To improve the input current total harmonic distortion (THD), the look-up table (LUT) method is used in the 360-800 Hz critical conduction mode (CRM) boost power factor correction (PFC) converter. When the ac line frequency changes drastically and suddenly, the zero-crossing detection method needs the half ac line period to follow the sudden frequency jump, causing a mismatching between the LUT and the ac line frequency. This mismatching in the time domain leads to a large current spike in the input current and even destruction in the PFC converter under some severe conditions. In this letter, a dynamic ac line frequency response method is proposed to eliminate this mismatching. The proposed method only needs to sample the input voltage, leading to a good performance in following the sudden frequency jump in a wide input voltage range. The effectiveness of the proposed method is verified with a 160 W GaN-based CRM boost PFC converter.

中文翻译：

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360-800 Hz CRM 升压 PFC 转换器中基于 LUT 的可变接通时间控制的动态交流线路频率响应方法


为了改善输入电流总谐波失真 (THD)，360-800 Hz 临界导通模式 (CRM) 升压功率因数校正 (PFC) 转换器采用查找表 (LUT) 方法。当交流线路频率发生剧烈且突然的变化时，过零检测方法需要半个交流线路周期来跟随突然的频率跳跃，导致LUT和交流线路频率之间不匹配。这种时域不匹配会导致输入电流出现大电流尖峰，甚至在某些恶劣条件下导致 PFC 转换器损坏。在这封信中，提出了一种动态交流线路频率响应方法来消除这种不匹配。所提出的方法只需要对输入电压进行采样，从而在宽输入电压范围内具有良好的跟踪突然频率跳跃的性能。该方法的有效性通过 160 W GaN 基 CRM 升压 PFC 转换器得到验证。