Switch open-close state-detecting circuit

Details Switch open-close state-detecting circuit Switch open-close state-detecting circuit

1997-10-13

1999-06-15

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

327 18, 327530, H03K 519

Patent

active

059125667

ABSTRACT:
A switch open-close state-detecting circuit for supplying an interrupt signal to a control terminal of a controller in response to a change of state of a switch to either open or closed state by giving a monitoring voltage to a plurality of switches to supply a change of the monitoring voltage corresponding to opening or closing of the switches to a plurality of input terminals of the controller by detecting the change of the monitoring voltage to supply to the control terminal of the controller for controlling the operation modes of the controller. The switch open-close state-detecting circuit has a control IC including the same number of a plurality of pairs of input terminal and a plurality of output terminals for generating interrupt signals at the output terminals only when supply voltages to pairs of input terminals of the control IC are not equal, and delay circuits connected between the input terminals of the control IC. The change of the monitoring voltage is supplied to the pairs of input terminals of the control IC to supply the interrupt signal from the output terminals of the control IC to the control terminal of the controller.

REFERENCES:
patent: 4605863 (1986-08-01), Toudo et al.
patent: 4692709 (1987-09-01), Shvartsman
patent: 5382839 (1995-01-01), Shinohara

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