Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1987-04-27
1991-04-09
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
307234, 318806, 328111, H02P 318
Patent
active
050067770
ABSTRACT:
In a computer-based motor drive, a microcomputer is responsive to a plurality of input signals drived from the motor AC lines whenever contacts, or pushbuttons, commanding specific control operations to be performed, are closed. In such case, opto-couplers convert such AC voltage into a square pulse train which conveys a succession of digital high and low levels. A reference signal is derived, through an opto-coupler form the AC line, which in its high and low logic form is delayed in relation to the input signal trains. By sampling the input signal upon the occurrence fo a falling edge of the reference signal, then at least after the delay existing between the signals, the validity of the input signal is tested by comparing the two successive samples, thereby insuring a true command addressed to the microcomputer.
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Lorin C. M.
Smith Jr. David
Westinghouse Electric Corp.
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