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:
Oct. 17, 2006
Filed:
Sep. 24, 2002
Thomas Mohr, Buehlertal, DE;
Norbert Knab, Appenweier, DE;
Albert Eisele, Achern, DE;
Juergen Rapp, Waldbronn, DE;
Thomas Mohr, Buehlertal, DE;
Norbert Knab, Appenweier, DE;
Albert Eisele, Achern, DE;
Juergen Rapp, Waldbronn, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method and a circuit for protecting an electric motor and/or its trigger circuit against overload in the emergency-operation mode in a motor vehicle direct-current fan motor operated by means of pulse width modulation, in which the trigger circuit is designed as an emergency-operation controller, with a microcontroller preceding the motor end stage and with a comparator assembly for detecting overvoltages. Overload protection is assured at elevated battery voltage and at the same time when the emergency-operation controller is activated in response to malfunctions in the normal triggering of the electric motor. To that end, at least one overvoltage threshold (U, U) is defined; when it is exceeded, the power supplied to the motor is reduced or switched off.