Title:
LED DIMMING CIRCUIT, DIMMING APPARATUS AND DIMMING METHOD FOR REDUCING HARMONIC DISTORTION
Document Type and Number:
WIPO Patent Application WO/2019/205818
Kind Code:
A1
Abstract:
Disclosed in the present invention are an LED dimming circuit, dimming apparatus and dimming method for reducing harmonic distortion. The LED dimming circuit for reducing harmonic distortion comprises a voltage division module, a multipath selection module, a dimming decoding module, and a constant current source module. After a line voltage is divided by the voltage division module, corresponding amplitudes of voltage signals are output to the multipath selection module by different taps; the dimming decoding module performs decoding according to a received dimming input signal and outputs brightness data to the multipath selection module; the multipath selection module outputs, according to the brightness data, the voltage signals output from the corresponding taps of the voltage division module to the constant current source module; and the constant current source module controls, according to the currently received voltage signals, current passing through an LED light string. The present invention can meet the requirements of both dimming and low harmonic distortion, so that higher harmonics are not introduced while dimming is performed, thereby reducing power grid interference and improving the working stability of a product.
Inventors:
MAI YANQUAN (CN)
GUO YOU (CN)
GUO YOU (CN)
Application Number:
PCT/CN2019/077115
Publication Date:
October 31, 2019
Filing Date:
March 06, 2019
Export Citation:
Assignee:
SHENZHEN SENDIS SEMICONDUCTOR CO LTD (CN)
International Classes:
H05B44/00
Foreign References:
| CN103025031A | 2013-04-03 | |||
| CN101730335A | 2010-06-09 | |||
| CN103124459A | 2013-05-29 | |||
| CN108495419A | 2018-09-04 | |||
| CN208094850U | 2018-11-13 |
Other References:
See also references of EP 3790360A4
Attorney, Agent or Firm:
JOHNSON INTELLECTUAL PROPERTY AGENCY (SHENZHEN) (CN)
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