Title:
SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2016063733
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent a continuance of a self-oscillation generated when a main switching element is turned off in a state where there is a voltage in a high-voltage side output terminal.SOLUTION: A switching power supply comprising a rectifier circuit of a synchronous rectification type, includes: a rectification switch Q3 that is serially connected to a secondary main winding Ns1 of a main transformer T1 and turns-on in synchronization with ON of the main switch Q1; and a translocation switch Q4 that is connected to the secondary main winding Ns1 in parallel and turns-o in synchronization with OFF of the main switch Q1. The switching power supply further comprises: rectification elements CR1 and CR2, and transistors Q5 and Q6 that construct an auxiliary switch circuit turning-off the translocation switch Q4 for preventing a continuance of self-oscillation when the stop of the main switch Q1 in a state where there is a voltage Vout is in a high-voltage side output terminal +Vout.SELECTED DRAWING: Figure 4
Inventors:
WANG YUEQING
WANG HONGLEI
WANG HONGLEI
Application Number:
JP2015028135A
Publication Date:
April 25, 2016
Filing Date:
February 17, 2015
Export Citation:
Assignee:
TDK CORP
International Classes:
H02M3/28
Domestic Patent References:
| JP2010154626A | 2010-07-08 | |||
| JP2008178177A | 2008-07-31 | |||
| JP2004274824A | 2004-09-30 | |||
| JP2002291241A | 2002-10-04 | |||
| JP2004015886A | 2004-01-15 |
Foreign References:
| US20040174721A1 | 2004-09-09 |
Attorney, Agent or Firm:
Shinji Sakai