CN102523664A - Light modulator for narrow voltage light-emitting diode (LED) lamp - Google Patents
Light modulator for narrow voltage light-emitting diode (LED) lamp Download PDFInfo
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- CN102523664A CN102523664A CN2012100051451A CN201210005145A CN102523664A CN 102523664 A CN102523664 A CN 102523664A CN 2012100051451 A CN2012100051451 A CN 2012100051451A CN 201210005145 A CN201210005145 A CN 201210005145A CN 102523664 A CN102523664 A CN 102523664A
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Abstract
The invention discloses a light modulator for a narrow voltage light-emitting diode (LED) lamp. The narrow voltage LED lamp comprises an LED lamp rectifying circuit (10), an LED light source load (20) and a constant current source circuit (30) which is used for stabilizing the voltage and the current of the LED light source load (20) and comprises a depletion field effect transistor. The light modulator for the narrow voltage LED lamp comprises a light modulation rectifying circuit (1), a voltage division circuit (2) and a metal oxide semiconductor (MOS) tube voltage regulation circuit (3), wherein the voltage division circuit (2) comprises a fixed resistor (R1) and a potentiometer (RW1); the MOS tube voltage regulation circuit (3) comprises a voltage regulation MOS tube (Q1); the fixed resistor body of the potentiometer (RW1) is connected in series with the fixed resistor (R1) and then is connected with the output end of the light modulation rectifying circuit (1); the drain electrode of the voltage regulation MOS tube (Q1) is connected with the positive electrode output end of the light modulation rectifying circuit (1); the gate electrode of the voltage regulation MOS tube (Q1) is connected with the variable resistance output end of the potentiometer (RW1); the source electrode of the voltage regulation MOS tube (Q1) is the output positive electrode end of the light modulator; and the negative electrode output end of the light modulation rectifying circuit (1) is the output genitive electrode end of the light modulator.
Description
Technical field
The present invention relates to a kind of dimmer, relate in particular to a kind of dimmer of narrow voltage LED lamp.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Traditional incandescent lamp and fluorescent lamp can dispose dimmer and carry out light modulation, and the output illumination of adjustment light is to satisfy needs of people.Also there is the demand of light modulation in the LED lamp, but because the particularity of LED lamp, traditional dimmer often can not adapt to the LED lamp.As depicted in figs. 1 and 2, be the circuit diagram of two kinds narrow voltage LED lamps developing of the applicant.Like its specified input voltage is 220V AC, and when input voltage during less than 180V AC, the power of light fixture is almost nil, so the output voltage of dimmer is the adjustable requirement that can satisfy its light modulation of 180～220V AC; In like manner, be 120V AC like its specified input voltage, when input voltage during less than 90V AC, the power of light fixture is almost nil, so the output voltage of dimmer is the adjustable requirement that can satisfy its light modulation of 90～120V AC.Because the LED lamp of circuit illustrated in figures 1 and 2 is directed against the standard line voltage in country variant or area to different LED numbers should be arranged, therefore system becomes narrow voltage LED lamp.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes prior art, provide a kind of simple in structure, components and parts are few, the dimmer of the narrow voltage LED lamp of good dimming effect.
The technical scheme that the present invention adopted is: said narrow voltage LED lamp comprises LED lamp rectification circuit, led light source load, constant-current source circuit; Electric current is by the input of the input of power supply and after the rectification of said LED lamp rectification circuit, flow through successively said led light source load, said constant-current source circuit and constitute the loop; Said constant-current source circuit carries out voltage stabilizing, current stabilization to said led light source load; Said led light source load comprises at least one group of several LED that are in series; Said constant-current source circuit comprises at least one group of constant-current source device; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact; The dimmer of said narrow voltage LED lamp comprises light modulation rectification circuit, bleeder circuit, metal-oxide-semiconductor regulating circuit; Said bleeder circuit comprises fixed resistance, potentiometer, and said metal-oxide-semiconductor regulating circuit comprises the pressure regulation metal-oxide-semiconductor, and the fixed resistance body of said potentiometer is in series with said fixed resistance and then is connected with the output of said light modulation rectification circuit; The drain electrode of said pressure regulation metal-oxide-semiconductor is connected with the cathode output end of said light modulation rectification circuit; The grid of said pressure regulation metal-oxide-semiconductor is connected with the variable resistor output of said potentiometer, and the source electrode of said pressure regulation metal-oxide-semiconductor is the output cathode end of dimmer, and the cathode output end of said light modulation rectification circuit is the output negative pole end of dimmer.
