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:
May. 30, 2006
Filed:
Dec. 06, 2002
Katsuhiko Furukawa, Utsunomiya, JP;
Keisuke Urushihara, Utsunomiya, JP;
Yuuichi Nakamura, Kawaguchi, JP;
Katsuhiko Furukawa, Utsunomiya, JP;
Keisuke Urushihara, Utsunomiya, JP;
Yuuichi Nakamura, Kawaguchi, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An automotive electric power unit is provided to reduce the occurrence of electromagnetic noise caused by change in magnetic fields when the current dropps to zero when an ignition switch is being switched off. When the ignition switch is switched off, an input voltage to an ON/OFF control terminal of a DC/DC converter gently decreases through a potential difference between terminals of a motor driving load connected thereto. Accordingly, a control device, for which a detecting voltage is set relatively high, first detects an OFF state of the ignition switch and disconnects power loads such as a cooling fan, air conditioner, and defroster from the DC/DC converter by regulating relays. Then, the DC/DC converter, for which a detecting voltage is set lower than the detecting voltage for the control device, detects the OFF state of the ignition switch and stops stepping down the voltage so that a charging current for a battery of the load current thereof is shut off.