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Type E Chopper ( Class 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.

__Working__
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First quadrant

- When chopper CH1 and
chopper CH2 are switched on, the load current flows through (+)V
_{dc} –
A – CH1 – LOAD – G – CH2 – K – V_{dc}( – ).
- The output voltage and
current both are positive therefore it is first quadrant operation.

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Second quadrant

- When chopper CH3 and
chopper CH4 are switched off, the stored energy of inductor dissipates through
G – LOAD – F –D1 – (+)V
_{dc }– V_{dc}( – ) – L – D2 – H – G.
- The output voltage is positive but output current negative during that period
therefore it is second quadrant operation.

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Third quadrant

- When chopper CH3 and chopper CH4 are switched on, the load current flows through (+)V
_{dc} – C – CH3 – G – LOAD – F – E – CH4 – V_{dc}( – ).
- The output voltage and current both are negative therefore it is third quadrant operation.

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Fourth quadrant

- When chopper CH1 and chopper CH2 are switched off, the stored energy of inductor dissipates through F – LOAD – G – H – D3 – D –(+)V
_{dc }– V_{dc}( – ) – D4 – F.
- The output voltage is negative but output current is positive during this period therefore it is fourth quadrant chopper operation.
- The DC supply is short circuited if chopper CH1 and CH4 or chopper CH2 and CH3 is simultaneously switched on.
- 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.
- 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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