Power Console For A Surgical Tool That Includes A Transformer With An Integrated Current Source For Producing A Matched Current To Offset The Parasitic Current

A control console for supplying a drive signal to the power generating unit of a surgical tool, said console including:

• a transformer with a primary winding across which an AC voltage is applied;
• and a secondary winding across which a drive signal is induced so the drive signal can be applied to the power generating unit of the surgical tool;
• a matched current source comprising a leakage control winding across which the AC signal that is present across the primary winding induces a voltage and a capacitor connected between the leakage control winding and the transformer secondary winding, the match current designed to produce a current that at least partially cancels a leakage current present in the drive signal applied to the surgical tool as a result of parasitic capacitance,
• the leakage control winding is internal to the transformer and includes a plurality of sub-windings;
• and
• a switch array selectively connects one or a plurality of the sub-windings between the capacitor and ground to form the leakage control winding so that by setting said switch array, for a given voltage across the transformer primary winding, the voltage that develops across the leakage control winding is selectively set.