CN104918387A - Alternating current driven LED illumination apparatus - Google Patents
Alternating current driven LED illumination apparatus Download PDFInfo
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- CN104918387A CN104918387A CN201510353228.3A CN201510353228A CN104918387A CN 104918387 A CN104918387 A CN 104918387A CN 201510353228 A CN201510353228 A CN 201510353228A CN 104918387 A CN104918387 A CN 104918387A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention relates to an alternating current driven LED illumination apparatus. The LED illumination apparatus comprises a rectification unit, a sampling unit, a switching unit and at least one LED module. The first output end of the rectification unit is connected with the sampling unit and the first LED module, the first input end of the switching unit is connected with the output end of the corresponding LED module, and the second input end of the switching unit is connected with the voltage splitting end of the sampling unit. the output end of the switching unit and the second output end of the rectification unit are grounded. The switching unit comprises third to fifth resistors, a first Zener diode, a second Zener diode, a first filed-effect transistor and a second field effect transistor. The LED illumination apparatus is applicable to be directly driven by the alternating current, and has the advantages of simple circuit, small size, light weight and low cost. In addition, through presetting proper switch-off voltage and switch-on voltage, the situation that the LED illumination apparatus flashes along with the fluctuation of alternating-current voltage is avoided.
Description
The divisional application that the present invention is original applying number is 201110457843.0, original application day is on December 31st, 2011, former denomination of invention is the LED light emission device of alternating current Direct driver.
Technical field
The present invention relates to LED (light-emitting diode) lighting field, particularly relate to a kind of LED light device exchanging driving.
Background technology
LED, as a kind of New Solid light source, is expected to become lighting source of new generation with advantages such as its energy-saving and environmental protection, life-span length.As everyone knows, existing LED is nearly all by DC powered, and our productive life electricity consumption is alternating current.Therefore, in the LED product used at present, need a power supply changeover device, alternating current is converted to direct current.The introducing of power supply changeover device, brings a lot of negative effect.One, the life-span of power supply changeover device, well below the life-span of LED self, makes shorten the useful life of lighting device; Its two, power supply changeover device can reduce the efficiency of light-emitting device; Its three, in low-power applications, power supply changeover device can cause the decline of power factor and the increase of current total harmonic distortion.In order to give full play to the advantage of semiconductor lighting, current study hotspot can be become by the LED light emission device of alternating current Direct driver.
In existing AC LED public technology, be use plurality of LEDs assembly to be formed by connecting according to the circuit topological structure of reverse parallel connection or bridge rectifier, to meet the driving requirement of alternating electromotive force mostly.But alternating current fluctuates according to certain frequency period, due to the existence of LED self cut-in voltage, when instantaneous voltage exceedes cut-in voltage, LED just can conducting also luminescence.Otherwise LED is that cut-off is non-luminous.This circuit makes the luminous efficiency of LED very low, and occurs light-emitting flash phenomenon along with AC voltage fluctuations.
In international monopoly WO 2004/023568A1 " LIGHT-EMITTING DEVICE HAVINGLIGHT-EMITTING ELEMENTS ", propose integrated LED chip array on a sapphire substrate, thus provide a kind of alternating current power-actuated light-emitting device, but do not solve the light-emitting flash problem of LED.
US Patent No. 7,489,086B2 " AC LIGHT EITTING DIODE AND AC LEDDRIVE METHODS AND APPARATUS " provides a kind of AC LED device, this invention is a kind of by the device of multiple LED integration packaging, utilizes the LED light-emitting flash phenomenon that the visual persistence effect of human eye causes to make up alternating current.This patent fundamentally solves AC voltage cycle and to fluctuate the light-emitting flash phenomenon caused.
Visible, disclosing in LED alternating-current Driving technique, the drive current that all there is shortcoming a: LED can fluctuate along with the fluctuation of alternating voltage, occurs that brightness changes, produce the phenomenon of light-emitting flash when causing LED luminous.Meanwhile, the core of LED component is a PN junction diode, and its I-V characteristic is approximate exponential function, and after the voltage at LED two ends is greater than cut-in voltage, the electric current flowing through PN junction exponentially increases.The AC driving method of prior art, when alternating voltage surprisingly raises, directly may damage LED component.
