Multiple Harmonics Analysis for Variable Frequency Asymmetrical Pulsewidth-Modulated Wireless Power Transfer Systems

Fang, Yaoran; Pong, Bryan Man Hay

doi:10.1109/tie.2018.2850015

Cited by 33 publications

(6 citation statements)

References 24 publications

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“…In strong coupling scenarios, where frequency splitting occurs, the frequency control technique stabilizes the voltage conversion ratio against load impedance variations [30,31] by adjusting the operating frequency. Moreover, multiple harmonic analysis can be employed to evaluate the performance of WPT systems under conditions of strong coupling or heavy loads [32][33][34]. In contrast, biomedical implants utilize a weak coupling inductive link and operate under milliamp-level load currents [1,33], effectively mitigating frequency splitting.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, multiple harmonic analysis can be employed to evaluate the performance of WPT systems under conditions of strong coupling or heavy loads [32][33][34]. In contrast, biomedical implants utilize a weak coupling inductive link and operate under milliamp-level load currents [1,33], effectively mitigating frequency splitting. As a result, the coupling mode theory with fundamental harmonic frequency analysis suffices for achieving precision [33] [34].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Power Transfer Efficiency in Biomedical Implants: A Comparative Analysis of SS and SP Inductive Link Topologies

Xia,

Mao,

et al. 2024

IEEE Trans. Power Electron.

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Inductive link intended to deliver energy to implantable devices is recently becoming a popular method. To improve link efficiency, the compensated capacitors are adopted to resonate at the same frequency with the power transfer frequency on both sides. However, there is limited research on link efficiency and output power concerning quality factors, the selection between serial-parallel (SP) and serial-serial (SS) topologies, as well as coil design. This study delves into the efficiency of SP and SS topologies using rigorous mathematical derivations with reflected impedance models in terms of quality factors. It introduces a selection factor to help choose topology based on link efficiency. Results show that SS is better when the load quality factor (QL) is lower than the selection factor, and vice versa. The study also examines the performance limits of both topologies concerning frequency, inductance, and load impedance. It proposes a specific QL for maximum efficiency and a coil design procedure considering specific absorption rate (SAR) limitations. By leveraging simulations and the design procedure, the study manufactures a pair of flexible coils for biomedical use. The designed link achieves a 62.99% efficiency under a 500 Ω load, with an overall efficiency of 46.96% including a passive rectifier.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing Power Transfer Efficiency in Biomedical Implants: A Comparative Analysis of SS and SP Inductive Link Topologies

Xia,

Mao,

et al. 2024

IEEE Trans. Power Electron.

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“…To cope with such nuisances, previous studies have assessed different resonant compensation circuits [8][9][10][11]. It was noted that the occurrence of mismatched parameters in the resonant architecture would induce current harmonics [12][13], which was followed by the evaluation of generation source with signal analysis [13][14][15][16]. Later on, the development of analytical methods and corresponding strategies were subsequently reported.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Wireless Power Transfer for Automated Guided Vehicles Considering Disturbance Suppression

Lee

Huang

2023

IEEE Access

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This article proposes an enhanced wireless power transfer (WPT) for automated guided vehicles (AGVs) considering disturbance suppression. The study is motivated because existent resonant methods may induce unexpected disturbances, affecting the efficiency of power transfer and disturbing the voltage gain. This paper is, therefore, focused on the suppression of disturbances as well as the realization of an effective wireless power transmission. Moreover, by considering that the output voltage is often affected by misaligned charging, the system design has included the gain-frequency control along with an early detection of coil misalignment. It is anticipated that through this proposed approach, the constant-voltage output can be achieved while the efficiency of power transfer is improved as well. To validate the practicality of this approach, the hardware prototype is tested with a significant decrement of disturbance interference during the wireless power transmission, supporting the feasibility of the method for AGV charging applications.INDEX TERMS Wireless power transfer, disturbance suppression, automated guided vehicle.

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“…1 illustrates their typical power process and control schemes. The power control strategies suitable for the resonant power converter in IPTs are categorized as; pulse amplitude modulation (PAM) [1] [2], pulse width modulation (PWM) [3]- [6], single or dual phase shift (SPS, DPS) modulation [7] [8], pulse-frequency-modulation (PFM) [9] [10], and pulse density modulation (PDM) [13]- [20]. The existing power control strategies are briefly summarized in TABLE I.…”

Section: Introductionmentioning

confidence: 99%

Load-Adaptive Resonant Frequency-Tuned $\Delta$–$\Sigma$ Pulse Density Modulation for Class-D ZVS High-Frequency Inverter-Based Inductive Wireless Power Transfer

Mishima

Lai

2022

IEEE J. Emerg. Sel. Top. Ind. Electron.

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This paper presents a resonant frequency tuning (RFT) Delta-Sigma (Δ -Σ) signal-transformed pulse density modulation (PDM) class-D converter for inductive power transfer (IPT) applications. The proposed power controller provides a load-adaptive pulse modulation by tuning a zero phase angle (ZPA) and peak-power frequency, i.e. resonant frequency in the primary-side high frequency inverter. The switching frequency is regulated in accordance with the variations of the load and coupling co-efficient between the transmitting (Tx) and receiving (Rx) coils. The output power is controlled by the RFT-ΔΣ PDM which is effective for reducing a low frequency oscillation (subharmonics), thereby the high efficiency power transmission can attain. The essential performances of the proposed IPT power controller are demonstrated in experiment of a 400W -500kHz of prototype, whereby the feasibility is clarified from a practical point of view.

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Multiple Harmonics Analysis for Variable Frequency Asymmetrical Pulsewidth-Modulated Wireless Power Transfer Systems

Cited by 33 publications

References 24 publications

Optimizing Power Transfer Efficiency in Biomedical Implants: A Comparative Analysis of SS and SP Inductive Link Topologies

Optimizing Power Transfer Efficiency in Biomedical Implants: A Comparative Analysis of SS and SP Inductive Link Topologies

Enhancement of Wireless Power Transfer for Automated Guided Vehicles Considering Disturbance Suppression

Load-Adaptive Resonant Frequency-Tuned $\Delta$–$\Sigma$ Pulse Density Modulation for Class-D ZVS High-Frequency Inverter-Based Inductive Wireless Power Transfer

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