Said narrow voltage LED lamp also comprises LED lamp short-circuit protection circuit, and said LED lamp short-circuit protection circuit is connected between the input and said LED lamp rectification circuit of power supply.
Said narrow voltage LED lamp also comprises LED lamp filter circuit; Said LED lamp filter circuit is connected to after the said LED lamp rectification circuit; Electric current after the rectification of said LED lamp rectification circuit again through the filtering of said LED lamp filter circuit, flow through successively more said led light source load, said constant-current source circuit and constitute the loop.
The dimmer of said narrow voltage LED lamp also comprises power switch circuit, and said power switch circuit is connected to the power input before the said light modulation rectification circuit.
The dimmer of said narrow voltage LED lamp also comprises the light modulation short-circuit protection circuit, and said light modulation short-circuit protection circuit is connected to the power input before the said light modulation rectification circuit.
The dimmer of said narrow voltage LED lamp also comprises the inductor filter circuit, and said inductor filter circuit is connected to the power input before the said light modulation rectification circuit.
The dimmer of said narrow voltage LED lamp also comprises capacitor filter, and said capacitor filter is connected between the output negative pole end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor.
The dimmer of said narrow voltage LED lamp also comprises protective circuit of voltage regulation, and said protective circuit of voltage regulation is connected between the output cathode end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor.
The invention has the beneficial effects as follows: because said narrow voltage LED lamp comprises LED lamp rectification circuit, led light source load, constant-current source circuit; Electric current is by the input of the input of power supply and after the rectification of said LED lamp rectification circuit, flow through successively said led light source load, said constant-current source circuit and constitute the loop; Said constant-current source circuit carries out voltage stabilizing, current stabilization to said led light source load; Said led light source load comprises at least one group of several LED that are in series; Said constant-current source circuit comprises at least one group of constant-current source device; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact; The dimmer of said narrow voltage LED lamp comprises light modulation rectification circuit, bleeder circuit, metal-oxide-semiconductor regulating circuit; Said bleeder circuit comprises fixed resistance, potentiometer, and said metal-oxide-semiconductor regulating circuit comprises the pressure regulation metal-oxide-semiconductor, and the fixed resistance body of said potentiometer is in series with said fixed resistance and then is connected with the output of said light modulation rectification circuit; The drain electrode of said pressure regulation metal-oxide-semiconductor is connected with the cathode output end of said light modulation rectification circuit; The grid of said pressure regulation metal-oxide-semiconductor is connected with the variable resistor output of said potentiometer, and the source electrode of said pressure regulation metal-oxide-semiconductor is the output cathode end of dimmer, and the cathode output end of said light modulation rectification circuit is the output negative pole end of dimmer; The civil power alternating current becomes Rectified alternating current after the rectification of said light modulation rectification circuit; After said fixed resistance and said potentiometer dividing potential drop, can obtain the pulsating dc voltage of certain limit at the grid of said pressure regulation metal-oxide-semiconductor, promptly when said potentiometer is turned up full blast; The grid of said pressure regulation metal-oxide-semiconductor obtains the pulsating dc voltage of peak; When said potentiometer was transferred to minimum point, the grid of said pressure regulation metal-oxide-semiconductor obtained the pulsating dc voltage of minimum, and is voltage-controlled down at grid; The source electrode of said pressure regulation metal-oxide-semiconductor is that the output cathode end of dimmer can obtain above-mentioned adjustable Rectified alternating current output, so that the input power supply of said narrow voltage LED lamp to be provided; When said potentiometer was turned up full blast, the input voltage of said narrow voltage LED lamp was the specified line voltage of dc pulse, at this moment; Said narrow voltage LED lamp is the full power operation, and the working range of said depletion mode fet is between the c point～d point among Fig. 5, in this interval; When voltage changes; The voltage that changes can be absorbed by said