Chinese patent CN 102202441A discloses the constant-current controller topological circuit that a kind of LED illumination lamp AC power is directly powered, and it comprises EMI circuit, rectification circuit, circuit of power factor correction and constant-current drive circuit.Its working method is: circuit of power factor correction changes the conducting state of power factor control circuit 31 and 32 according to the large minizone of input ac voltage, and the quantity of lighting of LED illumination lamp is changed, thus improves power factor.When real work, if the switch of power factor control circuit 31,32 equivalence reaches 1/3,2/3 crest voltage time will switch immediately, improve power factor with this.See Fig. 1, in power factor control circuit 31,32, the conducting state of K1, K2 is only by the impact of the voltage on the circuit of corresponding biasing resistor R6, R7 or R8, R9 composition.Further, owing to have employed conventional switching over topological circuit, if the switch of power factor control circuit 31,32 equivalence reaches 1/3,2/3 crest voltage time will switch immediately, thus cause there will be flashing state when switching.
Each switch element in the present invention is through the LED light source module reception cut-in voltage of correspondence and the dividing potential drop termination through sampling unit receives shutoff voltage, and the on off operating mode of switch element is subject to the joint effect of cut-in voltage and shutoff voltage.Further, the present invention does not adopt the conventional switching over topological circuit disclosed in D1, but adopts switch element to receive cut-in voltage and shutoff voltage from the negative terminal of the LED light source module of correspondence and sampling unit dividing potential drop termination.Switch element receives the cut-in voltage and conducting that reach threshold value, and maintains conducting state until the threshold value that the shutoff voltage of reception reaches setting makes it turn off.Each switch element can maintain specific ON time as required, thus avoids the scintillation that multi-stage LED module there will be when directly switching according to the size of input voltage.
The connected mode of the constant-current circuit input in the connected mode of switch element of the present invention two inputs and documents exists obviously to be distinguished, and switch element is also distinct with the particular circuit configurations of constant current unit in documents: in constant-current source 42, the grid of metal-oxide-semiconductor V2 is connected point pressure side of R3 and R4, the grid of breaker in middle unit M2 of the present invention connects R5.There is aforesaid difference in the working method that these structural differences result in the present invention and documents.
In sum, the technical problem that aforementioned comparison's file solves is how to improve the power factor exchanging driving LED, and the technical problem that the present invention solves is the flashing state that the multi-stage LED module how overcoming alternating current Direct driver occurs with voltage fluctuation.The technical problem that both solve is different, and the technological means adopted, the working method of drive circuit is also different.Therefore, aforementioned comparison's file does not have technology to enlighten to the present invention.
Summary of the invention
Technical problem to be solved by this invention, the shortcoming of the light-emitting flash caused for the direct driving LED light-emitting device of prior art alternating current exactly, a kind of LED light emission device of alternating current Direct driver is provided, overcome the LED scintillation that alternating current causes, and improve the efficiency of LED light emission device, extend the useful life of LED.
The present invention solve the technical problem, the technical scheme adopted is, the LED light emission device of alternating current Direct driver, comprise ac input end, protected location and rectification unit, it is characterized in that, first output of described rectification unit is connected to the second output, wherein n >=1 by n LED module and a switch element, and is integer; When n >=2, the passage also having switch element to form between every two LED modules is connected with the second output, and each switch element is connected with sampling unit;
Described ac input end for connecting alternating current, for device provides operating current;
Described protected location is connected with ac input end, for device provides defencive function;
Described rectification unit is connected with protected location, carries out rectification to the alternating current that protected location exports;
Described sampling unit is used for sampling to the output voltage of rectification unit, and outputs a control signal to each switch element;
Described switch element is connected with sampling unit, turns off according to the control signal that sampling unit exports or connects.
LED light emission device circuit of the present invention, is made up of the cascade of n level LED module, by shutoff and the turn-on voltage of the corresponding switch element of the suitable preset every one-level LED module of sampling unit, can avoid occurring scintillation when AC voltage fluctuations.Increase the quantity of LED module, be equivalent to the conducting voltage reducing every one-level LED module, improve the utilance of power supply.During the application of multi-stage LED module, when AC voltage fluctuations, the impact that each LED module is subject to adopts the impact of single module less relatively, and the stability of LED work is also better, and more reliably, the ability of anti-AC voltage fluctuations is stronger.
