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:
Nov. 08, 2005
Filed:
Aug. 12, 2003
Yutaka Ikeda, Yokaichi, JP;
Yutaka Ikeda, Yokaichi, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A semiconductor switching element performs operations of bringing a current path from a power supply to a load into conduction and interrupting the path and is controlled by an operating-mode control circuit so as to operate in a first operating mode in which a conductive operation is shifted to an interrupt operation by using a change in resistance of a first positive-temperature-coefficient thermistor when the temperature of a temperature detection portion increases and reaches a predetermined interrupt temperature, and to be in a second operating mode in which the interrupt operation is shifted to the conductive operation by using a change in resistance of a second positive-temperature-coefficient thermistor when the temperature of the temperature detection portion decreases and reaches a return temperature, which is lower than the interrupt temperature by a predetermined value. Each operating mode is controlled in the state where both positive-temperature-coefficient thermistors are thermally coupled to the temperature detection portion.