depletion mode fet, and the electric current maintenance is constant, reaches the effect of constant current full power stable operation; Turn down gradually in the process at said potentiometer, the input voltage of said narrow voltage LED lamp reduces gradually, when voltage is lower than the saturated cut-in voltage that c orders; Electric current and voltage descend gradually, and the power of said narrow voltage LED lamp also descends thereupon, and therefore luminous illumination reduces; Reach the effect of light modulation; When the working point of said constant-current source device was positioned at the b point, the power of said narrow voltage LED lamp was about the half the of rated power, was the half-power operation this moment; LED has the voltage-current characteristic of diode, the total voltage V of the said led light source load of being made up of several LED that are in series
AThan total threshold voltage V
fDuring the low certain fixed value Δ of value, said led light source load neither conducting is not luminous yet, when said potentiometer is transferred to minimum point, if the input voltage of said narrow voltage LED lamp is than total threshold voltage V
fBe worth low and difference during greater than Δ; LED just can't open; The working point of said constant-current source device also is pulled down near a point, and the electric current and the power of said narrow voltage LED lamp are almost nil, and promptly said narrow voltage LED lamp is in resting state; Realized the light modulation of LED lamp through said process, so the present invention is simple in structure, components and parts are few, good dimming effect.
Description of drawings
Fig. 1 is the circuit diagram of the narrow voltage LED lamp of the embodiment of the invention one;
Fig. 2 is the circuit diagram of the narrow voltage LED lamp of the embodiment of the invention two;
Fig. 3 is the circuit diagram of dimmer of the narrow voltage LED lamp of the embodiment of the invention one;
Fig. 4 is the circuit diagram of dimmer of the narrow voltage LED lamp of the embodiment of the invention two;
Fig. 5 is the VA characteristic curve sketch map of the constant-current source device of the embodiment of the invention.
Embodiment
Embodiment one:
Like Fig. 1, Fig. 3, shown in Figure 5, the pulsating direct current formula LED lamp that the narrow voltage LED lamp of present embodiment is a kind of no electrolytic capacitor comprises LED lamp rectification circuit 10, led light source load 20, constant-current source circuit 30, LED lamp short-circuit protection circuit 50; Electric current is by the input of the input of power supply and after 10 rectifications of said LED lamp rectification circuit, flow through successively said led light source load 20, said constant-current source circuit 30 and constitute the loop; It is rectifier bridge D0 that said LED lamp rectification circuit 10 adopts bridge rectifier, can certainly adopt other rectifier system rectifications, and said LED lamp short-circuit protection circuit 50 is connected between the input and said LED lamp rectification circuit 10 of power supply; Said LED lamp short-circuit protection circuit 50 comprises protective tube F0; When the circuit overcurrent, said protective tube F0 fusing plays a protective role; Can certainly adopt other forms of protective circuit; Said led light source load 20 comprises one group of LED that is in series, i.e. LED1a～LED (n) a, and number n=line voltage of the LED that is in series/(2.4V～2.9V); Voltage stabilizing, current stabilization are carried out in 30 pairs of said led light source loads 20 of said constant-current source circuit; Said constant-current source circuit 30 comprises one group of constant-current source device, and said constant-current source device comprises a depletion mode fet Q1a, and the drain electrode of said depletion mode fet Q1a is a contact; The source electrode of said depletion mode fet Q1a and grid short circuit mutually constitute another contact; As shown in Figure 5, when the voltage of depletion mode fet between grid and source electrode was zero, the drain-source electrode current had been the constant current conducting; Since depletion mode fet when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region basically; So it can be used as a constant-current source and uses, in the present embodiment, the saturated cut-in voltage of said depletion mode fet Q1a is certain particular value of 2～4V scope; The dimmer of said narrow voltage LED lamp comprises light modulation rectification circuit 1, bleeder circuit 2, metal-oxide-semiconductor regulating circuit 3, power switch circuit 4, light modulation short-circuit protection circuit 5; It is rectifier bridge D1 that said light modulation rectification circuit 1 adopts bridge rectifier, can certainly adopt other rectifier system rectifications, and said bleeder circuit 2 comprises fixed resistance R1, potentiometer RW1; Said metal-oxide-semiconductor