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:
Apr. 06, 2021
Filed:
Dec. 05, 2019
Cypress Semiconductor Corporation, San Jose, CA (US);
Karri Rajesh, Visakhapatnam, IN;
Arun Khamesra, Bangalore, IN;
Cypress Semiconductor Corporation, San Jose, CA (US);
Abstract
Techniques for avoiding false negative sense (NSN) detection in a flyback AC-DC converter are described herein. In an example embodiment, a secondary side controller of the AC-DC converter comprises a frequency detector, a negative sense detector, and control logic. The frequency detector is configured to determine a frequency of an input signal from the drain node of a synchronous rectifier (SR) circuit on the secondary side of the AC-DC converter. The negative sense detector is configured to determine a negative voltage of the input signal. The control logic is configured to: enable the negative sense detector, when the frequency of the input signal rises above a frequency threshold value; and turn on the SR circuit to transfer power to the secondary side of the AC-DC converter, when the negative voltage of the input signal falls below a voltage threshold value.