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保护电路引发的故障主要分为二类:一类是被检测电路发生故障,如:被检测的行、场扫描电路发生短路、漏电、电压升高或显像管束电流过大等。故障检测电路将检测结果送到保护执行电路,保护执行电路迫使保护被控电路进入保护状态;另一类是故障检测或保护执行电路发生短路、漏电、元件变质故障(如:检测取样电阻、分压电阻变质,检测稳压二极管稳压值改变,三级管、二极管漏电等),保护执行电路引起被保护电路误入保护状态。
Faults caused by the protection circuit are mainly divided into two categories: one is the detected circuit failure, such as: the detected line, field scanning circuit short circuit, leakage, voltage or CRT tube current is too large. The fault detection circuit sends the test result to the protection execution circuit, and the protection execution circuit forcibly protects the controlled circuit from entering the protection state. The other kind is the fault detection or protection execution circuit which is in short circuit, leakage current, component deterioration fault (such as detecting sampling resistance, Piezoresistive deterioration, detection of Zener voltage regulator value changes, three tubes, diode leakage, etc.), the protection of the implementation of the circuit caused by the protection of the circuit into the protected state.