Title:
NOISE FILTER CIRCUIT FOR ACTIVE POWER FACTOR IMPROVING TYPE POWER SOURCE
Document Type and Number:
Japanese Patent JPH05204478
Kind Code:
A
Abstract:
PURPOSE:To improve EMI characteristic by constituting LPF with the capacitor of a filter circuit and the inductor of a boosting converter part so as to reduce a switching frequency noise. CONSTITUTION:The boosting converter part 22 inputs AC rectified by a rectification circuit DB through an inductor L3, turns it on/off with a switching device Q and charges it to a capacitor C3 through a diode D. A power factor improvement control circuit 24 turns a switching element Q on/off with high switching frequency to stabilize the output of the boosting converter part 22. LPF is constituted of a capacitor C4 connected between a loading line and a feed-back line, which are communicated with the rectification circuit DB and the boosting converter 22 and the inductor L3 of the boosting converter part 22 so that the switching frequency noise is reduced. Thus, the EMI characteristic is improved.
Inventors:
SUZUKI YUICHI
Application Number:
JP1540992A
Publication Date:
August 13, 1993
Filing Date:
January 30, 1992
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
G05F1/70; H02J3/01; H02M1/14; H02M7/06; H02M7/12; H02M7/21; (IPC1-7): G05F1/70; H02J3/01; H02M1/14; H02M7/06; H02M7/21
Attorney, Agent or Firm:
Shinsuke Ozawa