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Title:
LOW RIPPLE POWER SUPPLY
Document Type and Number:
Japanese Patent JP2007159264
Kind Code:
A
Abstract:

To provide a low-ripple power supply capable of not increasing a current ripple of individual voltage reversible chopper and capable of reducing the whole current ripple.

This low-ripple power supply is constituted of a voltage reversible chopper N (N is a positive odd number) set which has a positive side step-down chopper 31 connected to a common DC power supply 1 and for supplying a positive DC to a common load 7 through a positive side coupling reactor, and a negative side step-down chopper 41 connected to the DC power supply 1 and for supplying a negative DC to the load 7 through a negative side coupling reactor. A phase difference between a carrier wave for pulse width-controlling a switching element of the positive side step-down chopper of the respective voltage reversible choppers and the carrier wave for pulse width-controlling the switching element of the negative side step-down chopper is defined as π. The phase of the carrier wave of the switching elements of the positive side step-down chopper of the voltage reversible chopper N set, and the phase of the carrier wave of the switching elements of the negative side step-down chopper are uniformly shifted by 2π/N.


Inventors:
SODA MANABU
OKAMI TOMOHISA
Application Number:
JP2005350444A
Publication Date:
June 21, 2007
Filing Date:
December 05, 2005
Export Citation:
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Assignee:
TOSHIBA MITSUBISHI ELEC INC
International Classes:
H02M3/155
Domestic Patent References:
JP2005253199A2005-09-15
JPH08242577A1996-09-17
Attorney, Agent or Firm:
Hajime Yamashita



 
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