Engineering Theory & Mathematical Model
An inductor stores kinetic magnetic flux energy E = ½LI² and resists abrupt changes in current. If a coil switch opens without a return path, dI/dt spikes toward −∞, generating destructive kilovolt arcing across switch contacts! Placing a reverse-biased flyback diode across the RL coil gives decaying inductor current a safe freewheeling loop whenever S1 opens.
Interactive Lab Procedure
- Click switch "S1 Coil" to open the supply and watch yellow current dots continue circulating through the Flyback diode loop!
- Close S1 again and observe the smooth exponential current ramp τ = L/R = 80mH / 20Ω = 4 ms on CH2.
- Delete the Flyback diode (Select -> Delete) and toggle S1 to see the sharp negative inductive voltage spike on CH1!
Technical FAQ
What is the core governing formula for RL Inductor Current Ramp & Flyback Freewheeling Diode Simulator?
VL = L × (dI/dt), τ = L / R, E_mag = ½ L I² — An inductor stores kinetic magnetic flux energy E = ½LI² and resists abrupt changes in current. If a coil switch opens without a return path, dI/dt spikes toward −∞, generating destructive kilovolt arcing across switch contacts! Placing a reverse-biased flyback diode across the RL coil gives decaying inductor current a safe freewheeling loop whenever S1 opens.
Can I modify component values and rewire this circuit live?
Yes! The schematic above runs a live MNA SPICE engine. Click any part to adjust parameters, add or delete wires and components, and click Share URL to save your custom topology.