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一、保护电路基础知识彩色电视机中的电源电路、行输出电路、伴音功放电路、场输出电路等,工作于高电压或大电流状态,故障率较高,且上述电路的损坏,往往波及其他电路连锁损坏。为了避免故障扩大,在彩色电视机中,多设有保护电路,对上述高电压、大电流电路的工作状态进行监测,当被监测电路发生过压、过流等现象时,采取保护措施。彩电中的保护电路结构大多由故障检测电路、电压翻转电路、保护执行电路三部分构成。故障检测电路对被检测的电压或电流进行检测,并将检测结果送到
First, the basic knowledge of the protection circuit Color TV in the power circuit, line output circuit, sound amplifier circuit, field output circuit, working in high voltage or high current state, the failure rate is high, and the circuit damage, often spread to other Circuit chain damage. In order to avoid the trouble to expand, in the color television set, there are many protection circuits, monitor the working state of the high-voltage, high-current circuit, when the monitored circuit overvoltage, overcurrent and other phenomena, to take protective measures. Most of the color TV protection circuit structure consists of fault detection circuit, voltage flip circuit, the protection of the implementation of the circuit is composed of three parts. Fault detection circuit to be detected voltage or current detection, and the test results to