CN203399353U - Novel LED alternating current drive circuit - Google Patents
Novel LED alternating current drive circuit Download PDFInfo
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- CN203399353U CN203399353U CN201320393605.2U CN201320393605U CN203399353U CN 203399353 U CN203399353 U CN 203399353U CN 201320393605 U CN201320393605 U CN 201320393605U CN 203399353 U CN203399353 U CN 203399353U
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Abstract
The utility model discloses a novel LED alternating current drive circuit which includes an electric power, a rectifier circuit, an LED series chipset, a current limiting resistor, a current pulse drive control circuit, and a sampling circuit. The sampling circuit comprises a current sampling resistor R1, a voltage sampling resistor R4 and a voltage sampling resistor R2; one end of the resistor R1 and one end of the resistor R4 are connected with a current sampling input end of the current pulse drive control circuit; the other end of the resistor R1 is grounded; the other end of the resistor R4 and one end of the resistor R2 are connected with a voltage sampling input end of the current pulse drive control circuit; the other end of the resistor R2 is connected to the output end of the rectifier circuit or the other end of the resistor R2 is connected to the positive pole of a voltage regulator tube VZ1; and the negative pole of the voltage regulator tube VZ1 is connected with the output end of the current pulse drive control circuit. The controllable current pulse amplitude alternating current drive mode adopted in the utility model reaches and even exceeds the non isolated AC / DC constant current drive mode in terms of the efficiency and the power factor PF; and the luminous efficiency is high.
Description
Technical field
The utility model relates to LED illumination driving circuit, and the drive current amplitude that is specifically related to a kind of non-isolation is subject to interchange type of drive and the circuit of input voltage control, is generally applicable to various LED lightings.
Background technology
LED light source has the advantages such as environmental protection, energy-conservation, long service life, driving voltage be low, be acknowledged as the most promising lighting source of 21st century, be particularly suitable for the public place that office, classroom, market, parking lot, waiting room, subway, tunnel, street lamp etc. need long-time illumination.
In the LED of existing mains-supplied lighting, the AC/DC Switching Power Supply constant current drive modes that adopt isolation or non-isolation more.In this manner, the electric current by LED maintains steady state value within the scope of certain ripple all the time, makes LED continuous luminous.On the one hand, this type drive circuit is complicated, takies PCB area and space large, and cost is high.Particularly, at light fixtures such as bulb, shot-light and T8 light pipes, take most of space, easily cause dispelling the heat bad; On the other hand, the electrochemical capacitors that use in Switching Power Supply, cause driving power life-span much smaller than the LED chip life-span in light fixture more.Although AC_LED chip only needs 4 resistance can directly use city's electric drive, power-efficient is low, and LED chip utilance is not high yet, and high voltage transient adaptability to changes is poor, and reliability is not high; Although RC step-down AC type of drive circuit structure is simple, the performance index such as drive efficiency, power factor (PF), reliability are on the low side.
Utility model content
The purpose of this utility model is in order to overcome the deficiency of existing LED pulsed drive technology, the LED pulsed drive control mode that provides a kind of drive current amplitude controlled by input voltage, and the LED of the no electrolytic capacitor consisting of this Drive and Control Circuit exchanges driving lighting circuit.
For realizing above object, the technical scheme that the utility model is taked is:
A kind of novel LED AC driving circuit, it comprises civil power, rectification circuit, the LED chipset of connecting, current-limiting resistance, current impulse Drive and Control Circuit, the input of described rectification circuit is connected to civil power, the output of rectification circuit connects the positive pole of LED series connection chipset, the power input of current impulse Drive and Control Circuit is connected in the output of rectification circuit by current-limiting resistance, the output of current impulse Drive and Control Circuit is connected to the negative pole of LED series connection chipset, described novel LED AC driving circuit further comprises a sample circuit, this sample circuit comprises a current sampling resistor R1, one first voltage sample resistance R 4 and a second voltage sampling resistor R2, one end of current sampling resistor R1 one end and the first voltage sample resistance R 4 is all connected to the current sample input of current impulse Drive and Control Circuit, the other end ground connection of current sampling resistor R1, the other end of the first voltage sample resistance R 4 is all connected with the voltage sample input of current impulse Drive and Control Circuit with second voltage sampling resistor R2 one end, the other end of second voltage sampling resistor R2 is connected to the positive pole that the output of rectification circuit or the other end of second voltage sampling resistor R2 are connected to a voltage-stabiliser tube VZ1, the negative pole of this voltage-stabiliser tube VZ1 is connected to the output of current impulse Drive and Control Circuit.
