| CPC H02P 27/08 (2013.01) [F24F 11/88 (2018.01)] | 11 Claims |
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1. A power converter adapted to convert an alternating-current voltage applied from an alternating-current power supply into a direct-current voltage to be applied to an inverter, the inverter driving a permanent magnet synchronous motor, the power converter comprising:
a reactor;
a converter comprising a plurality of switching elements and connected to the alternating- current power supply via the reactor, the converter being configured by connecting the switching elements in a bridge configuration and the switching elements each comprising an anti-parallel connected diode;
a capacitor connected to output ends of the converter and holding the direct-current voltage;
a first detector adapted to detect a voltage value of the direct-current voltage;
a second detector adapted to detect a voltage value, a frequency, or a zero-cross point of the alternating-current voltage;
a controller adapted to control an operation of the converter; and
a control voltage generator adapted to generate a control voltage for operating the controller, wherein
when the voltage value of the direct-current voltage is higher than a voltage value of the control voltage and a detection signal is not output from the second detector, an operation of the switching elements is stopped.
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