Study on CCL circuit-based WPT systems in consideration of parasitic resistances of circuit elements

Kim, Jin-Guk; Kim, Man-Ho; Ko, Myong-Son; Ro, Kwang-Chol; Jon, Chung-Guk

doi:10.1007/s00202-021-01292-8

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The estimated result obtained in the study by Kim et al (2021) [4] employing the varieties of the coupling air gap indicated that each topology has a different performance at the air gap, assuming that the operating frequency is fixed and parasitic resistance in elements is constant. The simulation for studying the performances of the CCL-based WPT system topologies was conducted following the process mentioned in the previous section.…”

Section: Resultsmentioning

confidence: 97%

“…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%

“…The advantage of the CCL circuit is that its circuit quality factor (Q factor) can be adjusted by the ratio between the series and shunt capacitances; the current flowing through the coupling coil is twice that of the power source when both series and shunt capacitors are identical [3]. Kim et al (2021) estimated the performances of WPT system topologies with CCL circuits [4] based on a fixed operating frequency and a specific parasitic resistance of energy-storing elements. The transmitting power and the power transfer efficiency of various CCL-based WPT system topologies were compared by changing the coupling air gap, while [5] showed that the magnitude of mutual inductance between two coupling coils changes with the coupling air gap.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 97%