regulating circuit 3 comprises pressure regulation metal-oxide-semiconductor Q1; The fixed resistance body of said potentiometer RW1 is in series with said fixed resistance R1 and then is connected with the output of said light modulation rectification circuit 1, and the drain electrode of said pressure regulation metal-oxide-semiconductor Q1 is connected with the cathode output end of said light modulation rectification circuit 1, and the grid of said pressure regulation metal-oxide-semiconductor Q1 is connected with the variable resistor output of said potentiometer RW1; The source electrode of said pressure regulation metal-oxide-semiconductor Q1 is the output cathode end of dimmer; The cathode output end of said light modulation rectification circuit 1 is the output negative pole end of dimmer, and said power switch circuit 4 comprises switch element S1, is connected to said light modulation rectification circuit 1 power firestreak input before; The switch that is used for whole dimmer; Said light modulation short-circuit protection circuit 5 comprises protective tube F1, is connected to said light modulation rectification circuit 1 zero-power line input before, is used for short-circuit protection; The input voltage of the dimmer of said narrow voltage LED lamp is the 220V civil power; Output voltage is (220V-Δ)～220V Rectified alternating current, and the Δ value can be adjusted by the design of said potentiometer RW1, when said potentiometer RW1 is transferred to minimum point, is 0 but the Δ value must make the output current of LED lamp; When civil power is 220VAC, Δ ≈ 40VAC.
The light modulation process of present embodiment is following: 220V civil power alternating current becomes the Rectified alternating current that effective value is 220V after said light modulation rectification circuit 1 rectification; After said fixed resistance R1 and said potentiometer RW1 dividing potential drop; Source electrode at said pressure regulation metal-oxide-semiconductor Q1 can obtain the pulsating dc voltage that effective value is 180～220V; Promptly when said potentiometer RW1 turned up full blast, the source electrode of said pressure regulation metal-oxide-semiconductor Q1 obtained the pulsating dc voltage that effective value is 220V, when said potentiometer RW1 is transferred to minimum point; The source electrode of said pressure regulation metal-oxide-semiconductor Q1 obtains the pulsating dc voltage that effective value is 180V; Promptly voltage-controlled down at grid, the source electrode of said pressure regulation metal-oxide-semiconductor Q1 is the Rectified alternating current output that the output cathode end of dimmer can obtain about 180～220V, so that the input power supply of said narrow voltage LED lamp to be provided; When said potentiometer RW1 turned up full blast, the input voltage of said narrow voltage LED lamp was 220V, promptly specified line voltage; At this moment, said narrow voltage LED lamp is the full power operation, and the working range of said depletion mode fet Q1a is between the c point～d point among Fig. 5; In this interval, when voltage changed, the voltage of variation can be absorbed by said depletion mode fet Q1a; And the electric current maintenance is constant, reaches the effect of constant current full power stable operation; Turn down in the process gradually at said potentiometer RW1; The input voltage of said narrow voltage LED lamp reduces gradually, and when the voltage of said constant-current source device (depletion mode fet Q1a) was lower than the saturated cut-in voltage that c orders, electric current and voltage descended gradually; The power of said narrow voltage LED lamp also descends thereupon; Therefore luminous illumination reduces, and reaches the effect of light modulation, when the working point of said constant-current source device is positioned at the b point; The power of said narrow voltage LED lamp is about the half the of rated power, is the half-power operation this moment; When said potentiometer RW1 was transferred to minimum point, the input voltage of said narrow voltage LED lamp was about 180V, than the low 40V of rated voltage; LED has the voltage-current characteristic of diode, and the Vf value of general pulsating direct current LED is that its dead band of LED (threshold) voltage of 2.4～2.6V is about 2.0～2.2V, and total Vf value of the said led light source load of being made up of 84 LED that are in series 20 is about 210V; Threshold voltage is about 176V; Be that threshold voltage hangs down 34V approximately than the Vf value in the present embodiment, and at this moment lucky input voltage is than the low 40V of rated voltage, below the threshold voltage of LED; LED can't open; The working point of said constant-current source device also is pulled down near a point, and the electric current and the power of said narrow voltage LED lamp are almost nil, and promptly said narrow voltage LED lamp is in resting state.
