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Types of power electronic converters
1.
Rectifiers (AC to DC converters): These converters convert constant
ac voltage to variable dc
output voltage.
2.
Choppers (DC to DC converters): Dc chopper converts fixed dc voltage to a controllable dc
output voltage.
3.
Inverters (DC to AC converters): An inverter converts fixed dc voltage to a variable ac output
voltage.
4.
AC voltage controllers: These converters converts fixed ac voltage to a variable ac output voltage
at same frequency.
5.
Cycloconverters: These circuits convert input power at one frequency
to output power at a
different frequency through one stage conversion.
Power semiconductor devices
i.
Power Diodes.
ii.
Power transistors (BJT's).
iii.
Power MOSFETS.
iv.
IGBT's.
v.
Thyristors
Thyristors are a family of p-n-p-n structured power semiconductor switching devices
Power diodes
Power diodes are made of silicon p-n junction with two terminals, anode and cathode. P-N junction is
formed by alloying, diffusion and epitaxial growth. Modern techniques
in diffusion and epitaxial
processes permit desired device characteristics. The diodes have the following advantages High
mechanical and thermal reliability High peak inverse voltage Low reverse current Low forward
voltage drop High efficiency Compactness.
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