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In
series inverter
, the commutating elements L and C are connected in series with the load. This
constitutes a series RLC resonant circuit. The Two
SCR
s are used to produce the halves (positive
and negative half cycle) in the output.
Figure: 5.12 Circuit diagram of series inverter
In the first half of the output currents when
SCR
T1 is triggered it will allow the current to flow
through L1, and load, and C2 thus charging. The capacitor C1 which is already charged at these
instant discharges through
SCR1
, L1 and the Load. Hence 50% of the current is drawn from the
input source and 50% from the capacitor. Similarly in the second half of the output current C1
will be charged and C2 will
discharge through the load, L2 and
SCR2
, Again 50%
of the load
current is obtained from the DC input source and rest from the capacitor. The
SCR
s T1 and T2
are alternatively fired to get AC voltage and current.
Operation of parallel inverter
The
single phase parallel inverter circuit
consists of two
SCR
s T1 and T2,
an inductor L, an
output transformer and a commutating capacitor C. The output voltage and current are Vo and Io
respectively. The function of L is to make the source current constant. During the working of this
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inverter, capacitor C comes in
parallel
with the load via the transformer.
So it is called
a
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