Control circuits for solenoids

Details Control circuits for solenoids Control circuits for solenoids

H - Electricity

01

F

318/1

H01F 7/18 (2006.01) F02D 41/20 (2006.01) F02D 41/30 (2006.01) H01H 47/32 (2006.01)

Patent

CA 1131298

A B S T R A C T 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 of 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.

334312

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