CN101868105B - Electronic ballast and overvoltage protection method thereof - Google Patents
Electronic ballast and overvoltage protection method thereof Download PDFInfo
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- CN101868105B CN101868105B CN2010101921123A CN201010192112A CN101868105B CN 101868105 B CN101868105 B CN 101868105B CN 2010101921123 A CN2010101921123 A CN 2010101921123A CN 201010192112 A CN201010192112 A CN 201010192112A CN 101868105 B CN101868105 B CN 101868105B
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Abstract
The invention provides an electronic ballast and an overvoltage protection method thereof; whether the overvoltage exists or not is judged by monitoring the electrical parameter of an inductor; and a high-voltage part of a printed circuit board of the electronic ballast has small area, high safety factors, easy wiring and strong anti-interference capability. The electronic ballast comprises an inverter circuit, a first capacitor, the inductor, a second capacitor, a control circuit and an overvoltage detection circuit, wherein the inverter circuit comprises at least one electronic switch and generates alternating-current voltage by the at least one electronic switch so as to drive a gas discharge lamp; one end of the first capacitor is connected to the inverter circuit in series; the inductor is electrically coupled between the other end of the first capacitor and the gas discharge lamp; the second capacitor is connected with the gas discharge lamp in parallel; the control circuit is electrically coupled to the inverter circuit to control the switching-on and switching-off of the at least one electronic switch; the overvoltage detection circuit is electrically coupled to the inductor; and whether the voltage at the two ends of the gas discharge lamp exists or not is judged by monitoring the electrical parameter of the inductor, if so, the control circuit switches off the converter circuit.
Description
Technical field
The present invention relates to a kind of electric ballast, relate in particular to a kind of electric ballast and over-voltage protection method thereof.
Background technology
Gaseous discharge lamp, as fluorescent lamp, high-pressure sodium lamp, metal halide lamp etc., need electric ballast that AC drive voltage is provided so that its normal operation usually.Usually, electric ballast is usingd electrical network or battery as power supply, is a direct current input voltage by the ac grid voltage or the dc-battery voltage transitions that receive, then by inverter circuit, this DC input voitage is converted to required AC drive voltage.
The driving voltage difference that gaseous discharge lamp needs at different working stages, it needs higher driving voltage (not waited to several ten thousand volts by several hectovolts according to the difference of the characteristic and application occasion of lamp) at ignition phase, and the operating voltage under stable state is lower (for example being less than 200 volts).The terminal voltage of gaseous discharge lamp can not be too high, in order to avoid cause the damage of lamp and other components and parts.The terminal voltage that over-voltage protection method commonly used is the sample gas discharge lamp also produces a voltage sampling signal.If this voltage sampling signal is greater than a preset value, is judged as and has over-voltage condition, and take corresponding overvoltage protection measure.Adopt the electric ballast of the method to need high-voltage capacitor or high voltage resistor to be sampled, the area of its printed circuit board (PCB) high-pressure section is large, and coefficient of safety is low, and the insulation distance between device is had higher requirements, and is unfavorable for the miniaturization of electric ballast.
Summary of the invention
The technical problem to be solved in the present invention is to provide the high and wiring of a kind of coefficient of safety and is easy to electric ballast and over-voltage protection method thereof.
In order to solve the problems of the technologies described above, the invention provides a kind of electric ballast, comprising: inverter circuit, comprise at least one electronic switch, the conducting by described at least one electronic switch produces alternating voltage with gas discharge lamp with turn-offing; The first capacitor, the one end is connected to described inverter circuit; Inductor, be electrically coupled between the other end and described gaseous discharge lamp of described the first capacitor; The second capacitor, in parallel with described gaseous discharge lamp; Control circuit, be electrically coupled to described inverter circuit, controls conducting and the shutoff of described at least one electronic switch; And over-voltage detection circuit, be coupled to described inductor, judge by the electrical quantity of monitoring described inductor whether the voltage at described gaseous discharge lamp two ends exists overvoltage; If wherein there is overvoltage, described control circuit cuts out described inverter circuit.
