Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1987-02-19
1988-07-12
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
364483, 324 76A, H01H 4728, G01R 1900, G01R 2300
Patent
active
047574208
ABSTRACT:
A motor controller system is taught in which an overload relay board utilizes a current monitor which produces an output signal which is related to the current being sensed thereby over a wide range of currents which may vary for instance between 1 and 1,000 amperes. This indicative signal is converted to a DC voltage level which is then provided to the analog-to-digital portion of a microprocessor for being converted to a digital number for being processed by the microprocessor for causing the contacts of the motor controller to open at appropriate current values. The system utilizes an integrating capacitor which samples the output current from the sensor 32 times in succession providing a voltage which is proportional to the line current. This voltage which may exceed the input voltage level of the analog-to-digital converter is nevertheless supplied to the analog-to-digital converter and sampled internally by the microprocessor at double the line cycle time period until the 32 samplings have expired. If at any time during this doubled sampling process the output of the analog-to-digital converter digitally saturates, the left shifting technique is provided with other memory locations within the microprocessor to provide an approximate double value of voltage so that at the end of the 32 line half cycles a very close approximation of the actual current is contained within storage locations within the microprocessor for effective utilization thereby.
REFERENCES:
patent: 3339161 (1967-08-01), Conner et al.
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patent: 4461986 (1986-06-01), Maynard et al.
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patent: 4476423 (1984-10-01), Mallick, Jr. et al.
patent: 4584558 (1986-04-01), Moschek et al.
patent: 4638279 (1987-01-01), Brisson et al.
Engel Joseph C.
Leddy John G.
Saletta Gary F.
Hix L. T,.
Moran M. J.
Porterfield David
Westinghouse Electric Corp.
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