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:
Jul. 21, 2020
Filed:
May. 09, 2018
Shenzhen Sendis Semiconductor Co., Ltd, Shenzhen, CN;
Xiaoyu Chen, Shenzhen, CN;
Xunsheng Deng, Shenzhen, CN;
Bo Chen, Shenzhen, CN;
Yanquan Mai, Shenzhen, CN;
SHENZHEN SENDIS SEMICONDUCTOR CO., LTD., Shenzhen, CN;
Abstract
An LED driving device and a constant power dimming circuit and dimming method therefor. The constant power dimming circuit comprises a line voltage compensation module, a modulation module, a filtering module, and a constant current source module. The line voltage compensation module detects changes in line voltage and outputs a first reference voltage. The modulation module modulates the first reference voltage and outputs to the filtering module a second reference voltage. The filtering module filters the second reference voltage signal and then outputs a third reference voltage to the constant current source module. The constant current source module outputs constant current to drive an LED load to operate. By controlling a constant current source circuit, when the duty cycle of the PWM signal is not changed but a mains input voltage is changed, the input power of the system can be maintained constant, and voltage flicker is reduced.