POWER SUPPLY FEEDER FOR CONSTRUCTION AND CONSTRUCTION METHOD FOR CABLE TELEVISION USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a power supply feeder for construction in which switching construction of an existing power supply feeder and an existing coaxial cable can be executed in an uninterruptive wave manner in maintenance work of a transmission path for a cable television.

SOLUTION: The power supply feeder for the construction is composed of a rectifier (12) for rectifying AC fed from an external power supply to DC, an inverter (13) for converting the rectified DC to the AC matched with the phase of the AC flowing in a coaxial cable (5) for the CATV and for outputting it, a transformer (14) for outputting the voltage of the inverter output by matching it with the voltage of the coaxial cable (5), and a control unit (CON) for controlling the inverter(13) so that the phase of the inverter output is matched with the phase of the AC flowing in the coaxial cable (5) by detecting the phase of the AC of the external power supply and the phase of the AC flowing in the coaxial cable (5).

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