The present invention is a stable AC power supply that is stable for a long time and appropriate to various specifications without replacing the conventional equipment even in the event of a power failure to a device that supplies power to communication devices and communication equipment, such as base stations, unmanned switching centers, relay base stations, Internet operators, etc. The present invention relates to an uninterruptible circuit for a wireless repeater, so that communication is not interrupted.;The present invention is through the commercial power input unit 10 for receiving commercial power, the AC power output unit 60 for outputting commercial power supplied through the commercial power input unit 10, and through the commercial power input unit 10 A power detection unit 15 for checking whether or not normal power is supplied, an emergency DC power input unit 40 for supplying emergency power when abnormal power is supplied from the power detection unit 15, and the emergency DC power input unit DC-AC inverter 50 for converting the power of 40 to AC power, and zero cross point of power normally supplied from the commercial power input unit 10 to detect the emergency through the DC-AC inverter 50. Even when power is supplied, normal power is detected by the zero cross circuit unit 30 that corrects the same zero cross point as the normal power supplied through the commercial power input unit 10, and the power detection unit 15. In this case, the commercial power input unit 10 is connected to the AC power output unit 60, and when abnormal power is detected, the AC power compensated by the DC-AC inverter 50 is converted into the AC power output unit ( It is characterized in that it comprises a power supply unit (21, 22, 23, 24) connected to each terminal to supply to 60).
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