Wireless Power Transfer (WPT)
Autonomous underwater vehicles (AUVs) are extensively utilized for underwater resource exploration, requiring inductive power transfer (IPT) systems with large output power to achieve quick charging. However, underwater positioning errors result in significant variations in the coupling coefficient of the IPT system. Moreover, AUVs employ diverse battery types and voltages, exacerbating the issue of decreased transferred power when the coupling coefficient and battery voltage are low, thereby prolonging the AUVs' charging time.
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MatWPT is an innovative software to support designers during the analysis and development of Wireless Power Transfer (WPT) systems. The software, developed as a Matlab toolbox, receives the key system characteristics as inputs, such as compensation topology, operating frequency and desired output power. Then, using evolutionary optimization, provides potential design options for meeting the performance criteria defined by the designer, in terms of output power and efficiency.
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Different countries have various grid voltages, and different electric vehicles (EVs) have different chassis heights. Conventional EV wireless power transfer (WPT) solutions require designing different circuits for various input voltages and using different compensation circuits for different transmission distance classes which hinders the widespread adoption of the WPT technique. To address these two issues, this paper proposes an EV WPT system based on series-parallel inverters. The mathematical model of this system is established, and the expression for output power is derived.
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The traditional wired charging mode requiresautonomous underwater vehicles (AUVs) to be salvaged to the ship for energy replenishment, which cannot work continuously and is complicated to operate. To address this issue, since the battery voltages of AUVs are low, a convenient high-current wireless power transfer (WPT) system is introduced for the AUV batteries with low-voltage, it may cause large losses in the receiving coil and an unbalanced current-sharing issue among the rectifier diodes.
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137 Views
Wireless power transfer (WPT) systems for electric vehicles (EVs) require wide-range voltage gains to satisfy battery charging requirements and coupling coefficient variations. However, existing solutions typically require additional DC-DC converters, or may suffer from discontinuous output voltage and hard switching. To solve these problems, this paper proposes a primary-side hybrid modulation method that can achieve wide-range voltage regulation and zero voltage switching (ZVS) simultaneously.
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125 Views
This paper presents a vehicle side wireless synchronization controller suitable for high-power inductive power transfer (IPT) systems for electric vehicle (EV) wireless charging under stationary and semi-dynamic conditions. The objective of this work is to enable improved functionality, efficiency, and power density of high-power IPT systems under misaligned conditions. An existing 50 kW LCL-LCL tuned IPT system with dual active bridges (DAB) demonstrates the controller’s performance.
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203 Views
The mainstream battery pack voltages of electric vehicles (EVs) range from 200 V to 500 V. Compared with these conventional 400-V battery packs, 800-V EVs have smaller cables, higher charging power, and a longer range. Although existing literature has overcome the drawbacks caused by one or two parameter variations in a 400-V EV WPT system, few works discuss the Z classes, output voltages, and output power levels simultaneously.
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151 Views
It is a video to demo a rectenna to harvest microwave power.
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180 Views
Due to the range of battery capacities in different electric vehicles (EVs), wireless power transfer (WPT) systems need to have a large variation in the output power. Since conventional systems are usually designed for a custom specification, the power and efficiency may be significantly reduced due to the need for interoperability between ground assembly and vehicle assembly with different power ratings. To address this issue this paper proposes a DC-link parallel AC-link series (DPAS) multi-inverter multi-rectifier (MIMR) architecture for high-power WPT systems.
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104 Views
Conventional high-power wireless power transfer (WPT) systems suffer from hard switching, current sharing, and crossing coupling issues when providing a wide-range power supply. To improve the power level and regulation performance, we propose a new resonant inductor integrated-transformer based multi-inverter (RIIT-MI) topology for the high-power WPT system. A flexible power capacity can be achieved by increasing the number of inverters. A wide power regulation range with soft switching can be achieved without adding additional components.
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161 Views