Open AccessCurrent Commutation in a Switched Lithium‐Ion Cell used in Cascaded Half‐Bridge Multilevel Inverters
Author(s) -
Hanzl Christian,
Hartmann Christoph,
Hölzle Markus,
Liebhart Bernhard,
Schmid Michael,
Endisch Christian
Publication year - 2021
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/pel2.12088
Subject(s) - commutation , voltage , current (fluid) , electrical engineering , switching time , commutation cell , waveform , computer science , control theory (sociology) , engineering , power factor , control (management) , artificial intelligence , constant power circuit
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 μ s while turning it on takes 0.9 μ 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 μ J into heat while switching from bypass to active converts merely 32.5 μ J into heat.