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. 11, 2003
Filed:
Jul. 10, 2000
Wolfgang Gudat, Seelze, DE;
Wabco GmbH & Co. OHG, Hannover, DE;
Abstract
A circuit arrangement for operating a solenoid actuator, for example, an electric motor provided in the form of a switched reluctance motor, permits operation of the motor in the event of malfunction or failure of part of an energy supply. The circuit arrangement advantageously includes an auxiliary battery serving as a redundance in addition to a main battery. The auxiliary battery is smaller and has a lower nominal voltage than the main battery. In order to permit continued operation of the electric motor in the event of failure, with a nominal operating voltage which is adapted to the nominal voltage of the main battery, a capacitor which can be switched on and off is connected in series to the batteries. An energy quantity can be accumulated in the capacitor by switching the current switching through an exciter winding of the electric motor in the manner of a switching regulator, whereby the nominal voltage of the capacitor finally exceeds the voltage in the auxiliary battery. When a sufficient quantity of energy has been accumulated, the electric motor can be actuated for a short time by means of the energy accumulated in the capacitor. Electrically actuated braking systems in commercial vehicles represent a significant and preferred area of application for the invention.