As switches in the H bridge are switched @ high frequency, while others( Say S5 & S6) are switched at grid frequency. so what will be the pattern for that..?
The zero voltage vector is realized using a bidirectional switch(S5 & S6).During the positive half-wave of the load (grid) voltage, S6 is switched ON and is used during the
freewheeling period of S1 and S4. On the other hand, during the negative half-wave S5 is switched ON and is used during the freewheeling period of S2 and S3.
Darshan,
I suggest the original patent by Schmidt, Siedle, and Ketterer. It is available at:
https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US7046534.pdf
and among other things, explains the switching pattern in detail.
-Sanjay
So for 5kW system what is more suitable HERIC with UNIPOLAR or Full bridge with BIPOLAR*(to avoid leakage current..)..?
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