ABSTRACT
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`This power conversion device converts AC power to DC powerand is provided with: a
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`rectifier unit including a thyristor; a capacitor providedat a stage subsequentto therectifier unit;
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`and a control unit for controlling the firing of the thyristor. The control unit fires the thyristor
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`after a predetermined time from when a zero-cross point where the voltage of the AC poweris
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`zero has been reached, thereby supplying powerto the capacitor, said predetermined time being
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`determined in accordance with a predetermined frequency of the AC power. The control unit
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`also sets the predetermined time short every time when firing the thyristor and, when the
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`frequency of the AC powerhas deviated from the predetermined frequency, performs control so
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`as not to fire the thyristor after the predetermined time determined in accordance with the
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`predetermined frequency.
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`25
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