Notice of Removal: Quality factor and topology analysis of the series-parallel combined resonant circuit-based wireless power transfer system

Kim, Jin-Guk; Wei, Guo; Zhu, Chunbo; Rim, Chang-Hyon

doi:10.1109/itec-ap.2017.8080817

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Energies 2022, 15, 4944 5 of 18 Kim et al (2017) showed that the Q factor for the circuit is the ratio of the energy in the energy-storing elements to the dissipation of the entire topology, multiplied by the angular frequency [11]. The relation equation for the Q factor is expressed as Q = ω × E stored P loss (11) According to Kim et al (2021) [4], the circuit Q factor for the series resonant circuit can be derived by…”

Section: Methodsmentioning

confidence: 99%

Performance Estimation: CCL WPT Topologies with Helical Coils

Chen¹,

Hung

2022

Energies

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The radius of the coil, the number of turns of the windings, and the parasitic resistances of energy-storing elements affect the performances of wireless power transfer systems. We aimed to study the effects of coil parameters on a wireless power transfer system with the capacitor–capacitor–coupling coil (CCL)-based circuit using numerical simulations. The power transfer system topologies, including series–CCL (S–CCL), CCL–S, and CCL–CCL, were studied vis-à-vis coil parameters. The helical coil and the system topologies were modeled using MATLAB, and the performances of the topologies were examined in comparison to the series–series (S–S) topology. The variables used in the simulations included the radius and number of turns, the parasitic resistance that was merged in the impedance, and the reactance of energy-storing elements. Subsequently, the performances of the topologies were estimated by numerical simulations under several circumstances. The simulation results showed that the parasitic resistance of the coupling coil affects the performances of the topologies directly. The coupling coils with smaller geometries are beneficial to power transfer in the wireless power transfer system and may further contribute to miniaturization.

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Section: Methodsmentioning

confidence: 99%

Performance Estimation: CCL WPT Topologies with Helical Coils

Chen¹,

Hung

2022

Energies

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“…In addition, Q in Equation ( 20) represents the quality factor for the circuit of the entire system. According to a previous study [18], the definition for the quality factor of the system circuit is Equation (21). Differing from the Q S , the Q here represents the quality factor as far as the entire system is concerned, while Q S is only a quality factor for the coil on the Rx circuit.…”

Section: Lcc Series-compensated Topology and Effect Of Temperaturementioning

confidence: 99%

Improving LCC Series-Based Wireless Power Transfer System Output Power at High Temperature

Chen¹,

Hung

2021

Electronics

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Adding a core to a coupling coil can improve transmission efficiency. However, the added core causes the self-inductance of the coupling coil to increase at a high temperature due to the temperature-sensitive property of the core material’s permeability. The self-inductance increases, causing the resonance frequency to shift down, thereby decreasing the output power. The 3 dB bandwidth of the system can learn of the correspondence between the output power and the resonance frequency. In order to make sure that the output power does not excessively decrease at a high temperature, this study employs a simulation for the LCC-S-based wireless power transfer system. Adding a minor resistance to shift down the lower cutoff frequency ensures that the resonance frequency yielded by the temperature rise can be higher than the lower cutoff frequency, making the output power higher than half of the maximum. Then, an adjustment on the compensation capacitances on the resonant circuit elevates the output power more. The outcomes are consistent with the prediction. Adding the core to the coupling coil improves transmission efficiency; increasing the bandwidth of the system excessively decreases the output power decline at a high temperature for the temperature-sensitive core material permeability.

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“…|S 21 | in the lower band is greater than in the higher band. It might be because the current directions in L 1 and L 1 are the same in lower band, while they are reversal in higher band [16], which cause the field to increase in lower band and decrease in higher band. Though the measured |S 21 | is not good enough, 49.14% PTE at 6.78 MHz and 37.21% PTE at 13.56 MHz are obtained.…”

Section: Experiments and Verificationmentioning

confidence: 99%

A Novel Dual-Band Scheme for Magnetic Resonant Wireless Power Transfer

Ding¹,

Yu²,

Lin³

2018

PIER Letters

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In this paper, a novel dual-band scheme is proposed and analyzed for dual-band magnetic resonant wireless power transfer. The scheme consists of a novel resonant coil structure for dualband resonance and a coupling loop for dual-band impedance matching. Circuit-based analysis and experiments verify that our scheme can achieve dual-band power transfer easily and effectively, with its dual-band reflection coefficient lower than −18 dB and transmission efficiency over 37.21% at a distance of 20 cm at 6.78 MHz and 13.56 MHz.

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Notice of Removal: Quality factor and topology analysis of the series-parallel combined resonant circuit-based wireless power transfer system

Cited by 5 publications

References 10 publications

Performance Estimation: CCL WPT Topologies with Helical Coils

Performance Estimation: CCL WPT Topologies with Helical Coils

Improving LCC Series-Based Wireless Power Transfer System Output Power at High Temperature

A Novel Dual-Band Scheme for Magnetic Resonant Wireless Power Transfer

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