Gyrator-Based Analysis of Resonant Circuits in Inductive Power Transfer Systems

Sohn, Yeong H.; Choi, Byoung Ho; Cho, Gyu‐Hyeong; Rim, Chun T.

doi:10.1109/tpel.2015.2506737

Cited by 53 publications

(14 citation statements)

References 65 publications

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“…LCL/P topology can be regarded as the combination of primary LCL compensation and secondary parallel compensation. As a consequence, the parameter tuning method is given as follows [28]:

ω_{normalS}^{2} = \frac{1}{L_{1} C_{1}} = \frac{1}{L_{P} C_{1}} = \frac{1}{L_{normalS} C_{2}}

where ω S is the system operation angular frequency.…”

Section: Topology Designmentioning

confidence: 99%

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

Yao

Liu

Wang

et al. 2018

IET Power Electronics

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Inductive power transfer (IPT) has attracted a lot of attention in recent 30 years due to its advantages of convenience, safety, reliability and weather proof. This study proposes a modified parameter tuning method for primary inductor-capacitorinductor, secondary parallel (LCL/P) compensation topology, which provides the characteristic of excellent constant current output (CCO). This characteristic is analysed on the basis of inductor-capacitor(LC) and capacitor-inductor (CL) resonant tanks. To lower the voltage stresses over capacitors and current stresses through inductors, the stress-based optimisation is conducted. The sensitivity of CCO characteristic with respect to the normalised deviation of compensation parameters is analysed; therefore, the performance of LCL/P compensated IPT system in practical scenarios can be fully understood. The loosely coupled transformer (LCT) is specially designed since it has a significant impact on system efficiency, component stress, power density etc. An exhaustive search algorithm is employed to find the optimal dimensions of the LCT. A 100 W LCL/P compensated IPT prototype is fabricated. The measured end-to-end efficiency, from DC input to DC output, is as high as 92.8%. The output current only increases by 2.02% when the load decreases by half. All experiment results agree well with the theoretical analysis.

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“…LCL/P topology can be regarded as the combination of primary LCL compensation and secondary parallel compensation. As a consequence, the parameter tuning method is given as follows [28]:

ω_{normalS}^{2} = \frac{1}{L_{1} C_{1}} = \frac{1}{L_{P} C_{1}} = \frac{1}{L_{normalS} C_{2}}

where ω S is the system operation angular frequency.…”

Section: Topology Designmentioning

confidence: 99%

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

Yao

Liu

Wang

et al. 2018

IET Power Electronics

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show abstract

“…2(b)) and a parallel capacitor combined with a series inductor (parallelseries LC, secondary in Fig. 2(b)) can be described by a two-port network with gyrator characteristics [26]. A gyrator is a passive, lossless, linear two-port transformation network in which the output and input currents depend on the input and output voltages, respectively, with respect to its trans-conductance gain G. In circuit theory, gyrators are often used to reflect inductance using capacitance, impedance into admittance, and vice versa [27]- [30].…”

Section: B Equivalent Representations Of Matching Networkmentioning

confidence: 99%

A Network-Based Approach for Modeling Resonant Capacitive Wireless Power Transfer Systems

Abramov¹,

Zeltser

Peretz³

2019

CPSS TPEA

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In this paper, a network-based approach to model capacitive wireless power transfer systems is introduced. The modeling methodology provides insights into the electrical crosscoupling relationships between input and output parameters of the capacitive power transfer (CPT) systems, including the effect of distance and alignment of the coupling plates. It is revealed that, regardless of the circuit complexity or matching network order, the model core can be reduced to a basic gyrator relationship with added coefficients when required, thus obtaining a compact, closed-form relationship between the input and output terminals. The model has been validated through rigorous simulations and experiments; all found to be in excellent agreement with the theoretical predictions under changes of the air-gap, and medium capacitance. To this end, an experimental CPT prototype that operates in the MHz range has been designed and implemented while the transmitter and receiver have been realized by four 170 mm × 170 mm copper plates. In addition, to provide better insight into the capacitive interface under different structures and distances and alignments, the capacitive coupler has been methodically examined through Finite Elements Analysis (FEA) tools Maxwell (Ansys). The results of the FEA have been utilized in the simulation platform to enhance the accuracy of the simulations, accounting for the variable capacitance under variations. Index Terms-Behavioral modeling, capacitive power transfer, capacitive coupling, gyrator, matching networks, two-port network. I. IntroductIon O VER the last few years, capacitive power transfer (CPT) is a rapidly growing technology in the field of wireless power transfer (WPT) [1]-[7]. One of the more attractive advantages of capacitive-based WPT is the avoidance of undesired Eddy currents and electromagnetic interfaces (EMI) that comes with magnetic based WPT methods [8]-[10]. In addition to efficiency improvements, CPT systems are potentially with lower volume and construction complexity [1]-[7]. However, the power transfer capability and efficiency still depend on the distance and alignment between the transmitting and receiving sides, which is an inherent feature of near-field WPT systems [11], [12].

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“…2b) and a parallel capacitor combined with a series inductor (parallel-series LC, Fig. 2b) can be described by a two-port network with gyrator characteristics [45]. A gyrator is a passive, lossless, linear two-port transformation network in which the output and input currents depend on the input and output voltages, respectively, with respect to its transconductance gain G. In circuit theory, gyrators often used to reflect inductance using capacitance, impedance into admittance, and vice versa [46][47][48][49].…”

Section: Equivalent Representations Of Matching Networkmentioning

confidence: 99%

Analysis and behavioural modelling of matching networks for resonant‐operating capacitive wireless power transfer

Abramov

Alonso

Peretz

2019

IET Power Electronics

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This study introduces a two-port network-based behavioural modelling approach for resonant-operated capacitive wireless power transfer (WPT) systems. A simple, generic and unified modelling approach is developed to describe the behaviour of WPT systems, under changes of the source and load circuits, variations of the coupling interface and drifts of the components in the matching networks. The resultant model provides insights into the electrical cross-coupling relationships between input and output parameters of the capacitive power transfer systems, including the effect of distance and alignment of the coupling plates. Regardless of the circuit complexity, it is demonstrated that the model core can be reduced to a basic gyrator relationship with added coefficients when required, thus obtaining a compact, closed-form relationship between the input and output. To provide a simulation framework for capacitive medium variations, a simulation-compatible model of the capacitive coupling using a continuous-time variable capacitor has been constructed. The behavioural model and methodology have been validated through simulations and experiments. A 200 W experimental capacitive WPT prototype has been designed and examined for various air-gaps up to 100 mm at a resonant operation of 1.56 MHz. A very good agreement is obtained between the theoretical predictions, simulations, and experimental results.

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Gyrator-Based Analysis of Resonant Circuits in Inductive Power Transfer Systems

Cited by 53 publications

References 65 publications

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

A Network-Based Approach for Modeling Resonant Capacitive Wireless Power Transfer Systems

Analysis and behavioural modelling of matching networks for resonant‐operating capacitive wireless power transfer

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