The second order dc-to-dc buck converter with input LC
filter is widely used in industry. An alternative 4th order converter which has
advantages in terms of control design leading to better transient performance
is presented. A complete DC (steady state average and ripple quantities) and AC
small-signal analyses of this converter for both uncoupled and coupled inductor
cases is provided. Conditions for achieving, in a lossless manner, a minimum
phase control-to-output transfer function are found, which ameliorates
regulator design while maximizing loop bandwidth. A closed loop regulator
design procedure is presented and the performance of a design example is
examined with a prototype. It is believed that this converter is a good
alternative in applications where the second order buck converter augmented with
an input filter has been traditionally utilized.
References
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