| 摘要 |
The present invention relates to a method and arrangement for combined data and power distribution between nodes (MA, SL, SLN) in distributed data processing systems having a common communication bus (1, CANH/CANL). The communication bus includes at least one wire, transmitting digital information serially in form of dominant data bits at a first signal level (U1/U3 VD2) and recessive data bits at a second lower signal level (U2, VD1) in a sequential order dependent on the content of the data being transmitted. Nodes (SL) having a low power consumption obtain power supply through dominant bits being transmitted on the bus (1), which dominant bits charge a capacitance (15) in the low effect nodes (SL). Nodes (MA) having a higher power consumption obtain power supply from a voltage source (V1) separated from said bus. At least one node (MA) of the high effect nodes includes an amplification unit (20-24) which will be activated automatically in order to amplify the potential of dominant bits being transmitted by a low effect node. A simple extension with low effect nodes is obtained, which low effect nodes obtain power supply via the communication bus. The invention could also be implemented in systems using communication busses with differentiated dual wires.
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