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 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.
BRIEF HISTORY OF POWER ELECTRONICS
The first Power Electronic Device developed was the Mercury Arc Rectifier
during the year 1900. Then the other Power devices like metal tank rectifier, grid
controlled vacuum tube rectifier, ignitron, phanotron, thyratron and magnetic amplifier,
were developed & used gradually for power control applications until 1950.
The first SCR (silicon controlled rectifier) or Thyristor was invented and
developed by Bell Lab's in 1956 which was the first PNPN triggering transistor.
The second electronic revolution began in the year 1958 with the development of
the commercial grade Thyristor by the General Electric Company (GE). Thus the new era
of power electronics was born. After that many different types of power semiconductor
devices & power conversion techniques have been introduced.The power electronics
revolution is giving us the ability to convert, shape and control large amounts of power.
SOME APPLICATIONS OF POWER ELECTRONICS
Advertising, air conditioning, aircraft power supplies, alarms, appliances (domestic and industrial), audio amplifiers, battery chargers, blenders, blowers, boilers,
burglar alarms, cement kiln, chemical processing, clothes dryers, computers, conveyors,
cranes and hoists, dimmers (light dimmers), displays, electric door openers, electric
dryers, electric fans, electric vehicles, electromagnets, electro mechanical electro plating,
electronic ignition, electrostatic precipitators, elevators, fans, flashers, food mixers, food
warmer trays, fork lift trucks, furnaces, games, garage door openers, gas turbine starting,
generator exciters, grinders, hand power tools, heat controls, high frequency lighting,
HVDC transmission, induction heating, laser power supplies, latching relays, light
flashers, linear induction motor controls, locomotives, machine tools, magnetic recording,
magnets, mass transit railway system, mercury arc lamp ballasts, mining, model trains,
motor controls, motor drives, movie projectors, nuclear reactor control rod, oil well
drilling, oven controls, paper mills, particle accelerators, phonographs, photo copiers,
power suppliers, printing press, pumps and compressors, radar/sonar power supplies,
refrigerators, regulators, RF amplifiers, security systems, servo systems,
machines, solar power supplies, solid-state contactors, solid-state relays, static circuit
breakers, static relays, steel mills, synchronous motor starting, TV circuits, temperature
controls, timers and toys, traffic signal controls, trains, TV deflection circuits, ultrasonic
generators, UPS, vacuum cleaners, VAR compensation, vending machines, VLF