A Hybrid Three-Port Topology for Urban Charging Stations

TL;DR

This paper presents a hybrid multiport isolated DC-DC converter topology for urban EV charging stations, offering fixed switching frequency, isolation, soft switching, and high efficiency, suitable for diverse charging needs.

Contribution

It introduces a novel hybrid three-port topology with fixed-frequency operation, reduced complexity, and wide voltage range for urban EV charging stations.

Findings

Achieves 96% peak efficiency in prototype tests.

Provides wide output voltage range for different EV batteries.

Simplifies control with fixed-frequency operation.

Abstract

Electric vehicles are rapidly gaining popularity as a sustainable alternative to conventional gasoline. In urban areas, chargers with different ratings can accommodate the diverse needs of electric vehicles. However, the available multiport topologies have variable switching frequencies. This paper introduces a hybrid multiport isolated DC-DC converter for urban charging stations, incorporating fast and slow charging ports with a fixed switching frequency. It provides isolation and enables soft switching on the primary side of the converter without circulating current on its secondary side. The primary side does not need feedback, which reduces complexity. The second stage generates a wide output voltage range to charge the electric vehicle battery by employing a switch. In addition, the proposed topology offers reduced component count and simple control with fixed-frequency operation. This paper provides the concept and the operation modes. Experimental results are provided to validate its features. The prototype converter achieves 96\% peak efficiency.