Electrical transmission or interconnection systems – Switching systems
Patent
1988-04-06
1989-04-18
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
307 38, 307117, 307140, 379102, 379 84, H04M 1100, H01M 700
Patent
active
048230219
ABSTRACT:
First and second switches are switches to be detected. An AC signal source supplies AC signals to the switches. A controller includes: one photocoupler for outputting a signal when a supplied current is positive and is equal to or greater than a first current, and when the supplied current is negative and equal to or smaller than a second current; a first diode for receiving an output signal from the AC signal source when the first switch is turned on, and outputting a positive current to the photocoupler; a second diode for receiving an output signal from the AC signal source when the second switch is turned on, and outputting a negative current to the photocoupler; a first latch for latching an output signal from the photocoupler when the AC signal is positive; a second latch for latching output data from the photocoupler when the AC signal is negative; and a CPU. The CPU detects the ON/OFF states of the first and second switches in accordance with output data from the first and second latches, and performs a control operation.
REFERENCES:
patent: 3693060 (1972-09-01), Joyce
patent: 4267406 (1981-05-01), Perry
patent: 4384171 (1983-05-01), Klee
patent: 4438527 (1984-03-01), Hammond
patent: 4723269 (1988-02-01), Summerlin
patent: 4751401 (1988-06-01), Beigel et al.
patent: 4766330 (1988-08-01), Dreier
Catalog of Mitsubishi Versatile Sequencer, Mitsubishi Electric Corporation, Oct. 1984.
Catalog of SYSMAC C Flowchart Type Programmable Controller, Omron Tateishi Electronics Co., Ltd. Nov. 1984.
Mouri Fumitaka
Shimada Yasuo
Ip Paul
Kabushiki Kaisha Toshiba
Shoop Jr. William M.
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