CN101521978A - Adjustable-light output circuit and electronic ballast used for a lamp - Google Patents
Adjustable-light output circuit and electronic ballast used for a lamp Download PDFInfo
- Publication number
- CN101521978A CN101521978A CN200810082333A CN200810082333A CN101521978A CN 101521978 A CN101521978 A CN 101521978A CN 200810082333 A CN200810082333 A CN 200810082333A CN 200810082333 A CN200810082333 A CN 200810082333A CN 101521978 A CN101521978 A CN 101521978A
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- 238000007600 charging Methods 0.000 claims abstract description 13
- 230000005669 field effect Effects 0.000 claims description 17
- 230000010354 integration Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 33
- 230000010355 oscillation Effects 0.000 abstract description 8
- 238000004804 winding Methods 0.000 description 24
- 229910052736 halogen Inorganic materials 0.000 description 14
- 150000002367 halogens Chemical class 0.000 description 13
- 230000002457 bidirectional effect Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 230000001960 triggered effect Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- -1 12V halogen Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Classifications
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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
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/041—Controlling the light-intensity of the source
- H05B39/044—Controlling the light-intensity of the source continuously
- H05B39/045—Controlling the light-intensity of the source continuously with high-frequency bridge converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention discloses an adjustable-light output circuit used for a lamp. The adjustable-light output circuit comprises a self-excited oscillation circuit and a start-triggering circuit, wherein the start-triggering circuit comprises start capacitors capable of adjusting charging time, so that the self-excited oscillation circuit can generate different output voltages. The invention also discloses an electronic ballast using the adjustable-light output circuit. The invention can realize the adjustment of light with different brightness in a bulb in a simple way, and does not need a complex light-adjusting circuit.
Description
Technical field
The present invention relates to a kind of adjustable-light output circuit and electric ballast that is used for lamp, belong to lighting technical field.
Background technology
The designing requirement of some lamps at present can provide different intensity levels, such as night-light.Utilize 2 to close the solution that 1 formula Halogen lamp LED reduces cost in having proposed in a kind of existing night-light design, this solution provides two kinds of intensity levels in a lamp, and low luminance level is realized by the light-emitting diode of 4 0.2W/20mA that polyphone connects; High brightness levels increases a 20W/12V halogen lamp head realization by the light-emitting diode of 4 0.2W/20mA, and the switch between low luminance level and high brightness levels is by the digital circuit part control with IC HEF4013 (two D flip-flop).The user can install the switching that on-off switch on the wall realizes exporting intensity level by control.But,, thereby wish to find out a kind of solution in the industry and replace 4 light-emitting diodes in the said method in view of 4 light-emitting diodes in this night-light still have higher cost.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of adjustable-light output circuit and electric ballast that is used for lamp, utilizes the different output voltages of this circuit to realize that the light of different brightness in the lamp holder regulates.
For this reason, the invention provides a kind of adjustable-light output circuit that is used for lamp, comprising:
Self-maintained circuit, described self-maintained circuit further comprises: active half-bridge circuit, passive half-bridge circuit and resonance group, wherein said resonance group connects described passive half-bridge circuit and active half-bridge circuit mid point, and provides output voltage to lamp; And
Start triggering circuit, this start triggering circuit comprise the startup electric capacity with adjustable charging interval, so that described self-maintained circuit produces different output voltages.
Further, described start triggering circuit comprises the integration charging circuit, the described startup electric capacity of connecting between its outside input and ground.
Further, described startup electric capacity comprises further: first starts electric capacity and second starts electric capacity, and it is in parallel that the described second startup electric capacity and first starts electric capacity, and control its access by switching circuit.
Further, described switching circuit comprises a field-effect transistor.
The present invention also provides a kind of electric ballast, comprises adjustable-light output circuit, and described adjustable-light output circuit comprises further:
Self-maintained circuit, described self-maintained circuit further comprises: active half-bridge circuit, passive half-bridge circuit and resonance group, wherein said resonance group connects described passive half-bridge circuit and active half-bridge circuit mid point, and provides output voltage to lamp; And
Start triggering circuit, this start triggering circuit comprise the startup electric capacity with adjustable charging interval, so that described self-maintained circuit produces different output voltages.
The present invention does not need complicated light adjusting circuit just can realize the light adjusting of different brightness in the lamp holder by changing the output voltage that the charging interval that starts electric capacity in the start triggering circuit changes self-maintained circuit thus.