Described current impulse Drive and Control Circuit comprises amplifier, reference voltage source, driving tube and voltage-stabiliser tube VZ, the positive input terminal of described amplifier and negative input end are connected to the output of voltage sample input and reference voltage source, the power end of amplifier is connected to power input, the output of amplifier is connected to the input of driving tube, the output of driving tube and control end are connected to respectively output and the current sample input of current impulse Drive and Control Circuit, the negative pole of voltage-stabiliser tube VZ is connected to power input, its plus earth.
Described driving tube is N channel-type metal-oxide-semiconductor, and the input of described driving tube, output and control end are respectively grid, drain electrode and the source electrode of N channel-type metal-oxide-semiconductor.
Described driving tube is NPN bipolar transistor, and the input of described driving tube, output and control end are respectively base stage, the collector and emitter of NPN bipolar transistor.
This novel LED AC driving circuit further comprises a filter circuit, and this filter circuit is filter capacitor C2, and the positive pole of described filter capacitor C2 is connected to the output of rectification circuit, its minus earth.
Relation between the resistance of the resistance of described the first voltage sample resistance R 4 and current sampling resistor R1 is: R1 < < R4.
Described the first voltage sample resistance R 4 is in parallel with a feedback compensation capacitor C 1.
Described novel LED AC driving circuit further comprises that one is connected in the lightning prevention circuit between civil power and rectification circuit, and described lightning prevention circuit comprises a resistance R 5, and this resistance R 5 is connected on the live wire of civil power.
Described lightning prevention circuit further comprises a leadage circuit, and one end of described leadage circuit is connected between resistance R 5 and the input of rectification circuit, and the other end is connected on the zero line of civil power.
This leadage circuit is any in gas discharge tube, Transient Suppression Diode, piezo-resistance and slide rheostat.
Compared with prior art, tool has the following advantages the utility model:
1. the controlled interchange type of drive of current impulse amplitude that the utility model provides is under parameter matching condition, and efficiency, power factor (PF) PF meet or exceed non-isolated AC/DC constant current drive mode, and light efficiency is high.
2. reliably, the life-span is long.What the utility model can form does not have electrochemical capacitor without electric capacity LED pulse driving circuit, and in theory, this New LED pulse driving circuit life-span is suitable with the LED chip life-span.
3. pair electrical network high voltage transient strong adaptability; There is perfect over-voltage protecting function.
4. whole driving peripheral cell is few, takes up room little, with low cost, can embed in LED light fixture optical mode pcb board, has greatly improved the production efficiency of LED light fixture.
Practice shows type of drive working stability that the utility model provides, reliable.In LED lighting, be with a wide range of applications and promotional value, energy-saving and emission-reduction will be played to positive impetus.
Accompanying drawing explanation
Fig. 1 is the internal structure schematic diagram of current impulse Drive and Control Circuit in the utility model;
Fig. 2 is the former road figure of circuit of a kind of novel LED AC driving circuit embodiment mono-of the utility model;
Fig. 3 is the former road figure of circuit of a kind of novel LED AC driving circuit embodiment bis-of the utility model;
Fig. 4 is the former road figure of circuit of a kind of novel LED AC driving circuit embodiment tri-of the utility model;
Fig. 5 is the former road figure of circuit of a kind of novel LED AC driving circuit embodiment tetra-of the utility model;
Fig. 6 is that the principle of a kind of novel LED AC driving circuit of the utility model is explained with figure.
Wherein: 01, lightning prevention circuit; 02, rectification circuit; 03, sample circuit; 04, current-limiting resistance; 05, LED series connection chipset; 06, current impulse Drive and Control Circuit; 07, filter circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present utility model is described in further details.
