The present invention provides power to the base station, unmanned exchanges, relay base station, such as the Internet provider communication devices and communication equipment During a long time even without replacing the conventional equipment even in the event of a power failure in the device for supplying a stable and reliable AC power source is supplied as appropriate to the different specifications of the wireless repeater circuit which no longer being uninterrupted communication is interrupted. ; The invention and the commercial power supply input unit 10 that receives the commercial power, the utility power input unit 10 and the commercial AC power supply output section 60 for outputting the power, the utility power supplied through the input section 10 is normal and the power detector 15 to check whether the power is supplied via the direct-current power supply and the emergency input unit 40 for supplying emergency power in case an abnormal power is supplied from the power detector 15, converting the direct current power supply of the emergency DC power input unit 40 into AC power-AC inverter 50 and the commercial power supply input unit 10 detects a zero-cross point of the power supplied to the direct current in the normal-AC inverter ( the commercial power input unit 10 in the same normal power zero-cross point for correcting the zero-cross circuit which is supplied via the emergency even if the power is supplied through the 50) (30), the normal power from the power detector 15 was connected to the alternating-current power output section 60 to the commercial power source input unit 10 when the detection, if an abnormal power supply is detected, the DC-AC The AC power supply output to the AC power source through an inverter compensation 50 section 60 is respectively connected to the power unit to the terminals for supplying the (21, 22, 23, 24) being characterized in that comprises a.
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