CN2127813Y - Electronic ballast with superheat protection circuit for fluorescent lamps - Google Patents
Electronic ballast with superheat protection circuit for fluorescent lamps Download PDFInfo
- Publication number
- CN2127813Y CN2127813Y CN 92217442 CN92217442U CN2127813Y CN 2127813 Y CN2127813 Y CN 2127813Y CN 92217442 CN92217442 CN 92217442 CN 92217442 U CN92217442 U CN 92217442U CN 2127813 Y CN2127813 Y CN 2127813Y
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- China
- Prior art keywords
- protection circuit
- electronic ballast
- resistor
- transistor
- utility
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Abstract
Disclosed is an electronic ballast with superheat protection circuit for fluorescent lamps. The superheat protection circuit comprises a resistor (1), a controlled silicon (2), an LED (3), an electric relay (4), a resistor (11), a zener diode (10), a resistor (8), a controlled silicon (7), a diode (9), a coil (6), transistors (12), (13) and a current limiting inductor (5). Compared with general pulse sampling, the utility model adopts heat sampling and is free from the influence of high voltage pulse during normal starting, and the protection circuit has the function of current limiting and protecting. Because the protection circuit has no phenomenon of starting interruption or lamp tube flickering after operating and has conspicuous protection indication, the reliability of the electronic ballast is improved. The utility model has the advantages of long service life, less power consumption and few elements.
Description
The utility model belongs to a kind of electronic ballast for fluoresent lamp with overheating protection circuit.
Fluorescent tube can be aging gradually after using the long period, and electric ballast the lamp tube ends current potential usually can occur and raise when lighting this aging fluorescent tube, and the output current of transistor is increased.When the collector electrode power consumption of transistor was loose power above maximum consumption number, transistor will damage because of junction temperature is too high.Electric ballast is aging and ineffective along with fluorescent tube often also.The electronic ballast for fluoresent lamp that has protective device at present all has following deficiency: protective device is taken a sample in oscillating impulse, is easy to generate misoperation when the electric ballast starter; Owing to take a sample in oscillating impulse, usually be failure of oscillation, starter, failure of oscillation again, starter again, so continuous starter causes fluorescent tube and electric ballast further to damage, and makes human eye perceives uncomfortable; There is not obvious indication during protective circuit work yet.
The purpose of this utility model is above-mentioned deficiency with electric ballast of protective device is improved; a kind of electronic ballast for fluoresent lamp with overheating protection circuit is provided, thereby further improves the useful life of the reliability and the prolonging lamp tube of electric ballast.
Design of the present utility model is: along with wearing out of fluorescent tube, changed the condition of resonance of circuit inductance electric capacity, the voltage of lamp tube ends rises, and the electric capacity capacitive reactance that is parallel to lamp tube ends reduces, the electric current that flows through tube filament further rises, and the transistor output current increases.The current-limiting inductor that is parallel to the electric capacity two ends in the utility model can make the output current of transistor and the electric current that flows through tube filament reduce, thereby has prolonged the useful life of fluorescent tube and improved the reliability of transistor work.
