Half-Bridge Diode-Clamped Four-Level LLC Resonant Converter with Pulse-Amplitude-Modulation for Railway Applications

Song, Min-Sup; Lee, Jae-Bum; Jung, Hosung; Kim, Hyungchul

doi:10.1007/s42835-023-01545-5

Cited by 2 publications

(2 citation statements)

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“…On the bright side, the voltage balancing algorithm is already integrated into the implementation of the PWM switching pattern, eliminating the need for separate voltage balancing efforts. Moreover, the issue of the large number of clamp diodes in the FB topology can be mitigated by applying the HB method, reducing it by half [35].…”

Section: Advantages Of the Proposed Convertersmentioning

confidence: 99%

“…Meanwhile, it has been proven that the MNRV DPWM method for FB topology can be implemented as a symmetric control method of two half-bridges (HBs) constituting the FB [35]. In other words, the FB topology can be easily replaced with two HBs by aligning the symmetry point where the polarity of the command voltage changes and the boundary point where the switching area is divided.…”

Section: Introductionmentioning

confidence: 99%

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Full-Bridge Diode-Clamped Four-Level Symmetric Switching Converter

Song,

Kim,

Lee

2023

IEEE Access

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In this paper, we propose a novel full-bridge (FB) diode-clamped four-level symmetric switching converter. Multi-neighboring reference vector discontinuous PWM (MNRV DPWM) for FB topology was implemented through symmetric half-bridge (HB)-based control using an offset voltage addition method. A diode-clamped four-level symmetrical switching circuit with pulse-amplitude modulation (PAM) was proposed and its working principle was explained in detail. Voltage gain, duty loss factor, and zero-voltage-switching (ZVS) condition were derived by analyzing the steady-state operating characteristics of the proposed converter. The required input and output capacitance values were also calculated explicitly. The voltages across the series-connected input DC-link capacitors were well balanced and the output voltage was controlled in a simple linear manner by PAM. The proposed method has the advantage of reducing circulating current compared to the existing phase-shift method because there is an additional powering period. The effectiveness of the proposed converter was verified through simulation and prototype experiments. The power conversion efficiency exceeded 91.44% at an output power (PO) of 250W or higher, with a peak efficiency of 95.23% achieved at PO=750W.

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Section: Advantages Of the Proposed Convertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%