Work

Current Commutation in a Switched Lithium‐Ion Cell used in Cascaded Half‐Bridge Multilevel Inverters

Year: 2021

Type: article

Abstract: In order to improve the efficiency of battery electric vehicles, the utilization of reconfigurable batteries and multilevel inverters based on low‐voltage Si MOSFETs gains growing attention. Focusing on the half‐bridge as basic switching unit, this paper examines voltage and current waveforms during switching. It is shown that the current commutation speed depends on various factors such as sign and amplitude of the current as well as the particular switching scenario. For instance, turning off a positive cell current takes 0.21 s while turning it on takes 0.9 s. In addition, it is revealed that depending on the switching scenario and current direction, the lithium‐ion cell supports or opposes the remagnetization of the parasitic inductances and therefore the switching losses of the MOSFETs. Switching a positive load current of 125 A from active to bypass converts 276 J into heat while switching from bypass to active converts merely 32.5 J into heat.

Source: IET Power Electronics

DOI: 10.1049/pel2.12088

Authors: Christian Hanzl, Christoph Hartmann, Markus Hölzle, Bernhard Liebhart, Michael Schmid, Christian Endisch

Institution: Technische Hochschule Ingolstadt

Language: English

Topic: Multilevel Inverters and Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,800