Wherein said over-voltage detection circuit comprises: sample circuit, be coupled to described inductor, and the electrical quantity of the described inductor of sampling, and produce the sampled signal that represents this electrical quantity; And comparison circuit, be electrically coupled to described sample circuit, described sampled signal and threshold value are compared; If wherein described sampled signal is greater than described threshold value, is judged as and has overvoltage.
The sample voltage at described inductor two ends of wherein said sample circuit.
Wherein said sample circuit comprises: coupling inductor, with described inductor magnetic coupling; And rectification circuit, be electrically coupled to described coupling inductor, the voltage at described coupling inductor two ends is carried out to rectification, and produce described sampled signal.
Wherein said sample circuit sample streams is crossed the electric current of described inductor.
Wherein said sample circuit comprises that series electrical is coupled to the sampling resistor in described inductor loop.
Wherein said sample circuit comes sample streams to cross the electric current of described inductor by current transformer.
Wherein said sample circuit comprises: current transformer, and the former limit coupled in series of described current transformer is to the loop of described inductor; Rectification circuit, be electrically coupled to the secondary of described current transformer, and the electric current that flows through described current transformer secondary is carried out to rectification; And resistor, being electrically connected to the output of described rectification circuit, the voltage at described resistor two ends is described sampled signal.
Wherein said inverter circuit adopts half-bridge topology, comprises the first electronic switch and the second electronic switch that are connected in series.
Wherein close described inverter circuit and comprise described the first and second electronic switches of shutoff.
Wherein close described inverter circuit and comprise described the first electronic switch of shutoff described the second electronic switch of conducting.
In order to solve the problems of the technologies described above, the present invention also provides a kind of over-voltage protection method of electric ballast, wherein said electric ballast comprises inverter circuit and the electric coupling inductor described inverter circuit and gaseous discharge lamp between of generation alternating voltage with gas discharge lamp, and the method comprises: the electrical quantity of monitoring described inductor; Whether the voltage that judges described gaseous discharge lamp two ends based on monitoring result exists overvoltage; And if have overvoltage, close described inverter circuit.
Wherein by the electrical quantity of monitoring described inductor, judge whether the voltage at described gaseous discharge lamp two ends exists overvoltage to comprise: the electrical quantity of the described inductor of sampling also produces the sampled signal of this electrical quantity; And described sampled signal and threshold value are compared; If wherein described sampled signal is greater than described threshold value, is judged as and has overvoltage.
The voltage that the electrical quantity of wherein said inductor is described inductor two ends.
The electrical quantity of wherein said inductor is the electric current that flows through described inductor.
Wherein said inverter circuit adopts half-bridge topology, comprises the first electronic switch and the second electronic switch that are connected in series.
Wherein close described inverter circuit and comprise described the first and second electronic switches of shutoff.
Wherein close described inverter circuit and comprise described the first electronic switch of shutoff described the second electronic switch of conducting.
The present invention adopts circuit and/or the said method of said structure, electrical quantity by the monitoring inductor judges whether to exist overvoltage, its sample circuit is without high-voltage capacitor or resistor, thereby the area of the printed circuit board (PCB) high-pressure section of electric ballast is little, coefficient of safety is high, and easily, antijamming capability is strong in wiring.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described:
The block diagram that Fig. 1 is electric ballast of the present invention;
The circuit diagram of the first execution mode that Fig. 2 is electric ballast of the present invention;
The circuit diagram of the second execution mode that Fig. 3 is electric ballast of the present invention;
The circuit diagram of the 3rd execution mode that Fig. 4 is electric ballast of the present invention;
The circuit diagram of the 4th execution mode that Fig. 5 is electric ballast of the present invention;
The flow chart of the ignition method that Fig. 6 is electric ballast of the present invention.
Embodiment
Below will describe specific embodiments of the invention in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the present invention.