Concrete, described n LED module is made up of LED array.
Adopt LED array can form high-power LED module.
Further, described LED array is made up of at least 1 LED be arranged on same printed circuit board; Or integration packaging at least 1 LED is on the same substrate formed; Or integrated at least 1 LED is on the same semiconductor substrate formed.
Being arranged on same printed circuit board by LED all in LED module, is method for packing the most most economical under state-of-the-art; Or by LED integration packagings all in LED module on the same substrate, carry out secondary encapsulation by LED all in LED module, be integrated on same heat-radiating substrate; Or on the same semiconductor substrate integrated, this adopts semiconductor integrated circuit technique, and same semiconductor chip realizes the integrated of LED.These technology by the LED interlaced arrangement in each LED module, can also improve the uniformity of illuminating device luminous brightness, and are conducive to overcoming scintillation, and LED wiring is also more convenient.
Concrete, described LED is in parallel and/or be connected in series.
The connection combination that in LED module, LED is suitable, as parallel connection, series connection or series-parallel connection etc., more can adapt to the environment for use of alternating current Direct driver, adjust the electric current of each LED module, voltage parameter easily.
Concrete, described protected location comprises fuse and/or piezo-resistance, and described fuse is connected on ac input end, and described piezo-resistance is connected in parallel on ac input end.
Fuse is conventional current-limiting protection element, and piezo-resistance is then conventional voltage-limiting protection element, and their combination can complete the most basic current limliting and voltage-limiting protection, and cost is low, easy for installation, is convenient to carry out Two-level ensemble.
Further, described protected location also comprises common mode choke and/or gas discharge tube, and described common mode choke is connected on ac input end, and described gas discharge tube is connected in parallel on ac input end.
Common mode choke can suppress common mode disturbances, and gas discharge tube can protect lighting device not by injuries such as thunders and lightnings.
Concrete, the full-wave rectification that described rectification unit is made up of rectifier diode or half-wave rectifying circuit are formed.
Adopt rectifier diode as rectifier cell, small in volume, be convenient to Two-level ensemble encapsulation.
Concrete, described sampling unit is made up of resistor network.
Resistor network is applicable to gathering DC parameter very much, is convenient to configuration switch unit operating point.
Concrete, described switch element is made up of transistor, and described transistor controls pole is connected with sampling unit.
Transistor, as switch element, has and controls easily, contactless, long-life feature.
More specifically, described transistor is field-effect transistor or bipolar transistor, and described control is the grid of field-effect transistor or the base stage of bipolar transistor very.
Transistor switching element, technology maturation, is quick on the draw, reliable in action.
The invention has the beneficial effects as follows, use alternating electromotive force Direct driver LED module, circuit is simple, and volume is little, lightweight, and cost is low.By preset suitable shutoff voltage, realize alternating electromotive force Direct driver LED matrix and can not glimmer when AC voltage fluctuations.Further, when alternating current instantaneous voltage is too high, switch element turns off, and LED module is not luminous, improves the utilization ratio of power supply, reduces power consumption.Meanwhile, the situation also avoiding LED module to burn because electric current is excessive, extends the useful life of device.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of embodiment 1;
Fig. 2 is the circuit theory diagrams of embodiment 1;
Fig. 3 is the structured flowchart of embodiment 2;
Fig. 4 is the structured flowchart of embodiment 3;
Fig. 5 is the circuit theory diagrams of embodiment 3.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The LED light emission device of alternating current Direct driver of the present invention, comprises ac input end, protected location, rectification unit, sampling unit, switch element and n LED module, wherein n >=1, and is integer.In light-emitting device of the present invention, first output (being generally direct current output plus terminal) of rectification unit is connected to the second output (direct current output negative terminal) by n LED module and a switch element.When LED module quantity is more than 2, the passage also having switch element to form between every two LED modules is connected with the second output.Each switch element is connected with sampling unit, controls by it.LED light emission device circuit of the present invention, is made up of the cascade of n level LED module, by shutoff and the turn-on voltage of the corresponding switch element of the suitable preset every one-level LED module of sampling unit, can avoid occurring scintillation when AC voltage fluctuations.Increase the quantity of LED module, be equivalent to the conducting voltage reducing every one-level LED module, improve the utilance of power supply.During the application of multi-stage LED module, when AC voltage fluctuations, the impact that each LED module is subject to adopts the impact of single module less relatively, and the stability of LED work is also better, and more reliably, the ability of anti-AC voltage fluctuations is stronger.
