Power Electronics



POWER ELECTRONICS
Belongs partly to power electronic engineers. Power engineering mainly concerned with generation transmission, distribution, and utilization of electric energy at high efficiency.

Introduction :
1. Power semiconductor diodes and transistors :

What is the P-N junction diode?
The P-N junction is the basic element for semiconductor diodes. One of the terminals is doped with p-type material and the other with N-type of material.

What is a Schottky diode?
A Schottky diode is one type of electronic component. A Schottky diode is most widely used in a mixer, logic circuit, radiofrequency, rectifier, solar cell etc.

What is a power transistor?
Power Transistor is a junction transistor designed to handle high current and power and also used in audio and switching circuits. Read more 

2. Thyristor :

What is Thyristor?
The terms thyristor denotes a family of semiconductor devices used for power control in DC and AC system. One of the oldest methods of this thyristor family called silicon control rectifier. 

Types of thyristor 
In recent years, most development effort has gone into both continued integration of the gating and control electronics into thyristor modules and the use of MOS technology to create gate structures integrated into the thyristor itself. Read more 

3. Power electronics applications :

SMPS : 
The disadvantages of linear power supplies (LPS), such as lower efficiency, transformers used are heavier and large, more power is wasted in the form of heat, dissipation is more etc. overcome by implication  of SMPS.

UPS :
There are several application where even a temporary power failure can cause a great deal of public inconvenience leading to large economic losses. Earlier UPS systems were based on an arrangement shown in figure

High voltage DC transmission :
It is well known that electric power generated in power plants is transmitted to the load centre on three phase ac transmission lines. However, for bulk power transmission over a long distance, High voltage DC transmission line are preferred. Read more 

4. Electric drive : 

In many of the industrial application, an electric is one of the most important component. In short, a drive is a combination of the various system combined together for the purpose of motion control.

Single phase DC drive :
The general circuit arrangement for single phase dc drives as shown in the figure. The arrangement for the speed control of a separately excited dc motor from single phase source

Three phase DC drive :
Large dc motor are always three phase converters for their speed control. A three phase controlled converters feed power to the armature circuit for containing speeds below base speed. Read more 

5. Chopper 

What is a chopper ?
A chopper is one type of electronic circuit used to refer numerous types of electronic switching devices and used in power control and signals applications. 

Chopper design circuit :
1. Type A chopper 2. Type B chopper 3. Type C chopper 4.Type E chopper

Application of chopper :
1. Chopper are used for DC motor control 2. Solar and wind energy conversion 3. It has more efficient as they involve in one stage conversion.  Read more

6. RTD, Thermocouple, and Thermistor

What is RTD?
RTD stands for resistance thermometer, also called as a resistance temperature detectors. It is basically sensors used to measure temperature. The RTD wire is a pure material, typically platinum, nickel or copper.

What is thermocouple?
The thermocouple is basically a temperature measuring device.  The thermocouple is used for measuring the temperature at one particular point.

What is thermistor?
A thermistor is defined as a kind of resistor whose electrical resistance depends on varies with the changes in temperature Read more


7. Transducer

What is a transducer?

A transducer is a device that converts the energy from one form to another. Usually, a transducer converts a signal in a form of energy to a signal in another.

Different types of transducer:

1. Classification based on the source of energy: Active and passive transducer 
2. Classification based on physical quantity: 
  • Pressure transducer - Bourdon gauge
  • Force transducer  - Dynamometer
  • Acceleration transducer  - Accelerometer
3.  Primary and secondary transducer  Read more