公开(公告)号：US11245336B2

公开(公告)日：2022-02-08

申请号：US16893325

申请日：2020-06-04

Applicant: Infinno Technology Corp.

Inventor： Yuan-Kai Cheng ,  Chun-Chiang Chen

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/00

Abstract: An over-current protection module for a flyback power supply having a transformer includes: a switch control unit, configured to generate a control signal in a first period to control a transistor switch coupled to a primary side of the transformer, wherein the transistor switch is turned on in a first duty cycle of the control signal and the transistor switch is turned off in a second duty cycle of the control signal; a transformation unit, configured to generate a compensation current according to the second duty cycle; a timing control unit, configured to output the compensation current to an impedance unit to generate an impedance cross voltage in a shut-off period of the transistor switch of the first period; and a current control unit, configured to determine an over-current reference voltage according to the impedance cross voltage for the over-current protection module in a second period following the first period.

公开(公告)号：US20210021197A1

公开(公告)日：2021-01-21

申请号：US16893325

申请日：2020-06-04

Applicant: Infinno Technology Corp.

Inventor： Yuan-Kai Cheng ,  Chun-Chiang Chen

IPC: H02M3/335 ,  H02M1/32

Abstract: An over-current protection module for a flyback power supply having a transformer includes: a switch control unit, configured to generate a control signal in a first period to control a transistor switch coupled to a primary side of the transformer, wherein the transistor switch is turned on in a first duty cycle of the control signal and the transistor switch is turned off in a second duty cycle of the control signal; a transformation unit, configured to generate a compensation current according to the second duty cycle; a timing control unit, configured to output the compensation current to an impedance unit to generate an impedance cross voltage in a shut-off period of the transistor switch of the first period; and a current control unit, configured to determine an over-current reference voltage according to the impedance cross voltage for the over-current protection module in a second period following the first period.