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:
Jan. 14, 2020
Filed:
Aug. 29, 2016
Mornsun Guangzhou Science & Technology Co., Ltd., Guangzhou, Guangdong, CN;
Baojun Wang, Guangdong, CN;
MORNSUN GUANGZHOU SCIENCE & TECHNOLOGY CO., LTD., Guangzhou, Guangdong, CN;
Abstract
A switch power supply having active power factor correction is provided, including a power factor correction (PFC) circuit, a filter circuit, a main power stage, a first capacitor and an indicating circuit. The indicating circuit consists of a light emitting diode (LED) and an inductor; and the current direction of power supplied from the PFC circuit to the main power stage through the inductor is opposite to the conduction direction of the LED. The filter circuit at least comprises an electrolytic capacitor. When the electrolytic capacitor is normal, the LED does not emit light. When the equivalent series resistance (ESR) of the electrolytic capacitor sharply rises, the exciting current appears in the inductor. When a power transistor in the main power stage is switched off, the exciting current passes through the LED for freewheeling and enables the LED to emit light.