Patent · US Expired

Apparatus for triggering a DC motor with a protective circuit preventing substrate currents

US5903121A · kind A · utility

12Cited by

9References

2Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Martin Heine · Troy, US
Alfons Fisch · Rockenhausen, DE
Theodor Maier · Aiglsbach, DE
Gerhard Goeser · Pentling, DE

Key dates

Filing date	Feb 18, 1997
Grant date	May 11, 1999
Priority date	—
Expiry date	Feb 18, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH02H7/0838
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In a method for triggering a DC motor through an integrated H-bridge circuit by using a control circuit and an apparatus for carrying out the method, a high-side transistor switch or a low-side transistor switch associated with each motor terminal, or both of the transistor switches, are each controlled or regulated to a conductive state by a respective guard circuit, if and as long as a potential at a motor terminal is or falls below a predetermined value. Each guard circuit has a biased transistor with a conductive state in which the associated transistor switches are made conducting through a current mirror.

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