Single relay for motor and heater control

Details Single relay for motor and heater control Single relay for motor and heater control

1982-04-12

1984-11-20

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 48, F26B 2110

Patent

active

044830823

ABSTRACT:
A microprocessor controlled fabric drying apparatus is provided including structure having a rotatable fabric tumbler, a drive motor for driving the tumbler, and a heater for drying fabrics in the tumbler. A first circuit energizes the drive motor and includes a first relay switch and a centrifugal switch. The first circuit is operable for initiating energization of the drive motor in a first posture of the centrifugal switch and for maintaining rotation of the drive motor in a second posture thereof. A second circuit energizes the heater and includes a second relay switch. An interfacing circuit electrically interfaces the microprocessor with the drive motor and the heater through a single relay coil for operating the relay switches under control of the microprocessor. The first circuit includes a portion for maintaining energization of the drive motor during periods of deenergization of the heater and the microprocessor controls the heater without interrupting operation of the drive motor.

REFERENCES:
patent: 3944841 (1976-03-01), Janke
patent: 4213313 (1980-07-01), Kiefer et al.
patent: 4275508 (1981-06-01), Jones

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