Embodiment 1
See Fig. 1 and Fig. 2, this routine light-emitting device comprises ac input end 1, protected location 2, rectification unit 3, sampling unit 4, switch element 6 and LED module 5, and the quantity of this routine LED module 5 is 1 (i.e. n=1).First output of this routine rectification unit is direct current output plus terminal 31, and this anode 31 is connected to the second output direct current by LED module 5 switch element 6 and exports negative terminal 32.See Fig. 1.Ac input end 1 holds (phase line) and N to hold (zero line) to be connected with alternating current L, alternating current is introduced protected location 2.Protected location 2 provides basic defencive function to whole device, and be made up of piezo-resistance VR and fuse F, fuse F is connected in phase line, and piezo-resistance is connected in parallel between phase line and zero line, sees Fig. 2.For being applied to particular surroundings, protected location 2 also can comprise common mode choke and gas discharge tube.Common mode choke is connected on phase line and zero line, and gas discharge tube is generally connected in parallel between phase line and zero line.The full-wave rectifying circuit D that this routine rectification unit 3 is made up of rectifier diode forms, and carries out full-wave rectification to alternating current.This routine voltage sampling unit 4, the resistor network be made up of sampling resistor R1 and R2 is formed, the direct voltage exported by sampling rectification circuit D, control switch unit 6.As shown in Figure 2.This routine switch element 6 is made up of MOSFET (mos field effect transistor, be called for short field effect transistor) M1 and M2 and voltage stabilizing didoe DZ1, DZ2, resistance R3, R4 and R5.The array that this routine LED module 5 is made up of the LED of many series, parallel or series-parallel connection is formed, can be the multiple LED be arranged on same printed circuit board, or the multiple LEDs of integration packaging on same heat-radiating substrate, or the integrated circuit that integrated multiple LED are on the same semiconductor substrate formed.
When the instantaneous voltage of alternating current reaches the cut-in voltage of LED module 5, switch element 6 conducting under the driving of sampling unit 4, LED module 5 starts luminescence; When the instantaneous voltage of alternating current exceedes default shutoff voltage, switch element 6 turns off, and LED module 5 stops luminescence; When fluctuation appears in alternating current, within normal operating voltage range, time namely between the cut-in voltage and default shutoff voltage of LED module 5, the time point of the just turn-on and turn-off of switch element 6 changed, the luminescence of LED module 5 can not be glimmered.
As shown in Figure 2, rectification circuit D output plus terminal is connected with one end of resistance R1, is connected to the anode of LED module simultaneously, and the output negative terminal of rectification circuit D is as ground.The other end of resistance R1 is connected with the negative terminal of one end of resistance R2, voltage stabilizing didoe DZ1, one end of resistance R3; The other end of resistance R3 is connected with the grid of field effect transistor M1, and one end of the drain electrode of field effect transistor M1, one end of resistance R4, resistance R5, the negative terminal of voltage stabilizing didoe DZ2 connect.The other end of resistance R5 is connected with the grid of field effect transistor M2, and the negative terminal of the drain electrode of field effect transistor M2, the other end of resistance R4, LED module connects.The other end of resistance R2, the anode of voltage-stabiliser tube DZ1, the anode of voltage-stabiliser tube DZ2, the source electrode of field effect transistor M1, the source electrode of field effect transistor M2 be connected to (direct current output negative terminal).