Embodiment mono-
Please refer to shown in Fig. 2, a kind of novel LED AC driving circuit, it comprises that civil power AC, rectification circuit 02, LED series connection chipset 05, current-limiting resistance 04(are resistance R 3), current impulse Drive and Control Circuit 06, sample circuit 03.The input of rectification circuit 02 is connected to civil power AC, the output of rectification circuit 02 forms the unidirectional pulsating voltage VCC of driving LED series connection chipset 05, be connected with the positive pole of LED series connection chipset 05, the power input VDD of current impulse Drive and Control Circuit 06 is connected in the output of rectification circuit 02 by current-limiting resistance 04, the output CD of current impulse Drive and Control Circuit 06 is connected to the negative pole of LED series connection chipset 05, this sample circuit 03 comprises a current sampling resistor R1, voltage sample resistance R 4 and voltage sample resistance R 2, the output of rectification circuit 02 passes through voltage sample resistance R 2 successively, ground connection after voltage sample resistance R 4 and current sampling resistor R1, the voltage sample input VCH of current impulse Drive and Control Circuit 06 is connected between voltage sample resistance R 4 and voltage sample resistance R 2, the current sample input CS of current impulse Drive and Control Circuit 06 is connected between voltage sample resistance R 4 and current sampling resistor R1.Rectification circuit 02 can be selected conventional full-wave rectification bridge BR.
The just linear constant current control of the utility model, overvoltage reduce the unit such as pulse current amplitude control and driving tube and organically combine, outside direct voltage is applied to the series arm two ends that consist of driving tube and series LED chipset, forms the current impulse Drive and Control Circuit 06 of LED that drive current amplitude is subject to the stable output power of input voltage control.This current impulse Drive and Control Circuit 06 is comprised of links such as input voltage sampling, amplification, control, drivings, when input voltage surpasses after set point, LED pulse current raises and reduces with input voltage, make LED light fixture consumed power controlled by input voltage, not only improved the adaptability to changes of LED chip to input high voltage transient, also avoided the higher LED chip that causes of input voltage overheated, reduced LED light efficiency, the phenomenon of even damaging.
Particularly, please refer to shown in Fig. 1, current impulse Drive and Control Circuit 06 comprises amplifier A, reference voltage source V
ref, driving tube Q and voltage-stabiliser tube VZ, the positive input terminal of amplifier A and negative input end are connected to voltage sample input VCH and reference voltage source V
refoutput, the power end of amplifier A is connected to power input VDD, the output of amplifier A is connected to the input of driving tube Q, the output of driving tube Q and control end are connected to respectively output CD and the current sample input CS of current impulse Drive and Control Circuit 06, the negative pole of voltage-stabiliser tube VZ is connected to power input VDD, its plus earth.Driving tube Q can adopt metal-oxide-semiconductor, also can adopt bipolar transistor, and in the present embodiment one, driving tube Q adopts N channel-type metal-oxide-semiconductor, and the input of driving tube Q, output and control end are respectively to the grid for N channel-type metal-oxide-semiconductor, drain electrode and source electrode.Certainly, driving tube Q also can adopt NPN bipolar transistor etc., and while adopting NPN bipolar transistor, the input of driving tube Q, output and control end correspond respectively to base stage, the collector and emitter of NPN bipolar transistor.In addition be connected in parallel on the feedback compensation capacitor C 1 at voltage sample resistance R 4 two ends and the feedback compensation network that this voltage sample resistance R 4 has formed amplifier A, avoid occurring the higher-order of oscillation.
The operation principle of the present embodiment one:
220V/110V civil power AC obtains unidirectional pulsating voltage VCC after rectification circuit 02, is directly added to the positive pole of LED series connection chipset 05.