In the present embodiment; The dimmer of said narrow voltage LED lamp and said narrow voltage LED lamp does not all comprise filter capacitor; Make the reactive power of circuit significantly reduce, therefore the power factor (PF) of warp test circuit of the present invention is a kind of LED lamp and dimmer of High Power Factor greater than 0.85.
Embodiment two:
Like Fig. 2, Fig. 4, shown in Figure 5; The difference of present embodiment and embodiment one is: in the present embodiment; Said narrow voltage LED lamp is a kind of LED lamp that the intimate direct current supply of electrochemical capacitor is arranged, and also comprises LED lamp filter circuit 40, and said LED lamp filter circuit 40 comprises filter capacitor C0, the bleeder resistance R0 of mutual parallel connection; Said LED lamp filter circuit 40 is connected to after the said LED lamp rectification circuit 10; Electric current after 10 rectifications of said LED lamp rectification circuit again through 40 filtering of said LED lamp filter circuit, flow through successively more said led light source load 20, said constant-current source circuit 30 and constitute the loop, its filtering voltage regulation better effects if; The dimmer of said narrow voltage LED lamp also comprises inductor filter circuit 6, capacitor filter 7, protective circuit of voltage regulation 8; Said inductor filter circuit 6 comprises that filter inductance L1 is connected to said light modulation rectification circuit 1 zero-power line input before; Said capacitor filter 7 comprises that filter capacitor C1 is connected between the output negative pole end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor Q1; So that output current is more stable; Said protective circuit of voltage regulation 8 comprises that voltage stabilizing didoe D2 is connected between the output cathode end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor Q1, so that said pressure regulation metal-oxide-semiconductor Q1 is carried out voltage-stabilizing protection; When line voltage was 220～240V AC, the number of every group of several LED that are in series of said led light source load 20 was 92～113; When line voltage was 100～120VAC, the number of every group of several LED that are in series of said led light source load 20 was 40～56.
All the other characteristics of present embodiment are with embodiment one.
Above embodiment only illustrates; Be not to be limitation of the present invention; Said led light source load 20 also can be several LED that many groups are in series; And one group of said constant-current source device of every group of said led light source load 20 serial connections, one group of said constant-current source device of said led light source load 20 serial connections of perhaps many groups, power and the illumination of organizing LED all increase more.
The present invention can be widely used in LED light adjusting circuit field.
Claims (8)
1. the dimmer of one kind narrow voltage LED lamp; Said narrow voltage LED lamp comprises LED lamp rectification circuit (10), led light source load (20), constant-current source circuit (30); Electric current is by the input of the input of power supply and after said LED lamp rectification circuit (10) rectification, flow through successively said led light source load (20), said constant-current source circuit (30) and constitute the loop; Said constant-current source circuit (30) carries out voltage stabilizing, current stabilization to said led light source load (20); Said led light source load (20) comprises at least one group of several LED that are in series; Said constant-current source circuit (30) comprises at least one group of constant-current source device; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact; It is characterized in that: the dimmer of said narrow voltage LED lamp comprises light modulation rectification circuit (1), bleeder circuit (2), metal-oxide-semiconductor regulating circuit (3); Said bleeder circuit (2) comprises fixed resistance (R1), potentiometer (RW1), and said metal-oxide-semiconductor regulating circuit (3) comprises pressure regulation metal-oxide-semiconductor (Q1), and the fixed resistance body of said potentiometer (RW1) is in series with said fixed resistance (R1) and then is connected with the output of said light modulation rectification circuit (1); The drain electrode of said pressure regulation metal-oxide-semiconductor (Q1) is connected with the cathode output end of said light modulation rectification circuit (1); The grid of said pressure regulation metal-oxide-semiconductor (Q1) is connected with the variable resistor output of said potentiometer (RW1), and the source electrode of said pressure regulation metal-oxide-semiconductor (Q1) is the output cathode end of dimmer, and the cathode output end of said light modulation rectification circuit (1) is the output negative pole end of dimmer.
