| 摘要 |
<p>A power switching circuit (20) selectively connects an electrical load (30) having first and second input connections (32, 34) to any one of a plurality of branch power circuits (19). Each branch circuit (19) includes a first and second conductor (L, N) defining a relative voltage therebetween. The power switching circuit (20) includes a selector switch (24) for selecting which of the branch circuits (19) is to be connected to the load (30). A triac (S1) is electrically connected to the first conductor (L) of each branch circuit (19) and to the first input connection (32) of the load (30) for selectively electrically connecting one of the first conductors (L) to the first input connection (32). A triac (S1) is electrically connected to the second conductor (N) of each branch circuit (19) and to the second input connection (34) of the load (30) for selectively electrically connecting one of the second conductors (N) to the second input connection (34). A control (44) is operated by the selector switch (24) for controlling the triacs (S1) to connect the respective first and second conductors (L, N) of the selected branch circuit (19) to the first and second input connections (32, 34) of the load.</p> |
