Method and apparatus for generating an adaptive switching frequency for operating power factor correction circuit

摘要

A method of operating a power factor correction (PFC) circuit and a corresponding power factor correction circuit include determining an adaptive switching frequency of the PFC circuit related to a current of the boost inductor of the PFC circuit, and operating the PFC circuit at a light load based on the adaptive switching frequency.

主权项

1. A method of operating a PFC (power factor correction) circuit having a main PFC FET and a boost inductor, the method comprising:
determining an adaptive switching frequency of the PFC circuit related to a current of the boost inductor; and operating the PFC circuit at a light load based on the adaptive switching frequency, wherein determining the adaptive switching frequency of the PFC circuit comprises determining a time that the current of the boost inductor resonates from a negative value to a zero value, and generating the adaptive switching frequency based on the determined time.