Description of drawings
Fig. 1 is the Halogen lamp LED adjustable-light output circuit schematic diagram of the embodiment of the invention;
Fig. 2 is an input voltage in the Halogen lamp LED adjustable-light output circuit of the embodiment of the invention, the oscillogram of output voltage;
Fig. 3 is halogen lamp head output voltage waveforms and the input current waveform when starting electric capacity only for C2 in the embodiment of the invention;
Fig. 4 is halogen lamp head output voltage waveforms and the input current waveform when starting electric capacity for (C2+Cn) in the embodiment of the invention.
Embodiment
As everyone knows, halogen lamp head is a kind of linear resistive element, and the brightness of its output is the operating voltage that depends on its lamp holder, thus, design philosophy of the present invention promptly is to change operating voltage on the lamp holder by the operating time that changes half-bridge switch, thereby the brightness of Halogen lamp LED is changed.
Below in conjunction with the drawings and specific embodiments the present invention is done to introduce further, but not as a limitation of the invention.
With reference to shown in Figure 1, be the Halogen lamp LED adjustable-light output circuit schematic diagram of the embodiment of the invention, as can be seen from the figure, this circuit be input as DC, ground is PowerGND, and it comprises active half-bridge circuit, passive half-bridge circuit, start triggering circuit, resonance group, is specially:
Active half-bridge circuit, form by NPN type the first transistor T1, NPN type transistor seconds T2 and resistance R 3, R4, and the emitter of the first transistor T1 is connected with the collector electrode of transistor seconds T2 by resistance R 3, the collector electrode of the first transistor T1 is connected with circuit input DC, and the emitter of transistor seconds T2 is connected with ground PowerGND by resistance R 4;
Passive half-bridge circuit is made up of capacitor C 4, the C5 of mutual series connection, and the other end of capacitor C 4, C5 is connected with circuit input DC and ground PowerGND respectively;
Start triggering circuit is made up of the first startup capacitor C 2, the second startup capacitor C n, field effect transistor M 1, resistance R 7, bidirectional trigger diode DB3, diode D1, resistance R 1a, R2a, R2b; Resistance R 1a, R2a, the first startup capacitor C 2 are connected between the input DC and ground PowerGND of this circuit successively, diode D1 forward is coupling in first and starts between capacitor C 2 and resistance R 2a intermediate point and the transistor seconds T2 collector electrode, and resistance R 2b is coupling between resistance R 2a and the diode D1 negative pole; One end of resistance R 7 and first starts capacitor C 2 and is connected with the second parallel connection point that starts capacitor C n, and the other end is connected with bidirectional trigger diode DB3, and the bidirectional trigger diode DB3 other end is connected with transistor seconds T2 base stage; Second starts capacitor C n and source electrode, the drain electrode of field effect transistor M 1, and to form be connected in series back and the first startup capacitor C 2 in parallel, and the gate voltage of field effect transistor M 1 is controlled by external signal; In this circuit, the first startup capacitor C 2, the second startup capacitor C n, field effect transistor M1, resistance R 1a, R2a have constituted the variable integration charging circuit of time constant jointly;
The resonance group, by first transformer that comprises the first winding TA, the second winding TB, tertiary winding TC, and the second transformer L2, resistance R 5, R6, Rx and Ry form; The end of the first winding TA is connected with the base stage of the first transistor T1 by the resistance R 5 of series connection with it, and the other end is connected with the base stage of transistor seconds T2; The end of the second winding TB is connected with the collector electrode of transistor seconds T2, and the other end is connected with the former limit of the second transformer L2; The end of tertiary winding TC is connected with the base stage of transistor seconds T2 by the resistance R 6 of series connection with it, and the other end is connected with ground PowerGND; Wherein, the end that is connected with resistance R 6 of the end that is connected with transistor seconds T2 collector electrode of the first winding TA, a end that the second winding TB is connected with the second transformer L2 and the second winding TC is an end of the same name; The secondary of the second transformer L2 is a circuit output end; In addition, also between the base stage of the first transistor T1 and emitter, resistance R x is set, between the base stage of transistor seconds T2 and emitter, resistance R y is set, to guarantee that the first transistor T1 and the base stage of transistor seconds T2 and the electric charge of inter-collector can reliably unload, and make this circuit can be operated in fine dimming state;
In above-mentioned adjustable-light output circuit, described active half-bridge circuit, passive half-bridge circuit and resonance group have been formed self-maintained circuit jointly, and start triggering circuit is in the first charging capacitor both end voltage during greater than predetermined voltage threshold (that is: the breakover voltage of bidirectional trigger diode DB3), trigger and start described self-maintained circuit generation vibration, otherwise, the failure of oscillations.
