Patent ID: 6903946

Claim:
An electrical apparatus for powering a load, said electrical apparatus comprising: a source of pulsating direct voltage; a first plurality of power factor correcting AC-to-DC switching converters units, each including first and second input ports coupled to said source of pulsating direct voltage, and each also including first and second output ports, each of said power factor correcting AC-to-DC switching converter units being for converting said pulsating direct voltage into a direct voltage at said first and second output terminals, and for tending to maintain the current through said source of pulsating direct voltage in-phase with said pulsating direct voltage, each of said power factor correcting AC-to-DC switching converter units further including first unidirectional current conducting means associated with said first output port for resisting retrograde flow of current at said first output port; a plurality equal to said first plurality of current sharing controllers, each of which includes an input terminal coupled to said first output terminal of one of said power factor correcting AC-to-DC switching converter units, a reference port in common with all said current sharing controllers, and an output port in common with all output ports of said current sharing controllers; and an output return current equalizing impedance associated with said second output terminal of each of said power factor correcting AC-to-DC switching converter units, said equalizing impedance comprising second unidirectional current conducting means poled for resisting forward flow of current at the associated first output port.