Communications: electrical – Continuously variable indicating – With meter reading
Patent
1989-03-23
1991-02-05
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
98 4007, 307 40, 340310R, 34082567, G08C 1900, F24F 3056
Patent
active
049909088
ABSTRACT:
A remote load control system selectively applies power to a ceiling fan and a light from a wall control unit installed in an existing on/off wall switch location. A counter in a control logic circuit is clocked by the AC power input waveform and generates unique control logic signals corresponding to the status of mode select switches. The control logic circuit selectively clips one or more positive half cycles of the input power waveform following a full cycle in response to the actuation of a selected one of the mode select switches. A full AC power waveform corresponding with normal operation is generated when no mode switch is actuated. The control logic signals are input to a gate circuit which controls the on/off operation of a gate controlled power switch. According to this arrangement, mode select signals having a selected number (1, 2, 3 or 4) of positive half cycles of the AC power waveform are clipped following a full cycle of the AC power waveform. The mode select signal are input to a zero state detector which generates unique control logic signals to a microprocessor control receiver mounted on the fan assembly. The output of the zero state detector is a sequence of trigger pulses separated by one or more count pulses. Count pulses which remain logic high longer than a fixed minimum time interval are counted by the microprocessor, and the microprocessor produces a load select instruction which corresponds uniquely with the count.
REFERENCES:
patent: 4222035 (1980-09-01), Lohoff
patent: 4329678 (1982-05-01), Hatfield
patent: 4716409 (1987-12-01), Hart et al.
patent: 4719446 (1988-01-01), Hart
Griggs Dennis T.
Weldon Ulysses
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