Patent · US Expired

Active free-running element

US5430366A · kind A · utility

9Cited by

6References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Ricardo Erckert · Bad Aibling, DE
Michael Lenz · Zorneding, DE

Key dates

Filing date	May 14, 1993
Grant date	Jul 4, 1995
Priority date	—
Expiry date	May 14, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B70/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A switching regulator includes an inductive load. A monolithically integrated active free-running element includes an npn transistor switching the inductive load to generate a free-running current carried by the transistor. The transistor has a base terminal and collector and emitter terminals defining a collector-to-emitter voltage. A drive circuit has an output terminal connected to the base terminal of the transistor to trigger the transistor for operating the transistor largely into the saturation range, whenever the collector-to-emitter voltage of the transistor is positive.

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