Patent · US Active

Quasi-resonant controlled switching regulator and the method thereof

US8687387B2 · kind B2 · utility

3Cited by

7References

20Claims

0Family size

Assignee

Chengdu Monolithic Power Systems Co., Ltd. · CN

Inventors

Yike Li · Chengdu, CN
Rui Wang · San Jose, US
En Li · Lo Wu, CN

Key dates

Filing date	Aug 25, 2011
Grant date	Apr 1, 2014
Priority date	—
Expiry date	Mar 13, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B70/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A frequency limitation method used in a quasi-resonant controlled switching regulator is disclosed. The switching frequency is limited by setting a minimum time period, such as a minimum switching period or a minimum OFF time period. The minimum time period is varying according to the difference between the minimum time period of the previous cycle and an offset value, so as to eliminate the audible noise caused by the frequency hopping when the minimum OFF time period is close to the valley of a quasi-resonant signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.