Pulse current amplitude is controlled and stable output power process: when unidirectional pulsating voltage VCC is increased to nV from 0<sub TranNum="95">t</sub>(wherein n is series LED chip number, V<sub TranNum="96">t</sub>for LED cut-in voltage) time, the not conducting of LED series connection chipset 05, I<sub TranNum="97">f</sub>be 0; When unidirectional pulsating voltage VCC is from nV<sub TranNum="98">t</sub>be increased to nV<sub TranNum="99">f</sub>time, 05 conducting of LED series connection chipset, I<sub TranNum="100">f</sub>from 0, be increased to gradually peak current I<sub TranNum="101">peak</sub>, now current sampling resistor R1 terminal voltage is also increased to V since 0<sub TranNum="102">r1max</sub>; Because the current potential of the voltage sample input VCH of current impulse Drive and Control Circuit 06 is subject to the unidirectional pulsating voltage VCC of the full-wave rectification bridge BR output chipset 05 operating current I that connects with LED<sub TranNum="103">f</sub>co-controlling, when resistance R 1<<R4, the voltage V of voltage sample input VCH<sub TranNum="104">cH</sub>meet:<img TranNum="105" file="BDA00003458153500051.GIF" he="129" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="658"/>when the current potential of the voltage sample input VCH of current impulse Drive and Control Circuit 06 approaches reference voltage source V<sub TranNum="106">ref</sub>after, along with unidirectional pulsating voltage VCC raises, the amplifier A output current potential of current impulse Drive and Control Circuit 06 declines, and the grid potential of NMOS pipe declines, and the voltage difference between the drain electrode of NMOS pipe and source electrode is increased, the operating current I of LED series connection chipset 05<sub TranNum="107">f</sub>to decline.As shown in Figure 6, the consumed power of result LED series connection chipset 05 is with the only slightly increase or substantially constant of increase of unidirectional pulsating voltage VCC for its process; Therefore,, in resistance R 2, R4, the proper situation of R1 value, in certain voltage range, the power of LED AC driving circuit does not change with VCC change in voltage substantially.
In order to prevent thunderbolt, cause this novel LED AC driving circuit to be damaged, in the present embodiment, also comprise that one is connected in the lightning prevention circuit 01 between civil power AC and rectification circuit 02, lightning prevention circuit 01 comprises a resistance R 5, and this resistance R 5 is connected on the live wire of civil power AC.Lightning prevention circuit 01 also can be matched a leadage circuit, and one end of leadage circuit is connected between resistance R 5 and the input of rectification circuit 02, and the other end is connected on the zero line of civil power.This leadage circuit is any in gas discharge tube, Transient Suppression Diode, piezo-resistance RZ and slide rheostat.
For 100mW White-light LED chip, can select series LED chip number n according to VF size, for example, when drive current is 30mA, VF is 3.0～3.2V, n span is between 78～80; Peripheral cell parameter is as follows:
Embodiment bis-
Please refer to shown in Fig. 3, embodiment bis-is different from embodiment mono-is that the connected mode of sample circuit 03 is different, in embodiment bis-, current sampling resistor R1, voltage sample resistance R 4 and voltage sample resistance R 2 are connected successively, the current sample input CS of current impulse Drive and Control Circuit 06 is connected between voltage sample resistance R 4 and current sampling resistor R1, the voltage sample input VCH of current impulse Drive and Control Circuit 06 is connected between voltage sample resistance R 4 and voltage sample resistance R 2, the other end of voltage sample resistance R 4 is connected in the output CD of current impulse Drive and Control Circuit 06 by voltage-stabiliser tube VZ1, that is to say the negative pole of LED series connection chipset 05.
The operation principle of the present embodiment two:
220V/110V civil power AC obtains unidirectional pulsating voltage VCC after rectification circuit 02, is directly added to the positive pole of LED series connection chipset 05.
Pulse current amplitude is controlled and stable output power process: when unidirectional pulsating voltage VCC is increased to nV from 0
t(wherein n is series LED chip number, V
tfor LED cut-in voltage) time, the not conducting of LED series connection chipset 05, I
fbe 0; When unidirectional pulsating voltage VCC is from nV
tbe increased to nV
ftime, 05 conducting of LED series connection chipset, I
ffrom 0, be increased to gradually peak current I
peak, now current sampling resistor R1 terminal voltage is also increased to V since 0
r1max; Current sampling resistor R1 size is by LED series connection chipset 05 operating current I
fdetermine, as the output CD of current impulse Drive and Control Circuit 06 above earth potential V
cDbe greater than voltage stabilizing didoe VZ1 burning voltage V
z1time, voltage stabilizing didoe VZ1 conducting, has electric current to flow through voltage sample resistance R 2, now, and the voltage V of voltage sample input VCH
cHmeet:
make LED series connection chipset operating current I
fafter voltage stabilizing didoe VZ1 conducting, with unidirectional pulsating voltage VCC, raise and decline.Similar with embodiment mono-, as shown in Figure 6, the consumed power of result LED series connection chipset 05 is with the only slightly increase or substantially constant of increase of unidirectional pulsating voltage VCC for its process; Therefore,, in resistance R 2, R4, the proper situation of R1 value, in certain voltage range, the power of LED AC driving circuit does not change with VCC change in voltage substantially.
