An Improved Single-Inductor Triple-Output Converter with Predictive Control [articol]

Abstract

This paper proposes a new improved topology and control strategy for a single-inductor, triple-output converter with buck, boost and inverted outputs. In this topology, the inverted output is obtained without feeding back power from the load to the source. This minimizes circulating energy and consequent losses. The topology minimizes hardware and requires only three switches. Operation is possible both in discontinuous and continuous conduction modes. The design considerations of this converter are discussed and simulation results confirm the analysis. A predictive-like control of the converter is performed by direct analytical estimation of the duty cycle based on the inductor current in the present cycle. The regulation of the converter against line and load variations is confirmed through simulation results. Hardware validation is done using a Spartan FPGA system and results are presented. The topology and control are generic and can be scaled to more outputs.