Power electronics digital notes b. Tech III year

Figure: 1.1. Block diagram of DC power supply 

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A power electronic system converts electrical energy from one form to another and ensures the 
following is achieved −

Maximum efficiency 

Maximum reliability 

Maximum availability 

Minimum cost 

Least weight 

Small size 
Applications of Power Electronics are classified into two types − Static Applications and Drive 
Applications. 
Static Applications 
This utilizes moving and/or rotating mechanical parts such as welding, heating, cooling, and electro-
plating and DC power. 
DC Power Supply 
Figure: 1.2. Block diagram of DC power supply 
Drive Applications 
Drive applications have rotating parts such as motors. Examples include compressors, pumps, conveyer 
belts and air conditioning systems. 
Air Conditioning System 
Power electronics is extensively used in air conditioners to control elements such as compressors. A 
schematic diagram that shows how power electronics is used in air conditioners is shown below. 

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Figure: 1.3. Block diagram of Air Conditioning System 
 
Power electronic applications
Commercial applications
Heating Systems Ventilating, Air Conditioners, Central Refrigeration, 
Lighting, Computers and Office equipments, Uninterruptible Power Supplies (UPS), Elevators, and 
Emergency Lamps
Domestic applications
Cooking Equipments, Lighting, Heating, Air Conditioners, Refrigerators & 
Freezers, Personal Computers, Entertainment Equipments, UPS 
Industrial applications
Pumps, compressors, blowers and fans Machine tools, arc furnaces, induction 
furnaces, lighting control circuits, industrial lasers, induction heating, welding equipments