Embodiment tri-
Embodiment tri-improves on the basis of embodiment mono-, for reducing as far as possible the alternating component in unidirectional pulsating voltage VCC, retain its flip-flop, output voltage ripple coefficient is reduced, it is smoother that waveform becomes, please refer to Fig. 4, in embodiment tri-, set up a filter circuit 07, this filter circuit 07 is filter capacitor C2, the positive pole of filter capacitor C2 is connected to the output of rectification circuit 02, its minus earth.
Embodiment tetra-
Embodiment tetra-improves on the basis of embodiment bis-, similar with embodiment tri-, for reducing as far as possible the alternating component in unidirectional pulsating voltage VCC, retain its flip-flop, output voltage ripple coefficient is reduced, it is smoother that waveform becomes, and in embodiment tetra-, please refer to Fig. 5, set up a filter circuit 07, this filter circuit 07 is filter capacitor C2, and the positive pole of filter capacitor C2 is connected to the output of rectification circuit 02, its minus earth.
The above-mentioned description that better case study on implementation of the present utility model is provided, so that those skilled in the art can understand the utility model.Various modifications to these embodiment are evident for personnel skilled in the art, and total application of principle described here can not possessed to creativeness to other embodiment.Thereby the utility model is the embodiment shown in being not limited to here, and should be according to meeting the Principle Method that disclosed and the optimum range of new feature here.
Claims (10)
1. a novel LED AC driving circuit, it comprises civil power, rectification circuit (02), the LED chipset (05) of connecting, current-limiting resistance (04), current impulse Drive and Control Circuit (06), the input of described rectification circuit (02) is connected to civil power, the output of rectification circuit (02) connects the positive pole of LED series connection chipset (05), the power input (VDD) of current impulse Drive and Control Circuit (06) is connected in the output of rectification circuit (02) by current-limiting resistance (04), the output (CD) of current impulse Drive and Control Circuit (06) is connected to the negative pole of LED series connection chipset (05), it is characterized in that, described novel LED AC driving circuit further comprises a sample circuit (03), this sample circuit (03) comprises a current sampling resistor R1, one first voltage sample resistance R 4 and a second voltage sampling resistor R2, one end of current sampling resistor R1 one end and the first voltage sample resistance R 4 is all connected to the current sample input (CS) of current impulse Drive and Control Circuit (06), the other end ground connection of current sampling resistor R1, the other end of the first voltage sample resistance R 4 is all connected with the voltage sample input (VCH) of current impulse Drive and Control Circuit (06) with second voltage sampling resistor R2 one end, the other end of second voltage sampling resistor R2 is connected to the positive pole that the output of rectification circuit (02) or the other end of second voltage sampling resistor R2 are connected to a voltage-stabiliser tube VZ1, the negative pole of this voltage-stabiliser tube VZ1 is connected to the output (CD) of current impulse Drive and Control Circuit (06).
2. novel LED AC driving circuit according to claim 1, is characterized in that, described current impulse Drive and Control Circuit (06) comprises amplifier (A), reference voltage source (V
ref), driving tube (Q) and voltage-stabiliser tube VZ, the positive input terminal of described amplifier (A) and negative input end are connected to voltage sample input (VCH) and reference voltage source (V
ref) output, the power end of amplifier (A) is connected to power input (VDD), the output of amplifier (A) is connected to the input of driving tube (Q), the output of driving tube (Q) and control end are connected to respectively output (CD) and the current sample input (CS) of current impulse Drive and Control Circuit (06), the negative pole of voltage-stabiliser tube VZ is connected to power input (VDD), its plus earth.
3. novel LED AC driving circuit according to claim 2, it is characterized in that, described driving tube (Q) is N channel-type metal-oxide-semiconductor, and input, output and the control end of described driving tube (Q) are respectively grid, drain electrode and the source electrode of N channel-type metal-oxide-semiconductor.
4. novel LED AC driving circuit according to claim 2, it is characterized in that, described driving tube (Q) is NPN bipolar transistor, and input, output and the control end of described driving tube (Q) are respectively base stage, the collector and emitter of NPN bipolar transistor.
5. according to the novel LED AC driving circuit described in claim 1-4 any one, it is characterized in that, this novel LED AC driving circuit further comprises a filter circuit (07), this filter circuit (07) is filter capacitor C2, the positive pole of described filter capacitor C2 is connected to the output of rectification circuit (02), its minus earth.
