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:
Jan. 16, 2018
Filed:
May. 10, 2016
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Morio Iwamizu, Matsumoto, JP;
Yasuki Yoshida, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
In activating a motor, a gate voltage with which a power semiconductor element may supply a rush current of the motor is generated by a charge pump circuit, when a certain time (time until the rush current ends) has elapsed after activating the motor, a timer circuit operates a gate clamp circuit, which reduces the gate voltage of the power semiconductor element to reduce the current-carrying capability of the power semiconductor element. Subsequently, when the motor has caused a short-circuit failure, the power semiconductor element, because its gate voltage is reduced by the gate clamp circuit in advance, supplies only a load short current corresponding to the reduced gate voltage. Accordingly, the heat generation due to the short-circuit current is also small and an increase in temperature is also suppressed.