Importance

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Abstract

A switching current supply circuit, in response to a control voltage, controls the current flowing in an inductive load. Included is a pair of terminals adapted for connection to such a load and a bridge network connected to the terminals for producing a voltage indicative of the current flowing through the load. A comparator switches an output voltage between two distinct values in response to a differential input voltage having components derived, at least in part from the control voltage and the load-current-indicating voltage. Finally, a polarity-changeable voltage source, in response to the output voltage, applies, selectively and reversibly, known voltages of opposite polarity through the bridge network to the load-connectable terminals. These known voltages effect a change in load current level appropriate to decrease the absolute value of the above-mentioned input voltage. Optionally, this circuit also includes an adjustable hysteresis circuit connected to the comparator for delaying switching therein by a known period of time. The circuit may also be constructed to minimize common mode voltage.

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