With reference to figure 1 and Fig. 2 the operation principle of above-mentioned Halogen lamp LED adjustable-light output circuit is made an explanation, as follows, wherein, input voltage VDC, the halogen lamp head output voltage waveforms when starting electric capacity only for C2 and the input current waveform of this circuit and halogen lamp head output voltage waveforms and input current waveform when starting electric capacity for (C2+Cn) have been shown among Fig. 2:
(1) when field-effect transistor M1 is in off state
After entire circuit powers on, the voltage of VDC begins to increase by 0, this power supply is by resistance R 1a, R2a starts capacitor C 2 chargings to first, rise to the breakover voltage (approximately about 32V) of bidirectional trigger diode DB3 when first voltage that starts capacitor C 2 two ends after, this bidirectional trigger diode DB3 avalanche breakdown, at this moment, first starts the base stage → emitter discharge of capacitor C 2 by transistor seconds T2, transistor seconds T2 is because of the conducting of emitter junction positively biased, in transistor seconds T2 conduction period, the current path in the entire circuit is: collector and emitter → resistance R 4-ground PowerGND of former limit → second winding TB → transistor seconds T2 of input DC → capacitor C 4 → the second transformer L2.The instantaneous variation of transistor seconds T2 collector current is di/dt, produce corresponding induced electromotive force (at this moment by the first winding TA and tertiary winding TC, each winding is identical with the end polarity of the same name of " point " sign), thus, the base potential of transistor seconds T2 raises, its base current and collector current further increase, and under the effect of above-mentioned positive feedback, transistor seconds T2 conducting is also saturated.After transistor seconds T2 conducting was saturated, first started the emitter junction discharge of capacitor C 2 by bidirectional trigger diode DB3, diode D1 and transistor seconds T2, and no longer the base current of transistor seconds T2 was produced any influence.
As seen, the first startup capacitor C 2, resistance R 7, bidirectional trigger diode DB3, diode D1, resistance R 1a, R2a, R2b provide condition for the starting of oscillation of circuit in the start triggering circuit, promptly after entire circuit powers on, work to transistor seconds T2 plays trigger action, after the circuit starting of oscillation, the positive feedback that is provided by the first winding TA, the second winding TB, tertiary winding TC realizes vibration.After transistor seconds T2 reaches capacity, the first winding TA, the second winding TB, induced electromotive force among the tertiary winding TC drops to zero, the base potential of transistor seconds T2 begins to descend, its base current descends, cause collector current also to descend, and the base potential of the first transistor T1 begins to rise at this moment, because the effect of positive feedback, transistor seconds T2 is ended, saturated and the conducting of the first transistor T1, in the first transistor T1 conduction period, the current path in the entire circuit is: former limit → capacitor C 5 → ground PowerGND of collector and emitter → resistance R 3 → the second winding TB → second transformer L2 of input DC → the first transistor T1.Behind the first transistor T1 saturation conduction, cause each winding of first transformer to enter the magnetic saturation state again.Same, again make transistor seconds T2 saturated owing to the positive feedback effect that the first winding TA, the second winding TB, tertiary winding TC are provided this moment, and the first transistor T1 ends.So, go round and begin again, the first transistor T1 and transistor seconds T2 replace saturated ending, make this circuit enter oscillatory regime, that is, will be at the alternating voltage that forms between the mid point of active half-bridge circuit and passive half-bridge circuit through after the second transformer L2 conversion, also produce one at the secondary of the second transformer L2 and offer the outside alternating voltage that uses, it can directly offer halogen lamp head, and lamp is lighted.
After above-mentioned circuit starting of oscillation, when input voltage VDC when being decreased to 0 greatly gradually because input terminal voltage is zero, obviously vibration stops, the output of this circuit also stops.And begin to increase by 0 with reaching input voltage VDC, this moment, this circuit repeated the above-mentioned course of work.
(2) when field-effect transistor M1 is in conducting state
As field-effect transistor M1 externally under the control signal effect during conducting, as can be seen from Figure 1, the whole startup electric capacity of this circuit of this moment will increase and be (C2+Cn), circuit working principle when the operation principle of this circuit is similar to the above field effect transistor M of narrating 1 and is in off state does not repeat them here.
