CN2177327Y - Automatically protecting electronic ballast - Google Patents
Automatically protecting electronic ballast Download PDFInfo
- Publication number
- CN2177327Y CN2177327Y CN 93245408 CN93245408U CN2177327Y CN 2177327 Y CN2177327 Y CN 2177327Y CN 93245408 CN93245408 CN 93245408 CN 93245408 U CN93245408 U CN 93245408U CN 2177327 Y CN2177327 Y CN 2177327Y
- Authority
- CN
- China
- Prior art keywords
- triodes
- triode
- magnet ring
- magnetic loop
- electronic ballast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Discharge Lamps And Accessories Thereof (AREA)
Abstract
The utility model relates to an automatic protective type electronic ballast. A magnetic loop is clamped between two triodes of an oscillatory circuit of the automatic protective type electronic ballast, and the magnetic loop is mutually approached to the two triodes. Primary coils of the magnetic loop are connected in series with the oscillatory circuit. One end of the magnetic loop is respectively connected with an emitter and a collector of the two triodes. The two secondary coils respectively control the base current of the two triodes. When a lamp tube ages or leaks air slightly, the electric current variation of the primary coils and the heat generation of the triodes can cause the magnetic induction of the magnetic loop to vary. The secondary coils can limit or cut the base current of the triodes, and electric current can be automatically adjusted according to the performance state of the lamp tube.
Description
The utility model relates to and the electric ballast of fluorescent lamp.
Many electric ballasts do not possess the abnormal condition protection function, as lamp tube air leaking, aging or when rectifying effect is arranged, promptly produce big electric current or high temperature and damage.Some electric ballast that is provided with defencive function adopts relay and some to come the control circuit operating state with sensers that temperature controlling resistance rate changes, and realizes circuit protection.
The purpose of the utility model is to provide a kind ofly with the temperature-control material permeance, promptly controls magnetic flux density and changes, and realizes the electric ballast of protection automatically.
Described automatic protection electric ballast, the oscillating circuit of being made up of rectification circuit, circuits for triggering and triode T1, T2 constitutes.On the arrangements of elements of circuit board, accompany a magnet ring between triode T1 and the T2, triode and magnet ring are pressed close to, primary electrical circle L2C on the magnet ring is serially connected with in the oscillating circuit and the end of primary electrical circle L2c connects the collector electrode and the emitter that is connected T1 by resistance of triode T2, the base stage that secondary coil L2a on the magnet ring and the two ends of L2b are connected to triode T1 and T2 be connected emitter by resistance.
Described electric ballast, two triode clamping magnet rings of oscillating circuit, and the base current of the secondary coil of magnet ring control triode, magnet ring can be experienced the temperature of triode simultaneously.When fluorescent tube leaks air, during aging or rectifying effect, the magnet ring primary current that is serially connected with in the oscillating circuit strengthens, the base current that secondary coil is responded to triode increases, the induced electromotive force of the inductance in the oscillating circuit is increased, and inverse electromotive force is added to the collector electrode of T1 and T2 in turn, to making the heating of loss surge triode.The triode of two heatings conducts heat to magnet ring.Before magnet ring was near the Curie point temperature, its magnetic flux density weakened rapidly, and the induced current of secondary coil is reduced significantly, and the reduction of transistor base electric current has promptly limited operating current.Reach Curie point as the magnet ring temperature, magnet ring becomes paramagnetism, the non-inductive substantially electric current of secondary coil, and triode ends and quits work.Described ballast need not debugging, and adaptability is very strong, and it cooperates the fluorescent lamp of various different performance quality, or during the fluorescent tube of aging, gas leakage, all can regulate electric current automatically according to the performance state of fluorescent lamp, protects unlikely burning out automatically.
Fig. 1, the installation site figure of triode and magnet ring.
Fig. 2, the circuit diagram of described ballast.
Form rectification circuit by transformer L1, diode D1-D4, the circuits for triggering that its output is formed by resistance R 1, switch triode D7, capacitor C 3, the base stage of connection triode T2.The emitter of triode T1 is connected with the current collection collection of T2 by resistance R 2, primary coil L2c on the magnet ring is serially connected with inductance L 3, in the oscillating circuit that capacitor C 7, C6 and triode are formed, the same inscription end of L2c links to each other with the different inscription end of secondary coil L2a, and be connected with the emitter of T1, the collector electrode of T2, the base stage of the same inscription termination T1 of L2a, the base stage of the different inscription termination T2 of secondary coil L2b is with the emitter of inscription termination T2.When fluorescent tube leaks gas, wears out, be equivalent to C6, C7 polyphone this moment, the resonance frequency liter doubles above, and it is big that the saturation current of magnet ring instrument transformer becomes, the base current of its induction also increases, collector current rises, and the induced electromotive force of inductance L 3 increases, and its inverse electromotive force is added to the collector electrode of T1 and T2 in turn, cause the pipe consumption to increase, temperature raises, and magnet ring is heated, thereby magnetic flux density changes restriction or ends operating current.
Claims (1)
1, automatic protection electric ballast, the oscillating circuit of being made up of rectification circuit, circuits for triggering and triode T1, T2 constitutes, and it is characterized in that:
(1) on circuit board, accompany a magnet ring between triode T1 and the T2, triode and magnet ring are pressed close to;
(2) the primary electrical circle L2c on the magnet ring is serially connected with in the oscillating circuit, and the end of L2c connects the collector electrode and the emitter that is connected T1 by resistance of triode T2, the base stage that secondary coil L2a on the magnet ring and the two ends of L2b are connected to triode T1 and T2 be connected emitter by resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93245408 CN2177327Y (en) | 1993-12-01 | 1993-12-01 | Automatically protecting electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93245408 CN2177327Y (en) | 1993-12-01 | 1993-12-01 | Automatically protecting electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2177327Y true CN2177327Y (en) | 1994-09-14 |
Family
ID=33818360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93245408 Expired - Fee Related CN2177327Y (en) | 1993-12-01 | 1993-12-01 | Automatically protecting electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2177327Y (en) |
-
1993
- 1993-12-01 CN CN 93245408 patent/CN2177327Y/en not_active Expired - Fee Related
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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 |