Bidirectional H8 AC–DC Topology Combining Advantages of Both Diode-Clamped and Flying-Capacitor Three-Level Converters

Chen, Siyuan; Yu, Wensong; Wang, Dakai

doi:10.1109/jestpe.2021.3088390

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…The high-frequency transformer takes the role of the line-frequency transformer, and the intermediate electrolytic capacitors used in a traditional two-stage power conversion system are no longer required. With the increase of voltage level and power level, some diode, fly-across capacitor clamps and cascaded multilevel converters have been widely studied [7]. Compared with two-level converters, the three-level converters have the advantages of low switching transistor voltage stress, smooth waveform, small filter inductance, and wide gain range [8].…”

Section: Figure 2 Structure Of On-board Charging Systemmentioning

confidence: 99%

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Research on Bidirectional On-Board Charging System Based on Three-Phase Wye-Wye Connected CLLLC Resonant Converter

Zhou,

Huang,

Zheng

2023

IEEE Access

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The traditional on-board charging system can only realize the one-way transmission of electric energy from the grid to the power battery. To address this issue, this paper proposes a bidirectional on-board charging system based on a three-phase wye-wye connected CLLLC resonant converter. It adopts a two-stage structure, the front-stage is a bidirectional totem pole converter and the rear-stage is a threephase wye-wye connected CLLLC resonant converter. Based on the grid characteristics, the working principle of the front-stage converter is analyzed, the equivalent circuit model of the rear-stage converter is derived using fundamental wave analysis, and the voltage gain, impedance characteristics and zero voltage turn-on conditions are analyzed. The parameters of input inductor, DC bus capacitance and resonant network are calculated according to the design specifications of the bidirectional on-board charging system. The control strategy of bidirectional vehicle charging system is studied. The input current and input voltage are kept in the same phase by establishing the small signal circuit model of the front-stage bidirectional totem pole converter. The rear-stage three-phase wye-wye connected CLLLC resonant converter adopts pulse frequency modulation to realize constant voltage and constant current output of the charging system. Simulation software was used to simulate the bidirectional on-board charging system, and a 3.3 kW prototype was trial-produced according to the main circuit parameters. Simulation and experimental results verify the correctness of the design of the bidirectional on-board charging system.INDEX TERMS Bidirectional on-board charging system, resonant converter, three-phase wye-wye connected, totem pole converter.

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Section: Figure 2 Structure Of On-board Charging Systemmentioning

confidence: 99%

“…According to the equivalent circuit model, the transfer function G(s) of the converter can be found as in (7). ( )…”

Section: ) Voltage Gain Analysismentioning

confidence: 99%