Title:
Switching power supply unit
Document Type and Number:
Japanese Patent JP5920076
Kind Code:
B2
Abstract:
In some aspects of the invention, a load state detecting circuit is configured so that a threshold voltage for determining the size of a load of a DC-DC converter is set in the load state detecting circuit based on a maximum value of an output voltage of a power factor correction converter in an operation-stopped state of the power factor correction converter, so that the load state detecting circuit outputs an operation-enable signal when a feedback voltage indicating the size of the load of the DC-DC converter exceeds the threshold voltage. Thus, by way of some aspects of the invention, it is possible to provide a switching power supply device which can control enabling and stopping operation of a power factor correction converter reliably in accordance with a load state of a DC-DC converter obtaining a predetermined DC output voltage by switching an output voltage of the correction converter.
Inventors:
Chen Kenichi
Application Number:
JP2012157052A
Publication Date:
May 18, 2016
Filing Date:
July 13, 2012
Export Citation:
Assignee:
Fuji Electric Co., Ltd.
International Classes:
H02M3/155; H02M3/28; H02M7/12
Domestic Patent References:
| JP2007181362A | ||||
| JP2000350460A | ||||
| JP2008312355A | ||||
| JP2007288855A | ||||
| JP2010220330A | ||||
| JP2011015570A | ||||
| JP4229068B2 |
Attorney, Agent or Firm:
Yuji Hoshino
Kazunori Watanabe
Kazunori Watanabe
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