Patent · US Expired

Circuit arrangement for limiting the current at make of a capacitative load

US5994889A · kind A · utility

3Cited by

1References

3Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Hugo Goller · Munich, DE
Klaus Hoffmann · Bad Tölz, DE

Key dates

Filing date	Dec 2, 1998
Grant date	Nov 30, 1999
Priority date	—
Expiry date	Dec 2, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S323/901
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement for limiting the current at make which includes hot-carrier thermistors that see to a reduction of the current flow at make. Only when a further hot-carrier thermistor has been adequately heated by the flow of current are the hot-carrier thermistors bridged, and the capacitative load receives the full operating voltage. After turn-off, an ambient temperature-compensated voltage divider at the base of a transistor prevents the immediate re-activation until the further hot-carrier thermistor and, thus, all hot-carrier thermistors, have adequately cooled.

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