5 March 2018

Compare Step up Chopper and Step down Chopper

Step down Chopper

  • The average output DC voltage is always less than the input DC voltage.
  • The switching device is connected in series with load
  • The average output voltage Vo = a VDC
                                    Where VDC = Input DC voltage
                                                  a = Duty cycle

  • Motoring operation
  • First quadrant operation
  • Application : DC Motor speed control
  • Type A chopper is an example of step down chopper

Step up Chopper

  • The average output DC voltage is always greater than the input DC voltage. 
  • The switching device is connected in parallel with load.
  • The average output voltage Vo =  VDC  / ( 1 – a )

                                   Where VDC = Input DC voltage
  • Regenerative braking of motor operation
  • Second quadrant operation
  • Application : Voltage booster / Battery charging
  • Type B chopper is an example of step up chopper
compare step up chopper and step down chopper
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