Patent · US Expired

Method and circuit arrangement for protecting an electric motor from an overload

US7123458B2 · kind B2 · utility

53Cited by

5References

20Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Thomas Mohr · Babenhausen, DE
Norbert Knab · Appenweier, DE
Albert Eisele · Achern, DE
Juergen Rapp · Achern, DE

Key dates

Filing date	Sep 24, 2002
Grant date	Oct 17, 2006
Priority date	—
Expiry date	Mar 26, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH02H7/0833
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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 (Us1, Us2) is defined; when it is exceeded, the power supplied to the motor is reduced or switched off.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.