- 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.
- 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 – Vdc – 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 waveform is shown in the figure B.
- The diode D turns on during chopper turn off time therefore the waveform starts from TOFF time rather than TON time.
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18/03/2017
Type B Chopper ( Class B Chopper )
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