Synthetic ripple hysteretic powder converter

Abstract

A novel switching hysteretic power converter is presented. The converter includes the generation of a synthetic ripple signal and a feedback network to combine a signal in phase with the inductor current with a signal proportional to the regulated output voltage. The presented approach provides a switching boost converter with a much simpler control method with respect to conventional inductive boost power converters. The hysteretic control provides stable operation in all conditions with excellent load and line transient response. Furthermore the hysteretic control allows high frequency switching, reducing the size and cost of the passive components. The presented converter includes the Discontinuous Conduction Mode of operation to achieve very high efficiency at light loads. The presented approach can also be applied to buck switching power converters with excellent performance in terms of transient response, stability, efficiency and operation at high switching frequencies. The approach can be extended also to the hysteretic control of isolated switching flyback converters.