In contrast to above-mentioned two kinds of situations that field effect transistor M 1 is in shutoff and conducting, as can be seen, after field-effect transistor M1 conducting, owing to incorporated capacitor C n into, make the actual startup electric capacity of this circuit be (C2+Cn), single first capacitor value that starts capacitor C 2 when the capacitor value that should start electric capacity (C2+Cn) this moment turn-offs greater than field effect transistor M 1, so for the former charging interval obviously greater than the latter, and the time that makes the magnitude of voltage at above-mentioned electric capacity two ends reach the breakover voltage value of bidirectional trigger diode DB3 also obviously can increase, and promptly starting the triggered time increases; And for the power supply of input, the cycle of its input value is fixed, and comprises starting triggered time and duration of oscillation in one-period, obviously increase when starting the triggered time, duration of oscillation must reduce, and thus, the voltage output effective value that produces at the secondary of the second transformer L2 obviously reduces.Schematically first capacitor value that starts capacitor C 2 is chosen to be 5.6nF, second capacitor value that starts capacitor C n is chosen to be 220nF, then when field-effect transistor M1 turn-offs, the output voltage waveforms of described circuit and input current waveform are as shown in Figure 3, this moment, the lamp wattage was 21W, when field-effect transistor M1 conducting, the output voltage waveforms of described circuit and input current waveform as shown in Figure 4, this moment, the lamp wattage was 6W.As shown in table 1 for the detailed circuit parameter under two kinds of situations that above-mentioned parameter exemplified:
Table 1
| Project | Vi | Ii | Wi | PF | Vo | Io | Fo |
| C2(5.6nF) | 230V/50Hz | 94mA 94mA | 21.3W | 0.98 | 11.9V | 1.6A | 81KHz |
| C2+Cn(225.6nF) | 230V/50Hz | 49mA | 5.9W | 0.52 | 5V | 1A | 46KHz |
In other embodiment of the present invention, can also change the integration circuit time constant that starts capacitor C 2 chargings to first by the resistance that changes R1a, R2a, thereby change the startup triggered time of above-mentioned adjustable-light output circuit, change the output voltage of this circuit with this; Perhaps can also start capacitor C 2 and replace with adjustable condenser first, change the startup triggered time of above-mentioned adjustable-light output circuit by this first capacitor value that starts electric capacity of direct change, change the output voltage of this circuit with this, can not need to be provided with again second this moment and start capacitor C n and field effect transistor M 1.In addition, the field effect transistor M 1 in the foregoing description also can be by realizing that the switching circuit of on-off action substitutes, and does not repeat them here according to control signal in the prior art.
In addition, the above embodiment of the present invention carries out the light modulation of halogen lamp head by the triggered time that changes adjustable-light output circuit, and no longer needs independent dimmer.Based on similar principles, can also be in the light adjusting circuit of the light modulation of LED lamp even high-pressure discharge (HID) lamp with circuit application proposed by the invention, certainly in other application, need peripheral circuit to be carried out corresponding transformation according to the characteristic of various lamps, for example, for the LED lamp, the output voltage of the second transformer L2 secondary in the foregoing circuit need be carried out offer the LED lamp again after the rectification, these transformations all belong to the ABC that persons skilled in the art are known, and do not repeat them here.
Further, can also be according to the invention provides a kind of electric ballast, this electric ballast comprises the adjustable-light output circuit that the foregoing description proposes.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. adjustable-light output circuit that is used for lamp comprises:
Self-maintained circuit, described self-maintained circuit further comprises: active half-bridge circuit, passive half-bridge circuit and resonance group, wherein said resonance group connects described passive half-bridge circuit and active half-bridge circuit mid point, and provides output voltage to lamp; And
Start triggering circuit, this start triggering circuit comprise the startup electric capacity with adjustable charging interval, so that described self-maintained circuit produces different output voltages.
2. adjustable-light output circuit as claimed in claim 1, wherein, described start triggering circuit comprises the integration charging circuit, the described startup electric capacity of connecting between its outside input and ground.
3. adjustable-light output circuit as claimed in claim 2, wherein, described startup electric capacity comprises further: first starts electric capacity and second starts electric capacity, and it is in parallel that the described second startup electric capacity and first starts electric capacity, and control its access by switching circuit.
4. adjustable-light output circuit as claimed in claim 1, wherein, described switching circuit comprises a field-effect transistor.
