`
`A powerconversion apparatus that converts AC power into DC power, the power
`
`CLAIMS
`
`conversion apparatus comprising:
`
`a rectifier including a thyristor;
`
`a capacitor provided at a stage subsequentto the rectifier; and
`
`a controller that controls firing of the thyristor, wherein
`
`the controller causes powerto be supplied to the capacitor by performingthefiring of the
`
`thyristor after a predetermined time from when a voltage of the AC powerhasreached a zero-
`
`cross point, and sets the predetermined time short every time the firing of the thyristor is
`
`performed,
`
`the predetermined time being determined in accordance with a predetermined
`
`frequency of the AC power, the zero-cross point being where the voltage of the AC poweris
`
`zero, and
`
`in a case where a frequency of the AC power has fluctuated from the predetermined
`
`frequency, the controller performs control such that the firing of the thyristor is not performed
`
`after the predetermined time determined in accordance with the predetermined frequency.
`
`2.
`
`The power conversion apparatus according to claim 1, wherein the controller
`
`determines whether the frequency of the AC power hasfluctuated from the predetermined
`
`frequency by detecting a voltage waveform of the AC power until the predetermined time
`
`elapses from when the zero-cross point has been reached.
`
`3.
`
`The power conversion apparatus according to claim 2, wherein:
`
`the controller sets respectively voltage ranges of a plurality of voltage values for each
`
`predetermined timing within one period of the AC powerin accordance with the predetermined
`
`22
`
`
`
`frequency, and
`
`in a case where a voltage value of the AC powerdeviates from at least one of the voltage
`
`ranges set at a timing corresponding to the voltage value, the controller determines that the
`
`frequency of the AC powerhasfluctuated from the predetermined frequency.
`
`4.
`
`The power conversion apparatus according to claim 1, wherein in a case wherethe
`
`frequency of the AC powerhasfluctuated from the predetermined frequency, the controller does
`
`not perform thefiring of the thyristor during a predetermined period.
`
`5.
`
`The power conversion apparatus according to claim 1, comprising a voltage
`
`detector that detects a voltage value of the AC power, wherein
`
`the controller identifies the predetermined frequency based on the voltage value of the
`
`AC power.
`
`6.
`
`The power conversion apparatus according to claim 1, which is an on-vehicle
`
`chargerthat charges a battery mounted on a vehicle, the power conversion apparatus comprising:
`
`a powerfactor corrector including the capacitor; and
`
`a DC/DC converter provided at a stage subsequent to the powerfactor corrector, wherein
`
`in a case where a voltage of the capacitor has reached a predetermined voltage, the
`
`controller causes the power factor corrector and the DC/DC converter to operate and causes the
`
`battery to be charged.
`
`7.
`
`The power conversion apparatus according to any one of claims 1 to 6, wherein the
`
`rectifier is a rectifier circuit formed of the thyristor and a diode.
`
`23
`
`
`
`8.
`
`The power conversion apparatus according to claim 1, wherein the rectifier is a
`
`rectifier circuit formed of the thyristor and a switching device.
`
`24
`
`
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