Power Electronics

Hi guys it’s been a long time to know about one more topic. Today we shall see what power electronics meant by? First of all we shall see the basics of Power electronics. Power electronics is one of the important branch of electronics and electrical engineering. It deals with conversion & control of electric energy.

Power electronics can be defined as the application of the solid state electronics for controlling & conversion of electric power. To understand the topic we should go through the basic power electronic system.

Power electronic system:

power electronic system

We all know that the AC current and voltage from the mains has always fixed frequency and this supply can not be used directly ( for example computer needs SMPS for its working) so in order to convert one form of energy into other form of energy the power electronics system is used. Thus a Power Electronic system performs the conversion and controlling of electric energy. For instance rectifier is a good example because a rectifier converts AC into DC.    

Applications:

The power electronics is used in:

1. UPS and Standby power supplies
2. Power control in resistance welding induction heating, electrolysis etc.
3. Speed control of motors
4. Solid state power compensators, static contactors etc.
5. High voltage supplies for electrostatic precipitators and x-ray generators.
6. Power supplies for communication systems, telephone exchanges, satellite systems etc.

Advantages:

1.      Fast dynamic response due to static devices.

2.      High efficiency of conversion due to low losses in electronic devices.

3.      Compact size and light weight of the controllers due to electronic devices.

4.      Increased operating life and reduced maintenance.

5.      Their operation is highly flexible.

Disadvantages:

1. These generate harmonics.
2. power factor of some electronic controllers is very low.

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