A ZVS integrated single-input-dual-output DC/DC converter for high step-up applications

This paper presents a novel integrated dc/dc topology with a step-up output and a step-down output. A new control scheme is developed to regulate both outputs simultaneously. Compared with discrete configurations, the proposed integrated converter utilizes a lower number of switches due to the reuse of components. The converter characteristics are studied comprehensively. It is demonstrated that all MOSFETs are turned on at zero voltage with reduced switching losses. For the step-up stage, the converter provides a high boost ratio and is able to clamp the switch voltage spikes. For the step-down stage, the steady-state characteristics and the dynamic performances are similar to that of the conventional buck converter. Moreover, the step-down output port can be extended to multiple ports, where the single-input-multiple-output (SIMO) version of converter can be derived. A 250 W, 42 V to 390 V and 15 V converter prototype is designed, analyzed and tested. The experimental results are presented to verify the feasibility of the topology.