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US Patent 7692940 Voltage conversion device

Patent 7692940 was granted and assigned to Toyota on April, 2010 by the United States Patent and Trademark Office.

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Patent
Patent

Patent attributes

Current Assignee
Toyota
Toyota
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7692940
Patent Inventor Names
Sojiro Yokoyama1
Kiyoe Ochiai1
Masaki Okamura1
Date of Patent
April 6, 2010
Patent Application Number
11991402
Date Filed
December 14, 2006
Patent Primary Examiner
‌
Bao Q. Vu
Patent abstract

A voltage transformer, which is placed between a DC power source (B) and a motor (M1), includes: a voltage sensor (10) and an electric current sensor (11), which senses input and output of electric power to and from the DC power source (B); a buck-boost converter (12) having power control elements, which is placed in a path connecting between power lines (PL1) and (PL2) that establish the connection to the DC power source (B) and the connection to the motor (M1), respectively; and a controller (30) for controlling the buck-boost converter (12). The controller (30) monitors the change in the regenerated power that is supplied to the DC power source (B), based on the outputs from the voltage sensor (10) and the electric current sensor (11), and, if the amount of change in the regenerated power is greater than a predetermined amount, the controller (30) changes the operation mode of the buck-boost converter (12) from a rapid operation mode to a slow operation mode.

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