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:
Oct. 30, 2018
Filed:
Feb. 13, 2017
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Tadanori Yamada, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, Kanagawa, JP;
Abstract
An inverter drive device for driving a semiconductor switching element that controls an output current of an inverter. An inverter drive device includes a drive circuit configured to apply a drive voltage to the semiconductor switching element, to thereby turn the semiconductor switching element on and off, the turning off of the semiconductor switching element causing a counter electromotive force to be generated therein, a clamping diode configured to clamp a voltage of the generated counter electromotive force, a voltage dividing resistor configured to detect a voltage that is proportional to a current flowing through the clamping diode, and an auxiliary drive circuit configured to generate a control voltage in accordance with the voltage detected by the voltage dividing resistor, and to apply the control voltage to the semiconductor switching element, to thereby turn the semiconductor switching element on.