Introduction of Type B Chopper
The type B chopper works in second quadrant it means that the output voltage positive and output current negative. The power output is negative it means that the power flows from load side to supply side. The type B chopper is also called as step up chopper because the output voltage is greater than the input voltage. Here, only power circuit of type B chopper is shown.
Working of type B chopper
When chopper CH1
is switched on, the output voltage becomes
zero out 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.
Type B chopper circuit diagram
Type B chopper waveform
The diode D turns on during chopper
turn off time therefore the waveform starts from TOFF time
rather than TON time.
Application of type B chopper
Regenerative braking of DC Motor.
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