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Title:
SWITCHING POWER SUPPLY
Document Type and Number:
Japanese Patent JP2005051918
Kind Code:
A
Abstract:

To protect the circuitry of a current resonance power supply by turning a switching element on/off if a commutation current flows through a commutation diode connected in reverse parallel with the switching element when switching frequency is varied abruptly thereby preventing a through current from flowing into the switching element.

In a current resonance converter, an I/V conversion circuit 51 and a current state detection circuit 52 detect the state where a commutation current flows through commutation diodes D1 and D2 connected in reverse parallel with switching elements Q1 and Q2 as the state of a current flowing to the primary side through switching operation. When a commutation current is flowing through the commutation diodes D1 and D2, a drive signal waveform for not turning the switching elements Q1 and Q2 on/off is obtained based on the detection results.


Inventors:
TAKAHAMA MASANOBU
Application Number:
JP2003000281203
Publication Date:
February 24, 2005
Filing Date:
July 28, 2003
Export Citation:
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Assignee:
SONY CORP
International Classes:
H02M3/28; (IPC1-7): H02M3/28
Attorney, Agent or Firm:
脇 篤夫
鈴木 伸夫



 
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