Methods and apparatus for peak-voltage measurement of AC signals

Methods and apparatus for peak-voltage measurement of AC signals are disclosed. In described examples, an apparatus (300) includes: an input terminal for receiving an alternating current voltage signal; a clamping circuit (305) coupled to the input terminal and outputting a clamped voltage signal that is constrained in magnitude; a first comparator (307) outputting a first compare signal when the clamped voltage signal is a positive voltage that exceeds a positive threshold; a second comparator (309) outputting a second compare signal when the clamped voltage signal is a negative voltage that exceeds a negative threshold; a timer circuit (303) coupled to the first and second compare signals and outputting a time duration signal corresponding to a time between the first and second compare signals; and a logic circuit (301) coupled to the time duration output signal and determining a peak voltage of the alternative current voltage signal. 本申请案涉及用于AC信号的峰值电压测量的方法及设备。在所描述实例中，种设备(300)包含：输入端子，其用于接收交流电压信号；箝位电路(305)，其