A rectifying circuit 2 for rectifying the voltage of the AC power source 1, a smoothing means 8 for smoothing the output voltage from the rectifying circuit 2 and a smoothing means 8 for smoothing the output voltage from the rectifying circuit 2, A short circuit means 4 for short-circuiting the AC power supply 1 to control at least one of a current or a voltage and a reactor 3 disposed on the AC power supply 1 side of the short circuit means 4, 9 for preventing the reverse flow of the current from the AC power source 1 side to the AC power source 1 side and a current flow for passing a current through a separate path connected in parallel with the backflow prevention element 5, A control means for controlling the operation of the current means 7 in response to the detection of the abnormality detecting means 105 by means of a current detecting means 105 for detecting an abnormality of the current means 7, And a switching control means (103) for performing the switching operation.
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