2. the dimmer of narrow voltage LED lamp according to claim 1; It is characterized in that: said narrow voltage LED lamp also comprises LED lamp short-circuit protection circuit (50), and said LED lamp short-circuit protection circuit (50) is connected between the input and said LED lamp rectification circuit (10) of power supply.
3. the dimmer of narrow voltage LED lamp according to claim 1; It is characterized in that: said narrow voltage LED lamp also comprises LED lamp filter circuit (40); Said LED lamp filter circuit (40) is connected to said LED lamp rectification circuit (10) afterwards; Again through said LED lamp filter circuit (40) filtering, the said led light source load (20) of flowing through successively again, said constant-current source circuit (30) also constitute the loop to electric current after said LED lamp rectification circuit (10) rectification.
4. according to the dimmer of any described narrow voltage LED lamp of claim 1 to 3; It is characterized in that: the dimmer of said narrow voltage LED lamp also comprises power switch circuit (4), and said power switch circuit (4) is connected to said light modulation rectification circuit (1) power input before.
5. according to the dimmer of any described narrow voltage LED lamp of claim 1 to 3; It is characterized in that: the dimmer of said narrow voltage LED lamp also comprises light modulation short-circuit protection circuit (5), and said light modulation short-circuit protection circuit (5) is connected to said light modulation rectification circuit (1) power input before.
6. according to the dimmer of any described narrow voltage LED lamp of claim 1 to 3; It is characterized in that: the dimmer of said narrow voltage LED lamp also comprises inductor filter circuit (6), and said inductor filter circuit (6) is connected to said light modulation rectification circuit (1) power input before.
7. according to the dimmer of any described narrow voltage LED lamp of claim 1 to 3; It is characterized in that: the dimmer of said narrow voltage LED lamp also comprises capacitor filter (7), and said capacitor filter (7) is connected between the output negative pole end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor (Q1).
8. according to the dimmer of any described narrow voltage LED lamp of claim 1 to 3; It is characterized in that: the dimmer of said narrow voltage LED lamp also comprises protective circuit of voltage regulation (8), and said protective circuit of voltage regulation (8) is connected between the output cathode end of grid and said dimmer of said pressure regulation metal-oxide-semiconductor (Q1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100051451A CN102523664A (en) | 2012-01-09 | 2012-01-09 | Light modulator for narrow voltage light-emitting diode (LED) lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100051451A CN102523664A (en) | 2012-01-09 | 2012-01-09 | Light modulator for narrow voltage light-emitting diode (LED) lamp |
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| CN102523664A true CN102523664A (en) | 2012-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103002620A (en) * | 2012-08-22 | 2013-03-27 | 苏州金科信汇光电科技有限公司 | LED daylight lamp with high-frequency self-vibration electronic transformer |
| CN105898945A (en) * | 2014-12-04 | 2016-08-24 | 南充市永程电子科技有限公司 | LED driving dimming transformer |
| CN107872913A (en) * | 2017-12-13 | 2018-04-03 | 刘向宁 | Light-emitting diode voltage regulation drive circuit |
| CN109144153A (en) * | 2017-06-15 | 2019-01-04 | 全球绿能资源股份有限公司 | Closed-loop charging voltage stabilizing device and system |
| CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
| CN110234188A (en) * | 2019-05-08 | 2019-09-13 | 深圳市富满电子集团股份有限公司 | The self shifter of LED drive chip adjusts circuit |
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| CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
| CN110234188A (en) * | 2019-05-08 | 2019-09-13 | 深圳市富满电子集团股份有限公司 | The self shifter of LED drive chip adjusts circuit |
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Application publication date: 20120627 |