Title:
スイッチング電源装置
Document Type and Number:
Japanese Patent JP5448813
Kind Code:
B2
Abstract:
An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a load current value detected by detection resistors R7 and R8 is compared with a reference voltage by an input-side transistor Q4 and an output-side transistor Q3 which compose a first current mirror circuit 14, so that it is possible to determine whether an overcurrent occurs or not. Moreover, a current passing through the output circuit of the transistor Q3 is temperature-compensated by a second current mirror circuit 17 made up of transistors Q6 and Q5.
Inventors:
Nishihara Tsugu foundation
Akiyuki Komatsu
Akiyuki Komatsu
Application Number:
JP2009516173A
Publication Date:
March 19, 2014
Filing Date:
May 19, 2008
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H02M3/28; G05F3/26
Domestic Patent References:
| JPH07248342A | 1995-09-26 | |||
| JPH0937547A | 1997-02-07 | |||
| JPH0272678U | 1990-06-04 |
Attorney, Agent or Firm:
Yohei Harada