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

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.

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.

    

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.

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. 

TYPE E CHOPPER DRAWING.PDF

TYPE E CHOPPER ANALYSIS.PDF

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