The block diagram that Fig. 1 is electric ballast of the present invention, comprise voltage conversion circuit 100, inverter circuit 101, control circuit 102, series capacitor C
s, shunt capacitor C
p, inductor L and over-voltage detection circuit 110.Voltage conversion circuit 100 receives the input voltage V that comes from electrical network or battery
in, and be converted into DC input voitage V
dc.Voltage conversion circuit 100 can comprise in rectifier bridge, DC/DC conversion circuit, ac/dc translation circuit one or wherein several combination.Inverter circuit 101 is electrically coupled to voltage conversion circuit 100, comprises at least one electronic switch, the conducting by electronic switch with turn-off DC input voitage V
dcbe converted to alternating voltage.This alternating voltage is by series capacitor C
s, shunt capacitor C
pthe resonant network formed with inductor L produces AC drive voltage at the lamp two ends.Inverter circuit 101 can adopt any AC/DC transformation topology structure, such as full-bridge topologies, half-bridge topology etc.Control circuit 102 is electrically coupled to inverter circuit 101, controls conducting and the shutoff of this at least one electronic switch.Over-voltage detection circuit 110 is coupled to inductor L, by the electrical quantity of monitoring inductor L, judges whether to exist overvoltage.If there is overvoltage, control circuit 102 cuts out inverter circuit 101.In one embodiment, inverter circuit 101 adopts half-bridge topology, comprise the first electronic switch and the second electronic switch that are connected in series, close inverter circuit 101 and can be the first and second electronic switches are all turn-offed, also can be and turn-off the first electronic switch and conducting the second electronic switch.
In one embodiment, over-voltage detection circuit 110 comprises sample circuit 103 and comparison circuit 104.Sample circuit 103 is coupled to inductor L, the electrical quantity of sampling inductor L, and produce the sampled signal SENSE that represents this electrical quantity.The electrical quantity of inductor L comprises the voltage at inductor L two ends or flows through the electric current of inductor L.Comparison circuit 104 is electrically coupled to sample circuit 103, sampled signal SENSE and a threshold value is compared, and produce overvoltage signal OV.If sampled signal SENSE is greater than this threshold value, overvoltage signal OV effectively (low level " 0 " or high level " 1 ").Control circuit 102 receives overvoltage signal OV, if overvoltage signal OV is effective, control circuit 102 cuts out inverter circuit 101, realizes overvoltage protection.
When discharge lamp is not lighted or do not access, lamp presents open-circuit condition.Due to series capacitor C
s, shunt capacitor C
pwith inductor L, in resonance condition, when the amplitude increase of voltage of both ends of lamp, the amplitude that flows through the electrical quantity of inductor L also increases, and vice versa.Thereby can learn by the electrical quantity of monitoring inductor L whether the voltage at lamp two ends exists overvoltage.The electrical quantity of by sample circuit of the present invention, monitoring inductor L is without high-voltage capacitor or resistor, thereby the area of the printed circuit board (PCB) high-pressure section of electric ballast is little, and coefficient of safety is high, and wiring easily, and antijamming capability is strong.
If there is overvoltage in the voltage at gaseous discharge lamp two ends, the corresponding increase of the voltage at inductor L two ends meeting, make sampled signal SENSE be greater than threshold value V
th1, overvoltage signal OV is effective, is low level.With door AND1 and the equal output low level of AND2, electronic switch S1 and S2 are turn-offed, realize overvoltage protection.
The circuit diagram of the second execution mode that Fig. 3 is electric ballast of the present invention, wherein inverter circuit 301, comparison circuit 304 and current sampling circuit 305 are all identical with appropriate section in circuit shown in Fig. 2.The voltage at sample circuit 303 sampling inductor L two ends, comprise coupling inductor L
couplehalf-wave rectifying circuit with diode D5 formation.Coupling inductor L
couplemagnetic coupling is to inductor L.Half-wave rectifying circuit is electrically coupled to coupling inductor L
couple, to coupling inductor L
couplethe voltage at two ends carries out halfwave rectifier, and produces sampled signal SENSE.
