Patent · US Active

Impedance limit switch for reducing EMC radiation

US11353355B2 · kind B2 · utility

0Cited by

3References

10Claims

0Family size

Assignee

VEGA Grieshaber KG · DE

Inventors

Dominik Fehrenbach · Rottweil, DE
Juergen Haas · Knittlingen, DE
Christian Weinzierle · Wolfach, DE
Volker Allgaier · Lenzkirch, DE

Key dates

Filing date	Mar 13, 2019
Grant date	Jun 7, 2022
Priority date	—
Expiry date	Nov 27, 2040

Classification

Technology area (CPC H)Electricity
CPC primaryH01H47/002
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An impedance limit switch is configured to determine a limit level of a medium. The switch may include a measuring probe having an oscillator circuit; and an electronic circuit configured to generate an excitation signal for the oscillator circuit. The electronic circuit is further configured to sweep a frequency of the excitation signal and determine a resonance curve of the oscillator circuit. The electronic circuit is further configured to adapt an amplitude of the excitation signal dependent upon the resonance curve in order to reduce an EMC radiation of the switch.

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