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Time：2022-04-13Views：0
1. How to choose the current and voltage sensor power supply?
Closed-loop sensors require special attention when selecting a power supply. For current or voltage sensors based on the closed-loop principle, the current loss IC can be divided into two parts, one part is the internal fixed loss of the sensor, and the other part is the output loss caused by the measured current or voltage. (IS). The second part can be calculated as follows:
A. For current sensor: IS output current = primary peak current × transformation ratio
B. For voltage sensor: IS output current = (primary peak voltage/primary resistance) × transformation ratio
2. How does the current sensor work when there is only a single power supply?
Most closed loop sensors require the use of a bipolar power supply (eg ±15V). However, many sensors can also operate from a unipolar supply if only unidirectional current is measured. At this point, the following points must be considered (solution is not valid for DV and DVL family):
The power supply voltage should be equal to the sum of the positive and negative voltages indicated in the specification (eg ±15V sensor should use +30V power supply).
The selection of measurement resistance and maximum operating current should not make the sensor output power dissipation too large (please contact Lime for the correct measurement resistance range).
The output stage is designed for bipolar supply conditions where diodes must be placed in series with the output to achieve minimum output bias voltage rather than creating a zero offset
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