公开(公告)号：US20220299546A1

公开(公告)日：2022-09-22

申请号：US17696520

申请日：2022-03-16

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Yuedong Chen ,  Junhong Li ,  Jiangwei Cheng

IPC: G01R19/04 ,  H02M1/00 ,  H02M1/42

Abstract: A method for detecting a variation of input voltage. The method is generating an indication signal based on the input voltage, and comparing the input voltage with a first reference signal. The first reference signal is smaller than the indication signal, and if the input voltage is consistently smaller than the first reference signal during a first time duration from the moment when the input voltage is decreased to the first reference signal, the indication signal is decreased after the first time duration.