Kabushiki Kaisha Toshiba

Kouichi Kaneko

Nagataka Seki

A power converter apparatus for use in supplying power from a DC power source to a load, including a chopper connected to the DC power source; an inverter connected to a DC output of the chopper for supplying converted AC power to the load; an error amplifier for detecting an output voltage of the power converter apparatus and controlling the output voltage so as to maintain the output voltage equal to a predetermined reference value; and a voltage control circuit for generating a gate signal for the chopper, including an oscillator circuit for producing a variable frequency signal having a frequency varied in accordance with an output signal of the error amplifier, and a phase shifter for producing the gate signal with a pulse width varied in synchronism with the output signal of the oscillator circuit and for applying the pulse width varied gate signal to the chopper. In this way the chopper frequency is decreased to improve the operating efficiency during light-load operation.

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Fuchu, Japan

Kouichi Kaneko