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:
Sep. 26, 2017
Filed:
Jul. 15, 2016
Alitek Technology Corp., Taipei, TW;
Wen-Hung Huang, Taipei, TW;
Kashel Dmitry, Taipei, TW;
ALITEK TECHNOLOGY CORP., Taipei, TW;
Abstract
A PFC switching power conversion circuit providing low THD, including: a bridge rectifier for providing an input voltage according to an AC voltage; an electromagnetic interference filtering circuit for providing a line voltage according to the input voltage; a switching power converter for converting the line voltage to an output voltage or current under a control of a driving voltage, the driving voltage causing a switching current to flow through a main inductor; and a controller for receiving and processing at least one feedback signal from the switching power converter to generate the driving voltage in a constant on-time manner, the controller including an off-time detector and a timer, the off-time detector being used to detect decreasing periods of the switching current to determine respective off-time periods, and the timer being used to set a minimum limit on the respective off-time periods.