Patent ID: 7151364

Claim:
A DC/DC converter comprising: a DC power supply input section; a coil section connected to a positive electrode side of said DC power supply input section, the coil section comprising a core, and a first coil and a second coil wound around said core in opposite wound directions, the turns ratio of said first and second coils being 1:1, so as to offset a magnetic field in which a magnetic field generated by a first input voltage supplied to said first coil causes said second coil to generate a first induced voltage substantially the same as said first input voltage to offset the magnetization of the core and a magnetic field generated by a second input voltage supplied to said second coil causes said first coil to generate a second induced voltage substantially the same as said second input voltage to offset the magnetization of the core; an output section that outputs voltage stepped up by an output electric current from said coil section; a first switch that is connected to an output side of said first coil and to a negative electrode side of said DC power supply input section, and that controls electric power to said first coil; a second switch that is connected to an output side of said second coil and to a negative electrode side of said DC power supply input section, and that controls electric power to said second coil; and a control section that controls said first switch and said second switch to alternately turn ON and OFF.