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:
Apr. 25, 2000
Filed:
Mar. 18, 1998
Applicant:
Inventor:
Uffe Noe Christiansen, Hadsten, DK;
Assignee:
Carlo Gavazzi AG, Steinhausen, CH;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
327438 ; 327453 ;
Abstract
A solid state relay includes a power semiconductor controlled by a gate electrode. A current detector provides a signal which is a function of the absolute value of the current through the power semiconductor. An evaluation circuit coupled to the current detector receives the current signal. The current detector may include a ferromagnetic core surrounding a conductor coupled to the power semiconductor, a coil wound around the core, and an oscillator generating a carrier signal and a detection circuit, both coupled to the core. The current detector is used to control latching of the relay and to generate status signals if predetermined parameters are exceeded.