If there is overvoltage in the voltage at gaseous discharge lamp two ends, the corresponding increase of the voltage at inductor L two ends meeting, make sampled signal SENSE be greater than threshold value V
th1, overvoltage signal OV is effective, is low level.With door AND1 output low level, electronic switch S1 is turn-offed, realize overvoltage protection, and now or door OR1 output high level, by electronic switch S2 conducting.In one embodiment, electronic switch S1 and S2 are NMOS (n channel metal field oxide semiconductor field effect transistor).For the normally that guarantees electronic switch S1 with close, usually between its drive circuit and source electrode, arrange one from opening capacitor.This certainly opens capacitor and is recharged when electronic switch S2 conducting, and discharges when electronic switch S1 conducting.Turn-off electronic switch S1 and conducting electronics switch S 2 after overpressure situation being detected; can reach the purpose of overvoltage protection; can make again to maintain from opening the voltage at capacitor two ends, electronic switch S1 can be worked when electric ballast is restarted, guarantee reliably restarting of electric ballast.
The circuit diagram of the 3rd execution mode that Fig. 4 is electric ballast of the present invention, wherein inverter circuit 401, control circuit 402 and current sampling circuit 405 are all identical with appropriate section in circuit shown in Fig. 2.Sample circuit 403 sample streams are crossed the electric current of inductor L, and the multiplexing sampling resistor R be connected electrically between electronic switch S2 and ground of current sampling circuit 405
sense.Comparison circuit 404 comprises comparator C OM2.The in-phase input end of comparator C OM2 receives a threshold value V
th2, inverting input is electrically connected to sampling resistor R
senseto receive sampled signal SENSE, output output overvoltage signal OV, wherein this overvoltage signal OV is Low level effective.
If there is overvoltage in the voltage at gaseous discharge lamp two ends, flow through the corresponding increase of electric current meeting at inductor L two ends, make sampled signal SENSE be greater than threshold value V
th2, overvoltage signal OV is effective, is low level.With door AND1 and the equal output low level of AND2, electronic switch S1 and S2 are turn-offed, realize overvoltage protection.Yet in great-power electronic ballast, excessive for fear of power consumption, sampling resistor R
senseresistance generally less, thereby the value of sampled signal SENSE is also less, easily is disturbed.
The circuit diagram of the 4th execution mode that Fig. 5 is electric ballast of the present invention, wherein inverter circuit 501, control circuit 502 and current sampling circuit 505 are all identical with appropriate section in circuit shown in Fig. 3.Sample circuit 503 sample streams are crossed the electric current of inductor L, comprise current transformer T1, diode D6 and resistor R1.The former limit coupled in series of current transformer T1 is to the loop at inductor L place.The half-wave rectifying circuit that diode D6 forms is connected to the secondary of current transformer T1, and the electric current of current flowing instrument transformer T1 secondary is carried out to halfwave rectifier.Resistor R1 and diode D6 are connected in series, and the current signal after halfwave rectifier is converted to sampled signal SENSE, send into comparison circuit 504.Resistor R1 also can directly be connected in parallel to the secondary of current transformer T1, and half-wave rectifying circuit carries out the voltage at resistor R1 two ends to produce sampled signal SENSE after halfwave rectifier.Comparison circuit 504 comprises comparator C OM2.The in-phase input end of comparator C OM2 receives a threshold value V
th3, inverting input is electrically connected to half-wave rectifying circuit to receive sampled signal SENSE, output output overvoltage signal OV, and wherein this overvoltage signal OV is Low level effective.
If there is overvoltage in the voltage at gaseous discharge lamp two ends, flow through the corresponding increase of electric current meeting at inductor L two ends, make sampled signal SENSE be greater than threshold value V
th3, overvoltage signal OV is effective, is low level.With door AND1 output low level, electronic switch S1 is turn-offed, realize overvoltage protection.Now, or door OR1 output high level, by electronic switch S2 conducting.
The flow chart of the ignition method that Fig. 6 is electric ballast of the present invention, comprise step 601～603.Wherein this electric ballast comprises inverter circuit and the electric coupling inductor inverter circuit and gaseous discharge lamp between of generation alternating voltage with gas discharge lamp.
