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:
Jun. 16, 2015
Filed:
Jul. 01, 2008
George Young, Blackrock, IE;
Andrew Bernard Keogh, Glanmire, IE;
Seamus Martin O'driscoll, Cloyne, IE;
Peter Michael Meaney, Cloyne, IE;
William James Long, Cork, IE;
George Young, Blackrock, IE;
Andrew Bernard Keogh, Glanmire, IE;
Seamus Martin O'Driscoll, Cloyne, IE;
Peter Michael Meaney, Cloyne, IE;
William James Long, Cork, IE;
TEXAS INSTRUMENTS (CORK) LIMITED, Dublin, IE;
Abstract
This invention relates to a control circuit for a buck power factor correction (PFC) stage. Buck PFC stages are commonly used in low cost, high efficiency power converters. These buck PFC stages are typically controlled using a very slow control loop with a crossover frequency of the order of 10 to 20 Hz. However, such a slow response is unsuitable for applications requiring overvoltage protection. The present invention overcomes the problems with the known control circuits for buck PFC stages by implementing a two stage control circuit having a fast outer loop control circuit and a slow inner loop control circuit. The fast outer loop control circuit is in operation during low load conditions and the slow inner loop control circuit is only active under load.