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:
Nov. 26, 2013
Filed:
Feb. 25, 2009
Toshiaki Oya, Sakai, JP;
Toshiaki Oya, Sakai, JP;
JTEKT Corporation, Osaka-shi, JP;
Abstract
An auxiliary power supply device that can always supply stable auxiliary power at the time of using an auxiliary power source and an electric power steering device employing the auxiliary power supply device are provided. In the auxiliary power supply device including a discharge circuit selectively constituting a state where a motor is supplied with power from only a battery and a state where the motor is supplied with power from a power source in which an auxiliary power source is connected in series to the battery by PWM control, when the power consumption of the battery is greater than an upper limit, a control circuit is provided which controls the power consumption to return to the upper limit by performing an electric power feedback control using a duty as an amount of operation at the time of turning on and off switching elements by a PWM control on the basis of the difference.