Title:
INSULATING SYNCHRONOUS RECTIFICATION TYPE DC/DC CONVERTER, POWER SUPPLY USING THE SAME, POWER ADAPTER AND ELECTRONIC APPARATUS
Document Type and Number:
Japanese Patent JP2017034812
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a DC/DC converter capable of supplying power to a secondary side controller, without using an auxiliary winding of the secondary side of the transformer.SOLUTION: On the secondary side of an insulating synchronous rectification type DC/DC converter 200, there are provided a first capacitor C1 and an auxiliary power supply 400 in addition to a synchronous rectification transistor M2 and a secondary side controller 300. One end of the first capacitor C1 is connected to a first node N1 which connects the synchronous rectification transistor M2 to a secondary winding W2. The auxiliary power supply 400 charges the first capacitor C1 with a voltage Vof an output line 212, and also stabilizes a voltage between both ends of the first capacitor C1. A grounding voltage of the secondary side controller 300 is obtained from the first node N1, and a power voltage of the secondary side controller 300 is obtained from another end of the first capacitor C1.SELECTED DRAWING: Figure 2
Inventors:
KIKUCHI HIROMOTO
SHIMIZU AKIRA
SHIMIZU AKIRA
Application Number:
JP2015151194A
Publication Date:
February 09, 2017
Filing Date:
July 30, 2015
Export Citation:
Assignee:
ROHM CO LTD
International Classes:
H02M3/28
Domestic Patent References:
| JPH07308065A | 1995-11-21 | |||
| JP2002281749A | 2002-09-27 | |||
| JP2014138458A | 2014-07-28 |
Foreign References:
| US20140268915A1 | 2014-09-18 |
Attorney, Agent or Firm:
Sakaki Morishita
Masaki Taiki
Masaki Taiki