| 摘要 |
<p>PURPOSE:To detect easily an operating condition of switches and thus to simplify electrical wiring by a system wherein a resistance is connected to each switch, a resonance element is then connected at every switch blocks, which is connected with a common wire. CONSTITUTION:Switch blocks 13, 14 are connected to an active junction box 20 through connectors 11, 12. In this case, resistances Z<0>R-Z<n>R(OMEGA) are connected in series to switches S0-Sn respectively, and the set of switch and resistance is all connected in parallel. In additioln, series resonance elements A0, A1 variant in resonance frequency are connected at every blocks. On the other hand, an oscillator 21 is provided in the box 20 by the number of resonance elements, and a current at every frequences is detected through a current detection circuit 22. An output signal of the detection circuit is subjected to A/D conversions 23, 24, a result of the conversions is stored, and loads L0-Ln corresponding to each switch are driven through driving circuits 25, 26 according to the content stored.</p> |
