AN IMPROVED SWITCHING POWER SUPPLY METHOD AND APPARATUS FOR EFFICIENT PARALLEL CONNECTION OF THE IMPROVEDPOWER-SUPPLIES

摘要

A method for connecting in parallel of one or more switching power supplies via a common output power bus. Each switching power-supply has an input stage, connected to the primary winding of a transformer, and an output stage, connected to the secondary winding of the transformer and to the power bus, The output stage comprises a first and a second controllable main switches with low on-state impedance, for synchronous current rectification in the output stage. The control input of each of the controllable main switches is controlled by a corresponding auxiliary controllable switch connected between a contact of the secondary winding of the transformer and the control input of the main switch, thereby enabling the control of the auxiliary controllable switches by signals induced in the secondary winding by the primary winding, and thereby disconnecting the control input of each of the main switches from the output power bus.