Design and analysis of a new quadratic boost converter

In this paper a new quadratic boost, fifth-order, point of load boost dc-dc converter is proposed. To examine the proposed converter performance, a detailed time-domain and steady-state analysis is presented. Voltage boosting features are established and then the L, C components defining equations are formulated in terms of ripple quantities. The state-space models are derived, for continuous inductor current-mode of operation, and then small-signal analysis is performed to obtain the transfer functions. Later on these transfer functions are used in the digital controller design. The proposed circuit is able to boost the load voltage to a higher value than the conventional quadratic boost converter reported in literature. A 48 V, 50 Watt prototype point of load converter is built to supply the power at constant load voltage. A 12 V dc-battery is used as power source and 50 kHz switching frequency is adopted for the prototype converter operation both in simulation and experimentation. The proposed point of load converter effectiveness is demonstrated both in simulations and experimentation.