Design-Oriented Comprehensive Time-Domain Model for <i>CLLC</i> Class Isolated Bidirectional DC-DC Converter for Various Operation Modes

Sun, Jiangtao; Yuan, Liqiang; Gu, Qing; Duan, Renzhi; Lu, Zixian; Zhao, Zhengming

doi:10.1109/tpel.2019.2938312

Cited by 44 publications

(7 citation statements)

References 25 publications

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“…Due to the complex hybrid control methods, the voltage gain of the CLLC converter comprises both AC gain (resonant part) and DC gain (SSSA part), and the overall gain of the CLLC is expressed as Equation (6).…”

Section: Bidirectional Voltage Gain Analysismentioning

confidence: 99%

On‐board charger applications: A new hybrid control strategy for bidirectional CLLC resonant converter

Shi,

Tang,

Davari

2024

Circuit Theory & Apps

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This paper proposes a new hybrid control strategy to solve the problem of bidirectional wide voltage range regulation in CLLC converters. On the (LLC) side (G2V direction), the SSSA control method is employed for voltage boost, combined with bus voltage and burst control to achieve wide voltage regulation. On the (C) side (V2G direction), the SSSA and full/half‐bridge mode switching control are used to achieve V2G direction wide voltage regulation. This hybrid control strategy also enables high conversion efficiency in both directions without the need for additional components to reduce the converter power density. This is particularly suitable for OBC applications with strict requirements for converter volume and weight. A detailed analysis with mathematical derivation, hybrid control strategy, and converter operation principles is introduced in this paper. The following subchapters supplement the converter voltage gain, soft switching implementation conditions, and design considerations. Finally, the feasibility of the proposed control strategy was verified through an experimental prototype with an input voltage ranging from 340 to 430 V to an output voltage ranging from 225 to 450 V and bidirectional rated power of 6.6/3.3 kW. This prototype achieved a maximum conversion efficiency of 97.7% in the G2V direction and 97.1% in the V2G direction.

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Section: Bidirectional Voltage Gain Analysismentioning

confidence: 99%

On‐board charger applications: A new hybrid control strategy for bidirectional CLLC resonant converter

Shi,

Tang,

Davari

2024

Circuit Theory & Apps

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“…Magnetizing inductance is included in CLC and CLLC networks, and another inductor is usually added in the CLLC network to make the topology symmetrical. The DAB converters with CLC or CLLC network were discussed from the aspects of operation principle, modeling and control, ZVS range extension, reactive power reduction, and so on [311]- [316].…”

Section: ) Clc/cllc Networkmentioning

confidence: 99%

Review of Dual-Active-Bridge Converters With Topological Modifications

Sha

et al. 2023

IEEE Trans. Power Electron.

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“…Referring to (11)(12), the cumulative power input accounting for the series connected voltage sources signifying summation of k harmonic components can be written as:…”

Section: Frequency Domain Gha Based Equivalent Circuitmentioning

confidence: 99%

Parasitic Component Inclusive Optimum Phase-Frequency Contour Enabled Synchronous Rectification of Asymmetric CLLC Resonant Converter

Chandwani

Mallik

Aktruk

2023

IEEE Open J. Power Electron.

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With an objective to reduce the switching losses in a bidirectional resonant CLLC DC/DC converter for electric vehicle (EV) charging applications, this paper presents an elaborate frequency dependent general harmonic approximation (GHA) based secondary side turnoff current minimization technique by investigating the optimum operating point to achieve synchronous rectification (SR). Formulation of an accurate all-inclusive gain model is presented, specifically focusing on effect of parasitic components on the resultant gain-frequency trend, backed with thorough experimental validation. Further, meticulous modeling of the GHA based state equations is presented to obtain a contour of feasible operational frequencies and corresponding phase shifts to ascertain accurate SR operation with a multi-dimensional optimization technique to ensure reduced switching losses. In addition to that, to precisely characterize the resonant tank equivalent circuit, stressing on its effect on SR phase calculation, a detailed 3D finite element analysis (FEA) based R-L-C modelling of the employed high frequency planar transformer (HFPT) is explained. To validate and benchmark the performance of the proposed gain model while ensuring accurate SR operation, a 1kW all-GaN based CLLC experimental prototype is developed for a resonant frequency of 500kHz, with a power density of 106 W/inch 3 . Experimental waveforms at corner conditions are presented for a wide-gain bidirectional operation, portraying a peak converter efficiency of 98.49%.

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Design-Oriented Comprehensive Time-Domain Model for CLLC Class Isolated Bidirectional DC-DC Converter for Various Operation Modes

Cited by 44 publications

References 25 publications

On‐board charger applications: A new hybrid control strategy for bidirectional CLLC resonant converter

On‐board charger applications: A new hybrid control strategy for bidirectional CLLC resonant converter

Review of Dual-Active-Bridge Converters With Topological Modifications

Parasitic Component Inclusive Optimum Phase-Frequency Contour Enabled Synchronous Rectification of Asymmetric CLLC Resonant Converter

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