公开(公告)号：US20220149734A1

公开(公告)日：2022-05-12

申请号：US17511813

申请日：2021-10-27

Applicant: uPI semiconductor corp.

Inventor： Chih-Lien CHANG ,  Wei-Hsiu HUNG ,  Chun-Ming LU ,  Min-Rui LAI

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/12 ,  H03K7/08

Abstract: A control circuit of a power converter includes a sensing circuit, a ramp signal generation circuit and a PWM circuit. The sensing circuit, coupled to an output circuit, provides a current sensing signal. The ramp signal generation circuit includes a transient circuit and a signal generation circuit. The transient circuit receives the current sensing signal and generates a variable reference voltage. The signal generation circuit provides a ramp signal according to the variable reference voltage. The PWM circuit provides a PWM signal to the output circuit according to the ramp signal. When current sourcing occurs, it continues for a first default time. A transient state during current sourcing continues for a second default time less than first default time. The variable reference voltage is changed from a default value to an adjusted value during the second default time and restored to the default value after the second default time.