Low power consumption current transducer

Details Low power consumption current transducer Low power consumption current transducer

1987-12-15

1989-04-18

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 330 8, G01R 120

Patent

active

048230740

ABSTRACT:
A low power consumption current transducer utilizes a saturable core reactor which includes a pair of opposed gate windings and a control winding. The control winding of the saturable reactor is arranged to receive the current to be measured. A square wave generator is connected to the gate windings via a transformer with the primary winding of the transformer connected across the square wave generator and the secondary connected in series with the gate windings of the reactor. A full wave rectifier is connected to the gate windings and a resistor is connected across the rectifier to provide a DC voltage thereacross representative of the current flow through the control winding. A DC power supply is provided to supply power to the square wave voltage source. A diode is connected between each end of the primary winding of the transformer and one polarity of the DC power supply to commutate the reactive current resulting from the counter emf generated in the reactor back to the DC supply to eliminate potentially damaging reactive voltage spikes which would otherwise appear at the output of the square wave generator and conserve energy.

REFERENCES:
patent: 3422352 (1969-01-01), Paulkovich
patent: 3959695 (1976-05-01), Shimp
patent: 4152744 (1979-05-01), Pang
patent: 4271462 (1981-06-01), Peters

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