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:
Nov. 22, 2011
Filed:
Sep. 18, 2007
Rune Thomsen, Loegumkloster, DK;
Rune Thomsen, Loegumkloster, DK;
Secop GmbH, Flensburg, DE;
Abstract
An electric circuit for supplying power to a DC application is disclosed. The electric circuit comprises a DC power source () connectable to an alternator charging circuit (), an FET (T), and a capacitor () connected across the gate terminal and the source terminal of the FET (T). The drain terminal of the FET (T) is connected to a negative terminal of the DC source (). The FET (T) protects the circuit against accidental connection of the alternator charging circuit () to the DC power source () with reversed polarity, by opening a switch () of the FET (T) when this occurs. The capacitor () protects the FET (T) from being pushed into avalanche in case a load-dump transient occurs. This is because the capacitor () in this case will charge and discharge, thereby introducing a time delay before the switch () is opened. Protection against load-dump transients is thereby obtained by means of a small component with low energy dissipation. Thereby the size of the circuit is reduced and energy is conserved.