It is very important to understand switching characteristics of power MOSFET. To understand the turn-on and turn–off process in power MOSFETs, we have to…
Author: eazambuja
Self-induction – Inductivity
Electromagnetic induction occurs in different ways. For example, when current changes in the circuit, there is different kinds of EMF that occurs in the…
Transmission line losses
All transmission lines are characterised by conductivity and dielectric losses. In some cases losses can be neglected, but not in others. When losses are…
Magnetic field energy
A magnetic field is characterised by the energy parameter. If we turn the switch S to position 2 (Figure 33), the current in the…
Magnetic field in the matter
Let’s consider magnets. Magnets are substances that create the magnetic field around them, without currents through the magnets. However, there are micro-currents that operate…
Matter magnetisation
Let’s consider the solenoid that creates a magnetic field when DC current goes through the coil. The field in the solenoid is uniform, and…
Magnetic types
Depending on the value of magnetic permittivity, magnetic substances are divided by the diamagnetics, paramagnetics and ferromagnetics. The first two classes are weak magnetics.…
Maxwell’s magnetic theory
Still a question that has to be answered is why conductivity electrons are moving in the magnetic field in the conducting circuit. (Figure 37).…
Shift current and Maxwell equations
Variable magnetic fields create a vortex electric field in the conductor, which leads to the electric current appearance in the conductor. Let’s consider two…
Enhancement MOSFETs
FET transistors are working differently than BJT transistors. In FET width of conducting channel is varied by applying of external electric field. They operate…