6. according to the novel LED AC driving circuit described in claim 1-4 any one, it is characterized in that, the relation between the resistance of described the first voltage sample resistance R 4 and the resistance of current sampling resistor R1 is: R1 < < R4.
7. according to the novel LED AC driving circuit described in claim 1-4 any one, it is characterized in that, described the first voltage sample resistance R 4 is in parallel with a feedback compensation capacitor C 1.
8. according to the novel LED AC driving circuit described in claim 1-4 any one, it is characterized in that, described novel LED AC driving circuit further comprises that one is connected in the lightning prevention circuit (01) between civil power and rectification circuit (02), described lightning prevention circuit (01) comprises a resistance R 5, and this resistance R 5 is connected on the live wire of civil power.
9. novel LED AC driving circuit according to claim 8, it is characterized in that, described lightning prevention circuit (01) further comprises a leadage circuit, and one end of described leadage circuit is connected between resistance R 5 and the input of rectification circuit (02), and the other end is connected on the zero line of civil power.
10. novel LED AC driving circuit according to claim 9, is characterized in that, this leadage circuit is any in gas discharge tube, Transient Suppression Diode, piezo-resistance and slide rheostat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320393605.2U CN203399353U (en) | 2013-07-03 | 2013-07-03 | Novel LED alternating current drive circuit |
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|---|---|---|---|
| CN201320393605.2U CN203399353U (en) | 2013-07-03 | 2013-07-03 | Novel LED alternating current drive circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104981049A (en) * | 2014-04-14 | 2015-10-14 | 欧司朗有限公司 | Light modulation driving circuit and illumination apparatus comprising the light modulation driving circuit |
| CN105423140A (en) * | 2014-09-15 | 2016-03-23 | 戴乐格半导体公司 | Dynamic Bleeder Current Control for LED Dimmers |
| CN106793277A (en) * | 2016-12-12 | 2017-05-31 | 昂宝电子（上海）有限公司 | For the line voltage compensation system of LED constant current control |
| CN106937439A (en) * | 2015-11-12 | 2017-07-07 | 台湾快捷国际股份有限公司 | The control circuit and its active leadage circuit of light emitting diode |
| CN106954294A (en) * | 2016-07-27 | 2017-07-14 | 上海占空比电子科技有限公司 | The permanent linear LED drive circuit of input power |
| CN106954297A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of the thyristor regulating of novel efficient |
| WO2017219648A1 (en) * | 2016-06-22 | 2017-12-28 | 华润矽威科技（上海）有限公司 | Single-segment, linear and constant-power led driving circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981049A (en) * | 2014-04-14 | 2015-10-14 | 欧司朗有限公司 | Light modulation driving circuit and illumination apparatus comprising the light modulation driving circuit |
| CN104981049B (en) * | 2014-04-14 | 2018-12-28 | 欧司朗有限公司 | Dimming driving circuit and lighting device including the dimming driving circuit |
| CN105423140A (en) * | 2014-09-15 | 2016-03-23 | 戴乐格半导体公司 | Dynamic Bleeder Current Control for LED Dimmers |
| CN106937439A (en) * | 2015-11-12 | 2017-07-07 | 台湾快捷国际股份有限公司 | The control circuit and its active leadage circuit of light emitting diode |
| WO2017219648A1 (en) * | 2016-06-22 | 2017-12-28 | 华润矽威科技（上海）有限公司 | Single-segment, linear and constant-power led driving circuit and method |
| US10375778B2 (en) | 2016-06-22 | 2019-08-06 | China Resources Powtech (Shanghai) Co., Ltd. | Single-segment linear constant-power LED driving circuit and method |
| CN106954294A (en) * | 2016-07-27 | 2017-07-14 | 上海占空比电子科技有限公司 | The permanent linear LED drive circuit of input power |
| CN106954297A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of the thyristor regulating of novel efficient |
| CN106793277A (en) * | 2016-12-12 | 2017-05-31 | 昂宝电子（上海）有限公司 | For the line voltage compensation system of LED constant current control |
| CN111654946A (en) * | 2016-12-12 | 2020-09-11 | 昂宝电子（上海）有限公司 | Line voltage compensation system for LED constant current control |
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Granted publication date: 20140115 Termination date: 20140703 |
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