Methods and devices for AC current sources, precision current transducers and detectors
AssigneeGuildline Instruments Limited
InventorsPetar Miljanic, Tomasz Barczyk
Life of this patent
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Abstract
Precision AC voltage, current, phase, power and energy measurements and calibrations with current ranges from 1 uA to 20 kA and voltage ranges from 1V to 1000 kV are now performed with accuracies of better than one part per million. Continued demand for improved accuracy has led the inventors to address improvements to dual stage and multi-stage current transducers that may form the basis of the measuring process within many of the measurement instruments providing the precision AC measurements and calibrations. Additionally, the improvements to dual stage and multi-stage current transducers provide for novel feedback controlled precision AC current sources without requiring measurement of the AC current source output directly.
Claims14
A current source comprising:
- a dual stage current transducer comprising at least a primary winding, a first secondary winding and a second secondary winding;
- an alternating current source disposed between the first secondary winding and a processing circuit for generating a current to generate a first electrical output signal across the primary winding to be coupled to a load;
- a processing circuit coupled to the first secondary winding and the second secondary winding for providing a second electrical output signal relating to the current generated by the alternating current source to an external circuit.
A method of providing a current source comprising:
- providing a dual stage current transducer comprising at least a primary winding, a first secondary winding and a second secondary winding;
- providing an alternating current source disposed between the first secondary winding and a processing circuit for generating a current to generate a first electrical output signal across the primary winding to be coupled to a load;
- providing a processing circuit coupled to the first secondary winding and the second secondary winding for providing a second electrical output signal relating to the current generated by the alternating current source to an external circuit.
Dependencies are inferred from the claim text.