The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2012
Filed:
Sep. 15, 2010
Masato Miyazaki, Hamamatsu, JP;
Hirotaka Kawai, Hamamatsu, JP;
Tatsuya Kishii, Iwata, JP;
Masayoshi Nakamura, Nagaokakyo, JP;
Ken Makino, Toyama, JP;
Masato Miyazaki, Hamamatsu, JP;
Hirotaka Kawai, Hamamatsu, JP;
Tatsuya Kishii, Iwata, JP;
Masayoshi Nakamura, Nagaokakyo, JP;
Ken Makino, Toyama, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A charge pump includes a switching circuit which is interposed among first and second output capacitors, a flying capacitor, and an input power supply; and a control unit which controls the switching circuit. The charge pump is operated in an operation mode including a high-voltage outputting mode, a low-voltage outputting mode, and a relay mode. The control unit controls the switching circuit so that respective charging voltages of the first and second capacitors that are charged in the high-voltage outputting mode are gradually lowered. The control unit changes the operation mode of the charge pump by relay transition from the high-voltage outputting mode through the relay mode to the low-voltage outputting mode when a voltage lower command is given during a period when the operation mode of the charge pump is in the high-voltage outputting mode.