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. 26, 2013
Filed:
Jan. 09, 2009
Hideaki Emoto, Tokyo, JP;
Hideaki Emoto, Tokyo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A device for diagnosing operation status of an external control unit includes an insulation transformer, a signal generating unit, a first switch circuit constituting the external control unit connected to the secondary side of the insulation transformer, a second switch circuit connected to the intermediate tap of the primary winding of the insulation transformer, and a second switch circuit including a switch and a resistance, a detection circuit for detecting operation status of the external control unit, and a current measuring unit connected to the second switch circuit. The detection circuit includes a diode and a resistance and is connected to the secondary side of the insulation transformer. The current measuring unit measures a current flowing through the switch and/or the resistance and uses the measured current to diagnose the operation status of the external control unit.