Saturday, July 5, 2014
TYPE OF POWER ELECTRONIC
DIODE RECTIFIER
AC TO DC CONVERTERS
DC TO DC CONVERTERS
DC TO AC CONVERTERS
AC TO AC CONVERTERS
DIODE RECTIFIER
A diode rectifier circuit converts ac input voltage into a fixed dc voltage.The input voltage may be single phase or three phase.Diode rectifiers find wide use in electric traction,battery,electroplating,electromechanical processing,power supplies,welding and uninterruptibles power supply(ups) systems
AC TO DC CONVERTERS
These converter constant ac voltage to variable dc output voltage.These rectifiers use line voltage for their commutation,as such these are also called line-communited or naturally-commutated ac to dc converters.
Phase -controlled converters may be fed from 1-phase or 3-phase sources.These are used in dc drives,metallurgical and chemical industries,excitation system for synchronous machines ete.
DC TO DC CONVERTERS
A dc chopper converts fixed dc input voltage to a controllable dc output voltage.The chopper circuit require forced or load,commutation to turn-off the thyristors.For lower power circuits,thyristors are replaced by power transistors.
Classification of chopper circuit is dependent upon the type of commutation and also on the dirction of power flow.Chopper find wide applications in dc drives,subway cars,trolley trucks etc..
DC TO AC CONVERTERS
It is called as inverters.An inverter converts dc voltage to ac variable voltage.The output may be variable voltage and variable frequency.These converters use line or load or forced commutation for turning-off the thyristors.
Inverters find wide use in induction motor and synchronous motor drives,induction heating,UPS,HVDC transmission etc...
AC TO AC CONVERTERS
These convert fixed ac input volage into variable ac output.
application:lighting control,speed control of fans etc....
Nowadays, almost every application we are involved with requires power to run and a transformer is a device that brings it from the main power station to your industry in a safe and accurate manner. It basically works on the principle of mutual induction and has the ability to supply a large volume of power without changing the frequency. With the increase in demand for high-voltage power in big industries, transformer becomes the necessity of today’s world.
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