Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [kickback]

24 questions
14
votes
3 answers

Where should I put the kickback diode in a transistor switch?

When driving inductive loads with transistors, we use kickback diodes. What I understand is a kickback diode supplies a path for the inductive charge to discharge. Also, an inductor will try to resist the change in the current, turning into…
abdullah kahraman
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4 answers

What keeps the kickback voltage from reaching an infinite voltage?

We know that the voltage over an inductor is defined by the formula: \$V = L * \frac {di}{dt} \$ So in the case where the current flow is suddenly interrupted (like when a mechanical contact is opened), voltage spikes occur in real life. However,…
C K
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9
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2 answers

Inductive kick-back voltage calculation

I am controlling a stepper motor (M42SP-5P) with BUZ11 MOSFETs. The winding resistances are \$22\Omega\$ and each winding is 18 mH as I measured. I am driving it with 24V, so let's say the drive voltage is about 1A. I know that the datasheet doesn't…
abdullah kahraman
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7
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1 answer

Snubber Capacitor Voltage Rating in the Real World

What are voltage ratings for the capacitors inside the common off the shelf ac snubber networks, such as 0.1uF + 100 Ohm ? It would seem that larger inductive loads can easily drive the capacitor voltage into the kilovolts. Is it ok because it only…
mcu
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7
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1 answer

Clamping Inductive Kickback in AC Circuits

I want to eliminate/clamp the inductive kickback that would result from turning off a large inductor, such as a relay or a transformer. In a DC circuit, I would use a diode to flywheel the current. But what do I use in a line voltage AC circuit? Is…
mcu
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6
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6 answers

Inductor polarity

Let's say an inductor has DC current going through long enough for it to completely build it's electro magnetic field. If the source voltage then goes lower, the inductor will 'use' the energy stored in its EMF to keep the voltage at its original…
Charles-Ugo Brouillard
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5
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1 answer

Why is an inductor kickback wave-like?

I though that an inductor, when it doesn't have current flowing through it anymore, would quickly discharge in the opposite polarity. More precisely, I was expecting one quick peak in a negative voltage, and then the voltage going back to its…
Charles-Ugo Brouillard
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2 answers

Switching inductive loads at long distances - best practice

This question focuses on the switching of inductive loads at a relatively long distance, specifically on handling the inductive kickback as a result of switching. The inductive load in question is an electromagnet/solenoid, which has a nominal…
wave.jaco
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Inductive "kick" and possible dangerous experiment

So I have this unmarked, unknown transformer (probably from a microwave oven so it is pretty beefy) and I thought that a safe way to determine the primary from the secondary windings would be to put 1 volt of dc connected to one of the windings and…
Salbando Jones
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Is Inductive Kickback Protection not necessary for AC?

For DC inductive loads, typically a flyback diode is placed over the motor so that when the current changes instantaneously it doesn't have a chance to build upon the switch contact and then create a spike next switching instance. However, for AC is…
Student
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Why is inductive kickback not V=IR?

I'll preface by saying I'm aware of questions like these 1, 2, and 3, but none of them answer my specific question. All of these questions say that the kickback from an inductor can be given by: \$V=L\frac{dI}{dt}\$ However, I've seen other sources…
JolonB
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How can I use the voltage generated from inductive kickback?

I'm designing a circuit that requires a high voltage pulse in order to fire a spark plug. I'm thinking of using an inductor to provide this pulse (via inductive kickback), but I'm struggling to figure out how to actually make it work without…
JolonB
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Will an opening fuse cause an inductive kick, or not?

I'm looking at designing a high-current crowbar circuit. We need to blow a 1400A fuse on demand. One question that has arisen is, what about inductive kick? If you short a large capacitor through a fuse, like so: the current in the fuse path may…
Stephen Collings
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how to calculate kickback voltage for the inductor in a RLC circuit?

I am designing an RLC circuit and can anybody suggest the method to calculate theoretically the kickback voltage produced by the inductor to choose the flyback diode. I have tried simulating the circuit and measured the kickback voltage which was…
adithya kalyan
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Can a contactor give an inductive kickback?

I have a ZBMINI (not -L) and use it to toggle my heating (2kW). In between I put a contactor because I trust it to be more safe. The problem is that sometimes it toggles a few times extra. Depending on the amount, the heating is on whilst the switch…
geiregjo
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