Improved characteristic of load current of cascaded-flux compression generator / M. Jafarifar, B. Rezaeealam and A.Mir

One of the main problem of Cascaded-Helical
Magnetic Flux Compression Generators (Cascaded-HFCG) is the
returned energy from second stage winding to first stage winding
after starting of second stage operation. Since there is no
electrical connection between first stage winding and the load of
the generator, so a great part of energy doesn't reach to the load
and losts. This energy loss cause to decrease in generator
efficiency and has a great impact on output characteristic of the
generator. In this paper, an approach is proposed to minimize
returned energy and to improve the output characteristic of a
Cascaded-HFCG. The approach is based on time-varying
primary winding of dynamic transformer and addition of a
gradually incremental resistance in series with the first stage
winding. In order to verificate the ability of the proposed
approach, a computer code is programed based on a simple
model of the generator and a Cascaded-HFCG is simulated for
two cases: first case for the conventional generator and the other
for the proposed approach. It is demonstrated that for the
proposed approach, the output current has a greater value,
consequently the current gain of the generator becomes better.
The comparison between output currents for two cases shows
that the rise-time of output current becomes smaller for the case
of proposed approach.