Device for generating analog current or voltage signal
AssigneeABB AB
InventorErkki MIETTINEN
Life of this patent
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Abstract
In a device, such as measuring or control signal transmitter, generating an analog current or voltage output signal, absolute values of output variables are continuously measured and regulated to ensure the correctness of the signal. The actual current or voltage value of an analog output signal is measured and digitized (206), a difference (e) between the digitized actual current or voltage value and the desired current or voltage value is defined (300), and the generation (200, 202, 204, 205) of the analog output signal is controlled (304) by means of a digital control signal (Enable, Direction) so as to decrease the difference.
Claims20
A device, especially a measuring or control signal transmitter, for generating an analog current or voltage signal, the device comprising
- first means for generating an analog current or voltage output signal in response to a digital control signal,
- second means for measuring and digitizing an actual current or voltage value of an analog output signal
- third means for determining a difference between said digitized actual current or voltage value and the desired current or voltage value of the analog output signal and for controlling the first means by using a digital control signal in such a manner that the difference decreases.
Dependencies are inferred from the claim text.