Introduction to Power electronics

1. Power Electronics
Brahmaiah Shaik

2. MODULE 1
• Introduction to power electronics
• Technologies existed before Power electronics
• History of Power electronics
• Applications
• What is power electronics

3. Mercury arc rectifiers (also known as Cooper-Hewitt or Hewittic rectifiers) were
extensively used to provide DC in high power applications, powers ranging from
kilowatts up to a few megawatts, at voltages ranging from 110V to 30KV.Their
operation is based on the discovery that an arc between a pool of mercury and a metal
anode only allows current to pass in one direction.

4. History of power Electronics
• Thyristors or silicon controlled rectifiers (SCR) by General
Electric Co. in 1958.
• After SCR, a great many power electronic devices have emerged
like GTO, IGBT, SIT, MCT, TRIAC, DIAC, IEGT, IGCT and so
on
• These devices are rated for several hundreds of volt and ampere
unlike the signal level devices which work at few volts and mill
amperes.

5. What is Power Electronics:
Power
Electronics
Power
engineering
Control
systems
Analog
Electronics
to get
regulated
electrical
energy

8. ▪ Majorly there are five types of power electronic circuits, each
having different purpose-
▪ Rectifiers – converts fixed AC to variable DC (such as half wave
rectifiers or full wave rectifiers)
▪ Choppers – converts fixed DC to variable DC
▪ Inverters – converts DC to AC having variable amplitude and
variable frequency
▪ Voltage Regulators – converts fixed AC to variable AC at same
input frequency
▪ Cycloconverters – converts fixed AC to AC with variable frequency

9. Applications of Power electronics

10. Scope of PE based on Power usage