In residential air-conditioner system, the active power factor correction should be started at zero-crossing phase of input AC voltage, in order to avoid the input current overshoot at non-zero phase voltage starting. A frequency self-adaptively zero-crossing detection approach is presented in this paper, which detects the voltage frequency by open-loop method and zero-crossing phase by input current peak closed-loop tracking. The proposed approach can be applied in 50Hz and 60Hz. This method is without input voltage measure, and it can detect the voltage short interruptions in real-time.%在家用空调系统的有源功率因数校正中，需要在输入电压的过零时刻开启功率因数校正功能，以避免非零相位时刻开启功率因数校正功能造成的输入电流超调冲击。提出一种频率自适应的过零检测方法，根据输入电流开环检测电网电压频率，在已知频率的基础上采用输入电流峰值闭环跟踪的方法进行过零检测。该方法不需要检测输入电压，能够自动适应50 Hz与60 Hz应用，同时该方法能够实时侦测电网电压短时中断。
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