Electricity: motive power systems – Automatic and/or with time-delay means – Electrical conditions in circuit other than controlled motor...
Patent
1993-12-28
1995-12-05
Sircus, Brian
Electricity: motive power systems
Automatic and/or with time-delay means
Electrical conditions in circuit other than controlled motor...
318482, B65G 4308
Patent
active
054732344
ABSTRACT:
Force responsive sensors and circuitry which detect the present and absence of a meterial within a storage bin or hopper and activates a motor to maintain the level of the material within preset limits. The sealed sensors are state-of-the-art force sensing resistive types and the circuitry is all solid-state with no relays or other mechanical devices used. The ON/OFF condition of the motor is controlled by a triac switch whose gate is optically isolated from the control circuitry with the use of a zero-crossing turn on triac optical coupler. The low voltage and low power required to operate the logic and control circuitry is derived from a pair of bridge rectifiers that receive their AC inputs from the voltage across the triac when it is not conducting and from the secondary of a current monitor transformer when the triac is conducting.
REFERENCES:
patent: 4202438 (1980-05-01), Rotilio
patent: 4210895 (1980-07-01), Sado et al.
patent: 4527714 (1985-07-01), Bowman
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