A Compact Single-Phase Cascaded Three-Level AC/DC Converter With Variable DC Bus Voltage and Low CM Noise

This article proposes a new topology technology of a two-stage ac/dc converter with variable dc bus voltage control. The technology is a cascaded combination of a new type of single-inductor-based cascaded three-level totem-pole power-factor-correction (PFC) circuit and a three-level LLC half-bridge...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-01, Vol.39 (1), p.398-408
Main Authors: He, Yuanbin, Liu, Hao, Zhang, Junjie, Shen, Chenyu, Xie, Xiaogao, Hang, Lijun
Format: Article
Language:English
Subjects:
AC-DC converters
AC-DC power converters
AC/DC converter
charger
Circuits
common-mode (CM)
Data buses
Density measurement
Electric bridges
Electric converters
Electric potential
Electromagnetic interference
Inductance
Inductors
Power factor
Power semiconductor devices
Power system measurements
Switches
Topology
variable dc bus voltage
Voltage
Voltage control
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Summary:This article proposes a new topology technology of a two-stage ac/dc converter with variable dc bus voltage control. The technology is a cascaded combination of a new type of single-inductor-based cascaded three-level totem-pole power-factor-correction (PFC) circuit and a three-level LLC half-bridge converter. Although the existing variable dc bus voltage control strategy based on a two-level ac/dc converter exhibits better overall efficiency than fixed dc bus control, it faces problems such as high withstand voltage stress of the power semiconductor device and large inductance volt-second product and filter volume. In order to address these issues, a novel cascaded three-level ac/dc converter with 600 V withstand voltage devices and phase-shift modulation technology is proposed. The new single-inductor-based mirror-symmetric cascaded three-level totem-pole PFC can achieve low common-mode electromagnetic interference without relying on impedance balance. As verification of the proof-of-concept, a hardware prototype of a scale-down 1 kW ac/dc converter is developed. The experimental results show that the converter can operate in an ultrawide battery terminal voltage range of 220-420 V, with a peak efficiency of 96.35%, and a power density of 28% higher than the traditional two-level converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2023.3324008