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:
Jan. 04, 2011
Filed:
May. 09, 2006
Eiji Kasai, Toyota, JP;
Yoichi Fujinori, Miyoshi-cho, JP;
Takatoshi Saito, Toyota, JP;
Masaharu Yamashita, Miyoshi-cho, JP;
Ippei Yamazaki, Toyota, JP;
Shuji Fujita, Miyoshi-cho, JP;
Eiji Kasai, Toyota, JP;
Yoichi Fujinori, Miyoshi-cho, JP;
Takatoshi Saito, Toyota, JP;
Masaharu Yamashita, Miyoshi-cho, JP;
Ippei Yamazaki, Toyota, JP;
Shuji Fujita, Miyoshi-cho, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
In a power supply apparatus, a power supply circuit includes a primary power supply circuit including a high-voltage battery and a step-down circuit for stepping down the voltage of the high-voltage battery, and a secondary power supply circuit including a low-voltage battery and a step-up circuit for stepping up the voltage of the low-voltage battery. The primary power supply circuit and the secondary power supply circuit are connected in parallel. An output voltage of the secondary power supply circuit is set to be lower than an output voltage of the primary power supply circuit. When the output voltage of the primary power supply circuit becomes lower than a target voltage of the secondary power supply circuit, the voltage stepped-up by the step-up circuit is supplied to a motor drive circuit. Accordingly, power supply backup of an electric power steering apparatus can be performed at low cost.