In one embodiment, the electrical quantity by the monitoring inductor judges whether the voltage at gaseous discharge lamp two ends exists overvoltage to comprise: the electrical quantity of sampling inductor also produces the sampled signal that represents this electrical quantity; Sampled signal and a threshold value are compared, if wherein sampled signal is greater than described threshold value, is judged as and has overvoltage.
Although with reference to several exemplary embodiments, described the present invention, should be appreciated that term used is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (16)
1. an electric ballast comprises:
Inverter circuit, comprise at least one electronic switch, and the conducting by described at least one electronic switch produces alternating voltage with gas discharge lamp with turn-offing;
Resonant network comprises:
The first capacitor, have first end and the second end, and wherein first end is electrically coupled to described inverter circuit;
Inductor, have first end and the second end, and wherein first end is electrically coupled to the second end of described the first capacitor, and the second end is coupled to the first end of described gaseous discharge lamp; And
The second capacitor, have first end and the second end, and wherein first end is electrically coupled to the second end of described the first capacitor and the first end of described gaseous discharge lamp, and the second end is coupled to the second end of described gaseous discharge lamp;
Control circuit, be electrically coupled to described inverter circuit, controls conducting and the shutoff of described at least one electronic switch; And
Over-voltage detection circuit, be coupled to described inductor, judges by the electrical quantity of monitoring described inductor whether the voltage at described gaseous discharge lamp two ends under the lamp open-circuit condition exists overvoltage;
If wherein there is overvoltage, described control circuit cuts out described inverter circuit;
Wherein said over-voltage detection circuit comprises:
Sample circuit, be coupled to described inductor, the electrical quantity of the described inductor of sampling, and produce the sampled signal that represents this electrical quantity; And
Comparison circuit, be electrically coupled to described sample circuit, and described sampled signal and threshold value are compared;
If wherein described sampled signal is greater than described threshold value, is judged as and has overvoltage.
2. electric ballast as claimed in claim 1, the sample voltage at described inductor two ends of wherein said sample circuit.
3. electric ballast as claimed in claim 2, wherein said sample circuit comprises:
Coupling inductor, with described inductor magnetic coupling; And
Rectification circuit, be electrically coupled to described coupling inductor, the voltage at described coupling inductor two ends carried out to rectification, and produce described sampled signal.
4. electric ballast as claimed in claim 1, wherein said sample circuit sample streams is crossed the electric current of described inductor.
5. electric ballast as claimed in claim 4, wherein said sample circuit comprises that series electrical is coupled to the sampling resistor in described inductor loop (Rsense).
6. electric ballast as claimed in claim 4, wherein said sample circuit comes sample streams to cross the electric current of described inductor by current transformer.
7. electric ballast as claimed in claim 6, wherein said sample circuit comprises:
Current transformer, the former limit coupled in series of described current transformer is to the loop of described inductor;
Rectification circuit, be electrically coupled to the secondary of described current transformer, and the electric current that flows through described current transformer secondary is carried out to rectification; And
Resistor, be electrically connected to the output of described rectification circuit, and the voltage at described resistor two ends is described sampled signal.
8. electric ballast as described as any one in claim 1 to 7, wherein said inverter circuit adopts half-bridge topology, comprises the first electronic switch and the second electronic switch that are connected in series.
9. electric ballast as claimed in claim 8, wherein close described inverter circuit and comprise described the first and second electronic switches of shutoff.
10. electric ballast as claimed in claim 8, wherein close described inverter circuit and comprise described the first electronic switch of shutoff described the second electronic switch of conducting.
11. the over-voltage protection method of an electric ballast, wherein said electric ballast comprises inverter circuit and the resonant network of generation alternating voltage with gas discharge lamp, this resonant network comprises: the first capacitor, have first end and the second end, wherein first end is electrically coupled to described inverter circuit; Inductor, have first end and the second end, and wherein first end is electrically coupled to the second end of described the first capacitor, and the second end is coupled to the first end of described gaseous discharge lamp; And second capacitor, there is first end and the second end, wherein first end is electrically coupled to the second end of described the first capacitor and the first end of described gaseous discharge lamp, and the second end is coupled to the second end of described gaseous discharge lamp, and the method comprises:
Monitor the electrical quantity of described inductor;
Whether the voltage that judges described gaseous discharge lamp two ends based on monitoring result exists overvoltage; And
If there is overvoltage, close described inverter circuit;
Wherein by the electrical quantity of monitoring described inductor, judge whether the voltage at described gaseous discharge lamp two ends under the lamp open-circuit condition exists overvoltage to comprise:
Sample described inductor electrical quantity and produce the sampled signal of this electrical quantity; And
Described sampled signal and threshold value are compared;
If wherein described sampled signal is greater than described threshold value, is judged as and has overvoltage.
