Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
POWER SUPPLY SYSTEM
Document Type and Number:
Japanese Patent JP2009290950
Kind Code:
A
Abstract:

To provide a power supply system that makes it possible to improve power factor and power loss more than conventional and reduce the size of a transformer.

The power supply system 100 includes: a power supply transformer 110 that converts 100 V AC into 24 V AC; and multiple power supply units 200-1 to 200-n connected to the power supply transformer 110. The power supply unit 200-1 includes: a rectifier circuit 210 that rectifies 24 V AC by a synchronous rectifier bridge; a power factor improvement circuit 220 that improves the power factor of rectified voltage; and an output circuit 230 that outputs direct-current voltage. The power factor improvement circuit 220 includes an inductor L, FET 1, FET 2, and a control circuit 222 that controls switching of the FET 1 and the FET 2. The control circuit 222 adjusts the duty ratios of the FET 1 and the FET 2 and causes the output circuit 230 to output a desired direct-current voltage.


Inventors:
UCHIO SEIICHIRO
Application Number:
JP2008138886A
Publication Date:
December 10, 2009
Filing Date:
May 28, 2008
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KAGA ELECTRONICS CO LTD
International Classes:
H02M7/219; H02M3/155; H02M7/12
Domestic Patent References:
JP2006054934A2006-02-23
JP2001352760A2001-12-21
JP2007110869A2007-04-26
JP2008109783A2008-05-08
JP2001117649A2001-04-27
JP2006054934A2006-02-23
JP2001352760A2001-12-21
JP2007110869A2007-04-26
JP2008109783A2008-05-08
JP2001117649A2001-04-27
Attorney, Agent or Firm:
Kyozo Katayose