# Questions tagged [kickback]

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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 ...
82 views

### Questions about Inductive Kickback and what causes an inductor to discharge?

This is most likely a dumb question, just for some reason I have just forgotten the fundamentals about how charging and discharging work. Essentially my question is for this simple circuit: When the ...
97 views

### DC motor causing project to work unexpectedly

We have developed in protoboard the following schematic for driving a DC motor with transistor for Arduino, but instead of using the PN2222 transistor, we are using a MOSFET IRF540, and instead of ...
2k views

### 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 ...
156 views

### Why am I seeing more inductive spikes from my motor at a higher duty cycle?

What is the mechanism that causes more inductive spikes with a higher duty cycle, even if the frequency of the pwm is held constant? Doesn't the motor create voltage kickback only when it is turned ...
2k views

### Selecting Flyback Diode for Inductive Load

I intend to run a 48V DC water pump which uses this motor (http://www.leeson.com/leeson/searchproduct.do?invoke=viewProductDetails&motorNo=098382.00&productType=0) through a solid-state relay ...
511 views

### 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 ...
251 views

### Inductive kickback when applying PWM to the output of an alternator

simulate this circuit – Schematic created using CircuitLab I've got a fairly odd LED setup whereby a vehicle's alternator is being used to generate the power (rectified to DC) required to run ...
662 views

### 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 ...
547 views

### 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 ...
178 views

### Observing kickback voltage in LC circuit

I'm driving an LC load using ULN2003AN IC. The input pulses are 5V at 25 KHz with 50% duty cycle. I connected an oscilloscope (VM1) to the coil. I was hoping to see some kickback a voltage levels, ...
242 views

### What current rating does my kickback diode need to have?

This seems like it should have been asked before, but I can't find anything. I've got a large 12v DC motor (11A startup surge, 7a running current) that I'm PWM-ing at ~20khz through a mosfet. I, ...
2k views

### 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. ...
1k views

### 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 ...
494 views

### 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 ...
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 ...