Patent ID: 7426119
Filing Date: 2008-09-16
Classification: H02M,Y02B

Abstract:
1. A switching power supply apparatus including a conversion circuit turning ON/OFF DC voltage of a DC power supply to supply the DC voltage to a primary winding of a converter transformer and outputting voltage which is symmetric in terms of positive and negative from a secondary winding of the converter transformer, comprising: a first smoothing transformer including a second smoothing transformer including a reactor connected to both ends of a series circuit to which the secondary winding of the first smoothing transformer and the secondary winding of the second smoothing transformer are serially connected; a smoothing capacitor, one end thereof being electrically connected to the second end of the primary winding of the first smoothing transformer and to the second end of the primary winding of the second smoothing transformer; a first diode connected to a connection of the first winding and the second winding of the first smoothing transformer and to the other end of the smoothing capacitor; and a second diode connected to a connection of the first winding and the second winding of the second smoothing transformer and to the other end of the smoothing capacitor.