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使用110V/230V交流电源的许多应用需要一个ZCD(过零检测)电路来获取交流线路电压,例如,同步开关负载。一种ZCD方法是使用一个较大的限流电阻或电阻分压
Many applications that use a 110V / 230V AC power supply require a ZCD (zero-crossing detection) circuit to acquire the AC line voltage, for example, the synchronous switching load. A ZCD method uses a larger current-limiting resistor or resistor divider