Patent ID: 7586759
Filing Date: 2009-09-08
Classification: H02M

Abstract:
1. A power source apparatus, comprising: first and second transformers, wherein the primary windings of said first and second transformers are connected in series with a power source; first to third switching elements connected to the primary windings of said first and second transformers; a capacitor connected to the primary windings of said first and second transformers; a first rectifying element connected to the secondary winding of said first transformer; a second rectifying element connected to the secondary winding of said second transformer; and a control unit for controlling an operation of said first to third switching elements; wherein said control unit, in a first period, controls electric currents flowing in the primary windings of said first and second transformers so that electric currents generated in the secondary windings of said first and second transformers are supplied to a load via said first and second rectifying elements by switching said second and third switching elements ON; in a second period, controls the electric currents flowing in the primary windings of said first and second transformers so that the electric current generated in the secondary winding of said first transformer is supplied to the load via said first rectifying element by switching said first and second switching elements ON; in a third period, controls the electric currents flowing in the primary windings of said first and second transformers so that the electric currents generated in the secondary windings of said first and second transformers are supplied to the load via said first and second rectifying elements by switching said second and third switching elements ON; and in a fourth period, controls the electric currents flowing in the primary windings of said first and second transformers so that the electric current generated in the secondary winding of said second transformer is supplied to the load via said second rectifying element by switching said first and third switching elements ON.