CN2117696U - Electronic ballast for fluoescent light - Google Patents
Electronic ballast for fluoescent light Download PDFInfo
- Publication number
- CN2117696U CN2117696U CN 92210512 CN92210512U CN2117696U CN 2117696 U CN2117696 U CN 2117696U CN 92210512 CN92210512 CN 92210512 CN 92210512 U CN92210512 U CN 92210512U CN 2117696 U CN2117696 U CN 2117696U
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- CN
- China
- Prior art keywords
- circuit
- electronic ballast
- fluorescent
- high frequency
- utility
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Abstract
The utility model relates to an electronic ballast for fluorescent lights. In the utility model, the middle of the basal plate and the emission pole of two transistors of a switching circuit is respectively connected with a protective diode, one end of the high-frequency induction coil of a series resonance circuit is connected with the other end of the lamp filament of a fluorescent light to connect with the middle point of a voltage division filtering circuit which is arranged at the output end of rectifier bridge, and the voltage division filtering circuit is composed of a voltage division resistor and a filtering capacitor. The electronic ballast for fluorescent lights can raise the service life of a fluorescent light which matches with the electronic ballast for fluorescent lights by one time; compared with an inductive ballast circuit, the power conversation of the fluorescent light circuit can be 30%; the utility model can be normally used when the voltage is 160 to 250V, the temperature rise of the electronic ballast for fluorescent lights is less than 30 DEG, and the alternative frequency of the high frequency strong electric field of the light tube can be up to 50 times per second.
Description
The utility model provides a kind of electronic ballast for fluorescent lamps, by filter, bridge rectifier, filter circuit, saw-toothed wave generator, and by high frequency transistor, primary coil is connected to two high frequency transistor bases respectively---the switching circuit of the pulse transformer composition of emitter circuit, one end is connected to collector electrode---the emitter that two high frequency transistors are connected, and the other end is connected to the R of DC circuit anode, the C output phase is proofreaied and correct net, be connected to the high-frequency inductor coil of pulse transformer secondary loop, the series resonant circuit that peripheral hardware electric capacity is formed between fluorescent lamp two filaments connect in turn constitute.Belong to the electric lighting technology.
The electronic ballast for fluorescent lamps is compared with inductance type ballast can economize on electricity 30%, and fluorescent tube can improve nearly one times useful life.Therefore, some industrially developed country have prohibited and have produced and used inductance type ballast., the electric ballast that sell the domestic market is because circuit is formed the mains supply characteristics that are difficult to adapt to China's wide geographic area, deficiency such as occur that reliability is low, temperature rise, economize on electricity are not fairly obvious.
At the above-mentioned deficiency of existing electric ballast, the purpose of this utility model provides a kind of can work safely and reliably in the voltage range of broad, and temperature rise is low, the electronic ballast for fluoresent lamp that the circuit for fluorescent lamp whole efficiency is high.
Above-mentioned purpose of the present utility model realizes by taking following technical measures.
In switching circuit, be connected to a protection diode between two transistorized substrates separately and the emitter respectively; High-frequency inductor coil one in the series resonant circuit is terminated at filament, and dividing potential drop, the filter circuit mid point be made up of divider resistance, filter capacitor of the other end and rectification bridge output end join.
Adopt technical scheme provided by the utility model, can avoid because LC is a series resonance a---detuned circuit, its residual induction or electric capacity make the waveform of resonance after-current asynchronous with fundamental frequency voltage waveform phase place, thereby influence the efficient and the disadvantage that jeopardizes transistorized safe handling of output loop.Promptly, make transistor collector current iC because of the output loop off resonance
1, iC
2When together negative value occurring, in each high frequency period, negative current flows through from diode, and stray capacitance just can not produce big peaking voltage in the circuit, has improved the job stability of electric ballast.
The operating frequency of heater chain is mainly determined by LC series resonance numerical value.The inductance value of levelling high-frequency inductor coil then can obtain the corresponding work electric current.
This electric ballast, because good operating stability can improve one times of matching used fluorescent tube life-span, circuit for fluorescent lamp economizes on electricity 30% than use inductance type ballast circuit, and can normally use in the 160-250V voltage range, and the temperature rise of ballast own is no more than 30 ℃.The alternative frequency of high frequency highfield reaches per second 50K time in the fluorescent tube.
Accompanying drawing 1 is and the circuit theory diagrams of a matching used electric ballast of fluorescent lamp that accompanying drawing 2 is two lamp driver electrical schematic diagrams.Below in conjunction with accompanying drawing, further describe technical characterictic of the present utility model by most preferred embodiment.
