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:
Feb. 03, 2004
Filed:
Aug. 15, 2001
Daniel Lopez, Villingen-Schwenningen, DE;
Jean Paul Louvel, Villingen-Schwenningen, DE;
Thomson Licensing S.A., Boulogne, FR;
Abstract
The battery-operated power supply unit, which comprises a switching transistor whose current terminals are connected in series with a battery, in the current path of the power supply unit, comprises a protective circuit, which is arranged across the current terminals of the switching transistor and evaluates the differential voltage across the switching transistor. The switching transistor is in particular a MOSFET with a parallel-connected internal diode. In the event of too high a differential voltage, the power supply unit or an appliance connected downstream is switched off, so that the switching transistor is not destroyed in the event of a fault. The protective circuit contains, in particular, a threshold circuit with a transistor whose base and emitter are connected across the current terminals of the switching transistor and whose base bias voltage is set via a voltage divider in such a way that, in the event of too high a differential voltage, the transistor switches on and, in this way, triggers a turn-off signal via the collector.