| 摘要 |
PURPOSE:To feed a constant and stable current to an intermediate repeater during either signal or double feeding with a relatively-simple constitution. CONSTITUTION:If feeding unit PF, the output of main power supply part circuit 1 is outputted by way of supervisory circuit 2, rectifier circuit 3 and common supervisory circuit 4, but part of the output is fed back to circuit 1 via control circuit 5. Part of the output of circuit 1 is extracted by circuit 2 and applied to decision circuit 7. Feeding unit PF' is the same. Decision circuits 7 and 7', in a coupled state, compare the output currents and control currents are supplied to circuits 1 and 1' so that the output current of a feeding unit with a greater value will be decreased. As a result, the control can safficiently be carried out by a fine current, output current variations duribg single feeding and double feeding results in small values, and the load during feeding is distributed uniformly, so that the output can easily be kept constant without remarkable variation in output even when either feeding unit is OFF. |