The utility model is described in further detail below in conjunction with embodiment.Fig. 1 is the circuit diagram with electronic ballast for fluoresent lamp of overheating protection circuit.Wherein the circuit in the frame of broken lines is an overheating protection circuit of the present utility model, and the circuit beyond the frame of broken lines is the circuit of general electronic ballast for fluoresent lamp.Be parallel to the current-limiting inductor ［ 5 ］ at electric capacity ［ 14 ］ two ends, when fluorescent tube is aging gradually, the output current of the electric current that flows through tube filament and transistor ［ 12 ］, ［ 13 ］ reduced.And when abnormal conditions appearred in electric ballast, overheating protection circuit can further play a protective role.Thermistor ［ 7 ］ is close on the element that transistor ［ 12 ］ or ［ 13 ］ or other can be overheated, and thermistor ［ 7 ］ is to the superheat state sampling of transistor ［ 12 ］ or ［ 13 ］.When the electric ballast starter, though the normal electric current of electric current of transistor ［ 12 ］, ［ 13 ］ output is big, because of the time weak point, fluorescent tube Guan Wen can obviously not rise, the resistance no change of thermistor ［ 7 ］, controllable silicon ［ 2 ］ can not be triggered, and relay ［ 4 ］ can not move.Only (the warning temperature design of this circuit is 60 ℃ when the transistor temperature rises to the warning temperature, can pass through the resistance size of resistance ［ 8 ］ and thermistor ［ 7 ］ harmonizes), the resistance of thermistor ［ 7 ］ rises, controllable silicon ［ 2 ］ is triggered and conducting, light-emitting diode ［ 3 ］ shows immediately and (shows that fluorescent tube that electric ballast connects must be changed or there is fault in ballast itself, must get rid of), relay ［ 4 ］ action, be connected in coil ［ 6 ］ on the magnet ring by short circuit, transistor ［ 12 ］, ［ 13 ］ oscillating circuit failure of oscillation.After the failure of oscillation, Guan Wen gradually falls, and thermistor ［ 7 ］ resistance reduces, and the trigger voltage of controllable silicon ［ 2 ］ descends.Because the SCR control branch road is to be connected between the both positive and negative polarity of power circuit, though the transistor failure of oscillation, power circuit does not open circuit, and controllable silicon ［ 2 ］ is kept electric current H because of what flow through
HFor 2-30mA continues conducting, the normal still closure of making war of relay ［ 4 ］ forces transistor ［ 12 ］, ［ 13 ］ circuit to continue failure of oscillation.Have only when restarting when cutting off the electricity supply, overheating protection circuit just can reappear said process.
The utility model has the advantages that: (1) overtemperature protection electric current is current limliting but also protect not only; (2) overheating protection circuit is taken a sample in transistor Guan Wen, the impact of high-voltage pulse when not being subjected to normal starter; (3) after the overheating protection circuit work, obvious protection indication is arranged, and do not have interrupted starter and fluorescent tube scintillation.
Claims (4)
1, a kind of electronic ballast for fluoresent lamp with overheating protection circuit is characterized in that overheating protection circuit is made up of resistance [1], controllable silicon [2], light-emitting diode [3], relay [4], resistance [11], voltage stabilizing didoe [10], resistance [8], thermistor [7], diode [9], coil [6], transistor [12] and [13], current-limiting inductor [5].
2, electric ballast according to claim 1 is characterized in that thermistor ［ 7 ］ is close on the element that transistor ［ 12 ］ or ［ 13 ］ or other can be overheated.
3, electric ballast according to claim 1 is characterized in that the electric current I of keeping of controllable silicon ［ 2 ］
HBe 2-30mA.
4, electric ballast according to claim 1 is characterized in that current-limiting inductor ［ 5 ］ is connected in parallel on the electric capacity ［ 14 ］.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92217442 CN2127813Y (en) | 1992-07-24 | 1992-07-24 | Electronic ballast with superheat protection circuit for fluorescent lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92217442 CN2127813Y (en) | 1992-07-24 | 1992-07-24 | Electronic ballast with superheat protection circuit for fluorescent lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2127813Y true CN2127813Y (en) | 1993-03-03 |
Family
ID=33765257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92217442 Expired - Fee Related CN2127813Y (en) | 1992-07-24 | 1992-07-24 | Electronic ballast with superheat protection circuit for fluorescent lamps |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2127813Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796889B (en) * | 2007-08-27 | 2015-01-28 | 通用电气公司 | Thermal foldback for linear fluorescent lamp ballasts |
| CN111542151A (en) * | 2020-06-17 | 2020-08-14 | 东莞职业技术学院 | Lamp control circuit and lamp thereof |
-
1992
- 1992-07-24 CN CN 92217442 patent/CN2127813Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796889B (en) * | 2007-08-27 | 2015-01-28 | 通用电气公司 | Thermal foldback for linear fluorescent lamp ballasts |
| CN111542151A (en) * | 2020-06-17 | 2020-08-14 | 东莞职业技术学院 | Lamp control circuit and lamp thereof |
| CN111542151B (en) * | 2020-06-17 | 2022-04-19 | 东莞职业技术学院 | Lamp control circuit and lamp thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |