Supervised start system for microprocessor based appliance controls
A supervisory start system is described for an appliance control that includes a microprocessor, manually actuatable keyboard switch means, and first and second relay means; the microprocessor including first, second and third input means and first, second and third output means and being conditioned to generate control signals at the output means upon receipt of electrical signals at the input means; the supervisory start circuit comprising, in combination, first, second and third transistors each having a base, an emitter and a collector. The first transistor means controls energization of the first relay means and is controlled by the manually actuatable switch means; the manually actuatable switch means being electrically connected to the first output means of the microprocessor and the base of the first transistor; the base of the second transistor being connected to the second output means of the microprocessor, the emitter of the second transistor being connected to a source of potential, the collector of the second transistor being connected to the emitter of the first transistor; the collector of the first transistor being connected to the first relay means; the second transistor being operable to connect the emitter of the first transistor to the source of potential when a signal from the second output means of the microprocessor is applied to the base of the second transistor; the microprocessor being conditioned to emit a signal at the second output means upon receipt of a signal at the first input means; means for latching the first transistor in a conducting condition upon being energized; and means for applying an electrical signal to the second input means when the first transistor means is in a conducting condition.
- Assignee:
- Robertshaw Controls Co., Richmond, VA
- Patent Number(s):
- US 4628439
- OSTI ID:
- 7142351
- Resource Relation:
- Patent File Date: Filed date 12 Dec 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRIC APPLIANCES
COMPUTERIZED CONTROL SYSTEMS
MICROPROCESSORS
RELAYS
SIGNALS
SWITCHES
TRANSISTORS
APPLIANCES
COMPUTERS
CONTROL SYSTEMS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
MICROELECTRONIC CIRCUITS
SEMICONDUCTOR DEVICES
320100* - Energy Conservation
Consumption
& Utilization- Buildings