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The Role of the Inverter
Figure 3. Transformerless DC/AC Conversion Circuit
At some point, the DC input has to be at a higher voltage level than the AC output. If the PV input is not
high enough, the system can either step it up with a transformer on the AC side (after the coils in Figure 3 )
or boost it in the DC/DC conversion stage. The AC transformer inherently provides galvanic isolation, as
does a phase-shifted full-bridge DC/DC converter with zero voltage switching (making it thus equivalently
a transformer). Figure 4 shows the DC/AC circuit equivalent when either type of transformer is introduced.
This circuit is equivalent either to the bridge in Figure 3 if the transformer is on the AC side, or to the
DC/DC converter in Figure 3 if the transformer is on the DC side.
Figure 4. Equivalent Circuit with Transformer
4 TMS320C2000™ DSP Controllers: A Perfect Fit for Solar Power Inverters SPRAAE3 – May 2006
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