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Patent Searching and Data


Title:
POWER SUPPLY CIRCUIT AND AUDIO SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/173117
Kind Code:
A1
Abstract:
A power supply circuit that generates DC voltage from AC voltage and comprises: a rectifier circuit that rectifies the AC voltage; a capacitor that smooths the rectified voltage; a first switch element arranged upon a path that charges the capacitor; a comparator circuit that compares a reference voltage and an index voltage corresponding to the smoothed voltage; and a drive circuit that sets the first switch element to on when the index voltage drops below the reference voltage and sets the first switch element to off when the index voltage exceeds the reference voltage.

Inventors:
KATAOKA, Takuya (Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
SHIMA, Hitoshi (Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
Application Number:
JP2017/011201
Publication Date:
September 27, 2018
Filing Date:
March 21, 2017
Export Citation:
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Assignee:
YAMAHA CORPORATION (10-1, Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
International Classes:
H02M7/12; H03K17/691
Foreign References:
JPH10201235A1998-07-31
JPS6359728A1988-03-15
JPS62135274A1987-06-18
Attorney, Agent or Firm:
OHBAYASHI, Akira et al. (Ochanomizu Wing Building, 6th Floor 2-15-13 Hongo Bunkyo-k, Tokyo 33, 〒1130033, JP)
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