Resonance Structure-based DC Voltage Variable Cascade Converter with Switching Capacitors

Abstract

The work examines the power supply system for autonomous infrastructure facilities. A circuit of an energy-efficient cascade DC voltage converter based on resonance structures with switching capacitors is considered. The primary source of electrical energy is a low-voltage storage battery, the voltage on which varies in the range of 16–25 V. An adjustable output cascade used in converter stabilizes the voltage across the load when the input voltage changes. Load power 3.5 kW. Mild wiring technology allows reducing dynamic power losses in power semiconductor switches and levels down the electromagnetic interference. Expressions for calculating the parameters of the reactive elements of the cascade converter are given. The elements were calculated and simulated in the PSIM environment. For a comparative assessment of weight-size parameters, a diagram of a resonance structures-based step-up converter with switching capacitors is shown. The weight-size indicators of the converters have been calculated. The number of semiconductor elements in a cascade converter is 2.8 times smaller than in a boost converter.