Sample‐Data Modeling of a Zero Voltage Transition DC‐DC Converter for On‐Board Battery Charger in EV

Battery charger is a key device in electric and hybrid electric vehicles. On‐board and off‐board topologies are available in the market. Lightweight, small, high performance, and simple control are desired characteristics for on‐board chargers. Moreover, isolated single‐phase topologies are the most common system in Level 1 battery charger topologies. Following this trend, this paper proposes a sampled‐data modelling strategy of a zero voltage transition (ZVT) DC‐DC converter for an on‐board battery charger. A piece‐wise linear analysis of the converter is the basis of the technique presented such that a large‐signal model and, therefore, a small‐signal model of the converter are derived. Numerical and simulation results of a 250 W test rig validate the model.