Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1998-09-23
2000-06-13
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Switching systems
Switch actuation
307113, H01H 158
Patent
active
060752963
ABSTRACT:
A control circuit (200) mounted on a printed-circuit board comprises a control element (100) having a plurality of inputs (110.sub.i). Operating switches (Si) are connected with respective inputs (110.sub.i) by print tracks (12.sub.i, 30.sub.i). A signal source (10) generates a plurality of mutually different signals (.phi..sub.i) which are passed to the various switches (Si) and whose characteristic is priorly known. In case of, for instance, a short-circuit, a signal of a switch may end up at an input of the control element that does not correspond with that switch, but the control element can recognize this error situation because the received signal then has a wrong characteristic. The control element can then ignore the operating instruction, and/or generate an alarm signal. Thus the risk of incorrect operation by short-circuiting between adjacent print tracks is reduced, and the print tracks can be arranged closer to each other on the printed-circuit board.
REFERENCES:
patent: 4002973 (1977-01-01), Wiesendanger et al.
patent: 4525753 (1985-06-01), Shimeki
Gaffin Jeffrey
Roberto Rios
Thyssen De Reus B.V.
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