Title:
LED DRIVING DEVICE AND CONSTANT POWER DIMMING CIRCUIT AND DIMMING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/210166
Kind Code:
A1
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 (10), a modulation module (20), a filtering module (30), and a constant current source module (40). The line voltage compensation module (10) detects changes in line voltage and outputs a first reference voltage having compensation information according to a current line voltage. The modulation module (20) modulates the first reference voltage according to an externally input PWM signal and outputs to the filtering module (30) a second reference voltage having both the compensation information and PWM duty cycle information. The filtering module (30) filters the second reference voltage signal and then outputs a third reference voltage to the constant current source module (40). The constant current source module (40) is controlled to output constant current to drive an LED load to operate. By controlling a constant current source circuit by outputting the voltage having both the line voltage compensation information and the PWM duty cycle information, 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.
Inventors:
CHEN XIAOYU (CN)
DENG XUNSHENG (CN)
CHEN BO (CN)
MAI YANQUAN (CN)
DENG XUNSHENG (CN)
CHEN BO (CN)
MAI YANQUAN (CN)
Application Number:
PCT/CN2018/086102
Publication Date:
November 22, 2018
Filing Date:
May 09, 2018
Export Citation:
Assignee:
SHENZHEN SENDIS SEMICONDUCTOR CO LTD (CN)
International Classes:
H05B44/00
Foreign References:
| CN107071982A | 2017-08-18 | |||
| CN206775787U | 2017-12-19 | |||
| CN203801121U | 2014-08-27 | |||
| CN105657903A | 2016-06-08 | |||
| CN103607810A | 2014-02-26 | |||
| CN103108470A | 2013-05-15 | |||
| US9125273B2 | 2015-09-01 |
Other References:
See also references of EP 3627971A4
Attorney, Agent or Firm:
JOHNSON INTELLECTUAL PROPERTY AGENCY (SHENZHEN) (CN)
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