Impedance Limit Switch For Reducing EMC Radiation
AssigneeVEGA Grieshaber KG
InventorsDominik Fehrenbach, Juergen Haas, Christian Weinzierle, Volker Allgaier
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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.
Claims10
An impedance limit switch, configured to determine a limit level of a medium, comprising:
- a measuring probe having an oscillator circuit;
- and
- an electronic circuit configured to generate an excitation signal for the oscillator circuit,
- wherein the electronic circuit is further configured to sweep a frequency of the excitation signal and determine a resonance curve of the oscillator circuit and
- wherein 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 impedance limit switch.
A method for determining a limit level of a medium using an impedance limit switch, comprising:
- generating an excitation signal for an oscillator circuit;
- sweeping a frequency of the excitation signal;
- determining a resonance curve of the oscillator circuit;
- adapting an amplitude of the excitation signal dependent upon the resonance curve in order to reduce an EMC radiation of the impedance limit switch.
A program element which, when it is executed on a processor of an impedance limit switch, instructs the impedance limit switch to carry out the following steps:
- generating an excitation signal for an oscillator circuit;
- sweeping a frequency of the excitation signal;
- determining a resonance curve of the oscillator circuit;
- adapting an amplitude of the excitation signal dependent upon the resonance curve in order to reduce an EMC radiation of the impedance limit switch.
Dependencies are inferred from the claim text.