Patent ID: 6900557

Claim:
A modulator comprising: a transformer comprising a primary winding and a plurality of secondary windings; a control driver for producing electrical control signals, said control driver being in electrical communication with said primary winding and being in electrical communication with a source of electrical power; and a plurality of switches, each switch having an input terminal pair and at least one output terminal pair, said input terminal pair being in electrical communication with a respective said transformer secondary winding, and each switch having an input voltage limiting device in parallel with said input terminal pair, said input voltage limiting device providing a common defined voltage to each said switch; wherein the plurality of switches are substantially simultaneously switched on by a time varying electrical control on-pulse and maintained in an on state for a predetermined extended length of time by a plurality of time varying electrical control on-pulses produced by said control driver, said on-pulse being substantially of a first polarity, and wherein the plurality of switches are substantially simultaneously switched off by a time varying electrical control off-pulse and maintained in an off state for a predetermined extended length of time by a plurality of time varying electrical control off-pulses produced by said control driver circuit, said off-pulse being substantially of a second polarity, said second polarity being opposite to said first polarity.