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A power control apparatus includes an inverter giving a rectangular waveform drive signal to an induction motor, an inverter voltage controlling section controlling an output voltage of the inverter, a converter boosting a voltage supplied to the inverter, a converter voltage controlling section con

A power control apparatus includes an inverter giving a rectangular waveform drive signal to an induction motor, an inverter voltage controlling section controlling an output voltage of the inverter, a converter boosting a voltage supplied to the inverter, a converter voltage controlling section controlling an output voltage of the converter, and a control signal generating section that controls the inverter voltage controlling section in a low-rotational speed region and controls the converter voltage controlling section in a high-rotational speed region.

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What is claimed is: 1. A power control apparatus for a motor-equipped turbo charger, comprising: a converter which receives a direct current voltage and boosts the direct current voltage to a boosted voltage; an inverter which receives the boosted voltage, generates a waveform drive signal of an ou

What is claimed is: 1. A power control apparatus for a motor-equipped turbo charger, comprising: a converter which receives a direct current voltage and boosts the direct current voltage to a boosted voltage; an inverter which receives the boosted voltage, generates a waveform drive signal of an output voltage from the boosted voltage, and gives the waveform drive signal to an induction motor to drive a rotary shaft of the turbo charger, the waveform drive signal having a waveform corresponding to a rotational speed of said rotary shaft driven by said induction motor; and a controller which controls the boosted voltage of said converter and controls the output voltage of the waveform drive signal outputted from said inverter, wherein said controller comprises: a control signal generating section which generates a control signal in accordance with an increase of a target rotational speed of said rotary shaft; a frequency controller which performs a frequency control for said inverter to increase a frequency of said waveform drive signal outputted from the inverter in accordance with the control signal; an inverter voltage controller which performs an inverter boosting control for said inverter to increase the output voltage of the waveform drive signal outputted from said inverter in accordance with the control signal when the rotational speed of said rotary shaft is within a low-rotational speed region; and a converter voltage controller which performs a converter boosting control for said converter to increase the boosted voltage outputted from said converter in accordance with the control signal when the rotational speed of said rotary shaft is within a high-rotational speed region. 2. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein the waveform drive signal given to said induction motor has a rectangular waveform regardless of the rotational speed of said rotary shaft. 3. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein said controller controls the output voltage of the waveform drive signal outputted from said inverter based on a duty ratio control and controls the boosted voltage outputted from said converter based on a duty ratio control. 4. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein said converter includes a multi-phase chopper type boosting circuit whose phase number is equivalent to a boosting ratio of the boosted voltage to the direct current voltage, each phase of which includes a choke coil connected to a battery power source and a converter transistor controlling power supply to said choke coil. 5. A motor driven turbo charging apparatus, comprising: a turbo charger; a multi-phase induction motor for driving a rotary shaft of said turbo charger; and a power supply circuit for supplying electric power to said induction motor to drive said rotary shaft, wherein said power supply circuit comprises: a multi-phase converter circuit which receives a direct current voltage and boosts the direct current voltage to an output voltage; an inverter circuit for converting the voltage of said converter circuit into a multi-phase power and supplying said multi-phase power to said induction motor; a frequency control section which controls a switching frequency of the multi-phase power outputted from said inverter circuit; an inverter voltage control section which controls an output voltage of the multi-phase power outputted from said inverter circuit by adjusting a switching duty ratio of said inverter circuit; and a converter voltage control section which controls the output voltage of said converter circuit by adjusting the switching of said converter circuit, wherein said inverter voltage control section and said converter voltage control section are arranged so as to increase respective output voltages in accordance with an increase of a rotational speed of said rotary shaft driven by said induction motor, said inverter voltage control section controls the output voltage of said inverter circuit when the rotational speed of said rotary shaft is within a first rotational speed region, and said converter voltage control section controls the output voltage of said converter circuit when the rotational speed of said rotary shaft is within a second rotational speed region denoting a region of a rotational speed higher than that in said first rotational speed region. 6. The motor driven turbo charging apparatus in accordance with claim 5, wherein said converter circuit has a six-phase or less-phase switching circuit including switching elements provided for respective six or less phases; said inverter circuit has a six-phase bridge circuit including switching elements provided for respective six phases to provide six power signals having respective six-phase rectangular waveforms to said induction motor as the multi-phase power; and said induction motor has six-phase windings receiving the respective six power signals from said inverter circuit. 7. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein said controller controls the boosted voltage of said converter and the output voltage of the waveform drive signal in accordance with an assist amount to be given to said turbo charger and the rotational speed of said rotary shaft.