| 摘要 |
PURPOSE:To obtain a highly reliable DC power supply employing a single isolation transformer and parallel redundancy by selecting one of a plurality of parallel connected AC power supplies cyclically and feeding out operational commands sequentially with predetermined intervals. CONSTITUTION:An AC power supply 101 closes the contact of its control relay 14 only during an interval when a signal G1 is '1' and produces an AC power from the output terminal 16. Another AC power supply 102 closes the contact of its control relay 14 only during an interval when a signal G2 is '1' and produces an AC output from the output terminal 16. A predetermined interval is provided between both output timings. When voltage is not produced due to an abnormality in the AC power supply 101, it is detected immediately and switching is made to the normal AC power supply 102 which is thereby operated continuously. |
