what is the chopper ? chopper types | classification of chopper |

chopper

Principle of chopper :

Chopper is a static device then convert constant DC voltage to variable DC output voltage.

Classification of Chopper ;

1. step down chopper.
2. step up chopper.

1. Step down chopper ;

Vo < Vs

    where

Vs = input voltage.
Vo = output voltage.

When the average output voltage(Vs) is less then the input voltage called step down  chopper.

for R L load


                                                           Vs = Vt + Vo
                                                            Vo = Vs - Vt





where 
    T= cycle time period or chopping
 when chopper is ON
load voltage = source voltage
when is chopper OFF
                                                        Vo = 0
                                                       Is = Vs/Rl
                                                      Vo = Vs x Ton / T

Step up chopper


OR

                                                                     Vo = Vs               

The average output(Vo) greater then input voltage(Vs) is called step up chopper.

when chopper is ON ;


                                                    VL = Vs

when chopper is OFF ;


                                                   -Vs - Vl + Vo = 0
                                                    Vl = Vo - Vs
                                                   Vo = Vs + L di/dt




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