New Insight of Maximum Transferred Power by Matching Capacitance of a Wireless Power Transfer System

Xiao, Chunyan; Liu, Yufeng; Cheng, Dingning; Wei, Kangzheng

doi:10.3390/en10050688

Cited by 17 publications

(5 citation statements)

References 28 publications

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“…A number of research has been devoted to wireless power transfer in recent times. These include use of magnetic resonance coupling [12,13,14,15], electromagnetic inductive coupling [16,17] and capacitive coupling [18]. More importantly, Erol-Kantarci and Mouftah (2014) [19], considering Picocell base Ststions (PBSs) and dedicated Energy Transmitter Towers (ETTs) achieved RF-based WET in LTE-A heterogeneous networks.…”

Section: Figure 1 Li-ion Battery Of a Samsung Cellular Phonementioning

confidence: 99%

Radio Frequency Based Wireless Battery Charging of Cellular Phones

Normanyo

Blewushie

Atatsi

2022

JNTE

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The challenge of regularly charging the battery of cellular phones has brought about new and more convenient ways to realising cellular battery charging. The wireless power platform has been explored for years bringing about many dimensions to its realisation. In this research, developed a wireless charging of Li-Ion battery of a cellular phone using commercial-off-the-shelf components vis-a-vis Radio Frequency (RF) energy. A MAX2623 voltage controlled oscillator was used to generate RF signals at a frequency of 915 MHz. Through a series of amplifier stages, the signal is radiated using a half-wave dipole antenna. The signal is received by a remote receiver module made up of 5 dBi gain half-wave dipole antenna which is impedance matched to a bridge rectifier made of SMS3929 Bridge Quad Schottky low turn-on voltage diodes. The rectified output is received by a EH4205 low voltage booster which amplifies the input into two paralleled MAX 682 charge pumps. The paralleled MAX 682 charge pump delivers a constant output voltage of 5 V DC and current of 500 mA. Within a 4 m radius the receiver module can receive enough power for the realisation of wireless battery charging.

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Section: Figure 1 Li-ion Battery Of a Samsung Cellular Phonementioning

confidence: 99%

Radio Frequency Based Wireless Battery Charging of Cellular Phones

Normanyo

Blewushie

Atatsi

2022

JNTE

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“…In Figure 15, you can see Z 1 , Z 2 , Z 3 , Z 4 and Z 5 and Z 6 which represent a part of circuital impedance, respectively. And the function was established by Equations (7)- (12). The relationship between the output noise energy and the input noise energy in the system is given by transfer function in Equation (13).…”

Section: Analysis For CM Propagation Pathsmentioning

confidence: 99%

“…As for wireless charging for EVs, many researchers pay attention to improving the charging efficiency and electromagnetic compatibility (EMC). Some researchers adopt the method of optimizing the structure of the coupled coil pair, the compensation circuit and pulse width modulation (PWM) control strategy to improve the efficiency of wireless charging [8][9][10][11][12][13]. As for EMC, the two key considerations consist of electromagnetic emission and electromagnetic susceptibility (EMS).…”

Section: Introductionmentioning

confidence: 99%

Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles

et al. 2018

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The large dv/dt and di/dt outputs of power devices in wireless charging system (WCS) in electric vehicles (EVs) always introduce conducted electromagnetic interference (EMI) emissions. This paper proposes a mitigation conducted emission strategy based on transfer function from a direct current fed (DC-fed) WCS for EVs. A complete test for the DC-fed WCS is set up to measure the conducted emission of DC power cables in a frequency range of 150 kHz-108 MHz. An equivalent circuit with high-frequency parasitic parameters for WCS for EV is built based on measurement results to obtain the characteristics of conducted emission from WCS. The transfer functions of differential mode (DM) interference and common mode (CM) interference were established. A judgment method of using transfer functions to determine the dominated interference mode responsible for EMI is proposed. From the comparison of simulation results between CM or DM and CM+DM interference, it can be seen that the CM interference is the dominated interference mode which causes the conducted EMI in WCS in EVs. A strategy of giving priority to the dominated interference mode is proposed for designing the CM interference filter. Finally, the conducted voltage experiment is performed to verify the mitigation conducted emission strategy. The conducted voltage of simulation and experiment is decreased respectively by 21.17 and 21.4 dBµV at resonance frequency 30 MHz. The conduced voltage at frequency range of 150 kHz-108 MHz can be mitigated to below the limit level-3 of CISPR25 standard (GB/T 18655-2010) by adding the CM interference filters.

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“…As we know, the efficiency and output power of the WPT system will be maximized if the system satisfies the optimal impedance matching condition [11]. However, the uncertain parameter variations 2 of 18 will change the impedance characteristics of the transmitter and/or the receiver, and hence break the impedance matching status of the overall WPT system.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

et al. 2018

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Uncertainty commonly exists in the wireless power transfer (WPT) systems for moving objects. To enhance the robustness of the WPT system to uncertain parameter variations, a modified WPT system structure and an interval-based uncertain optimization method are proposed in this paper. The modified WPT system, which includes two Q-type impedance matching networks, can switch between two different operating modes. The interval-based uncertain optimization method is used to improve the robustness of the modified WPT system: First, two interval-based objective functions (mean function and variance function) are defined to evaluate the average performance and the robustness of the system. A double-objective uncertain optimization model for the modified WPT system is built. Second, a bi-level nested optimization algorithm is proposed to find the Pareto optimal solutions of the proposed optimization model. The Pareto fronts are provided to illustrate the tradeoff between the two objectives, and the robust solutions are obtained. Experiments were carried out to verify the theoretical method. The results demonstrated that using the proposed method, the modified WPT system can achieve good robustness when the coupling coefficient, the operating frequency, the load resistance or the load reactance varies over a wide range.

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New Insight of Maximum Transferred Power by Matching Capacitance of a Wireless Power Transfer System

Cited by 17 publications

References 28 publications

Radio Frequency Based Wireless Battery Charging of Cellular Phones

Radio Frequency Based Wireless Battery Charging of Cellular Phones

Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles

Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

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