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Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis

Author

Listed:
  • Kiran Kumar Geddam

    (School of Electrical Engineering, Vellore Institute of Technology, Vellore 632014, India)

  • Elangovan Devaraj

    (TIFAC-CORE, School of Electrical Engineering, Vellore Institute of Technology, Vellore 632014, India)

Abstract

The inductor inductor capacitor (LLC) resonant topology has become more popular for deployment in high power density and high-efficiency power converter applications due to its ability to maintain zero voltage switching (ZVS) over a wider input voltage range. Due to their ease of operation and acceptable accuracy, frequency domain-related analytical methods using fundamental harmonic approximation (FHA) have been frequently utilized for resonant converters. However, when the switching frequency is far from the resonant frequency, the circuit currents contain a large number of harmonics, which cannot be ignored. Therefore, the FHA is incapable of guiding the design when the LLC converter is used to operate in a wide input voltage range applications due to its inaccuracy. As a result, a precise LLC converter model is needed. Time domain analysis is a precise analytical approach for obtaining converter attributes, which supports in the optimal sizing of LLC converters. This work strives to give a precise and an approximation-free time domain analysis for the exact modeling of high-frequency resonant converters. A complete mathematical analysis for an LLC resonant converter operating in discontinuous conduction mode (DCM)—i.e., the boost mode of operation below resonance—is presented in this paper. The proposed technique can confirm that the converter operates in PO mode throughout its working range; in addition, for primary MOSFET switches, it guarantees the ZVS and zero current switching (ZCS) for the secondary rectifier. As a function of frequency, load, and other circuit parameters, closed-form solutions are developed for the converter’s tank root mean square (RMS) current, peak stress, tank capacitor voltage, voltage gain, and zero voltage switching angle. Finally, an 8 KW LLC resonant converter is built in the hardware-in-loop (HIL) testing method on RT-LAB OP-5700 to endorse the theoretical study.

Suggested Citation

  • Kiran Kumar Geddam & Elangovan Devaraj, 2022. "Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis," Energies, MDPI, vol. 15(10), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3634-:d:816538
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    References listed on IDEAS

    as
    1. Manuel Escudero & Matteo-Alessandro Kutschak & Francesco Pulsinelli & Noel Rodriguez & Diego Pedro Morales, 2021. "On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters," Energies, MDPI, vol. 14(18), pages 1-23, September.
    2. Qianfan Zhou & Yang Liu & Zongjian Li & Zhixing He, 2022. "A Coupled-Inductor Interleaved LLC Resonant Converter for Wide Operation Range," Energies, MDPI, vol. 15(1), pages 1-21, January.
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    Cited by:

    1. Wei Zheng & Cong Hu & Bin Zhao & Xiaobao Su & Gang Wang & Xiaowan Hou, 2022. "Design for a Four-Stage DC/DC High-Voltage Converter with High Precision and a Small Ripple," Energies, MDPI, vol. 16(1), pages 1-12, December.

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