Search International and National Patent Collections

1. (WO2018157413) CURRENT-SHARING CIRCUIT FOR DC-DC CONVERTERS

Pub. No.:    WO/2018/157413    International Application No.:    PCT/CN2017/076016
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: H02M 1/10
Applicants: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE COMPANY LIMITED
Inventors: HU, Xiaoyong
GAO, Ziyang
SHUM, Tak Lok
Title: CURRENT-SHARING CIRCUIT FOR DC-DC CONVERTERS
Abstract:
Two or more power converters are connected in parallel to supply power current to a joining node through connecting resistors. An output voltage before the connecting resistor in each power converter is sampled and divided by a sampling ratio to generate sampled voltages for each power converter. A current sharing circuit for each power converter receives the local sampled voltage and another sampled voltage from another power converter. The current sharing circuit generates an adjustment voltage that is injected into a feedback loop. The adjustment voltage modifies the output voltage of the power converter, adjusting and balancing the power current delivered by that power converter. Power currents from several power converters are reduced and balanced when the same sampling ratio is used for all power converters. Current hogging by one power converter is prevented.