Circuit breakers, relays and other devices, which protect a whole circuit from drawing excessive current that can damage electronic device are categorize as overcurrent protection devices. These protective devices use electromechanical solenoids for their operation. Solenoid coils are rated to operate from 12-V to 24-V DC and 110-V to 230-V AC systems with a power consumption ranging from 8 to 20W. A solenoid that is operating with a nominal current of 30% (steady state) consistently raises the temperature in the coil to higher power dissipation. This reference design provides a solution to control the solenoid current using DRV110, a PWM current controller for solenoids, as well as monitor the proper operation of the plunger in valves using pulse width modulation-based (PWM) controllers along with a Back-EMF sensing circuit. Read more