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发明公开
CN111149005A 过零检测电路 有权

过零检测电路
摘要：
一种过零检测电路，包括：过零检测单元，该过零检测单元用于比较分别通过二极管从其间施加AC信号的第一节点和第二节点输入的第一监测目标信号和第二监测目标信号，从而生成第一比较信号；以及逻辑单元，该逻辑单元用于根据所述第一比较信号估计所述AC信号的过零，从而生成过零检测信号。所述过零检测电路优选地包括监测单元，该监测单元用于将所述第一监测目标信号和所述第二监测目标信号调整为适应于输入到所述过零检测单元。所述逻辑单元优选地对所述第一比较信号的周期进行计数，并使用其计数值来估计所述AC信号的过零。
摘要（英）：

This zero-crossing detection circuit comprises a zero crossing detection unit for generating a first comparison signal by comparing a first monitored signal and second monitored signal respectively input through diodes from a first node and second node that have an AC signal applied therebetween, and a logic unit for generating a zero crossing detection signal by estimating the zero crossing of the AC signal from the first comparison signal. It is preferable for the zero crossing detection circuit to be provided with a monitoring unit for making the first monitored signal and second monitored signal suitable for input into the zero crossing detection unit. It is preferable for the logic unit to count first comparison signal periods and use the counted value to estimate the zero crossing of the AC signal.

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