Compensation Networks

Abstract

Compensation networks are additional structures composed of capacitors and even coils in some cases. These elements are incorporated into the magnetic resonance chargers to configure a resonant tank with the coils that generate the magnetic field. In this way, the power transfer of the wireless charger can be significantly improved. There are multiple configurations in which the reactive elements of the compensation networks are arranged. When designing a magnetic resonance charger, it is important to carefully decide which compensation topology is being applied. For this decision, three main features should be considered. Firstly, the compensation topology will influence the system’s capacity to cope with misalignment. Secondly, some topologies allow for passive control, i.e. they can work as a constant current or voltage source independently of the load features. Thirdly, the compensation topologies define the stability of the system when considering the bifurcation phenomenon. This chapter discusses the main compensation topologies applied to EV wireless chargers, providing an in-depth analysis of their impact on the whole system. This study includes mono-resonant and multi-resonant topologies.