Patent · US Expired

Control circuit for a dc motor

US6321031A · kind A · utility

5Cited by

15References

4Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Thomas Mohr · Babenhausen, DE
Karl-Heinrich Preis · Bühlertal, DE
Wolfgang Schwenk · Oberkirch, DE
Robert Kern · Indianapolis, US

Key dates

Filing date	Jun 2, 1999
Grant date	Nov 20, 2001
Priority date	—
Expiry date	Jun 2, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH02H11/003
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A control circuit for a direct-current motor driven in a clocked manner, includes an electrolytic capacitor connected in parallel and free-wheeling diode. Spurious radiation is reduced, in that a choke is connected between the positive motor supply voltage and the plus terminal of the electrolytic capacitor, and that the free-wheeling diode is disposed with its cathode between the choke and the electrolytic capacitor, and with its anode on the negative side of the d.c. motor.

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