| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power distribution system in which communication using a pair line as a communication line can be performed satisfactorily when a plurality of feeding units are connected in parallel. <P>SOLUTION: If the plurality of feeding units 51 in which an input impedance of a feeding circuit 52 is made to be equal to a characteristic impedance value Z0 of a direct current supply line 22 are connected to the direct current supply line 22 in parallel, a parallel equivalent impedance of each feeding unit 51 becomes excessively small with respect to the characteristic impedance value Z0. As a result, a signal is not easily superimposed on a voltage waveform accompanying power feeding of the feeding unit 51 to have the possibility that a communication failure occurs in communication using the direct current supply line in the power distribution system as a communication line. However, when the plurality of feeding units 51 are connected to the direct current supply line 22, each input impedance of the feeding circuit 52 of each feeding unit 51 is variably set so as to make the parallel equivalent impedance of the each feeding unit 51 close to the characteristic impedance value Z0. <P>COPYRIGHT: (C)2011,JPO&INPIT |
