Semiconductor Devices: The Snubber Diode
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- Опубликовано: 4 окт 2024
- Transistor switches with inductive loads can be problematic. As inductor current cannot change instantaneously, this gives rise to an "inductive kick" or voltage spike. This spike can damage the switching transistor along with other components in the circuit. One method of mitigating this problem is through the use of a snubber diode, also known as a flyback or clamp diode.
References: Operational Amplifiers: Theory and Application, Chapter 4 section 7.
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Great video, Professor. You are not wrong in your explanation, but I just want to point out that the main reason why the current in an inductor cannot change instantaneously is because the derivative must exist at every point. This requires continuity in the current function. Great work!
True. I assume familiarity with RL transient response.
Beautiful !
With a motor being similar to a transformer than can physically rotate, is the inductive spike as coils are sequentially activated blunted because of physical rotation?
Fantastic explanation, is there any way to discharge the current loop in the snubber circuit so you don't overshoot the 10 volts (10.8V on the Vce waveform)?
10V is what's driving the circuit so I assume you're referring to the extra 0.8, yes? Generally it shouldn't be a problem, but you could get a diode with a lower forward voltage, e.g., schottky diode.
What software are you using?
TINA-TI.
Thankyou. Presumably, if we put the diode astride the inductor only, the ringing/continuation of current is longer? In other words, how does the position of the load resistor, in this example, effect the outcomes?
In the real real world, you can't. Remember, the resistor/inductor combo is a simple model for a real world inductor. There isn't a separate resistor.
@@ElectronicswithProfessorFiore Yes, indeed. I did forget about every component having some resistance. Thankyou!