公开(公告)号：US20250023443A1

公开(公告)日：2025-01-16

申请号：US18366707

申请日：2023-08-08

Applicant: Power Forest Technology Corporation

Inventor： Yu-Chao Lin ,  Kuan-Chun Fang ,  Zhi-Yang Zhang ,  Chien-Wei Kuan

IPC: H02M1/00 ,  H02M3/24

Abstract: A feedback circuit is used for a power supply device. The power supply device includes a primary side circuit and a secondary side circuit. The feedback circuit includes a feedback voltage generation circuit, a base voltage generation circuit, and a compensation signal generation circuit. The feedback voltage generation circuit is electrically connected to the secondary side circuit. The feedback voltage generation circuit generates a feedback voltage according to a bias voltage and an output voltage of the power supply device. The base voltage generation circuit generates a base voltage according to the feedback voltage. The compensation signal generation circuit generates a compensation signal according to the feedback voltage and the base voltage and provides the compensation signal to a controller in the primary side circuit. A voltage value of the feedback voltage is lower than a voltage value of the bias voltage. The voltage value of the feedback voltage varies with the change of the output voltage.