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③另外,当行输出提供的5V电压丢失时,稳压二极管D563正极电压为0V,加到D563两端的电压超过其稳压值,D563被击穿导通,Q807获正向偏置电压而导通,导通后的集电极电压通过隔离电阻R832向保护执行电路送入触发电压,也会进入待机保护状态。(7)场输出过流保护电路由过流取样电阻R578、检测放大管Q557组成。当场输出电路发生短路漏电故障,而场输出电流增
③ In addition, when the 5V output voltage provided by the output line is lost, the positive voltage of the Zener diode D563 is 0V. The voltage applied across the D563 exceeds its regulated voltage. The D563 is breakdown-on and the Q807 is turned on by the forward bias voltage , After the conduction of the collector voltage through the isolation resistor R832 to the implementation of the protection circuit into the trigger voltage will also enter the standby protection state. (7) field output over-current protection circuit by the over-current sampling resistor R578, detection amplifier Q557 composition. On-the-spot output circuit short circuit leakage fault, and the field output current increases