Digital Implementation of Soft Start-Up and Short-Circuit Protection for High-Frequency LLC Converters With Optimal Trajectory Control (OTC)

Chao, Fei; Lee, Fred C.; Li, Qiang

doi:10.1109/tpel.2016.2631467

Cited by 57 publications

(21 citation statements)

References 24 publications

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“…However, the accuracy is unsatisfying. Other approaches, such as state-plane [10,11] or time-domain analysis [12,13] rely on the exact model of the converter to provide a precise description of a circuit's behavior. Compared with 2 of 17 the FHA-based method, time-domain analysis can obtain a higher accuracy.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

et al. 2018

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As a key factor in the design of a voltage-adjustable LLC resonant converter, frequency regulation range is very important to the optimization of magnetic components and efficiency improvement. This paper presents a novel optimal design method for LLC resonant converters, which can narrow the frequency variation range and ensure high efficiency under the premise of a required gain achievement. A simplified gain model was utilized to simplify the calculation and the expected efficiency was initially set as 96.5%. The restricted area of parameter optimization design can be obtained by taking the intersection of the gain requirement, the efficiency requirement, and three restrictions of ZVS (Zero Voltage Switch). The proposed method was verified by simulation and experiments of a 150 W prototype. The results show that the proposed method can achieve ZVS from full-load to no-load conditions and can reach 1.6 times the normalized voltage gain in the frequency variation range of 18 kHz with a peak efficiency of up to 96.3%. Moreover, the expected efficiency is adjustable, which means a converter with a higher efficiency can be designed. The proposed method can also be used for the design of large-power LLC resonant converters to obtain a wide output voltage range and higher efficiency.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

et al. 2018

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“…Therefore, the switching frequency has to be increased to a very high value for the voltage regulation at light loads. On the other hand, the over‐current protection is also a difficult issue to be solved [24]. The conventional method by directly increasing the switching frequency is quite simple.…”

Section: Configurations Of the Proposed Dtmrcsmentioning

confidence: 99%

Family of DTMRC‐based DC–DC converters with an RZP

Han

Wang

Yang

et al. 2020

IET Power Electronics

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This study presents a novel family of dual-transformer multi-resonant DC-DC converters (DTMRCs) with a resonant zero point (RZP). The limitations of the conventional LLC resonant converter and its fundamental harmonic approximation (FHA) method are firstly discussed. On this basis, a unique RZP is combined with the dual-transformer architecture. As a result, both of the output voltage regulation capability and the over-current protection feature are promoted. Then, an extended describing modelling method is presented to improve the calculative accuracy of the FHA method. Moreover, by means of the appropriate placement of all three resonant frequencies, the fundamental and the third-order harmonic components are employed to transmit active power to the load simultaneously. The zero-voltage soft-switching characteristic is acquired for all the primaryside switches. Meanwhile, the preferable zero-current soft-switching feature is obtained for diodes both at the turn-on and turnoff moments. Therefore, the switching losses are significantly reduced for the proposed converters. Finally, with the employed SiC metal-oxide-semiconductor field-effect transistors, a 500-W half-bridge DTMRC prototype is built as an example, based on the P-type multi-resonant network. The experimental results demonstrate the validity and correctness of the theoretical analyses.

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“…There are some structures or control algorithms in the literature [15], which limit start‐up or switching inrush current of converters [16–18]. Generally, inrush‐current limiters for different applications, such as induction machines [19, 20], power transformers [21, 22], and capacitor banks switching [23–25], can be divided into two major categories: (i) Approaches based on the insertion of initial impedance. (ii) Approaches based on synchronised switching. Series reactor type limiters [26, 27], insertion and bypassing a limiting resistor and/or inductor [28], active switches in the linear region of operation [29–31] and power electronics‐based methods are subsets of the first group.…”

Section: Introductionmentioning

confidence: 99%

Start‐up circuit for an electric vehicle fast charger using SSICL technique and a slow estimator

Tashakor

Arabsalmanabadi

Ghanbari

et al. 2020

IET Generation, Transmission & Distribution

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Digital Implementation of Soft Start-Up and Short-Circuit Protection for High-Frequency LLC Converters With Optimal Trajectory Control (OTC)

Cited by 57 publications

References 24 publications

Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

Family of DTMRC‐based DC–DC converters with an RZP

Start‐up circuit for an electric vehicle fast charger using SSICL technique and a slow estimator

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