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Title:
AC/DC CONVERSION CIRCUIT AND DC POWER SUPPLY
Document Type and Number:
Japanese Patent JP2014124004
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an AC/DC conversion circuit that derives a low supply voltage from a secondary winding for generating a high AC voltage without causing a wasteful power consumption.SOLUTION: AC/DC conversion circuits 100 and 200b are connected in parallel to a secondary winding L2 of a transformer T. The AC/DC conversion circuit 200b has diodes 211 and 212 constituting a full wave rectification circuit for full-wave-rectifying an AC voltage generated in the secondary winding L2, and a subsequent amplitude limitation circuit 250. The amplitude limitation circuit 250 has a PNP transistor 251 that turns off when an output voltage of the full wave rectification circuit is less than a reference voltage Vref and turns on when it is not less than the reference voltage Vref, and a PNP transistor 252 that turns on to pass the output voltage VAC of the full wave rectification circuit only for the period when the PNP transistor 251 is off.

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Inventors:
SUZUKI EIICHI
Application Number:
JP2012277713A
Publication Date:
July 03, 2014
Filing Date:
December 20, 2012
Export Citation:
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Assignee:
YAMAHA CORP
International Classes:
H02M7/12
Domestic Patent References:
JP2007037229A2007-02-08
JP2005064826A2005-03-10
JP2001185959A2001-07-06
JPS5556073U1980-04-16
JPS6345906A1988-02-26
Attorney, Agent or Firm:
Takashi Matsumoto



 
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