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. 31, 2006
Filed:
May. 23, 2005
Mitsuo Saeki, Kawasaki, JP;
Hidetoshi Yano, Kawasaki, JP;
Hidekiyo Ozawa, Kawasaki, JP;
Seiya Kitagawa, Kawasaki, JP;
Toshiyuki Matsuyama, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Kyuichi Takimoto, Kasugai, JP;
Yoshiaki Sano, Kasugai, JP;
Mitsuo Saeki, Kawasaki, JP;
Hidetoshi Yano, Kawasaki, JP;
Hidekiyo Ozawa, Kawasaki, JP;
Seiya Kitagawa, Kawasaki, JP;
Toshiyuki Matsuyama, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Kyuichi Takimoto, Kasugai, JP;
Yoshiaki Sano, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A direct-current to direct-current conversion (DC/DC) apparatus includes a control circuit having an error amplifier for voltage control, basing the conversion on a pulse width modulation control using an output of the error amplifier. The error amplifier inputs a voltage signal corresponding to an output voltage of a DC/DC result and a plurality of reference voltage signals. The DC/DC apparatus also includes a soft start capacitor to provide one of the plurality of reference voltage signals. The error amplifier amplifies a difference between the voltage signal corresponding of the output voltage of a DC/DC result and a voltage signal of a lower potential among the plurality of reference voltage signals and carries out the pulse width modulation control. Furthermore, the control circuit includes a circuit for discharging charges corresponding to the output voltage of the DC/DC result when a power supply to the control circuit is turned off.