solenoid | PartQuest™ Explore

Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

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Solenoid update for Live Solenoid Driver Application of NCV84160

Mike Donnelly
Designer19

Mike Donnelly

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10 years 5 months

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Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

Description

Live Application Example of the NCV84160 High Side Protected FET used as a Solenoid Driver.The user can change the .... not finished below here--------------------- battery voltage as well as the lamp power rating and peak inrush current parameters. For example, you can see what would happen if the vehicle owner decides to make the car interior brighter by connecting a 65 Watt/Inrush current 40A automotive headlamp into the interior lamp socket! After making those changes, just push the green "Play" arrow and a new simulation will be run ... after about a minute, you'll see that the NCV84160 limits the peak current to under 12A, and eventually enters on/off thermal limit cycling at an even further reduced peak current level, protecting the upstream power distribution system from the overload condition.This design shows a concept for using the Current Sense (CS) output from the NCV84160 to detect activation and mechanical "pull-in" of a driven solenoid. The idea is that the inductance of transformer can be used to detect the transition from positive to negative current slope, a characteristic signature of a solenoid during pull-in. The rising current during activation is temporarily reversed due to the back-emf caused by armature motion.You can see the key benefit of this by looking in the upper-left waveform viewer display, where the actual armature motion (orange waveform) is indicated by the digital "d_closure_detection" signal (light blue waveform).This design is not ideal, in that a rather high inductance (20mH) transformer is needed to generate sufficient negative voltage to trip the detection comparator (-5mV). But if a larger fraction of the load current could be output on the CS pin, a proportionally lower inductance transformer could be used.

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PierfrancescoZuccato
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krzysztof.b
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Mike Donnelly
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