Controle da Tensão de Saída de um Sistema IPT por Estimação de Estado Utilizando o Filtro de Kalman

Abstract

Nowadays, inductive power transfer systems (IPT) have located numerous application, highlighting for example the charging of cell phone batteries, and electric vehicles. In the present article, the IPT is applied in such a way that the load voltage is kept constant, and it is implemented a Kalman filter that utilizes a signal synchronized with the inverter output voltage and the voltage measured at the rectifier switch as input variables. As output signal, the filter provides the voltage across the secondary compensation capacitor. The output of the Kalman filter is used as one of the switching signals of the rectifier that supplies the load. Computer simulations are performed in the Matlab environment for different values of load resistance and coupling factors of the IPT, where the maintenance of the load voltage is perceived.