Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1979-08-07
1981-10-13
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361194, 123490, F02D 502, G05B 1101
Patent
active
042951771
ABSTRACT:
A solenoid control circuit includes a first switching element which connects one side of the solenoid load to earth via a current sensing resistor. The other side of the solenoid load is connected by a second switching element to a supply rail. This second switching element is biased to conduct but can be turned off by either of two comparators which are connected to compare the voltage across the current sensing resistor with two different reference voltages. Each comparator has hysteresis and the circuit operates so that one comparator operates to switch off the second switching element when a predetermined current level is reached and the other comparator operates to switch the second switching elements on and off at lower current levels between said predetermined current level and the lower threshold level of the first comparator.
REFERENCES:
patent: 3549955 (1970-12-01), Paine
patent: 3896346 (1975-07-01), Ule
patent: 3982505 (1976-09-01), Rivere
patent: 4180026 (1979-12-01), Schulzke et al.
"Pedestal Driver for Inductive Loads," Bateson, et al., IBM Technical Disclosure Bulletin, vol. 20, No. 8, Jan. 1978.
"Current Driver for Inductive Loads with Pedestal," Arnold, IBM Tech. Disclosure Bulletin, vol. 17, No. 4, Sep. 1974.
Salway Peter H.
Woodhouse Richard G.
Lucas Industries Limited
Miller J. D.
Schroeder L. C.
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