Fault protection circuit for electronic balast of fluorescent lamp

Abstract

The protective circuit of oscillation stopping for electronic stabilizer in fluorescent lamp consists of several resonant capacitors, a sampling transformer, a processing circuit of protective signaland a oscillation-stopping circuit as the sampling transformer will separately sample of a normal sampling signal and a fault sampling signal which they two are made into a great deal of difference when lamp tube is in normal and in fault, the protective signal processing circuit will sent out a fault signal when it receives the fault sampling signal and the oscillation-stopping circuit will sendout a oscillation-stopping signal to inverter to make it stop working when the oscillation-stopping circuit receives the fault signal.

Description

technical field [0001] The invention relates to an electronic ballast of a fluorescent lamp, and in particular to a vibration stop protection circuit of the electronic ballast of a fluorescent lamp. Background technique [0002] Lighting equipment is already a part of people's lives, so the requirements for lighting equipment are getting higher and higher, such as reducing the flicker of the lamp tube, increasing the life of the lamp tube, improving the luminous efficiency of the lamp tube, and so on. In order to meet the above requirements, the electronic ballast (Electronic Ballast) was born. [0003] The electronic ballast can be used to drive single-tube fluorescent lamps or multi-tube fluorescent lamps. When the electronic ballast is used to drive multi-tube fluorescent lamps, the failure of some tubes must be considered. When multi-tube fluorescent lamps are working normally, the working characteristics of each lamp tube are relatively consistent, that is, the load is...

AI Technical Summary

Problems solved by technology

[0004] When the electronic ballast is working, when the lamp tube fails, the protection circuit of the general electronic ballast is to sample the current of the power circuit or the voltage on the lamp tube, and the protection circuit uses the current or voltage sampled during normal operation and failure. If the electronic ballast is used to drive multi-tube fluorescent lamps and only some of the lamps fail, the difference between the sampling signal at normal time and the sampling signal when some of the lamps are faulty is not large. If the lamps work at Under different circumstances, such as low voltage or low temperature, the sampling signal at normal time will cross the range of sampling signal when some lamp tubes are faulty, which makes it impossible to select the appropriate protection action threshold of the protection circuit

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