| 摘要 |
<p>PCT No. PCT/AU96/00573 Sec. 371 Date May 11, 1998 Sec. 102(e) Date May 11, 1998 PCT Filed Sep. 13, 1996 PCT Pub. No. WO97/10639 PCT Pub. Date Mar. 20, 1997A system for controlling the connection of power from a main supply (11) to electrical devices (22) by way of switching devices (19). The system includes a low voltage, direct current power supply (10), a plurality of command units (15) connected to and powered from the power supply by way of an electrical connection (14), and a plurality of switching devices (19) connected to and powered from the power supply by way of the electrical connection (14). Each of the command units (15A, 15B and 15C) is arranged to generate a uniquely coded pulse-form command signal to a central processing unit (18) by way of the electrical connection (14), and the central processing unit is arranged to generate pulse-form actuating signals having codes determined by the command signals. The central processing unit is arranged to feed the actuating signals to the switching devices (19) by way of the electrical connection (14). The power supply (10) incorporates a voltage regulator (11) which includes circuitry which functions to detect the presence of the pulse-form signals on the electrical connection (14), and the voltage regulator includes means for modulating the output voltage of the power supply between two discrete levels responsive to and at a rate corresponding with that of the pulse-form signals.</p> |
