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:
Mar. 20, 2018
Filed:
Sep. 01, 2014
Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd., Kiyosu-shi, Aichi, JP;
Keiji Nagasaka, Tokyo, JP;
Hidetaka Sato, Aichi, JP;
MITSUBISHI HEAVY INDUSTRIES AUTOMOTIVE THERMAL SYSTEMS CO., LTD., Kiyosu-Shi, JP;
Abstract
The purpose of the present invention is to improve responsiveness to short-circuit detection and rapidly cut off power supply to a load when a short circuit occurs. When a short circuit occurs, voltage exceeding the reference voltage of a comparison circuit is inputted as an input signal from a voltage output circuit, and a high signal is outputted from the comparison circuit. An FET is turned on by the output of the comparison circuit changing to the high signal. Consequently, an electric charge stored between the gate and emitter of an IGBT is discharged through a resistor, gate voltage decreases, and thereby the IGBT is turned off. The high signal of the comparison signal is held for a predetermined period by a holding circuit, and the IGBT is maintained in the off state over this period.