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Title:
POWER FACTOR IMPROVEMENT CIRCUIT AND SWITCHING POWER SUPPLY DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/198360
Kind Code:
A1
Abstract:
Provided is a power factor improvement circuit capable of suppressing the occurrence of an overshoot even during instantaneous stop in such a short time that conventionally a soft start operation is impossible, and also provided is a switching power supply device using the power factor improvement circuit. The power factor improvement circuit is provided with: an error signal generation unit for outputting a signal for amplifying the difference between the output voltage of a boost chopper and a reference voltage; a response control unit for controlling the response characteristic of the error signal generation unit; an oscillation unit for outputting a triangle wave signal; a zero current detection unit for detecting the zero current of the inductor current of the boost chopper; a drive signal generation unit for generating a drive signal for switching elements on the basis of a zero current detection signal, an error signal, and the triangle wave signal; and an input interruption detection unit for detecting an interruption state of an AC input voltage on the basis of the zero current detection signal. When the input interruption detection unit detects an input interruption state, the oscillation unit performs control so as to increase the slope of the triangle wave signal as compared with when not detecting the input interruption state.

Inventors:
HIASA Nobuyuki (1-1, Tanabeshinden, Kawasaki-ku, Kawasaki-sh, Kanagawa 30, 〒2109530, JP)
Application Number:
JP2019/007383
Publication Date:
October 17, 2019
Filing Date:
February 26, 2019
Export Citation:
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Assignee:
FUJI ELECTRIC CO.,LTD. (1-1 Tanabeshinden, Kawasaki-ku Kawasaki-sh, Kanagawa 30, 〒2109530, JP)
International Classes:
H02M3/155
Domestic Patent References:
WO2013180297A22013-12-05
Foreign References:
JP2016063603A2016-04-25
JP2010220330A2010-09-30
JP2017229209A2017-12-28
Attorney, Agent or Firm:
HIROSE Hajime et al. (NICHIEI Patent and Trademark Attorneys, Shiroyama Trust Tower 32F 3-1, Toranomon 4-chome, Minato-k, Tokyo 32, 〒1056032, JP)
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