Fixed frequency control of LCL-T resonant power converter with capacitive output filter

Reddy, G. Vijaya Bhaskar; Nagendrappa, H.

doi:10.1109/cera.2017.8343392

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…The cost and size of a converter can be impacted by its control scheme. The authors introduce a novel investigation into a phase-shifted-gating (PSG)-regulated LCL-T converter, utilizing fundamental harmonic approximation (FHA) [31,32] to analyze its performance. This analysis is a unique contribution, as it provides a new approach to optimize converter designs.…”

Section: Related Workmentioning

confidence: 99%

“…The study proposes the utilization of the Fourier series (FS) method in examining the performance of a fixed-frequency phase-shift controlled LCL-T converter. Unlike the fundamental harmonic approximation (FHA) method [32], the FS approach considers multiple harmonic components of voltage and current waveforms. This results in a more precise estimation of the converter's performance and reduces the impact of load variations on its behavior.…”

Section: Research Contributionmentioning

confidence: 99%

“…A Fourier-series (FS)-based method [35] is employed to analyze the steady-steady behavior of the LCL-T resonant converter. This approach considers n-harmonic components of voltages and current waveforms unlike the fundamental harmonic approximation (FHA) method [32,33]. This makes the performance prediction of the converter at reduced load more accurate and provides more efficient results than the FHA analysis method.…”

Section: Steady-state Analysis Using Fourier Seriesmentioning

confidence: 99%

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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%

Section: Research Contributionmentioning

confidence: 99%

Section: Steady-state Analysis Using Fourier Seriesmentioning

confidence: 99%

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Resonant DC/DC Converters: Investigating Phase-Shift Control

Reddy,

Bhaskar,

Subramaniam

2023

Energies

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“…Actually, the constant current output characteristics of LCL converters are limited into a small frequency range near the resonance point [8,9]. Parameter variations as well as the input voltage fluctuation affect the output current [13][14][15][16][17]. In order to solve this problem, the quality factor of the circuit is studied and optimized to extend the frequency range as possible for achieving a constant current output [15].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on current‐type high frequency resonant power converter based on magnetic energy recovery switch

Cheng

Jiang

Chen

2022

IET Power Electronics

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LCL resonant converters have been widely used to get a constant current output. This paper proposes an LCL resonant converter based on the magnetic energy recovery switch (MERS), which adjusts the output current of the converter by controlling the paralleled equivalent capacitance, as responding to the parameter errors or input voltage disturbance. Firstly, based on the equivalent model of the LCL resonant converter, the effect of variable capacitive impedance on the output current characteristics of the converter is analysed. Then the topological structure of MERS is introduced and its working principle as a controllable capacitive impedance controller is further explained. On this basis, the operating characteristics and soft switching characteristics of the proposed topology in each complete working cycle are analysed in detail. By controlling the phase shift angle between the output voltage of bridge and the fundamental component of MERS voltage, the equivalent capacitance of the MERS is changed, and the resonant frequency of the converter is accordingly adjusted to accurately compensate the output current against the input voltage disturbance. Finally, the effectiveness and feasibility of the MERS applied to the LCL resonant converter are verified by simulation and experiments. Besides, its operating characteristics are analysed and evaluated.

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