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:
Aug. 12, 2014
Filed:
Jun. 17, 2010
Hiroshi Nakatake, Tokyo, JP;
Hiroshi Nakatake, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
In a semiconductor device utilizing a power semiconductor element provided with a main cell and a current sensing cell, a load overcurrent is accurately detected and a short circuit current is rapidly detected. The output of a current sensing cell is connected to an inverting input terminal of an operational amplifier, and a non-inverting input terminal of the operational amplifier is connected to the source of the main cell. A current/voltage conversion circuit configured with the operational amplifier and a sensing resistor converts an output current of the current sensing cell into a sensing voltage. A first error detection circuit compares the sensing voltage with a first reference voltage and outputs an error signal. A second error detection circuit compares a voltage at the inverting input terminal of the operational amplifier with a second reference voltage set to be higher than a source-bias voltage and outputs an error signal.