Switching power supply device

Patent metadata

Field	Value
Publication number	US-9048741-B2
Application number	US-201414252862-A
Country	US
Kind code	B2
Filing date	Apr 15, 2014
Priority date	Oct 21, 2011
Publication date	Jun 2, 2015
Grant date	Jun 2, 2015

Abstract

A primary side resonant circuit is formed by a primary side resonant inductor and a primary side resonant capacitor, and secondary side resonant circuits are formed by secondary side resonant inductors and secondary side resonant capacitors. Equivalent mutual inductances and equivalent mutual capacitances are formed through electromagnetic field resonant coupling between a primary winding and secondary windings, and a multi-resonant circuit including an LC resonant circuit formed in each of the primary side and the secondary side is formed. Electric power is transmitted from the primary side circuit to the secondary side circuit, and resonant energy that is not transmitted from the primary winding and, of energy which the secondary winding has received, resonant energy that is not supplied to an output are each retained in the multi-resonant circuit.

First claim

The invention claimed is:

1. A switching power supply device, comprising:
a transformer including at least a primary winding and a secondary winding;
a primary side circuit including
a primary side resonant inductor formed so as to be equivalent to and in series with the primary winding,
a primary side resonant capacitor forming, together with the primary side resonant inductor, a primary side resonant circuit, and
a primary side alternating current voltage generation circu…

Assignees

• Murata Manufacturing Co

Inventors

• Hosotani Tatsuya

Classifications

• H02M3/33507 Primary

  Electricity · mapped topic

• H02M3/33576

  Electricity · mapped topic

• H02M7/4826

  Electricity · mapped topic

• H02M3/33523

  Electricity · mapped topic

• H02M3/28 Primary

  Electricity · mapped topic