Power Delivery and Leakage Field Control Using an Adaptive Phased Array Wireless Power System

Waters, Benjamin H.; Mahoney, Brody J.; Ranganathan, Vaishnavi; Smith, Joshua R.

doi:10.1109/tpel.2015.2406673

Cited by 83 publications

(41 citation statements)

References 24 publications

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“…Very recently, another work was accepted for publication, which also uses multiple transmit coils, and examines the possibility of combining their fields at up to 2 receivers [33]. While the work demonstrates the potential of multi-user charging, it presents an optimal solution only for a single receiver, and uses brute force exploration to determine the optimal solution for two receivers.…”

Section: Related Workmentioning

confidence: 99%

Wireless Power Hotspot that Charges All of Your Devices

Shi

Kabelac

Katabi

et al. 2015

Proceedings of the 21st Annual International Conference on Mobile Computing and Networking

105

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Each year, consumers carry an increasing number of gadgets on their person: mobile phones, tablets, smartwatches, etc. As a result, users must remember to recharge each device, every day. Wireless charging promises to free users from this burden, allowing devices to remain permanently unplugged. Today's wireless charging, however, is either limited to a single device, or is highly cumbersome, requiring the user to remove all of her wearable and handheld gadgets and place them on a charging pad.This paper introduces MultiSpot, a new wireless charging technology that can charge multiple devices, even as the user is wearing them or carrying them in her pocket. A MultiSpot charger acts as an access point for wireless power. When a user enters the vicinity of the MultiSpot charger, all of her gadgets start to charge automatically. We have prototyped MultiSpot and evaluated it using off-theshelf mobile phones, smartwatches, and tablets. Our results show that MultiSpot can charge 6 devices at distances of up to 50 cm.

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Section: Related Workmentioning

confidence: 99%

Wireless Power Hotspot that Charges All of Your Devices

Shi

Kabelac

Katabi

et al. 2015

Proceedings of the 21st Annual International Conference on Mobile Computing and Networking

105

View full text Add to dashboard Cite

show abstract

“…Using an array of TXs to implement WPT systems has recently been adopted for achieving better efficiency and range in near field WPT [3] [4]. In such multi-TX cases, the magnitude and phase of TXs are swept to obtain constructive and destructive interference for location-selectable power delivery.…”

Section: Theorymentioning

confidence: 99%

Localization of receivers using phased-array wireless power transfer systems

Ranganathan

Waters

Smith

2015

2015 IEEE Wireless Power Transfer Conference (WPTC)

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Wireless battery charging has been incorporated into an increasing number of commercial electronics with power requirements ranging from a few milliwatts to several hundred watts. With this growing number of deployed devices, there is a necessity to quickly locate and charge them individually. Conventional localization techniques either require intelligence and extra hardware or are limited to merely detecting the presence of an object and not its position. In the proposed localization technique, we use two wireless power transmitters (TX) operating at the the same frequency. The phase difference between the two TXs can be controlled. The forward/reflected signals are measured from each TX and are used to accurately localize the receiver in a two dimensional space. This system does not require additional hardware on the TX or RX side. The entire detection process can be confined to the transmitter firmware. We also formulate a simple localization parameter using the reflected signals to prove the concept of localization.

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“…In practice, the power inverter can be implemented in several ways. For example, a highly-efficient switched-mode class-E power amplifier is used to drive each transmit coil [7], [8] due to its simplicity and higher output power at the same supply voltage, as compared with the classical bridge-type class-D amplifier [9]. In [10], the power inverter is actually implemented as a highspeed low-power amplifier because of its flexibility to change the amplitudes and phases of the voltages being applied to the transmit coils.…”

Section: Introductionmentioning

confidence: 99%

Buck-Boost Single-Inductor Multiple-Output High-Frequency Inverters for Medium-Power Wireless Power Transfer

Lee

Jin

Tan

et al. 2019

IEEE Trans. Power Electron.

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 Abstract-In this paper, a non-isolated buck-boost singleinductor multiple-output (SIMO) DC-AC inverter for driving multiple independent high-frequency AC outputs of medium power, is proposed. Compared with traditional bridge-type inverters, the proposed buck-boost SIMO inverter achieves (i) a smaller component count, (ii) fully independent power control of its outputs, (iii) better scalability in increasing the number of AC output channels, and (iv) higher power efficiency. Operating in pseudocontinuous conduction mode (PCCM), the rated power of each output channel of this inverter can be high while attaining zero cross-regulation. The scalability factor of the proposed inverter is formally investigated and the theoretical maximum number of AC outputs is analytically derived. The targeted application of this SIMO-based inverter is for driving multiple transmitter coils to realize versatile multi-device medium-power wireless power transfer. A hardware prototype of a single-inductor threeoutput (SITO) buck-boost inverter delivering a medium power of 8.4 W per output channel has been constructed. It is experimentally verified that precise and independent current regulation of individual transmitter coil is achievable with the proposed inverter.

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Power Delivery and Leakage Field Control Using an Adaptive Phased Array Wireless Power System

Cited by 83 publications

References 24 publications

Wireless Power Hotspot that Charges All of Your Devices

Wireless Power Hotspot that Charges All of Your Devices

Localization of receivers using phased-array wireless power transfer systems

Buck-Boost Single-Inductor Multiple-Output High-Frequency Inverters for Medium-Power Wireless Power Transfer

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