Title:
POWER FACTOR IMPROVEMENT CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2023/048074
Kind Code:
A1
Abstract:
This power factor improvement circuit comprises: a serial circuit in which a reactor L and a control switch Q1 are serially connected to both terminals of a rectifier circuit 2 that rectifies an input voltage from an AC power supply; a serial circuit of a synchronous rectification switch Q2 and an output capacitor C1 at two main terminals of the control switch; and a control circuit 10 which alternately turns on/off the control switch and the synchronous rectification switch so that an output voltage of the output capacitor becomes a first prescribed value, and controls an on time of the control switch so that a peak value of a current flowing through the control switch is proportional to the input voltage. The control circuit turns on/off the control switch and the synchronous rectification switch in order to adjust a reverse excitation amount that reversely excites the reactor by causing a current, flowing through a reactor, to flow backward from an output voltage side to an input voltage side, wherein the reverse excitation amount is adjusted to a second prescribed value regardless of an input voltage Vi.
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Inventors:
CHIBA AKITERU (JP)
ISHIKURA KEITA (JP)
ISHIKURA KEITA (JP)
Application Number:
PCT/JP2022/034684
Publication Date:
March 30, 2023
Filing Date:
September 16, 2022
Export Citation:
Assignee:
GS YUASA INT LTD (JP)
International Classes:
H02M7/12
Foreign References:
| JP2021052578A | 2021-04-01 | |||
| JP2016220342A | 2016-12-22 |
Other References:
HUANG QINGYUN; YU RUIYANG; MA QINGXUAN; HUANG ALEX Q.: "Predictive ZVS Control With Improved ZVS Time Margin and Limited Variable Frequency Range for a 99% Efficient, 130-W/in3 MHz GaN Totem-Pole PFC Rectifier", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 34, no. 7, 1 July 2019 (2019-07-01), USA , pages 7079 - 7091, XP011722111, ISSN: 0885-8993, DOI: 10.1109/TPEL.2018.2877443
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