Determining the variable inductance range for an LCL wireless power pick-up

Hsu, Jhih-Da; Hu, Aiguo Patrick

doi:10.1109/edssc.2007.4450169

Cited by 17 publications

(9 citation statements)

References 7 publications

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“…Various solutions have been proposed in the previous literature. One is dynamic tuning of reactive elements in either the primary or the secondary compensation network through variable inductors [14][15][16], switchable capacitor bank [9], or transistor-controlled variable capacitor [17], Energies 2018, 11, 2653 2 of 16…”

Section: Introductionmentioning

confidence: 99%

“…Especially when it occurs to the frequency bifurcation region, the power transfer capability and efficiency can deteriorate rapidly at the original resonant frequency [2,13].Various solutions have been proposed in the previous literature. One is dynamic tuning of reactive elements in either the primary or the secondary compensation network through variable inductors [14][15][16], switchable capacitor bank [9], or transistor-controlled variable capacitor [17], Energies 2018, 11, 2653 2 of 16respectively. This method aims to keep the ZVS frequency fixed under coupling variation, although it needs more switching devices, passive components, and even a complicated control unit.…”

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confidence: 99%

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An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System

Zeng

Xiong

et al. 2018

Energies

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In the inductive power transfer (IPT) system, it is recommended to drive the resonant inverter in zero-voltage switching (ZVS) or zero-current switching (ZCS) operation to reduce switching losses, especially in dynamic applications with variable couplings. This paper proposes an improved autonomous current-fed push-pull parallel-resonant inverter, which not only realizes the ZVS operation by tracking the zero phase angle (ZPA) frequency, but also improves the output power and overall efficiency in a wide range by reducing gate losses and switching losses. The ZPA frequencies characteristic of the parallel-parallel resonant circuit in both bifurcation and bifurcation-free regions is derived and verified by theory and experiments, and the comparative experimental results demonstrate that the improved inverter can significantly increase the output power from 7.68 W to 8.74 W and has an overall efficiency ranging from 63.5% to 72.5% compared with the traditional inverter at a 2 cm coil distance. Furthermore, with a 2-fold input voltage (24 V), the improved inverter can achieve an approximate 4-fold output power of 38.9 W and overall efficiency of 83.6% at a 2 cm coil distance.Keywords: inductive power transfer (IPT); frequency bifurcation; current-fed push-pull; resonant inverter; wireless power transfer IntroductionInductive power transfer (IPT) technology [1], characterized by convenience and safety, has many potential applications in portable devices [2], wireless sensor networks (WSNs) [3], implant medical devices (IMDs) [4][5][6][7], and electrical vehicles [8][9][10]. In general, it is recommended to drive the primary-side inverter of IPT systems at zero phase angle (ZPA) operation in order to minimize the volt-amp (VA) rating of the source supply. Moreover, the resonant inverter can achieve zero-voltage switching (ZVS) or zero-current switching (ZCS) operation with less switching losses and electromagnetic interference (EMI) at ZPA or a similar condition [11][12][13]. However, it is often a great challenge to maintain ZVS or ZCS operation with variable couplings, caused by nonconstant coil distances, misalignment, shape deformation, or metal object proximity. Especially when it occurs to the frequency bifurcation region, the power transfer capability and efficiency can deteriorate rapidly at the original resonant frequency [2,13].Various solutions have been proposed in the previous literature. One is dynamic tuning of reactive elements in either the primary or the secondary compensation network through variable inductors [14][15][16], switchable capacitor bank [9], or transistor-controlled variable capacitor [17], Energies 2018, 11, 2653 2 of 16respectively. This method aims to keep the ZVS frequency fixed under coupling variation, although it needs more switching devices, passive components, and even a complicated control unit. Moreover, another common method is directly adjusting the inverter frequency to the new ZVS frequency as the magnetic coupling changes. For instance, in [18], the authors present a clo...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System

Zeng

Xiong

et al. 2018

Energies

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“…Another work in [38] assumes that all the receivers coupled to the transmitter are perfectly tuned and studies the effect of tuning at the transmitter. On the other hand, employing LCL compensation at the receiver side as proposed in [16] and [39] has already reported the sensitivity of the output voltage to variations in the compensation components. It has been shown that the sensitivity is a function of the quality factor Q, which clearly needs to be designed at low value in order to avoid the losses in the system due to high-Q mistuned receiver.…”

Section: Comparison With Other Solutions In the Literaturementioning

confidence: 99%

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Saad

Alarcón

2018

Energies

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Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of WPT have been reasonably enhanced by resonating the transmitter and receiver coils at a common frequency. Nevertheless, matching between resonance in the transmitter and receiver is quite cumbersome, particularly in single-transmitter multi-receiver systems. The resonance frequency in transmitter and receiver tank circuits has to be perfectly matched, otherwise power transfer capability is greatly degraded. This paper discusses the mistuning effect of parallel-compensated receivers, and thereof a novel dynamic frequency tuning method and related circuit topology and control is proposed and characterized in the system application. The proposed method is based on the concept of switch-mode gyrator emulating variable lossless inductors oriented to enable self-tunability in WPT receivers.

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“…In [17,24,25] a similar system was investigated. The main difference is that a centralized, single reactor was used.…”

Section: System With Active Frequency Stabilizationmentioning

confidence: 99%

Resonant frequency stabilization technique in series-series contactless energy transfer systems

Marcinek¹,

Hołub²,

Kalisiak³

et al. 2017

Archives of Electrical Engineering

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Determining the variable inductance range for an LCL wireless power pick-up

Cited by 17 publications

References 7 publications

An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System

An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Resonant frequency stabilization technique in series-series contactless energy transfer systems

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