Can inductors with toroid core be used as a High frequency excitation source. In other words can these coils induce a fast current pulse into a bare conductor ?
(To idealize the problem, let's assume the core permeability is constant)
Thank you for your answers
Hi Nadir, if combined with a fast switching transistor, and provided that "high frequency" means some 100 kHz, then the answer is: Yes. One way to do it is basically similar to ignition systems for combustion engines.
If you are looking for pulse durations of only a few nanoseconds or even less: I'm afraid the inherent capacitance of coils on cores would be too high. Together with the inductivity of the coil, this capacitance forms a resonant circuit. The basic idea of ignition systems is to store energy in the inductor, and to release it within a short interval, accompanied by high voltage. But the length of the interval cannot be below about 1 / (2 * resonance frequency).
To achieve resonance frequencies of some GHz the core material should not be ferrite but ceramic.
It is important to remind that the choice of a suitable core material is intimately connected with the power losses in the core.
Thank you all for your answers,
@Joerg Fricke : Do you mean that the energy released will propagate or only diffuse in the surroundings ?
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering