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:
Oct. 15, 2024
Filed:
May. 31, 2022
Cypress Semiconductor Corporation, San Jose, CA (US);
Arun Khamesra, Bangalore, IN;
Pragyan S. Biswal, Odisha, IN;
Hariom Rai, Bangalore, IN;
Saravanan Murugesan, Bangalore, IN;
Cypress Semiconductor Corporation, San Jose, CA (US);
Abstract
A primary-side-controlled fly-back converter is provided to eliminate cross-conduction between a power-switch (PS) on a primary side and a synchronous-rectifier (SR) on a secondary side when operating in continuous conduction mode (CCM). Generally, the converter includes a transformer having a primary coupled to a rectified AC input through the PS, and a secondary coupled to a DC output through the SR, the SR having a drain coupled to the secondary winding. A fly-back-controller includes a primary-controller operable to control a duty cycle of the PS, and a secondary-controller operable to turn OFF the SR when the PS turns ON in CCM. The secondary-controller includes a CCM zero-crossing-detector comparator having a first input coupled to the drain of the SR through a capacitor, and is operable to detect a sharp change in a drain voltage when the PS turns ON during CCM, and to output a signal to turn OFF the SR.