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:
Sep. 21, 1999
Filed:
Sep. 30, 1997
Helmut Lenz, Oberasbach, DE;
Walter Burger, Nurenberg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A device for monitoring chip temperature of a switch output stage having a switch element (100, 106) that has a first circuit (10) for generating a signal (pv.sub.on) corresponding to the dissipated power of the switch element (100-106) during an on state. The device has a second circuit (20) for generating a signal (pv.sub.1, pv.sub.2 ; pv'.sub.1) corresponding to the dissipated power of the switch element (100-106) during a turn-on and/or turn-off event. The device further has a summer (40) that sums the signals (pv.sub.on, pv.sub.1, pv.sub.2 ; pv.sub.on pv'.sub.1) of the first and second circuits (10, 20) in weighted fashion and outputs a sum signal (pv.sub.sum) corresponding to the dissipated power of the switch element (100-106). The device also has an integrator (60) that responds to the sum signal (pv.sub.sum) and outputs an output signal (th) corresponding to the chip temperature of the switch element (100-106). Such a device is suitable for temperature monitoring in realtime at switch output stages having variable switching frequency.