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:
Dec. 21, 1999
Filed:
Apr. 27, 1998
Takaaki Izawa, Shizuoka, JP;
Tsuyoshi Uchikura, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
An overheat protection device 10 that can perform the immediate resetting of the power cutoff control state or the power limit control state when the overheat state of the drive circuit (power MOSFET) is eliminated. A semiconductor switching apparatus and an intelligent power module 30 are also provided which use the overheat protection device 10. The overheat protection device 10 monitors the energized state of the drive circuit that drives the load 32; when it detects the overheat state of the drive circuit during the energized state, resets the energized state to limit or stop the driving of the load 32; holds the power limit control state or the power cutoff control state and monitors the overheat state in synchronism with the timing signal 102b having a predetermined cycle; and, when the absence of the overheat state is detected during the monitoring, generates the gate control signal 108a to reset the power limit control state or the power cutoff control state.