12. over-voltage protection method as claimed in claim 11, the voltage that the electrical quantity of wherein said inductor is described inductor two ends.
13. over-voltage protection method as claimed in claim 11, the electrical quantity of wherein said inductor is the electric current that flows through described inductor.
14. over-voltage protection method as described as any one in claim 11 to 13, wherein said inverter circuit adopts half-bridge topology, comprises the first electronic switch and the second electronic switch that are connected in series.
15. over-voltage protection method as claimed in claim 14, wherein close described inverter circuit and comprise described the first and second electronic switches of shutoff.
16. over-voltage protection method as claimed in claim 14, wherein close described inverter circuit and comprise described the first electronic switch of shutoff described the second electronic switch of conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101921123A CN101868105B (en) | 2010-05-28 | 2010-05-28 | Electronic ballast and overvoltage protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101921123A CN101868105B (en) | 2010-05-28 | 2010-05-28 | Electronic ballast and overvoltage protection method thereof |
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| CN101868105A CN101868105A (en) | 2010-10-20 |
| CN101868105B true CN101868105B (en) | 2013-12-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170289B (en) * | 2011-05-28 | 2013-03-20 | 西安电子科技大学 | Low-power-consumption orthogonal LC (inductance/capacitance) voltage controlled oscillator based on current multiplex |
| CN102435820B (en) * | 2011-11-30 | 2013-08-07 | 中国科学院微电子研究所 | Overvoltage detection circuit |
| CN103957652B (en) * | 2014-03-31 | 2016-06-29 | 浙江七星青和电子科技有限公司 | A kind of voltage monitoring circuit of DC ballast |
| US9793790B2 (en) * | 2015-11-24 | 2017-10-17 | Infineon Technologies Austria Ag | Adaptive open-load overvoltage control method and circuit |
| CN107613626B (en) * | 2017-10-25 | 2021-01-26 | 苏州纽克斯电源技术股份有限公司 | Output detection protection circuit and alternating current electronic ballast for HID lamp |
| CN108233329B (en) * | 2018-03-16 | 2024-05-31 | 西安赛诺克新能源科技有限公司 | Protection circuit for improving main circuit disconnection response speed |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103229U (en) * | 1991-07-02 | 1992-04-29 | 陆茂法 | Low-tension sodium lamp electronic ballast |
| CN1543755A (en) * | 2001-06-22 | 2004-11-03 | �¬ | Electronic ballast |
| CN101553071A (en) * | 2008-04-01 | 2009-10-07 | 台达电子工业股份有限公司 | Discharge lamp system and control method thereof |
| WO2010027389A2 (en) * | 2008-09-05 | 2010-03-11 | Lutron Electronics Co., Inc. | Electronic ballast having a partially self-oscillating inverter circuit |
-
2010
- 2010-05-28 CN CN2010101921123A patent/CN101868105B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103229U (en) * | 1991-07-02 | 1992-04-29 | 陆茂法 | Low-tension sodium lamp electronic ballast |
| CN1543755A (en) * | 2001-06-22 | 2004-11-03 | �¬ | Electronic ballast |
| CN101553071A (en) * | 2008-04-01 | 2009-10-07 | 台达电子工业股份有限公司 | Discharge lamp system and control method thereof |
| WO2010027389A2 (en) * | 2008-09-05 | 2010-03-11 | Lutron Electronics Co., Inc. | Electronic ballast having a partially self-oscillating inverter circuit |
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| CN101868105A (en) | 2010-10-20 |
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