Intel Corporation

Marvellworld Trade Ltd.

Bcd Shanghai Micro-electronics Company Limited

Sen Dou

Kai Chen

Wanfeng Zhang

Ravishanker Krishnamoorthy

Biing Long Shu

Xin Wu

Hong Liang Zhang

Zheng Ying

Guanghui He

Andong Zhao

Cong Zou

Yizhong Xie

A system for controlling a skip mode of a switching power supply and a PWM controller are provided. The system includes a feedback signal detection circuit configured to detect an output voltage of the switching power supply and generate a feedback signal related to the output voltage; a primary winding sampling circuit coupled with a primary winding of the switching power supply and configured to sample a sampling voltage of the primary winding; a skip mode soft control circuit configured to receive the feedback signal and output an electrical signal; and a comparison circuit configured to determine a threshold for the sampling voltage, where the skip mode is activated when the feedback signal is greater than a soft activation voltage threshold, and the skip mode is pre-exited when the feedback signal is less than a predetermined voltage threshold and greater than a soft exit voltage threshold.

System for controlling skip mode of switching power supply, and PWM controller

Disclosed is flyback converter having a controller that performs a startup switching process when the flyback converter is powered up, and then performs normal switching afterward. The controller includes a pulse generator to generate a control signal for normal switching. During startup switching, the controller may generate a control signal by output every Npulse from the pulse generator. In another embodiment, the controller may generate pulses based on a sense signal provided from an input section of the flyback converter.

Reducing voltage stress in a flyback converter design

A system to supply power to an electronic system, comprises a set of one or more power units each configured to transform an input voltage into an output voltage; and a line regulator coupled to a power unit and configured to modulate a duty cycle of the power unit and a load regulator configured to provide a second control signal to a power unit to selectively enable the power unit based on load information provided by the electronic system.

Power supply with separate line regulation and load regulation

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Shanghai, China

Sen Dou