A new switched-capacitor boost-multilevel inverter using partial charging

In this brief, a new switched-capacitor-boost-multilevel (SCBM) inverter is proposed and implemented. This inverter possesses the distinct features of both voltage boost up and near-sinusoidal staircase output voltage. The key is to utilize partial charging in such a way that multiple voltage steps per capacitor can be realized, hence significantly reducing the number of capacitors for a given number of levels. Based on using only two capacitors, a 13-level SCBM inverter is designed and analyzed, with emphasis on assessing its total harmonic distortion. Both simulation and experimental results are given to confirm the theoretical analysis. © 2007 IEEE.published_or_final_versio

Análisis de Inversores Multinivel Alimentados en Tensión con Capacidad de Elevación

Los inversores multinivel son empleados principalmente en aplicaciones enfocadas a motores y a energías renovables. Tienen como finalidad el manejo de mayor potencia con una reducción de filtrado de la señal de salida que los inversores tradicionales, su principal ventaja es que dividen los esfuerzos de tensión y corriente de los dispositivos de conmutación. Por ello aún son interés de estudio, se proponen variantes a las estructuras básicas y se estudian nuevas técnicas de modulación o esquemas de control [1].  Recientemente se han encontrado estructuras multinivel con capacidad de elevación, la cual permite generar un número mayor de niveles de tensión, reduciendo el número de componentes comparadas con las estructuras básicas. Por tal motivo este artículo presenta la comparación entre estructuras multinivel con capacidad de elevación para resaltar las ventajas que proporcionan con respecto a las topologías básicas

DC/AC inverter based switched capacitor topology

This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonThis thesis presents a new DC/AC inverter circuit which is based on a switched-capacitor circuit topology with reduced components (power switch and capacitor) count for low power applications. The proposed circuit has distinct features of both voltage boost-up and near sinusoidal (multi-level/staircase) AC output voltage. The main idea is to utilise a simple circuit technique called resonant-based Double Switch Single Capacitor Switched-Capacitor (DSSC SCC) with variable duty cycle Pulse Width Modulation (PWM) control technique in such a way that multi-level voltage can be realised across a capacitor. In order to show the superiority of the applied technique, comparisons with other techniques/circuits configurations are presented. The circuit technique can significantly reduce the number of multiple stages of switched-capacitor circuit cells of the recent switched-capacitor multi-level inverter topology. The proposed inverter (with integrated DSSC SCC technique) can generate a line-frequency with 13-levels near sinusoidal AC output voltage with low total harmonics distortion. The output voltage can be achieved with the least number of components use and only a single DC source is used as an input. The proposed inverter topology is also reviewed against other inverter-based switched-capacitor circuit topology and the well-known multi-level inverter topology. The proposed inverter has shown a tremendous reduction in the total harmonics distortion and circuit component count in comparison with the recent Switched-Capacitor Boost multi-level inverter and the classical Cascaded H-Bridge multi-level inverter. Mathematical analysis shows the design of the proposed inverter and PSPICE simulation result to verify the design is also presented. The practical experiment implementation of the proposed system is presented and proves the correct operation of the proposed inverter topology by showing consistency between simulation results and practical results