When ac input end 1 is connected with electrical network, this lighting device obtains alternating electromotive force, through protected location 2, and by rectification unit 3, is rectified into direct current, is supplied to sampling unit 4, switch element 6 and LED module 5.In each ac cycle, rectification circuit D output voltage is started from scratch rising, and when voltage is elevated to the cut-in voltage of switch element, field effect transistor M1 turns off, M2 conducting, and LED module 5 starts luminescence; The electric current passed through along with input voltage rising LED module increases, and at voltage lower than the shutoff voltage stage of presetting, the undertension that sampling unit 4 exports is to make field effect transistor M1 conducting, and M1 keeps turning off, and M2 keeps conducting, LED module 5 continuous illumination; When voltage surprisingly raises, when exceeding default shutoff voltage, M1 starts conducting, and M2 turns off, and LED module is not luminous, and protection LED module 5 is from the impact of big current.
Embodiment 2
As shown in Figure 3, this routine light-emitting device LED module 5 has 2, switch element 6 is also 2, rectification unit 3 anode 31 (is labeled as switch element 2 by 2 LED modules and the 2nd switch element 6 in figure, other switch elements mark is similar) be connected with rectification unit 3 negative terminal 32, the passage having the 1st switch element 6 to form between the 1st LED module 5 and the 2nd LED module 5 is connected with rectification unit 3 negative terminal 32.This routine all switch element 6 is all connected with sampling unit 4.
Embodiment 3
As shown in Figure 4, this routine light-emitting device LED module 5 has 3, switch element 6 is also 3, rectification unit 3 anode 31 is connected with rectification unit 3 negative terminal 32 with the 3rd switch element 6 by 3 LED modules, the passage having the 1st switch element 6 to form between the 1st LED module 5 (be labeled as LED module 1 in figure, other LED modules mark is similar) and the 2nd LED module 5 is connected with rectification unit 3 negative terminal 32.The passage also having the 2nd switch element 6 to form between the 2nd LED module 5 and the 3rd LED module 5 is connected with rectification unit 3 negative terminal 32.This routine all switch element 6 is all connected with sampling unit 4.
The circuit theory diagrams of this routine device as shown in Figure 5, its operation principle and particular circuit configurations similar to Example 1, do not repeating herein.This routine sampling unit 4 is by resistance R1, R2; R6, R7; R11, R12 are formed; three switch elements 6; with 3 LED module groups, 5 one-tenth three grades of circuit; three switch elements 6 control three LED modules respectively, are arranged the turn-off time of every one-level switch by sampling unit 4 respectively, and protect corresponding LED module 5.Along with the increase of LED module quantity, be equivalent to the conducting voltage reducing each LED module, improve the utilance of power supply.During the application of multi-stage LED module, when AC voltage fluctuations, the impact that each LED module is subject to adopts the impact of single module less relatively, and the stability of LED work is also better, and more reliably, the ability of anti-AC voltage fluctuations is stronger.
Through above-mentioned explaination in detail, can find out that voltage sampling unit monitoring input voltage of the present invention also has the defencive function to LED module simultaneously.When large fluctuation appears in alternating voltage time, switch element also can disconnect in time, and protection LED module does not damage because electric current is excessive.
It should be noted that: although above-described embodiment has described structure of the present invention in detail, the present invention is not limited to above-described embodiment, the replacing structure of the routine that every those skilled in the art carry out according to foregoing description, all belongs to protection scope of the present invention.
Claims (7)
1. one kind exchanges the LED light device of driving, it comprises rectification unit, sampling unit, switch element and at least one LED module, first output of described rectification unit connects described sampling unit and a LED module, it is characterized in that, the first input end of described switch element connects the output of corresponding LED module, second input connects point pressure side of described sampling unit, the output of described switch element and the second output head grounding of described rectification unit;
Described switch element comprises the 3rd to the 5th resistance, the first and second voltage stabilizing didoes and the first and second field effect transistor, wherein
One end of 3rd resistance is connected to point pressure side of described sampling unit;
The negative terminal of the first voltage stabilizing didoe and point press bond of described sampling unit, positive ending grounding;
The grid of the first field effect transistor is connected to the other end of the 3rd resistance, source ground;
One end of the drain electrode of the first field effect transistor, one end of the 4th resistance, the 5th resistance is connected with the negative terminal of the second voltage stabilizing didoe;
The other end of the 5th resistance is connected with the grid of the second field effect transistor; Drain electrode, the other end of the 4th resistance of the second field effect transistor are connected with the negative terminal of the LED module of correspondence;
The anode of the second voltage stabilizing didoe and the source ground of the second field effect transistor.
