Abstract:

According to a new type of the output intrinsically safety Quasi-Z-source(QZS) Buck converter , a 3-order current peak control of small signal model was deduced, because when the QZS network parameters L1, C1 is much smaller than conventional Buck converter LC filter network parameters, it can institute order reduction to the model ,then, the QZS Buck converter can obtain the same transfer function model of conventional Buck converter , so the conventional Buck converter compensator design method can be used directly to design the controller of the QZS Buck Converter. Finally, the paper used the commonly output protection circuit to verify the correctness of the theoretical analysis.

Key words: intrinsic safety, quasi-Z-source, Buck converter, peak current, small signal model.