AUXILIARY CONVERTER CIRCUIT AND ITS METHOD OF OPERATION

WIPO Patent Application WO/2019/137388

A1

An auxiliary converter circuit for regulating an input current to a main switching converter circuit. The auxiliary converter circuit has a voltage detector for determining a change in a voltage across the auxiliary converter circuit, and a current sensor for sensing an input current to the main switching converter circuit. The auxiliary converter circuit also has a current compensation circuit that includes a comparator circuit arranged to compare the sensed input current with a reference current; and a controlled current circuit. The controlled current circuit is arranged to selectively provide a positive compensation current and a negative compensation current to the input current, based on the determined voltage change and the comparison, for suppressing harmonic distortion and electromagnetic interference in the input current.

CHAN ON BON PETER (CN)

PCT/CN2019/070962

July 18, 2019

January 09, 2019

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ANAPP TECH LIMITED (CN)

H02M1/42

CN103152931A	2013-06-12
US20140167712A1	2014-06-19
CN105471238A	2016-04-06
CN102647150A	2012-08-22

GOSWAMI RAJIB ET AL.: "2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE", 20 September 2015, IEEE, article "Design of an active differential mode current filter for a boost power factor correction AC-DC converter"
YUEN KUEN-FAAT ET AL.: "2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE", 14 September 2014, IEEE, article "A ripple-free input current PFC using power semiconductor filter"

CHINA SCIENCE PATENT & TRADEMARK AGENT LTD. (CN)

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