Control design of a cascade boost converter based on the averaged model

Abstract

Cascade DC-DC power converters have as main advantage the large output-input voltage relation they provide. This advantage makes them ideal in applications such as the conversion of energy generated by means of non conventional sources. The boost converter dynamics is nonlinear and its linearization yields a non-minimum phase system, therefore a controller design must include the injection of damping to assure the asymptotic stability of the closed-loop system. In this paper is presented the design of an output feedback controller for the cascade boost of two stages, which is based on the dynamics of the averaged model of the power converter. The objective of the controller is the regulation of the output voltage to a desired reference, irrespective of the presence of load changes. The proposed controller makes use of only a subset of the state of the system, that is the output voltage and the input current. This paper also presents numerical simulation results which show the performance of the closed-loop system.

Design of a Portable Pulsed Power System for Needle-Free Jet Injection

“…The design attempts to convert 17 V to 210 V running at 92 % duty cycle using 350 V GaN transistors, which have much higher on-state resistance (42 mΩ for EPC 2050) than low voltage ones (4 mΩ for EPC 2032). Alternately, a cascaded boost converter [13] configuration as shown in Fig. 4(b) attempts to reduce the current stress on the 350 V GaN transistors, potentially allowing the whole system to be built with fewer components.…”

“…The chosen design employs a battery-powered boost converter to energize a 3-level inverter. Inspired by electric vehicles' battery boosted motor drives [12] and cascaded interleaved boost converters for high step-up conversion ratio [13], the proposed design combines these two patterns in order to construct a compact pulsed power system for NFJI. Although (b) An overview of the different sub-systems inside the portable power system.…”