Compare Step up Chopper & 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 V_o = a V_DC

                                      Where V_DC = Input DC voltage

                                                      a = Duty Cycle

• Motoring operation
• First quadrant operation
• Application : 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 V_o =  V_DC  / ( 1 – a )

                                     Where V_DC = Input DC voltage

                                                     a = Duty Cycle

• Regenerative braking of motor operation
• Second quadrant operation
• Application : Voltage booster / Battery charging
• Type B chopper is an example of step up chopper

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