Electric ballast is made of several partial circuits.Comprise the rectifier bridge of forming by rectifier diode BD, be connected to rectification bridge output end by divider resistance R
1, R
2, filter capacitor C
1, C
2The dividing potential drop of forming, filter circuit is connected to DC circuit two ends after the rectification, an output and a high-frequency tube base stage join by resistance R
3, capacitor C
3, the startup saw-toothed wave generator that bidirectional diode DH forms, and by two high frequency transistor BG
1, BG
2, primary coil n
1, n
2Be connected to two high frequency transistor bases respectively---the pulse transformer L of emitter circuit
1The switching circuit of forming, an end is connected to collector electrode---the emitter that two high frequency transistors are connected, the other end be connected to the DC circuit anode by R
4, C
4The output phase of forming is proofreaied and correct net, by being connected to pulse transformer L
1Secondary n
3The high-frequency inductor coil L in loop
2, add capacitor C between fluorescent lamp two filaments
5The series resonant circuit of forming.
Wherein, the power input of rectifier bridge is provided with filter capacitor C
6, two transistor BG in the switching circuit
1, BG
2Base stage separately and emitter between be connected to a protection diode D respectively
2, D
3, pulse transformer L
1In, n
1And n
3Homophase, n
1And n
2Anti-phase.Diode D
4, D
5Be connected to the filament two ends respectively, D
1Output phase correction net and saw-toothed wave generator capacitance-resistance link are joined.
In the present embodiment, if make electric ballast and the supporting use of 40W fluorescent tube, then L
2Be 2.0mH, C
5Be 0.01 μ F/630V, D
2, D
3Be 1N4148, R
1=R
2=220K Ω.
Technical scheme disclosed in the utility model also is suitable for the double fluorescent lamp circuit, as shown in Figure 2.
Claims (1)
1, a kind of electronic ballast for fluorescent lamps, by filter, bridge rectifier, filter circuit, saw-toothed wave generator, and by high frequency transistor, primary coil is connected to the switching circuit of the pulse transformer composition of two high frequency transistor base-emitter circuits respectively, one end is connected to collector electrode-emitter that two high frequency transistors are connected, the other end is connected to the R of DC circuit anode, the C output phase is proofreaied and correct net, be connected to the high-frequency inductor coil of pulse transformer secondary loop, the series resonant circuit that peripheral hardware electric capacity is formed between fluorescent lamp two filaments connects institute in turn and constitutes, and it is characterized by in switching circuit to be connected to one respectively between two transistorized substrates separately and the emitter and to protect diode; High-frequency inductor coil one in the series resonant circuit is terminated at filament, and dividing potential drop, the filter circuit mid point be made up of divider resistance, filter capacitor of the other end and rectification bridge output end join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92210512 CN2117696U (en) | 1992-03-28 | 1992-03-28 | Electronic ballast for fluoescent light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92210512 CN2117696U (en) | 1992-03-28 | 1992-03-28 | Electronic ballast for fluoescent light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2117696U true CN2117696U (en) | 1992-09-30 |
Family
ID=4955626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92210512 Granted CN2117696U (en) | 1992-03-28 | 1992-03-28 | Electronic ballast for fluoescent light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2117696U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050494C (en) * | 1993-03-25 | 2000-03-15 | 华中理工大学 | Electronic ballast of fluorescent light |
| CN1066005C (en) * | 1992-11-26 | 2001-05-16 | 皇家菲利浦电子有限公司 | Circuit arrangement |
| CN104935186A (en) * | 2014-03-17 | 2015-09-23 | 广东美的暖通设备有限公司 | Three-phase rectification circuit and air conditioner therewith |
-
1992
- 1992-03-28 CN CN 92210512 patent/CN2117696U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066005C (en) * | 1992-11-26 | 2001-05-16 | 皇家菲利浦电子有限公司 | Circuit arrangement |
| CN1050494C (en) * | 1993-03-25 | 2000-03-15 | 华中理工大学 | Electronic ballast of fluorescent light |
| CN104935186A (en) * | 2014-03-17 | 2015-09-23 | 广东美的暖通设备有限公司 | Three-phase rectification circuit and air conditioner therewith |
| CN104935186B (en) * | 2014-03-17 | 2018-01-02 | 广东美的暖通设备有限公司 | Rectified three-phase circuit and there is its air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |