An Active-Rectifier-Based Maximum Efficiency Tracking Method Using an Additional Measurement Coil for Wireless Power Transfer

Nowadays, work on Wireless Power Transfer (WPT) systems with dual active bridges is attracting great attention due to their low conduction losses, power regulation, load transformation and reactance compensation. However, in these studies limitations such as overall analysis, design and realization techniques of the system were not considered properly. To address the aforementioned issues, this paper presents a detailed analysis, design and realization of a Series-Series (SS) WPT system with dual active bridges, which will improve the overall performance. Three independent Phase Angles (PAs) have been analyzed and designed in this study, one PA on the primary side and the other two PAs on the secondary side. This Multiple Degrees of Phase Control (MDPC) method can achieve additional reactance compensation, load transformation and output regulation simultaneously. To realize the proposed method in practice, key implementation techniques have been investigated in detail, including additional reactance estimation, mutual inductance estimation, phase detection and synchronization. The feasibility and effectiveness of the proposed system is verified through simulation and experimental results.

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“…Thus, the corresponding voltage (V 1 or V 2 ) is zero. More details about this commutation can be found in [21]:…”

Section: Equivalent Impedance Derivationmentioning

confidence: 99%

“…Thus, the corresponding voltage (V1 or V2) is zero. More details about this commutation can be found in [21]: Since the voltage drop across R1 is small, the above equation becomes true. The SS WPT system maintains the output current, i.e., I2 remains unchanged despite load variation or secondary PC.…”

Section: Equivalent Impedance Derivationmentioning

confidence: 99%

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

et al. 2017

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“…Gallium nitride (GaN) devices are used in [12], [15], [18] to reduce switching losses on the Tx side. Synchronous rectifiers, typically used in high power applications [23], [24], address the conduction losses on the Rx side in [3], [7], [13]. This work combines these two advantages on the Rx side with a synchronous rectifier based on GaN devices, fulfills the AirFuel standard [2] and addresses the specification in table I.…”

Section: Introductionmentioning

confidence: 99%

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

Jensen

Spliid

Hertel

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standards, AirFuel and Qi, exist to support compatibility between devices. This work is focusing on the AirFuel standard, as it is operating at a higher frequency (6.78 MHz), than the Qi standard, and therefore allows smaller passive components, including the coupling coils. Whereas gallium-nitride (GaN) devices are being widely used on the transmitter (Tx) side, this work uses low voltage GaN transistors on the receiver (Rx) side to allow synchronous rectification and soft switching, thereby achieving high efficiency. After analyzing adequate Class-DE rectifier topologies, a Class-DE full-bridge 5 W rectifier using 15 V GaN transistors are designed and implemented. The experimental results show an efficiency above 80 % over a wide operating range and a peak efficiency of 89 %, at an arbitrary alignment of Tx and Rx coils with 3 cm distance between them.

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“…Active rectifiers are initially put forward to reduce the conduction losses of the diode rectifier and transfer the power bi-directionally [12][13][14][15][16][17][18][19]. Recently, Phase Control (PC) method is introduced to regulate resonant currents [20][21][22][23][24][25], which can further reduce the energy consumed by parasitic resistances.…”

Section: Introductionmentioning

confidence: 99%

“…Active rectifiers proposed for WPT systems can be classified into three categories: (i) full bridge rectifier with four switches; (ii) semi-bridgeless rectifier with two switches; and (iii) single-switch rectifier. Full active bridge rectifiers are used in various applications [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Four Metal-Oxide- 2…”

Section: Introductionmentioning

confidence: 99%

A Novel Single-switch Phase Controlled Wireless Power Transfer System

et al. 2018

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Battery charging is a fundamental application of Wireless Power Transfer (WPT) systems that requires effective implementation of Constant Current (CC) and Constant Voltage (CV) power conduction modes. DC-DC converters used in WPT systems utilize large inductors and capacitors that increase the size and volume of the system in addition to causing higher DC losses. This work proposes a novel single-switch active rectifier for phase controlled WPT systems that is smaller in volume and weight as compared to conventional WPT topologies. The proposed method simplifies the control scheme using improved Digital Phase Control (DPC) and Analog Phase Control (APC) to realize the CC and CV power transfer modes. Furthermore, it prevents forward voltage losses in Silicon Carbide (SiC) switches and shoot through states with improved switching patterns. Simulation studies and experimental results are added to verify the effectiveness of the proposed methodology.

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An Active-Rectifier-Based Maximum Efficiency Tracking Method Using an Additional Measurement Coil for Wireless Power Transfer

Cited by 270 publications

References 26 publications

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

A Novel Single-switch Phase Controlled Wireless Power Transfer System

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