Power BJT

Power BJT is the power level counterpart of the normal signal level BJT. Power BJT, as already mentioned in the earlier articles, is only used as the Switch in power electronics circuits. Construction of power … Read more

Switching Characteristics of Power Diode

Switching characteristic is the dynamic characteristic which shows the variation of the diode current or voltage with respect to the time. A power diode takes finite time to change its state from ON (conduction-state) to … Read more

Gas Insulated Substation

Gas Insulated System an Introduction of GIS

Gas Insulated System or GIS is the modern form of an electrical substation. The power system voltage is rising day by day. Along with this, the system current also rises. Hence, power switchings need a proper … Read more

SF6 Gas An Introduction of SF6 Gas

Some Typical Properties of SF6 Gas The Chemical Formula: – SF6. The Molecular Weight:- 146.05 g/mol. The gas is a colorless non-flammable gas. This gas is also nontoxic. This gas is five times heavier than … Read more

Power Diode

What is a Power Diode?

You may have already gone through the definition of Power Electronics (i.e. electronics applied at power-level). Similarly, Power Diode is the Diode (semiconductor-based p-n junction diode) which works at High Power and High Voltage level. … Read more

Types of Power Diode

We classify Power Diodes as shown in the figure. This classification is mainly on the basis of Reverse Recovery Time and the manufacturing process, Penetration of the Depletion Region (into the n+ layer) during the … Read more


Reverse Recovery Characteristics of Diode

It is a transient condition. We obtain this characteristic when the diode enters the reverse biased state (i.e. the off-state) from the forward Biased state (i.e. the on-state). It is exactly the reverse process of … Read more

ON OFF Characteristics of Power Diodes

Diodes are classified, based on two criteria. Based on the width of the depletion region during Reverse Biased condition Based on the Reverse Recovery Time (to be discussed under ‘Reverse Recovery Characteristics’) and manufacturing process. … Read more

freewheeling diode

Freewheeling Diode and its Working Principle

A freewheeling diode is a protective diode. We use this diode only for protecting the semiconductor switches. Such semiconductor switches are diodes, transistors (BJT/MOSFET/IGBT), thyristors, etc. In the above figure, we connect a diode across … Read more