CN2692960Y - Self-follow current deep-protection fluorescent lamp electronic ballast - Google Patents
Self-follow current deep-protection fluorescent lamp electronic ballast Download PDFInfo
- Publication number
- CN2692960Y CN2692960Y CN 200420021478 CN200420021478U CN2692960Y CN 2692960 Y CN2692960 Y CN 2692960Y CN 200420021478 CN200420021478 CN 200420021478 CN 200420021478 U CN200420021478 U CN 200420021478U CN 2692960 Y CN2692960 Y CN 2692960Y
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- triode
- protection
- resistance
- electronic ballast
- follow current
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Abstract
The utility model provides a self-follow current deep-protection electronic ballast for fluorescent lamps. When a failure occurs, a trigger tube DB3 is broken down and a thyristor V3 is conducted to switch off a triode V1 and to realize protection. Because the triode V1 exists in high potential and the electrical potential of a c pole is much higher than a b pole, the triode V1 is thoroughly switched off; because a resistor R10 provides follow current to ensure the thyristor V3 conducted continuously at the same time, the protection can be sustained. The protection of the utility model is the combination of the triode and the follow current and the circuit is more simple; when the failure occurs, the protection circuit switches off the triode which exists in high potential at the same time, so the protection is more reliable.
Description
Technical field
The utility model relates to a kind of electronic ballast for fluoresent lamp.
Background technology
Along with the idea of green illumination is more and more accepted by consumers in general, the use of electronic ballast for fluoresent lamp also more and more widely.In use, we find through regular meeting, and fluorescent lamp tube leaks air, short circuit appears in filament blow or circuit or when opening circuit, and are very many owing to ballast does not carry out the phenomenon that self-protection damages in time.For these anomalies, on the safety standard and performance standard of China, clear and definite regulation is arranged all about the cast electronic ballast for fluoresent lamp, electric ballast must self-protection.
Normally used protection circuit mainly is as shown in Figure 1 on the electronic ballast for fluoresent lamp now: when operate as normal; on the auxiliary winding of choke L3, can produce the voltage of a feedback; this voltage generally can not surpass the trigger voltage of trigger tube DB3 after diode D9 rectification, electrochemical capacitor C15 filtering, resistance R 11, R12 dividing potential drop.When anomaly occurring; feedback voltage will make trigger tube DB3 conducting above trigger voltage, and for the control utmost point of controllable silicon V3 provides a cut-in voltage, the conducting of controllable silicon V3 will make triode V4 conducting; thereby triode V2 is quit work, reach the purpose of protection.Simultaneously, because by resistance R 1, R2, R3, the afterflow effect of controllable silicon V3, protective circuit realizes self-locking.
The major advantage of this protective circuit is that protection is rapid, reliable.But its circuit institute palpus element is more, and reliability of products is reduced, and has increased cost.Simultaneously because the pressure drop of triode V4 itself, make triode V2 still have faint electrical potential difference between over the ground, make turn-off be difficult to thorough.
Summary of the invention
Technical problem to be solved in the utility model provides a kind ofly can turn-off electric ballast completely when breaking down.
In order to solve the problems of the technologies described above; the utility model has adopted following technical proposals: provide a kind of and protect electronic ballast for fluoresent lamp deeply from afterflow; comprise protective circuit; this protective circuit comprises resistance R 9; R10; R14; R16; R17; R18; diode D9; D10; electrochemical capacitor C15; controllable silicon V3; trigger tube DB3; wherein; trigger tube DB3 one end links with diode D10 by resistance R 17; the other end is connected with controllable silicon V3; the other end of described controllable silicon V3 is connected in the collector electrode of triode V1 by resistance R 10; the base stage of described triode V1 is by resistance R 9; diode D9 is connected in controllable silicon V3, and the emitter of described triode V1 is connected in the collector electrode of triode V2 by resistance R 5.
The protective circuit of the utility model electric ballast will protect the triode of usefulness and controllable silicon that afterflow is used to merge, and make circuit simpler.Simultaneously, when breaking down, what protective circuit was closed is the triode that is in high potential, makes protection darker more reliable.
Description of drawings
Fig. 1 is existing circuit of fluorescent lamp electronic ballast schematic diagram.
Fig. 2 is a circuit of fluorescent lamp electronic ballast schematic diagram of the present utility model.
Embodiment
As shown in Figure 2, the protective circuit of electric ballast of the present utility model mainly comprises resistance R 9, R10, R14, R16, R17, R18, diode D9, D10, and electrochemical capacitor C15, controllable silicon V3 and trigger tube DB3 form.
Wherein, trigger tube DB3 one end links by R17 and diode D10, the other end is connected with controllable silicon V3, the other end of described controllable silicon V3 is connected in the collector electrode of triode V1 by resistance R 10, the base stage of described triode V1 is connected in controllable silicon V3 by resistance R 9, diode D9, and the emitter of described triode V1 is connected in the collector electrode of triode V2 by resistance R 5.
When the ballast operate as normal, the auxiliary winding of choke L3 will produce a feedback signal, become galvanic current on capacitor C 15 and press after resistance R 14 and resistance R 16 shuntings, diode D10 rectification.When breaking down, this voltage will increase rapidly, and trigger tube DB3 is punctured, so triode V1 is turn-offed in controllable silicon V3 conducting, realizes protection.Because triode V1 is in high potential, therefore its c electrode potential will turn-off very thorough far above the b utmost point.Simultaneously, because the freewheel current that resistance R 10 provides is continued the conducting of controllable silicon V3, protection can be kept.
Claims (1)
1; a kind ofly protect electronic ballast for fluoresent lamp deeply from afterflow; comprise protective circuit; it is characterized in that; this protective circuit comprises resistance (R9; R10; R14; R16; R17; R18); diode (D9; D10); electrochemical capacitor (C15); controllable silicon (V3); trigger tube (DB3); wherein; trigger tube (DB3) end links by resistance (R17) and diode (D10); the other end is connected with controllable silicon (V3); the other end of described controllable silicon (V3) is connected in the collector electrode of triode (V1) by resistance (R10); the base stage of described triode (V1) is by resistance (R9); diode (D9) is connected in controllable silicon (V3), and the emitter of described triode (V1) is connected in the collector electrode of triode (V2) by resistance (R5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420021478 CN2692960Y (en) | 2004-03-31 | 2004-03-31 | Self-follow current deep-protection fluorescent lamp electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420021478 CN2692960Y (en) | 2004-03-31 | 2004-03-31 | Self-follow current deep-protection fluorescent lamp electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2692960Y true CN2692960Y (en) | 2005-04-13 |
Family
ID=34769975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420021478 Expired - Lifetime CN2692960Y (en) | 2004-03-31 | 2004-03-31 | Self-follow current deep-protection fluorescent lamp electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2692960Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163068A (en) * | 2015-04-28 | 2016-11-23 | 李少华 | Electronic ballast for fluoresent lamp protection circuit |
-
2004
- 2004-03-31 CN CN 200420021478 patent/CN2692960Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163068A (en) * | 2015-04-28 | 2016-11-23 | 李少华 | Electronic ballast for fluoresent lamp protection circuit |
| CN106163068B (en) * | 2015-04-28 | 2018-09-07 | 李少华 | Electronic ballast for fluoresent lamp protects circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140331 Granted publication date: 20050413 |
|
| DD01 | Delivery of document by public notice |
Addressee: Zhang Zhixian Document name: Notification of Expiration of Patent Right Duration |