EP 3790360 A4 20210602 - LED DIMMING CIRCUIT, DIMMING APPARATUS AND DIMMING METHOD FOR REDUCING HARMONIC DISTORTION
Title (en)
LED DIMMING CIRCUIT, DIMMING APPARATUS AND DIMMING METHOD FOR REDUCING HARMONIC DISTORTION
Title (de)
LED-DIMMERSCHALTUNG, DIMMVORRICHTUNG UND DIMMVERFAHREN ZUR REDUZIERUNG DER HARMONISCHEN VERZERRUNG
Title (fr)
CIRCUIT DE GRADATION DE DEL, APPAREIL DE GRADATION ET PROCÉDÉ DE GRADATION PERMETTANT DE RÉDUIRE UNE DISTORSION HARMONIQUE
Publication
Application
Priority
- CN 201810401233 A 20180428
- CN 2019077115 W 20190306
Abstract (en)
[origin: EP3790360A1] 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.
IPC 8 full level
H05B 44/00 (2022.01); H05B 45/36 (2020.01); H05B 45/32 (2020.01); H05B 47/19 (2020.01)
CPC (source: CN EP)
H05B 45/00 (2020.01 - CN); H05B 45/32 (2020.01 - EP); H05B 45/36 (2020.01 - EP); H05B 47/19 (2020.01 - EP)
Citation (search report)
- [Y] CN 101730335 A 20100609 - DENGFENG MICROELECTRONICS CO L
- [Y] US 2005052305 A1 20050310 - VOICU GELU [US], et al
- [Y] US 5831566 A 19981103 - GINETTI BERNARD [FR]
- [Y] CN 103025031 A 20130403 - SHANGHAI AUSTAR LIGHTING ELECTRICAL IND CO LTD
- [Y] US 2011187283 A1 20110804 - WANG SHIJU [US], et al
- [Y] WO 2016138204 A1 20160901 - DIODES INC [US]
- [Y] CN 107222953 A 20170929 - XU RUIQING
- [Y] CN 103124459 A 20130529 - ANTEYA TECHNOLOGY CORP, et al
- See also references of WO 2019205818A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3790360 A1 20210310; EP 3790360 A4 20210602; CN 108495419 A 20180904; CN 108495419 B 20240514; WO 2019205818 A1 20191031
DOCDB simple family (application)
EP 19793821 A 20190306; CN 201810401233 A 20180428; CN 2019077115 W 20190306