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:
May. 14, 2019
Filed:
Feb. 02, 2015
Mitsubishi Heavy Industries Thermal Systems, Ltd., Minato-ku, Tokyo, JP;
Abstract
The on-state malfunction detection device detects an on-state malfunction, for instance, in an IGBT that is provided to correspond to a PTC element whose electrical resistance value varies according to temperature and that controls the electrification of the PTC element. In a state in which a turn-off instruction has been outputted from a control device to the IGBT, the on-state malfunction detection device determines through calculation an electric potential difference following voltage division of the voltage between the both ends of the PTC element, and detects an on-state malfunction of the IGBT when this electric potential difference is equal to or greater than a predetermined threshold value. This allows for the detection of an on-state malfunction in a switching element that performs an electrical conduction control for an element whose electrical resistance value varies according to temperature.