Patent ID: 11923760
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switching power supply apparatus comprising:
a switching circuit, a transformer; and a conductor portion, the switching circuit including a plurality of switching elements that form a bridge circuit,
wherein the switching circuit has first and second output terminals from which an AC voltage having a predetermined frequency is outputted, the AC voltage being converted from an inputted DC voltage,
wherein the transformer has a primary winding having first and second winding terminals to which the AC voltage generated by the switching circuit is applied,
wherein the switching power supply apparatus has a first line-to-ground capacitance between the first winding terminal of the transformer and the conductor portion, and a second line-to-ground capacitance between the second winding terminal of the transformer and the conductor portion,
wherein the switching power supply apparatus further comprises first and second capacitors, the first capacitor being connected between the first output terminal of the switching circuit and the first winding terminal of the transformer, and the second capacitor being connected between the second output terminal of the switching circuit and the second winding terminal of the transformer,
wherein capacitances of the first and the second capacitors are set to satisfy:
C21>C22, for C31>C32; and
C21<C22, for C31<C32, and

wherein C31 denotes the first line-to-ground capacitance, C32 denotes the second line-to-ground capacitance, C21 denotes capacitance of the first capacitor, and C22 denotes capacitance of the second capacitor.