer 302 to drive timer 302 to start timing this triggering signal, also triggering signal is sent to line wave generator 308 to make the magnitude of voltage of the linear wave of line wave generator 308 be reset to base value, this base value is 0 in the present embodiment.Timer sends timing settling signal to the second control unit 306 after the 302 timing scheduled times.When zero passage detection unit 301 detects electric current in power inductance L1 and is zero, produce a current zero-crossing signal, and this current zero-crossing signal is sent to the second control unit 306.The second control unit 306 produces a Continuity signal and this Continuity signal is sent to control unit 303 after receiving current zero-crossing signal and timing settling signal; Control unit 303 produces and drives signal with 4 conductings of driving switch unit according to this Continuity signal.The second control unit 306, when sending Continuity signal, also sends a first signal to line wave generator 308, and linear wave restarts to rise by certain slope is linear from base value.
In the present invention, the input current information of the sample circuit direct-detection input rectifying filter circuit 5 of control module 3 that is to say the current information of the external LED of flowing through, and is converted into after voltage signal CS and and reference voltage V
rEF1in error amplifying unit 304, carry out error amplification.When system stability, CS ≈ V
rEF1, so the output current of output rectifier and filter 5 can be represented by the formula:
Wherein IR1 and IC1 are respectively flow through R1 and C1 electric current, can ignore.Visible, control module 3 energy direct-detection output currents of the present invention, and form feedback loop, and can accurately control output current, therefore greatly improved precision and the linearity/load regulation of output current.。By changing reference voltage V
rEF1size and R
cSthe size output current that can obtain wanting.
Another advantage of the present invention is effectively to reduce THD, in an ac cycle, the input current of AC input is analyzed below, to describe, how to realize this advantage.As previously mentioned, the mode of operation that the present invention adopts is fixing T
oFFdCM control model, this DCM control model realizes jointly by the zero cross signal of zero passage detection unit 301 output and the timing settling signal of timer 302 outputs.
Because linear wave raises by certain slope is linear, so ON time Ton:
Wherein, the slope that A is linear wave, is constant.For guaranteeing the stability of system, the output of error amplifying unit 304 connects the 3rd capacitor C 3 must be enough large, makes system bandwidth (as 10Hz) much smaller than the frequency (50Hz) of input ac voltage.So in an ac cycle, V
cOMPbe similar to constant.So T
oNin an ac cycle, also can be similar to and regard a constant as.
Because system works is in DCM pattern, the moment that is θ in input AC phase place, the peak current I of power inductance L1
pKcan be obtained by following formula:
V wherein
mit is the peak value of the alternating voltage of input.
So input current I of AC input
iNfor:
T wherein
oFFfor the fixed value of timer 302 settings, and V
mand T
oNin an ac cycle, be approximately constant, so above formula can be changed into:
Wherein
Above formula can be found out, the input current I of AC input
iNinput current be the SIN function of approximate ideal, only comprise fundametal compoment, therefore effectively reduced higher harmonic components, reduced total harmonic distortion (THD).
As shown in Figure 6, when adopting existing LED drive circuit, output current with variation surpass 5mA, and when the neoteric controller of employing, total the variation of output current only has 1mA, significantly improved the linear adjustment capability of driver.
As shown in Figure 7, on the other hand, the THD characteristic of this LED drive circuit is also obviously improved, and in full voltage input range, while adopting existing driver, THD is 12 ~ 18%; And adopt after driver of the present invention, THD drops to and only has 5 ~ 11%.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, within these all belong to protection of the present invention.
Claims (8)
1. a LED drive circuit, comprise AC input (1) for input ac voltage, for described alternating voltage is converted to half-wave alternating voltage half-wave rectifying circuit (2), for to described LED, provide output rectifier and filter (5), the control module (3) of stabilized driving electric current and be connected in parallel on described output rectifier and filter two ends power inductance (L1) and for turn-off or conducting described in the switch element (4) of the output of half-wave rectifying circuit (2) and the input of described output rectifier and filter (5); It is characterized in that, described AC input (1), described half-wave rectifying circuit (2), described switch element (4) and described output rectifier and filter (5) connect successively; Described control module (3) is connected with the control end of described switch element (4) and the input of described output rectifier and filter (5) respectively, and described control module (3) is also coupled with described power inductance (L1);
Described control module (3) is for gathering the first current information of input and the electric current of described power inductance (L1) that flow through of described output rectifier and filter (5), and produce shutdown signal and send to described switch element (4) to close to control described switch element (4) described shutdown signal according to described the first current information, described control module (3) is also for closing at described switch element (4) the beginning timing of having no progeny, described control module (3) produces and drives signal after the timing scheduled time and when the electric current of the described power inductance (L1) of flowing through is zero, send to described switch element (4) to drive described switch element (4) conducting described driving signal.
2. LED drive circuit according to claim 1, it is characterized in that, described control module (3) comprises controller (30), the first sample circuit, described controller (30) comprises the zero passage detection unit (301) for detection of the electric current of the described power inductance (L1) of flowing through, and described zero passage detection unit (301) is by described the first sample circuit and described power inductance (L1) coupling; Generation current zero cross signal when the electric current that described zero passage detection unit (301) detects the described power inductance (L1) of flowing through is zero.
