US Patent 7379313 Voltage conversion device

Patent 7379313 was granted and assigned to Toyota on May, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Toyota

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7379313

Date of Patent

May 27, 2008

Patent Application Number

10562930

Date Filed

February 9, 2005

Patent Primary Examiner

‌

Gary L Laxton

Patent abstract

A control device (30) calculates an upper limit value of a duty ratio (DR_Ulim) according to a voltage (Vm) from a voltage sensor (13) and a threshold voltage (OVb) when an overvoltage is determined to have been applied to a battery (B), and determines a duty ratio (DR) for providing switching control to NPN transistors (Q1, Q2) in a range lower than the calculated upper limit value of the duty ratio (DR_Ulim). The control device (30) uses the determined duty ratio (DR) to provide switching control to the NPN transistors (Q1, Q2). Then, an up-convener (12) converts a direct current voltage (Vb) from the battery (B) into the output voltage (Vm) such that an overvoltage is not applied to the battery (B).