Patent · US Expired

Control input circuit for an electrical device

US7405550B2 · kind B2 · utility

1Cited by

10References

21Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Walter Apfelbacher · Freihung, DE
Norbert Reichenbach · Amberg, DE
Johann Seitz · Amberg, DE

Key dates

Filing date	Mar 30, 2004
Grant date	Jul 29, 2008
Priority date	—
Expiry date	Jan 13, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH03K17/13
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A control input of an electrical device is disclosed, which is resistant to parasitic currents and which is especially suitable for a large bandwidth of various driving voltages. For this purpose, a control input circuit includes a constant current sink connected to a control line, whose current consumption during the duration of the detection pulse assumes a detection value relative which the power consumption between two successive detection pulses is reduced. The circuit also includes an evaluation module that analyzes the input current flowing in the control line and that indicates a control signal if, during the detection pulse, the input current does not fall below a predetermined switch-on value for a predetermined duty cycle.

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