Re-analysis on ZVS Condition for LLC Converter

Song, Haibin; Xu, Daofei; Zhang, Alpha J.

doi:10.1109/apec42165.2021.9487400

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Figure 8 shows how the proposed model compares with other common methods for predicting the ZVS current. The constant output capacitance method is widely used to determine the ZVS current and uses the value of the output capacitance listed in the datasheet of the device, usually at the rated voltage of the device [13], [20]. This method entirely disregards the effects of the non-linearity of the output capacitance and is therefore the least precise.…”

Section: A Evaluation Of Proposed Modelmentioning

confidence: 99%

Accurate Prediction of Incomplete Zero-Voltage Switching Dynamics and Losses

Zäch,

Beczkowski,

Jørgensen

et al. 2023

2023 IEEE 10th Workshop on Wide Bandgap Power Devices &Amp; Applications (WiPDA)

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The switching losses occurring between full softswitching and hard-switching are described inadequately, and previous attempts of quantifying incomplete zero-voltage switching losses are topology specific and not applicable for any general half-bridge circuit. The ability to quantify these losses is crucial to optimize the converter efficiency across a wide operating range. This paper proposes a general method for accurately estimating the incomplete zero-voltage switching dynamics and losses in halfbridge converters, including the non-linear output capacitance of the semiconductors. The charge balance during the switching transition period is solved to determine the depth of incomplete zero-voltage switching, which can be used to predict the switching losses. The method is verified experimentally, and is shown to be able to predict the depth of incomplete zero-voltage switching accurately, which can be used to calculate the related losses.

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Section: A Evaluation Of Proposed Modelmentioning

confidence: 99%

Accurate Prediction of Incomplete Zero-Voltage Switching Dynamics and Losses

Zäch,

Beczkowski,

Jørgensen

et al. 2023

2023 IEEE 10th Workshop on Wide Bandgap Power Devices &Amp; Applications (WiPDA)

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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%

“…FIGURE17 Experimental results of the LLC converter with dead times determined by conventional method 2 for different load conditions: (a) overall waveforms with a t dead of 1115 ns and the rated load, (b) details for t dead = 1115 ns and the rated load, (c) details for t dead = 1115 ns and 50% rated load, and (d) details for t dead = 1115 ns and 9% rated load.…”

mentioning

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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