The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 2025
Filed:
Nov. 20, 2023
Chengdu Monolithic Power Systems Co., Ltd., Chengdu, CN;
Xuefeng Chen, Hangzhou, CN;
Chengdu Monolithic Power Systems Co., Ltd., Sichuan, CN;
Abstract
A controller used in a switching power supply having a power switch and an energy storage element. A winding voltage of the energy storage element oscillates to provide an oscillation signal having one or more valleys during an OFF period of the power switch. The controller has a target valley number generator for providing a target locked valley number which is not exceeding an upper limit, a first comparison circuit for providing a first square wave signal by comparing a voltage sensing signal representative of the oscillation signal with a first threshold voltage, a second comparison circuit for providing a second square wave signal by comparing the voltage sensing signal with a second threshold voltage less than the first threshold voltage, and an upper limit updating circuit to determine if to update the upper limit.