Intrinsically-Safe Modular Power Converters for Electric Transportation

Marellapudi, Aniruddh; Mauger, Mickael J.; Kandula, Prasad; Divan, Deepak

doi:10.1109/itec48692.2020.9161533

Cited by 4 publications

(1 citation statement)

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“…Both research and the industry are developing and driving a number of alternative integrated battery-power-electronics combinations in lab setups and concept vehicles that would solve the issues by modularizing or even reconfiguring the previously hard-wired battery more or less during operation [12], [28]- [38]. Various reconfigurable battery technologies are in product development at several companies, demonstrating their economic potential [30], [39]- [47].…”

Section: Introductionmentioning

confidence: 99%

A Rapidly Reconfigurable DC Battery for Increasing Flexibility and Efficiency of Electric Vehicle Drive Trains

Li¹,

Yang²,

Gerry³

et al. 2024

IEEE Trans. Transp. Electrific.

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This paper proposes a drive train topology with a dynamically reconfigurable dc battery, which breaks hard-wired batteries into smaller subunits. It can rapidly control the output voltage and even contribute to voltage shaping of the inverter. Based upon the rapid development of low-voltage transistors and modular circuit topologies in the recent years, the proposed technology uses recent 48 V power electronics to achieve higher-voltage output and reduce losses in electric vehicle (EV) drive trains. The fast switching capability and low loss of low-voltage field effect transistors (FET) allow sharing the modulation with the main drive inverter. As such, the slower insulated-gate bipolar transistors (IGBT) of the inverter can operate at ideal duty cycle and aggressively reduced switching, while the adaptive dc battery provides an adjustable voltage and all common-mode contributions at the dc link with lower loss. Up to 2 /3 of the switching of the main inverter is avoided. At high drive speeds and thus large modulation indices, the proposed converter halves the total loss compared to using the inverter alone; at lower speeds and thus smaller modulation indices, the advantage is even more prominent because of the dynamically lowered dc-link voltage. Furthermore, it can substantially reduce the distortion, particularly at lower modulation indices, e.g., down to 1 /2 compared to conventional space-vector modulation and even 1 /3 for discontinuous pulse-width modulation with hardwired battery. Other benefits include alleviated insulation stress for motor windings, active battery balancing, and eliminating the vulnerability of large hard-wired battery packs to weak cells. We demonstrate the proposed motor drive on a 3-kW setup with eight battery modules.

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Section: Introductionmentioning

confidence: 99%