3. LED drive circuit according to claim 2, it is characterized in that, described control module (3) also comprises the second sample circuit, described controller (30) also comprises control unit (303), line wave generator (308) for generation of linear wave, reference voltage generation unit (305) for generation of reference voltage, error amplifying unit (304) and voltage comparison unit (307), two inputs of described error amplifying unit (304) are connected with described reference voltage generation unit (305) and described the second sample circuit respectively, the output of described error amplifying unit (304) and described line wave generator (308) are connected with two inputs of described voltage comparison unit (307) respectively, the output of described voltage comparison unit (307) is connected with described control unit (303),
Described the second sample circuit is converted into voltage signal by the first current information collecting, described voltage signal and described reference voltage are input to described error amplifying unit (304), described error amplifying unit (304) calculates the difference of described voltage signal and described reference voltage and amplifies a second voltage of rear output, described second voltage is input in described voltage comparison unit (307) together with described linear wave, and described linear wave raises since a base value is linear; When the magnitude of voltage of described linear wave surpasses described second voltage, described voltage comparison unit (307) is exported a triggering signal and is reset to described base value to described control unit (303) and described linear wave.
4. LED drive circuit according to claim 3, it is characterized in that, described controller (30) also comprises the second control unit (306) and timer (302), described timer (302) is connected with output and described second control unit (306) of described voltage comparison unit (307) respectively, and described the second control unit (306) is connected with described control unit (303), zero passage detection unit (301) and described line wave generator (308);
Described timer (302) starts timing while receiving described triggering signal, and after the timing scheduled time, send a timing settling signal to described the second control unit (306), after described zero passage detection unit (301) generation current zero cross signal, described current zero-crossing signal is sent to described the second control unit (306), described the second control unit (306) sends Continuity signal to described control unit (303) and sends first signal to described line wave generator (308) after receiving described current zero-crossing signal and described timing settling signal, described control unit (303) produces and drives signal and send to described switch element (4) to make described switch element (4) conducting described driving signal according to described Continuity signal, described linear wave transmitter (308) starts linear rising according to described first signal from described base value.
5. LED drive circuit according to claim 4, it is characterized in that, described switch element (4) is metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor is the output of switch element (4), the drain electrode of described metal-oxide-semiconductor is the output of described switch element (4), and the grid of described metal-oxide-semiconductor is the control end of described switch element (4).
6. LED drive circuit according to claim 5, is characterized in that, described the second sample circuit comprises sampling resistor (Rcs), described output rectifier and filter (5) voltage regulation resistance (R1), the first filter capacitor (C1), rectifier diode (D1);
Described voltage regulation resistance (R1) and described the first filter capacitor (C1) are all in parallel with external LED, the first end of described voltage regulation resistance (R1), the first end of described sampling resistor (Rcs) is all connected with an input of described error amplifying unit (304), the first end of the second end of described sampling resistor (Rcs) and described power inductance (L1) is all connected with the output of described switch element (4), the second end ground connection of described power inductance (L1), the negative pole of described rectification diode (D1) is connected with the second end of described voltage regulation resistance (R1), the positive pole of described rectification diode (D1) is connected with the second end of described power inductance (L1).
7. LED drive circuit according to claim 6, it is characterized in that, described the first sample circuit comprises auxiliary winding (L2), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the second filter capacitor (C2) and the second rectifier diode (D2), described controller (30) comprises for electrical input (Vcc), described auxiliary winding (L2) and described power inductance (L1) coupling;
One end of described the second resistance (R2), one end of described auxiliary winding (L2) is all connected with the positive pole of described the second rectifier diode (D2), the other end of described the second resistance (R2) is connected with one end of described the 3rd resistance (R3), the other end of described the 3rd resistance (R3) is connected with the other end of described auxiliary winding (L2) and is connected with the output of described switch element (4), the positive pole of described the second rectifier diode (D2) is connected for electrical input (Vcc) with described, one end of described the 4th resistance (R4) is connected with the output of described half-wave rectifying circuit (2), the other end of described the 4th resistance (R4) is connected for electrical input (Vcc) with described, one end of described the second filter capacitor (C2) is connected with the negative pole of described the second rectifier diode (D2), the other end of described the second filter capacitor (C2) is connected with the ground voltage terminal (VSS) of described controller (30), the input of described zero passage detection unit (301) is connected between described the second resistance (R2) and described the 3rd resistance (R3).
8. LED drive circuit according to claim 7, it is characterized in that, LED drive circuit also comprises the 3rd electric capacity (C3), and the output of switch element (4) connects described in one end of described the 3rd electric capacity (C3), and the other end is connected with the output of described error amplifying unit (304).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105592597A (en) * | 2016-03-18 | 2016-05-18 | 重庆恒又源科技发展有限公司 | Illumination driving power supply controlling device and system |
| CN107462762A (en) * | 2017-09-06 | 2017-12-12 | 中国电子科技集团公司第四十三研究所 | A kind of integrated drive generator output end current conversion voltage telemeering circuit and its implementation |
| CN108093530A (en) * | 2016-04-29 | 2018-05-29 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and apply its linear LED drive circuit |
| CN108112112A (en) * | 2016-11-24 | 2018-06-01 | 上海航空电器有限公司 | One kind is suitable for powerful constant-current drive circuit |
| CN111837460A (en) * | 2018-03-09 | 2020-10-27 | Lg伊诺特有限公司 | Lighting control device |
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| CN105592597A (en) * | 2016-03-18 | 2016-05-18 | 重庆恒又源科技发展有限公司 | Illumination driving power supply controlling device and system |
| CN105592597B (en) * | 2016-03-18 | 2017-07-11 | 恒亦明（重庆）科技有限公司 | Illumination driving power source control device and system |
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| CN108093530B (en) * | 2016-04-29 | 2020-03-06 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and linear LED drive circuit applying same |
| CN108112112A (en) * | 2016-11-24 | 2018-06-01 | 上海航空电器有限公司 | One kind is suitable for powerful constant-current drive circuit |
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| CN111837460A (en) * | 2018-03-09 | 2020-10-27 | Lg伊诺特有限公司 | Lighting control device |
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