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. 07, 1995
Filed:
Nov. 23, 1993
Toru Housen, Nagano, JP;
Manabu Watanabe, Nagano, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
By disposing various current-sensing layers on a semiconductor element with a current-sensing function, wherein signals corresponding to the sensing currents derived from each current-sensing electrode are inputted independently into said over-current control circuit and short-circuit control circuit in a control circuit for said semiconductor element; or by constructing the current-sensing resistor in said control circuit with various resistors connected in series, wherein a single sensing current flows into this resistor to generate various detection voltages divided by the resistor, while detection voltages with different values are inputted independently into said main current turn-off command circuit and main current control circuit the value I.sub.oc of the over-current detection level for the semiconductor element with a current-sensing function and the value I.sub.sct at the short-circuit current detection level can be set independently of each other. Therefore, while increasing I.sub.oc, setting I.sub.sct within a short-circuit current withstand capacity of the semiconductor element, and extending the upper limit in the main current of said semiconductor element, it is possible to avoid element break-down due to a short-circuit current.