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1. US20090140673 - Electric power steering system apparatus

官庁
アメリカ合衆国
出願番号 11994560
出願日 09.05.2006
公開番号 20090140673
公開日 04.06.2009
特許番号 07863845
特許付与日 04.01.2011
公報種別 B2
IPC
H02P 1/00
H電気
02電力の発電,変換,配電
P電動機,発電機,回転変換機の制御または調整;変圧器,リアクトルまたはチョークコイルの制御
1電動機または回転変換機の起動装置
出願人 Toyota Jidosha Kabushiki Kaisha
発明者 Kasai Eiji
Fujinori Yoichi
Saito Takatoshi
Yamashita Masaharu
Yamazaki Ippei
Fujita Shuji
代理人 Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
優先権情報 2005197053 06.07.2005 JP
発明の名称
(EN) Electric power steering system apparatus
要約
(EN)

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.