Introduction of type E chopper
The type E chopper is a four quadrant chopper. The type E chopper is parallel combination of two type C chopper. The combination of chopper CH1, chopper CH2, diode D1 and diode D2 makes one type C chopper and other is made from chopper CH3, chopper CH4, diode D3 and diode D4. The DC supply is short circuited if chopper CH1 and CH4 or chopper CH2 and CH3 is simultaneously switched on.
Power circuit diagram of type E chopper
Working of type E chopper
The working of type E chopper is explained here.
First quadrant
When chopper CH1
and chopper CH2 are switched on, the load current flows through (+)Vdc –
A – CH1 – LOAD – G – CH2 – K – Vdc( – ). The output voltage and current both
are positive therefore it is first quadrant operation.
Second quadrant
When chopper CH3
and chopper CH4 are switched off, the stored energy of inductor dissipates
through G – LOAD – F –D1 – (+)Vdc – Vdc( – ) – L –
D2 – H – G. The output voltage is positive but output current negative
during that period therefore it is second quadrant operation.
Third quadrant
When chopper CH3
and chopper CH4 are switched on, the load current flows through (+)Vdc –
C – CH3 – G – LOAD – F – E – CH4 – Vdc( – ). The output voltage
and current both are negative therefore it is third quadrant operation.
Fourth quadrant
When chopper CH1 and chopper CH2 are switched off, the stored energy of inductor dissipates through F – LOAD – G – H – D3 – D –(+)Vdc – Vdc( – ) – D4 – F. The output voltage is negative but output current is positive during this period therefore it is fourth quadrant chopper operation.
Type E chopper as step down chopper
When the chopper works
in first and third quadrant, the output voltage is always less than the input
voltage resulting it is step
down type chopper.
Type E chopper as step up chopper
Similarly when the chopper works
in second and fourth quadrant, the output voltage is always greater than the
input voltage resulting it is step
up chopper.
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