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:
May. 30, 2023
Filed:
Oct. 31, 2019
Delta Electronics (Shanghai) Co., Ltd., Shanghai, CN;
Xiaoping Fu, Shanghai, CN;
Xinghua Zhang, Shanghai, CN;
DELTA ELECTRONICS (SHANGHAI) CO., LTD., Shanghai, CN;
Abstract
A dimming circuit includes a DC/DC conversion unit and a control module. The control module provides a switching period reference, and samples an input voltage and an output voltage. The control module calculates a turn-on time according to the input voltage, the output voltage and a reference current signal. The control module generates a variation period signal which is cyclically-changed. The variation period signal is combined with the switching period reference or the turn-on time. Consequently, a pulse width modulation signal cyclically changed is generated by the switching period reference, the turn-on time and the variation period signal. Since the switching periods is cyclically changed, the average of the output current is close to the ideal value.