Type B Chopper ( Class B Chopper )

• The type B chopper works in second quadrant it means that the output voltage positive and output current negative. 
• The load current flows through load to supply side.
• When chopper CH1 is switched on, the output voltage becomes zero but load current flows from load to supply side through LOAD – L – CH1 – LOAD because of back emf of the load.

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• When chopper CH1 is switched off, the output voltage is greater than the input voltage because of stored energy of inductor. 
• The diode D becomes forward biased and load current flows through path LOAD – L – D – V_dc – LOAD.
• This type chopper is called as step up chopper because the output voltage is greater than the input voltage. 
• The application of this chopper is in the regenerative braking of DC Motor. 
• The output voltage and current waveforms are shown in the figure B. The diode D turns on during chopper turn off time therefore the waveforms starts from T_OFF time rather than T_ON time.

TYPE B CHOPPER.PDF

VOLTAGE AND CURRENT WAVEFORMS OF 

TYPE B CHOPPER.PDF

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