EPE Association: EPE 2025 - DS3j: Contactless (Wireless) Power Supply

EPE 2025 - DS3j: Contactless (Wireless) Power Supply
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 13: Power Supplies and Industry-specific Power Electronics > EPE 2025 - DS3j: Contactless (Wireless) Power Supply

   [return to parent folder]

   A Compact Dual-Band Wireless Power Transfer System based on circular edges with DGS resonators
By Mahya SAMADBEIK, Alireza SIADATAN, Maryam SEPEHRINOUR [View]
[Download]

Abstract: The present study deals with the design of a dual-band wireless power transfer (WPT) system using Defected ground structure (DGS) model resonators. The most important factor will be achieving high conversion efficiency while keeping its structural dimensions small. To improve transmission efficiency and minimize return losses and insensitivity to mismatch between resonators at their resonance frequencies, we introduce a gap in the ground layer. For the proposed system, the transmission power efficiency at frequencies of 330 and 770 MHz is 92.5\% and 84.6\%, respectively, the simulation results from both CST and ADS software are closely aligned. Also, the figure of merit (FoM) derived from the simulation results is 0.78 and 0.72 at respective resonance frequencies.

   A Superconducting Half-Wave Rectifier: Principle and Experiment
By Tianyong GONG, Loïc QUÉVAL [View]
[Download]

Abstract: The superconducting rectifier is a low-power consumption, high-current rectifying device with significant potential for application in AC-DC conversion systems. In this study, we have clarified its operating principle from a circuit perspective. It is demonstrated that the rectification function in a superconducting rectifier is attributed to its time-varying resistance, which is controlled by external sources. An AC field-controlled superconducting half-wave rectifier was developed. By constructing an experimental platform, we measured the rectified voltage and current of the rectifier under various operating conditions. The rectifier successfully converted an AC current into a 34 A DC current, powering a superconducting coil load.

   Comparison of Resonant Converters for High-Power Inductive Wireless Power Transfer
By Diego CASTILLO, Pablo BRICEÑO, Antonio SANCHEZ-SQUELLA, Hafte ADHENA, Alan WATSON [View]
[Download]

Abstract: This paper focuses on the Modular Multilevel Converter (MMC) with integrated magnetics foran Inductive Power Transfer (IPT) system applied to a 1 MW high-speed train. The MMC achieves zero-voltage switching (ZVS) through duty cycle pattern modulation, and an improved capacitor voltage balancing algorithm to enhance reliability against inter-leg imbalances is presented.A comparison between the MMC and Cascaded Hbridge (CHB) with integrated transformers was studied. While the CHB converter excels in efficiency and performance, the MMC is particularly suited for handling higher currents. The study presents an IPT system with five H-bridged modules for the CHB with integrated transformers and five sub-modules per arm for the MMC. Maximum efficiency exceeds 94\% at 1 MW, highlighting the strengths of both topologies in high-power applications.

   PWM-Less Utility Frequency Output Capacitive Wireless Power Transfer System
By Masaya TOKURIKI, Keisuke KUSAKA, Kazumi FURUHASHI [View]
[Download]

Abstract: This paper presents a capacitive wireless power transfer (CPT) system designed to provide utility frequency output, specifically targeting onboard chargers (OBCs) for electric vehicles (EVs) in automated parking systems. The system functions by directly injecting high frequency into a fully rectified sinusoidal waveform, thus removing the need for DC link capacitors. On the secondary side, the waveform is converted back into a full-wave rectified sinusoid using a diode rectifier and filter. The unfolder on the secondary side provides the utility frequency output without pulse width modulation (PWM). This topology reduces switching losses and supports system miniaturization. Experimental results from a prototype show AC voltage output at a utility frequency of 50 Hz. The analysis reveals a total harmonic distortion (THD) of 4.10\% for the input current and 5.43\% for the output current.

EPE 2025 - DS3j: Contactless (Wireless) Power Supply
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 13: Power Supplies and Industry-specific Power Electronics > EPE 2025 - DS3j: Contactless (Wireless) Power Supply
	[return to parent folder]

	A Compact Dual-Band Wireless Power Transfer System based on circular edges with DGS resonators By Mahya SAMADBEIK, Alireza SIADATAN, Maryam SEPEHRINOUR	[View] [Download]
Abstract: The present study deals with the design of a dual-band wireless power transfer (WPT) system using Defected ground structure (DGS) model resonators. The most important factor will be achieving high conversion efficiency while keeping its structural dimensions small. To improve transmission efficiency and minimize return losses and insensitivity to mismatch between resonators at their resonance frequencies, we introduce a gap in the ground layer. For the proposed system, the transmission power efficiency at frequencies of 330 and 770 MHz is 92.5\% and 84.6\%, respectively, the simulation results from both CST and ADS software are closely aligned. Also, the figure of merit (FoM) derived from the simulation results is 0.78 and 0.72 at respective resonance frequencies.

	A Superconducting Half-Wave Rectifier: Principle and Experiment By Tianyong GONG, Loïc QUÉVAL	[View] [Download]
Abstract: The superconducting rectifier is a low-power consumption, high-current rectifying device with significant potential for application in AC-DC conversion systems. In this study, we have clarified its operating principle from a circuit perspective. It is demonstrated that the rectification function in a superconducting rectifier is attributed to its time-varying resistance, which is controlled by external sources. An AC field-controlled superconducting half-wave rectifier was developed. By constructing an experimental platform, we measured the rectified voltage and current of the rectifier under various operating conditions. The rectifier successfully converted an AC current into a 34 A DC current, powering a superconducting coil load.

	Comparison of Resonant Converters for High-Power Inductive Wireless Power Transfer By Diego CASTILLO, Pablo BRICEÑO, Antonio SANCHEZ-SQUELLA, Hafte ADHENA, Alan WATSON	[View] [Download]
Abstract: This paper focuses on the Modular Multilevel Converter (MMC) with integrated magnetics foran Inductive Power Transfer (IPT) system applied to a 1 MW high-speed train. The MMC achieves zero-voltage switching (ZVS) through duty cycle pattern modulation, and an improved capacitor voltage balancing algorithm to enhance reliability against inter-leg imbalances is presented.A comparison between the MMC and Cascaded Hbridge (CHB) with integrated transformers was studied. While the CHB converter excels in efficiency and performance, the MMC is particularly suited for handling higher currents. The study presents an IPT system with five H-bridged modules for the CHB with integrated transformers and five sub-modules per arm for the MMC. Maximum efficiency exceeds 94\% at 1 MW, highlighting the strengths of both topologies in high-power applications.

	PWM-Less Utility Frequency Output Capacitive Wireless Power Transfer System By Masaya TOKURIKI, Keisuke KUSAKA, Kazumi FURUHASHI	[View] [Download]
Abstract: This paper presents a capacitive wireless power transfer (CPT) system designed to provide utility frequency output, specifically targeting onboard chargers (OBCs) for electric vehicles (EVs) in automated parking systems. The system functions by directly injecting high frequency into a fully rectified sinusoidal waveform, thus removing the need for DC link capacitors. On the secondary side, the waveform is converted back into a full-wave rectified sinusoid using a diode rectifier and filter. The unfolder on the secondary side provides the utility frequency output without pulse width modulation (PWM). This topology reduces switching losses and supports system miniaturization. Experimental results from a prototype show AC voltage output at a utility frequency of 50 Hz. The analysis reveals a total harmonic distortion (THD) of 4.10\% for the input current and 5.43\% for the output current.