Optimal Control Strategy of CLLC Bidirectional Resonant Converter under Light Load

Bu, Han; Guan, Jiangshan; Zhang, Caochao; Li, Zenghui

doi:10.1109/ifeea57288.2022.10038171

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…To address the issue of load short-circuit protection in LCL topologies [17,18], external auxiliary circuits, such as notch filters, have been employed as a solution. In addition, optimal trajectory methods are used in [19,20]. Nevertheless, these components increase the size and weight of the system, resulting in a bulky design that adds to the overall cost of operation [21].…”

Section: Related Workmentioning

confidence: 99%

Resonant DC/DC Converters: Investigating Phase-Shift Control

Reddy,

Bhaskar,

Subramaniam

2023

Energies

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The paper presents an innovative approach to control the voltage of an LCL-T type converter at the output side against variation at input and load ports, utilizing a fixed-frequency phase-shift control scheme. The examination of the converter is performed employing a Fourier series method that takes into account the effect of n-harmonics. To assure high-frequency switches with a zero-voltage switching (ZVS) technique, the lagging pf mode is utilized. PSIM simulations were used to investigate the performance of a 300 W converter. With the minimal input voltage, all switches turn on with ZVS for all loading conditions, whereas the ZVS strategy loses by two switches when the voltage at the input is highest. The power loss calculations of each component are performed and presented in a pie chart. The findings of the experiments are presented and verified with theoretical and simulation results. It is demonstrated that for both input voltage and load fluctuations, a minor adjustment in pulse width is sufficient to keep the output voltage constant.

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Section: Related Workmentioning

confidence: 99%

Resonant DC/DC Converters: Investigating Phase-Shift Control

Reddy,

Bhaskar,

Subramaniam

2023

Energies

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“…In this mode, the CLLC resonant converter can attain zero voltage switching (ZVS) for the switch devices in the chopping unit, ensuring efficient operation [9,10]. Similarly, under light load conditions, the converter applies PFM to adjust the operating frequency to be higher than the resonant frequency, which enables the converter to function in the over-resonant mode to achieve a low voltage gain [11,12]. This mode ensures ZVS for the switch devices in the chopping unit and zero current switching (ZCS) for the switch devices in the rectification unit of the converter.…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Transition Algorithm Integrated with Hybrid Modulation for CLLC Resonant Converters

Qian,

Lin,

Tong

et al. 2023

Energies

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The CLLC resonant converter is a widely used bidirectional power converter known for its high energy transfer efficiency. To extend its operating range, the converter often employs a hybrid modulation strategy, which is valued for its simplicity and efficiency. However, at the critical transition point between pulse frequency modulation and phase-shift modulation, instability in the output can be observed due to repetitive and unnecessary mode changes caused by noise. In order to address this issue, this paper introduces a dynamic transition algorithm integrated with hybrid modulation. This approach adaptively updates the controller parameters to mitigate oscillations resulting from improper initial parameter settings. Additionally, it incorporates error analysis and hysteresis comparison to prevent false triggers caused by noise, enabling intelligent mode adjustments. Finally, a 1 kW prototype is designed to conduct experiments, demonstrating an approximately 50% improvement in dynamic performance when the converter operates with the dynamic transition algorithm.

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Optimal Control Strategy of CLLC Bidirectional Resonant Converter under Light Load

Cited by 2 publications

References 11 publications

Resonant DC/DC Converters: Investigating Phase-Shift Control

Resonant DC/DC Converters: Investigating Phase-Shift Control

A Dynamic Transition Algorithm Integrated with Hybrid Modulation for CLLC Resonant Converters

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