Inductor Kickback

The peak voltage on the capacitor can be derived from energy the energy in a coil for reference. When you apply a fixed voltage accross a inductor the current builds up linearly.

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Inductors Inductive Kickback

An inductor resists any changes in current.

Inductor kickback. If you open the switch the inductor tries to maintain the same current. This diode is a protection diode and basically what it does is it supplies a pathway for that inductor current when this voltage goes above the top end of the inductor. Real inductors you can buy are made from wire so have some finite resistance.

It does this by charging the capacitance between the contacts of the switch. The bigger the inductor the more inertia the current has. Inductive kickback with protection.

Thats kickback from an inductor. The inductor equation tells us there can be a large kickback voltage generated across the inductor. This is the basis of a snubber except a snubber has extra r in series with the capacitor to dissipate the energy a tad more quickly.

We give the inductors kickback current a path to flow by adding a diode. One way to deal with potentially destructive inductor voltage is to design an alternate path for the current. Heres a typical snubber for use with a triac and inductive load see circuit note.

If you were then to short out the inductor so the current could circulate it would do so forever if the inductor were perfect. C switch open inductive kickback is shorted by diode. Khan academy is a 501c3 nonprofit organization.

So this is called the effect of having this voltage go way north is called kickback. In this circuit the diode is placed in parallel with the coil such that it will be reverse biased when dc voltage is applied to the coil through the switch. For applications where the current must decay quickly high speed impact printers high speed relays etc.

Inductor kickback 2 of 2 our mission is to provide a free world class education to anyone anywhere. Donate or volunteer today. The only disadvantage of this protection circuit is that it lengthens the decay of current through the inductor since the rate of change of inductor current is proportional to the voltage across it.

Bswitch closed storing energy in magnetic field.

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