Systematic Design of a 100-W 6.78-MHz Wireless Charging Station Covering Multiple Devices and a Large Charging Area

Li, Jie; Qin, Ruiyang; Sun, Jingjing; Costinett, Daniel

doi:10.1109/tpel.2021.3124707

Cited by 18 publications

(4 citation statements)

References 28 publications

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“…Table 1 displays the switching modes in the range (0, 2π) for one cycle following the stabilized operation of the Class DE inverter, where D represents the duty cycle of the PWM signal that controls the MOSFETs. During mode 1 ⃝, Q 1 and Q 2 are turned on, and the current i s (θ) flows positively (setting the flow from point A to point B as positive). During mode 2 ⃝, all MOSFETs are off, so the resonant cavity must be designed to be weakly inductive.…”

Section: Theoretical Description Of Class De Invertermentioning

confidence: 99%

“…In modes 2 ⃝ and 3 ⃝, the bus does not supply energy; instead, the capacitor C S undergoes charging and discharging cycles. Thus, the total current i a is equal to the sum of the currents i Q1 (θ) and i Q4 (θ) flowing on Q 1 and Q 4 in mode 1 ⃝ and mode 4 ⃝. Thus, the DC current can be expressed as the average amount of current i a :…”

Section: Operation Modes Switching Statusmentioning

confidence: 99%

“…Magnetic resonance-based wireless power transfer (WPT) technology is being continuously developed, and it is widely used in electronics, electric vehicles, and other consumer fields. It also plays a vital role in some special charging applications [1][2][3][4][5]. In terms of charging for light rail trains, a coupling mechanism is installed on the rail and the train chassis to obtain stable power transfer for train operation [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Impedance Matching of Class DE Inverter for High Efficiency, Wide Impedance WPT System

Wang,

Li,

Liu

et al. 2024

Electronics

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In high-frequency wireless power transfer (WPT) applications, Class D, E, and F inverters are most widely used. Class DE inverters combine the respective advantages of Class D and Class E inverters. However, the Class DE inverter is sensitive to changes in impedance, which can easily lead to the loss of soft switching characteristics, thereby reducing efficiency. In this paper, an impedance-matching compensation design method is proposed to expand the high-efficiency region of the Class DE inverter by matching impedance and parameters. The effect of the method on the zero-voltage switching (ZVS) characteristic of Class DE inverters is analyzed in detail. The proposed WPT system maintains a constant voltage and zero phase angle by employing PS/PS compensation topology. Theoretical analysis shows that the impedance can be compressed for the design of resonant network impedance, and the method can expand the high-efficiency region with a reasonable choice of parameters to match the phase. Finally, a 500 kHz, 1 kW WPT prototype was constructed with a coupling factor of 0.25–0.4 and a load range of 30–80 Ω. The inverter’s efficiency exceeds 95%, with optimal efficiency reaching 97.3%. The system efficiency is greater than 87%.

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Section: Theoretical Description Of Class De Invertermentioning

confidence: 99%

Section: Operation Modes Switching Statusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Impedance Matching of Class DE Inverter for High Efficiency, Wide Impedance WPT System

Wang,

Li,

Liu

et al. 2024

Electronics

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“…PRU is one of the important keys in WPT, especially for the resonant WPT when it is above the MHz operating frequency. The conventional diode-based full-bridge rectifier is used to regulate the received AC power and some studies connect a DC-DC converter to stepdown the voltage to WPT applications [13][14][15]. A research work using a push-pull active rectifier reached 210 W with 89.3% conversion efficiency using the class-E-based WPT [14] via a 10 cm distance.…”

Section: Introductionmentioning

confidence: 99%

Power Receiving Unit for High-Power Resonant Wireless Power Transfer

Liu,

Tang,

Shieh

et al. 2023

Energies

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A new power receiving unit (PRU) is proposed in this paper for resonant wireless power transfer (WPT), which is characterized by the capability of attracting high power from the power transmitting unit (PTU). The resonant WPT is designed for delivering the electrical power to the PRU attached on an electrical vehicle (EV) chassis 50 cm away from a PTU installed on the ground. The proposed PRU uses only the passive elements such as inductors, diodes, and capacitors, which need no initial power from the EV. It is then applicable for charging a battery to several hundred volts for even a first-time charging battery. For a resonant WPT at a switching frequency of 4 MHz, the proposed PRU behaves as a negative impedance converter (NIC) itself in the subharmonics of 4 MHz. The NIC effect plus the subharmonic oscillation causes an instability current charging the battery connected to the PRU. In this paper, we simulated the PRU and performed the experiment. The experiment demonstrated a battery charging of 150 W from 50 cm away using three D-mode GaN HEMT transistors via the instability current ramp. The power transfer efficiency (PTE) improved as the power delivered to the load (PDL) increased. The peak PTE was 65% in the present findings. The simulation analysis showed that the circuit allowed itself be used to much higher power transfer when it is implemented with more GaN HEMT transistors connected in parallel. The theoretical derivation of the PRU circuit is also used to support both the experimental and simulation results.

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Power Distribution of Multi-load WPT System Based on Active L-type Equivalent Network

Huang,

Hong,

Lin

et al. 2024

Lecture Notes in Electrical Engineering

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Systematic Design of a 100-W 6.78-MHz Wireless Charging Station Covering Multiple Devices and a Large Charging Area

Cited by 18 publications

References 28 publications

A Novel Impedance Matching of Class DE Inverter for High Efficiency, Wide Impedance WPT System

A Novel Impedance Matching of Class DE Inverter for High Efficiency, Wide Impedance WPT System

Power Receiving Unit for High-Power Resonant Wireless Power Transfer

Power Distribution of Multi-load WPT System Based on Active L-type Equivalent Network

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