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:
Dec. 04, 2018
Filed:
Aug. 14, 2017
Fairchild Semiconductor Corporation, Sunnyvale, CA (US);
Gwanbon Koo, Sunnyvale, CA (US);
Dibyendu Rana, Milpitas, CA (US);
FAIRCHILD SEMICONDUCTOR CORPORATION, Phoenix, AZ (US);
Abstract
An active clamp flyback controller includes first and second input terminals, a clamp voltage detection circuit, and an overvoltage protection circuit. The first input terminal is adapted to be coupled to a terminal of a clamp capacitor. The second input terminal receives a feedback signal proportional to a voltage across an auxiliary winding of a flyback transformer. The clamp voltage detection circuit is coupled to the first and second input terminals, and detects a clamp voltage as a difference between a voltage at the first input terminal and an input voltage, the clamp voltage detection circuit calculating the input voltage using a signal from the second input terminal. The overvoltage protection circuit is coupled to the clamp voltage detection circuit for comparing the clamp voltage to a threshold and triggering a protection operation if the clamp voltage is greater than the threshold.