Patent · US Expired

Monolithically integrated, polarity-reversal protected circuit

US4689711A · kind A · utility

5Cited by

8References

2Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Conzelmann · Echterdingen, DE
Karl Nagel · Gomaringen, DE

Key dates

Filing date	Nov 4, 1985
Grant date	Aug 25, 1987
Priority date	—
Expiry date	Nov 4, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH02H11/002
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A monolithically integrated, polarity-reversal protected switching circuit includes, in the output of a switching stage, a symmetrical thyristor instead of an otherwise customary diode. This thyristor is constituted by an npn transistor and a lateral pnp transistor. The control input of the thyristor is controlled by an additional control arrangement in such a manner that the thyristor is switched off at the occurrence of high voltage peaks. In this manner, there is obtained a relatively inexpensive monolithically integrated switching arrangement which is protected against polarity reversal and withstands voltage pulses of up to 150 volts.

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