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徒弟:在彩电开关电源中,因稳压取样脉宽调制环路失控而引起的“三无”故障屡见不鲜,同时对整机特别是对行、场等负载电路的危害性(大面积烧损)也很大。因此,请师傅较为详细地讲述稳压取样电路、脉宽调制电路以及相关故障特点与检修判断方法好吗?师傅:在开关电源中,稳压取样、脉宽控制环路主要由取样比较误差放大电路和脉宽(或频率)调制电路两大部分组成。
Apprentice: In the color TV switching power supply, due to the regulator sampling pulse width modulation loop out of control caused by the “three no ” failures are common, while the whole machine, especially the line, field and other load circuit hazards (large area burn Loss) is also great. Therefore, please tell the master in more detail about the regulator sampling circuit, pulse width modulation circuit and related fault characteristics and maintenance judgment method? Master: In the switching power supply, the regulator sampling, pulse width control loop mainly by the sampling error amplification Circuit and pulse width (or frequency) modulation circuit composed of two parts.