Power electronics digital notes b. Tech III year

 
REFERENCE BOOKS:
1.
Power Electronics; Circuits, Devices and Applications, M. H. Rashid, Prentice Hall of 
India. 
2.
Power Electronics, Vedam Subramanyam, New Age International (P) Limited, 
Publishers. 
3.
Elements of Power Electronics, Philip T. Krein, Oxford University Press. 
4.
Power Electronics, P. C. Sen, Tata Mc Graw-Hill Publishing. 
COURSE OUTCOMES:
At the end of the course the students get: 

A thorough knowledge on construction operation V-I characteristics commutation firing 
and protection of various power semiconductor devices, thyristors nature of the R, RL 
and RLE loads for different power inputs. 

AC-to-DC power conversion through 1-phase & 3-phase controlled rectifiers, DC-to-DC 
power conversion through step-up and step-down choppers. 

Different types of PWM (pulse-width modulation) techniques, steady-state and transient 
state analysis of all the power converters, which can be to applied to concepts of real-
world electrical and electronics problems & applications. 
 
 

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UNIT 
–
 I
Power semiconductor devices and commutation 
circuits 
 
Introduction to power electronics:
 
Power Electronics is a field which combines Power (electric power), Electronics and Control systems. 
Power engineering deals with the static and rotating power equipment for the generation, transmission 
and distribution of electric power. Electronics deals with the study of solid state semiconductor power 
devices and circuits for Power conversion to meet the desired control objectives (to control the output 
voltage and output power). Power electronics may be defined as the subject of applications of solid state 
power semiconductor devices (Thyristors) for the control and conversion of electric power. Power 
electronics deals with the study and design of Thyristorised power controllers for variety of application 
like Heat control, Light/Illumination control, Motor control - AC/DC motor drives used in industries, 
High voltage power supplies, Vehicle propulsion systems, High voltage direct current (HVDC) 
transmission.
Power Electronics refers to the process of controlling the flow of current and voltage and converting it to 
a form that is suitable for user loads. The most desirable power electronic system is one whose efficiency 
and reliability is 100%. 
Take a look at the following block diagram. It shows the components of a Power Electronic system and 
how they are interlinked.