Switched-LC Hybrid Converters for Versatile Power Supply With DC and Multiple AC Outputs

Abstract

This paper presents, switched-LC hybrid converters for versatile power supply with single DC and multiple AC outputs. The proposed converters are two types i.e., 1) parallel and 2) series switched-LC hybrid multi-output converters (SLCHMOC $_{\mathrm {S}}$ ). The parallel-series SLCHMOCS offer multiple 3-phase AC and single-boost DC outputs simultaneously in a single stage. Parallel SLCHMOCS provide $n$ AC outputs with variable voltage and diverse load currents, alongside single boost DC. However, series SLCHMOCS is capable of giving ${n}$ number of AC outputs with the same load current and different voltages. To operate the proposed converters, a hybrid sinusoidal pulse width modulation with constant frequency shoot-through is used. In this work, the proposed converters are implemented for two units operating in a closed loop, supplying one DC and two AC outputs simultaneously at different voltage/current levels. As the proposed converters are capable of delivering multiple AC and single boost DC outputs, they can be applied to the hybrid microgrids. The converters’ steady-state, dynamic and efficiency analyses explain their behaviour. Experimental results validate their performance.

Keywords

• Constant frequency shoot-through (CFST)
• digital control
• hybrid multi-outputs converter (HMOCs)
• sinusoidal pulse width modulation (SPWM)
• three-phase inverter