Technical Presentation-Ii Chopper
Technical Presentation-Ii Chopper
Technical Presentation-Ii Chopper
CHOPPER
PRESENTATION BY
E.MITHHRA
ME(PED)-I
YEAR
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INTRODUCTION
A chopper
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PRINCIPLE OF OPERATION
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A chopped
During
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In
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First
Quadrant
D3 , the operation will be in fourth quadrant as the load
voltage is negative but the load current is positive. The
chopper acts as a step up chopper as the power is fed back
from load to source.
During the first quadrant operation the chopper CH4 will
be on . Chopper CH3 will be off and CH1 will be operated.
AS the CH1 and CH4 is on the load voltage v0 will be
equal to the source voltage Vs and the load current i0 will
begin to flow . v0 and i0 will be positive as the first quadrant
operation is taking place. As soon as the chopper CH1 is
turned off, the positive current freewheels through CH4
and the diode D2 . The type E chopper acts as a stepdown chopper in the first quadrant.
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Second
Quadrant
In this case the chopper CH2 will be operational and the
other three are kept off. As CH2 is on negative current
will starts flowing through the inductor L . CH2 ,E and
D4. Energy is stored in the inductor L as the chopper CH2
is on. When CH2 is off the current will be fed back to the
source through the diodes D1 and D4. Here (E+L.di/dt)
will be more than the source voltage Vs . In second
quadrant the chopper will act as a step-up chopper as the
power is fed back from load to source
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Third
Quadrant
In third quadrant operation CH1 will be kept off , CH2 will be
on and CH3 is operated. For this quadrant working the polarity
of the load should be reversed. As the chopper CH3 is on, the
load gets connected to the source Vs and v0 and i0 will be
negative and the third quadrant operation will takes place. This
chopper acts as a step-down chopper
Fourth Quadrant
CH4 will be operated and CH1, CH2 and CH3 will be off.
When the chopper CH4 is turned on positive current starts to
flow through CH4, D2 ,E and the inductor L will store energy.
As the CH4 is turned off the current is feedback to the source
through the diodes D2 and
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APPLICATION
Switched
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THANK YOU
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