5. an electric ballast comprises adjustable-light output circuit, and described adjustable-light output circuit comprises further:
Self-maintained circuit, described self-maintained circuit further comprises: active half-bridge circuit, passive half-bridge circuit and resonance group, wherein said resonance group connects described passive half-bridge circuit and active half-bridge circuit mid point, and provides output voltage to lamp; And
Start triggering circuit, this start triggering circuit comprise the startup electric capacity with adjustable charging interval, so that described self-maintained circuit produces different output voltages.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810082333A CN101521978A (en) | 2008-02-29 | 2008-02-29 | Adjustable-light output circuit and electronic ballast used for a lamp |
| PCT/IB2009/050731 WO2009107057A1 (en) | 2008-02-29 | 2009-02-24 | Dimming circuit and electronic ballast for a lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810082333A CN101521978A (en) | 2008-02-29 | 2008-02-29 | Adjustable-light output circuit and electronic ballast used for a lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101521978A true CN101521978A (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810082333A Pending CN101521978A (en) | 2008-02-29 | 2008-02-29 | Adjustable-light output circuit and electronic ballast used for a lamp |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101521978A (en) |
| WO (1) | WO2009107057A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932173A (en) * | 2009-06-22 | 2010-12-29 | 奥斯兰姆有限公司 | Converter device for driving light source, related method and computer program product |
| CN103220870A (en) * | 2012-01-18 | 2013-07-24 | 台达电子企业管理（上海）有限公司 | Electronic ballast |
| CN103313493A (en) * | 2012-03-07 | 2013-09-18 | 张玉清 | Electronic ballast with adjustable luminance |
| CN105101594A (en) * | 2014-05-06 | 2015-11-25 | 张玉清 | Dual-control dimming electronic ballast |
| CN107040255A (en) * | 2015-12-29 | 2017-08-11 | 英飞凌科技股份有限公司 | System and method for switchable capacitors |
| CN107613626A (en) * | 2017-10-25 | 2018-01-19 | 苏州纽克斯电源技术股份有限公司 | Output detection protection circuit and HID lamp AC electronic ballast |
| CN109819543A (en) * | 2017-11-21 | 2019-05-28 | 通用电气照明解决方案有限公司 | LED illumination component and its driving circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144202A (en) * | 1983-04-22 | 1992-09-01 | Nilssen Ole K | High-frequency power supply for incandescent lamp |
| DE4021640A1 (en) * | 1990-07-06 | 1992-01-09 | Zumtobel Ag | BRIGHTNESS CONTROL CIRCUIT ARRANGEMENT |
| US6853154B2 (en) * | 2002-04-30 | 2005-02-08 | Koninklijke Philips Electronics N.V. | Open loop bi-level ballast control |
-
2008
- 2008-02-29 CN CN200810082333A patent/CN101521978A/en active Pending
-
2009
- 2009-02-24 WO PCT/IB2009/050731 patent/WO2009107057A1/en active Application Filing
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932173A (en) * | 2009-06-22 | 2010-12-29 | 奥斯兰姆有限公司 | Converter device for driving light source, related method and computer program product |
| CN101932173B (en) * | 2009-06-22 | 2013-09-11 | 奥斯兰姆有限公司 | A converter device for driving light sources, related method and computer program product |
| CN103220870A (en) * | 2012-01-18 | 2013-07-24 | 台达电子企业管理（上海）有限公司 | Electronic ballast |
| CN103220870B (en) * | 2012-01-18 | 2015-09-16 | 台达电子企业管理（上海）有限公司 | Electric stabilizer |
| CN103313493A (en) * | 2012-03-07 | 2013-09-18 | 张玉清 | Electronic ballast with adjustable luminance |
| CN105101594A (en) * | 2014-05-06 | 2015-11-25 | 张玉清 | Dual-control dimming electronic ballast |
| CN105101594B (en) * | 2014-05-06 | 2020-02-25 | 张玉清 | Double-control dimming electronic ballast |
| CN107040255A (en) * | 2015-12-29 | 2017-08-11 | 英飞凌科技股份有限公司 | System and method for switchable capacitors |
| CN107613626A (en) * | 2017-10-25 | 2018-01-19 | 苏州纽克斯电源技术股份有限公司 | Output detection protection circuit and HID lamp AC electronic ballast |
| CN109819543A (en) * | 2017-11-21 | 2019-05-28 | 通用电气照明解决方案有限公司 | LED illumination component and its driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009107057A1 (en) | 2009-09-03 |
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Open date: 20090902 |