2. LED light device as claimed in claim 1, it is characterized in that, the resistor network that described sampling unit is made up of sampling resistor is formed, and the shutoff voltage of and switch element that every one-level LED module corresponding preset by described sampling unit and turn-on voltage are to avoid occurring glimmering during AC voltage fluctuations.
3. LED light device as claimed in claim 2, it is characterized in that, the full-wave rectifying circuit that described rectification unit is made up of rectifier diode or half-wave rectifying circuit are formed.
4. LED light device as claimed in claim 3, it is characterized in that, described LED module is made up of LED array.
5. LED light device as claimed in claim 4, it is characterized in that, described LED array is made up of at least one LED be arranged on same printed circuit board; Or integration packaging at least one LED is on the same substrate formed; Or integrated at least one LED is on the same semiconductor substrate formed.
6. the LED light device as described in one of claim 1 to 5; it is characterized in that; described LED light device also comprises the protected location be made up of fuse and/or piezo-resistance, and described fuse is connected on ac input end, and described piezo-resistance is connected in parallel on ac input end.
7. LED light device as claimed in claim 6, it is characterized in that, described protected location also comprises common mode choke and/or gas discharge tube, and described common mode choke is connected on ac input end, and described gas discharge tube is connected in parallel on ac input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353228.3A CN104918387B (en) | 2011-12-31 | 2011-12-31 | A kind of LED light device of exchange driving |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110457843.0A CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
| CN201510353228.3A CN104918387B (en) | 2011-12-31 | 2011-12-31 | A kind of LED light device of exchange driving |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110457843.0A Division CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104918387A true CN104918387A (en) | 2015-09-16 |
| CN104918387B CN104918387B (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510353228.3A Active CN104918387B (en) | 2011-12-31 | 2011-12-31 | A kind of LED light device of exchange driving |
| CN201110457843.0A Active CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
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| CN201110457843.0A Active CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
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| WO (1) | WO2013097692A1 (en) |
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| CN104540287B (en) * | 2012-10-30 | 2017-11-17 | 四川新力光源股份有限公司 | LED dimming driving circuits |
| CN102892238B (en) * | 2012-10-30 | 2015-02-04 | 四川新力光源股份有限公司 | Dimming drive circuit of AC (Alternating Current) direct drive LED module |
| CN104427688B (en) * | 2013-08-23 | 2016-09-28 | 四川新力光源股份有限公司 | LED alternating-current drive circuit |
| CN104936330B (en) * | 2014-03-18 | 2020-05-19 | 赵依军 | LED driving power supply and LED lighting device comprising same |
| FR3020122B1 (en) * | 2014-04-22 | 2018-07-13 | Renault S.A.S. | METHOD FOR CONTROLLING A LIGHT EMITTING DIODE LIGHT OR SIGNALING LIGHT FOR A MOTOR VEHICLE |
| CN104519645B (en) * | 2014-11-27 | 2019-01-08 | 上海航空电器有限公司 | A kind of guide-lighting drive circuit based on PWM light modulation |
| CN104582137B (en) * | 2014-11-28 | 2019-01-04 | 上海航空电器有限公司 | The multi-level dimming circuit of three kinds of alarm signals |
| US9913325B1 (en) * | 2017-02-03 | 2018-03-06 | Semiconductor Components Industries, Llc | LED direct AC drive circuit |
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| CN102186282A (en) * | 2011-03-21 | 2011-09-14 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN102209415A (en) * | 2011-05-30 | 2011-10-05 | 桂林源通网络软件有限公司朝阳路分公司 | Light emitting diode (LED) alternating-current direct power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013097692A1 (en) | 2013-07-04 |
| CN103188845A (en) | 2013-07-03 |
| CN103188845B (en) | 2015-08-05 |
| CN104918387B (en) | 2019-02-12 |
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