Bi-Directional CLLC Converter With Synchronous Rectification for Plug-In Electric Vehicles

Zou, Shenli; Lu, Jiangheng; Mallik, Ayan; Khaligh, Alireza

doi:10.1109/tia.2017.2773430

Cited by 134 publications

(45 citation statements)

References 13 publications

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“…However, the output voltage would be overvoltage when the load changed, which would damage SiC MOSFET. Some control methods can be used to avoid output overvoltage [30][31][32]. In this paper, a variable duty cycle modulation is designed in Figure 12.…”

Section: Phase Width Modulation Strategymentioning

confidence: 99%

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Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation

Zhao

2019

Energies

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In this paper, a new auxiliary power supply system of magnetic levitation based on the LLC DC-DC converter is proposed. The switches of the DC-DC converter are SiC MOSFET, which enables high frequency, high temperature, and high power density. For further improving the efficiency of the system and realizing the stability of the output voltage under different load conditions, the digital synchronous rectification (DSR) based on the phase shift control strategy is proposed. The prototype of the LLC DC-DC converter based on SiC MOSFET is implemented, which can realize zero voltage switching (ZVS) and zero current switching (ZCS). Then, the thermal image of DSR is presented, which proves that the power loss of SiC MOSFET with DSR is relatively low. Additionally, the system efficiency among the Si IGBT, SiC MOSFET, and SiC MOSFET with DSR is analyzed and the prototype demonstrates 98% peak efficiency. Finally, simulations, experiments, and data analysis prove the superiority of the proposed DSR strategy for the new auxiliary power supply system of magnetic levitation.

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Section: Phase Width Modulation Strategymentioning

confidence: 99%

“…Moreover, there are few studies on the DSR strategy in high-power applications. Therefore, it is necessary to further study the DSR strategy for the LLC DC-DC converter [26][27][28][29][30][31][32][33].…”

mentioning

confidence: 99%

Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation

Zhao

2019

Energies

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“…For example, when the LLC resonant circuit operates in the reverse mode, it degenerates into a LC resonant circuit, with normalized dc gain below 1. In [6][7][8][9][10][11][12], a symmetric tank structure called CLLLC is proposed, as shown in Figure 2c. Although similar bidirectional voltage gain features are obtained, too many resonant components are used in CLLLC, which increases the volume of the converter and the error of analysis and design.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of High-Efficiency Bidirectional GaN-Based CLLC Resonant Converter

Liu

Wang

et al. 2019

Energies

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A bidirectional CLLC resonant converter (CLLC-BRC) based on GaN transistors is analyzed and designed in this paper. Similar resonant topologies are listed and commented on, with the CLLC topology showing competitiveness in bidirectional energy transmission. The analysis of the aforementioned converter has been provided, including the reveal of resonant frequencies of the CLLC topology and an improved zero-voltage switching (ZVS) condition with operation principles of the reverse mode and relevant parasitic parameters taken into account. The design methodology of the aforementioned converter based on pulse frequency modulation (PFM) is further discussed in detail. A prototype with a rated power of 400 W and a maximal operating frequency that is larger than 0.5 MHz was built to verify the proposed design methodology. The highest conversion efficiency of the prototype was 97.02% in the forward mode, and it was 95.96% in the reverse mode.

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“…The advantage of the primary side LCC compensation network is the constant current source behavior at resonance and a resonant frequency, which is load independent . Consequently, the system can work at a constant switching frequency, and zero voltage switching (ZVS) can be achieved over a wide load range . However for conventional LCL and LCC compensation with the LCT coupling variation, the current in the primary coil remains unchanged; thus, the power transfer is proportional to the square of the coupling factor …”

Section: Introductionmentioning

confidence: 99%

“…8,9 Consequently, the system can work at a constant switching frequency, and zero voltage switching (ZVS) can be achieved over a wide load range. 10 However for conventional LCL and LCC compensation with the LCT coupling variation, the current in the primary coil remains unchanged; thus, the power transfer is proportional to the square of the coupling factor. 5 To maintain the constant output voltage over the range of the LCT coupling variation, the secondary side control is preferred to regulate the power flow, which is usually realized by a cascaded DC-DC converter.…”

Section: Introductionmentioning

confidence: 99%

Design of compensation network with variable inductance for wide variation of coupling coefficient in inductive power transfer

Ðurić

Pajnić

2019

Circuit Theory & Apps

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Summary In this paper, a design of the compensation network with a variable inductor is proposed, considering a wide variation of the coupling coefficient in the inductive power transfer (IPT). The characteristics of the proposed compensation network are analyzed with respect to the variable antenna coupling conditions. The realization of the zero voltage switching (ZVS) and the reactive power demand are discussed through the theoretical deduction and numerical simulation. Influence of the variable inductor on the compensation network characteristics is examined in detail, and the control algorithm for achieving the coupling independent constant output voltage is proposed. Detailed steps to design a prototype fulfilling all performance requirements are given. Verification of the proposed method was carried out on the experimental model. Recorded output voltage variation is within 5% over the wide coupling range, implying a quite well characteristic of the coupling independent voltage output. Experimental results match well with the calculations, validating the rightness of the proposed variable inductor tuning method.

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Bi-Directional CLLC Converter With Synchronous Rectification for Plug-In Electric Vehicles

Cited by 134 publications

References 13 publications

Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation

Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation

Analysis and Design of High-Efficiency Bidirectional GaN-Based CLLC Resonant Converter

Design of compensation network with variable inductance for wide variation of coupling coefficient in inductive power transfer

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