| 摘要 |
<p>Abstract A duplex encoder/decoder pair 11 and 13 for interfacing a first AC current source and a AC second current source with a first AC load 17a and a second AC load 17 over a single conductor 25, with a return conductor 19 is disclosed. The pair has an encoder portion 11 having a first input 21a and a second input 21b for connection to the two AC current sources, and an output 23 for connection to the single conductor 25. The pair has a decoder portion 13 having an input 27 for connection to the conductor 25, a first output 29a for connection to the first AC load 17a and a second output 29b for connection to the second AC load 17b. When the first input 21a is powered, the first load 17a will be switched on, and when the second input 21b is powered, the second load 17b will be switched on. The decoder portion 13 incorporates a first switching circuit 43a between the input 27 and the first output 29a, interfaced with a first turn on delay timer 45a to delay operating the load 17a, and a second switching circuit 43b between the input 27 and the second output 29b, interfaced with a second turn on delay timer 45b to delay operating the load 17b. 15l9H 17b) 17 a 4 o 2 o 2 a FIGURE 1 2-7 Z-9 6 T bnbToff at 45a 14/ FIGURE 2</p> |
