ZVS Analysis of Half Bridge LLC-DCX Converter Considering the Influence of Resonant Parameters and Loads

Deng, Guoliang; Sun, Yao; Xu, Guo; Chen, Xiaoying; Xie, Shiming; Shu-tian, Yan; Su, Mei; Liao, Yuefeng

doi:10.1109/ecce44975.2020.9235371

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…This PRM determines the power flow direction by acknowledging which DC port is higher/lower than the other. Figures 10,11,and 12 show the performance of these two PRMs for a load step change and load ramp change. In order to properly evaluate these two PRMs, the idle mode period was set to a fix period.…”

Section: Zoom-inmentioning

confidence: 99%

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

2022

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The bidirectional resonant DC transformer has all the desired features to drive the development of the DC power distribution networks of the future. This power-electronics converter provides galvanic isolation between DC buses, has desired open loop properties, and follows the system's power flow naturally, requiring only a power reversal algorithm to allow a bidirectional operation and smooth transitions. This paper proposes a solution to tackle the power reversal of the DCT with a dynamic algorithm, considering the system behaviour and the power converter characteristics. The proposed algorithm executes the power reversal in few switching periods and removes the DCT losses during no-load condition. Then, using low voltage prototype of DC transformer, experimental results along the paper demonstrate how this power reversal algorithm is applied under various operating conditions.INDEX TERMS LLC converter, DC transformer, DCT, resonant converter, power reversal, power transition.

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Section: Zoom-inmentioning

confidence: 99%

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

2022

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“…In refs. [14][15][16][17], expressions of the resonant current during the dead time were derived, and the ranges of the dead time for ZVS were provided in refs. [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17], expressions of the resonant current during the dead time were derived, and the ranges of the dead time for ZVS were provided in refs. [15][16][17]. However, the parasitic capacitance of the transformer was ignored in these papers.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, refs. [15–17], the expressions for the resonant current and the dead time ranges for ZVS were derived for

f_{\text{s}}

equal to

f_{\text{r}}

, leading to errors in the calculation processes when the two frequencies are not equal.…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE15 Experimental results of the LLC converter with dead times determined by the proposed method for different load conditions: (a) overall waveforms with a t dead of 985 ns and the rated load, (b) details for t dead = 985 ns and the rated load, (c) details for t dead = 985 ns and 50% rated load, and (d) details for t dead = 985 ns and 9% rated load.…”

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confidence: 99%

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An improved time‐domain analytical method for LLC resonant converters and dead time designs for zero‐voltage switching

Jiao

Guo

Wang

et al. 2023

IET Power Electronics

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In this paper, an improved time‐domain analytical method for LLC resonant converters is proposed. Unlike traditional time‐domain analytical methods, the resonant current in the dead time is derived by considering the equivalent capacitances of the switching devices and the transformer. The equivalent output capacitance of the primary‐side switch is calculated by using a two‐segment fitting approach. The equivalent capacitance of the transformer is calculated by using the six‐capacitor model. The current increment method is used to calculate the initial value of the magnetizing current and to determine the numerical calculation conditions for the proposed time‐domain expressions. Finally, the dead time ranges for zero‐voltage switching of the converter are derived based on the improved time‐domain method. Experiments were carried out with a 10 kW LLC resonant converter. The lower limit of the dead time calculated with the proposed method is closer to the experimental results than the values of two conventional methods.

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The ZVS Transition Analysis and Optimization for CLLC-Type Resonant DC Transformer

Cao

Ngo

Dong

et al. 2021

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

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ZVS Analysis of Half Bridge LLC-DCX Converter Considering the Influence of Resonant Parameters and Loads

Cited by 8 publications

References 8 publications

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

An improved time‐domain analytical method for LLC resonant converters and dead time designs for zero‐voltage switching

The ZVS Transition Analysis and Optimization for CLLC-Type Resonant DC Transformer

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