公开(公告)号：US10256735B2

公开(公告)日：2019-04-09

申请号：US15053263

申请日：2016-02-25

申请人： FAIRCHILD SEMICONDUCTOR CORPORATION

发明人： Zhibo Tao ,  Jung-Sheng Chen ,  Li Lin ,  Kai-Fang Wei ,  Chih-Hsien Hsieh ,  Hangseok Choi ,  Yue-Hong Tang

IPC分类号： H02M3/335 ,  H02M1/00

摘要： A switched-mode power supply with near valley switching includes a quasi-resonant converter. The converter includes a switch element that is turned on not only at the valley, but also in a window range of ΔtNVW close to the valley, where the voltage across the switch element is at its minimum. This advantageously reduces switching loss and maintains a balance between efficiency and frequency variation.

公开(公告)号：US10897206B2

公开(公告)日：2021-01-19

申请号：US16280241

申请日：2019-02-20

申请人： FAIRCHILD SEMICONDUCTOR CORPORATION

发明人： Zhibo Tao ,  Jung-Sheng Chen ,  Li Lin ,  Kai-Fang Wei ,  Chih-Hsien Hsieh ,  Hangseok Choi ,  Yue-Hong Tang

IPC分类号： H02M3/335 ,  H02M1/00

摘要： A switched-mode power supply with near valley switching includes a quasi-resonant converter. The converter includes a switch element that is turned on not only at the valley, but also in a window range of ΔtNVW close to the valley, where the voltage across the switch element is at its minimum. This advantageously reduces switching loss and maintains a balance between efficiency and frequency variation.

公开(公告)号：US10027165B2

公开(公告)日：2018-07-17

申请号：US15600565

申请日：2017-05-19

申请人： FAIRCHILD SEMICONDUCTOR CORPORATION

发明人： Zhibo Tao ,  Zhao-Jun Wang ,  Chih-Hsien Hsieh ,  Li Lin

IPC分类号： H02M3/335 ,  H02J9/06 ,  H02M7/487 ,  H02M1/42 ,  H02M1/00

摘要： An electrical circuit for a power supply includes a primary-side controller integrated circuit (IC) that outputs a drive signal on a switch pin to control a switching operation of a switch that is coupled to a primary winding of a transformer. The primary-side controller IC places the switch pin at high impedance during a sense window and turns on the switch in response to sensing a dynamic detection signal on the switch pin during the sense window. The dynamic detection signal is induced by a secondary-side controller IC by controlling switching of a switch that is coupled to a secondary winding of the transformer when the output voltage drops below a predetermined threshold during standby or other low load conditions.