在测试阶段,在连接主电路之前,想要观察一下UC3875输出波形情况和各个波形的移相情况,就用可变电源分别给EA+(基准值),EA-(输出值)供电,CS+空脚,示波器连接OUTA,没有输出波形,是什么原因呢?采用的外围电路如下图所示。
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