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…
Month: April 2018
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.…
Single-phase half-wave rectifiers
This post tells about the single-phase half-wave rectifier, it waveforms and characteristics. A single-phase half-wave rectifier circuit is depicted below. This rectifier has a…
What is power thyristor
A power thyristor is the three terminal, bi-stable device, with alternating p- and n-layers in its structure. Its simplified scheme, equivalent scheme and sign…
What is power IGBT
This post answers the question what is the power IGBT. IGBT is the combination of two discrete devices – MOSFET and BJT. This approach…