Capacitive Power Transfer for Rotor Field Current in Synchronous Machines

Ludois, Daniel C.; Reed, Justin; Hanson, K. L.

doi:10.1109/tpel.2012.2191160

Cited by 155 publications

(59 citation statements)

References 19 publications

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“…Besides, in industrial applications with a stable gap separation distance, such as rotary joints [11,12] or rail tracers, most circuitry can be placed separately from the coupling structure and thus the required volume of the coupling structure with a given handling power is of major concern. Despite the existing duality between two different wireless power technologies, I-WPT and C-WPT, energy coupling mechanism is very different as shown in Fig.…”

Section: Further Discussionmentioning

confidence: 99%

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Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

Choi¹

2016

Journal of Electrical Engineering and Technology

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-A capacitive wireless power transfer (C-WPT) system uses an electric field to transmit power through a physical isolation barrier which forms a pair of ac link capacitors between the metal plates. However, the physical dimension and low dielectric constant of the interface medium severely limit the effective link capacitance to a level comparable to the main switch output capacitance of the transmitting circuit, which thus narrows the soft-switching range in the light load condition. Moreover, by fundamental limit analysis, it can be proved that such a low link capacitance increases operating frequency and capacitor voltage stress in the full load condition. In order to handle these problems, this paper investigates optimal design of double matching transformer networks for C-WPT. Using mathematical analysis with fundamental harmonic approximation, a design guideline is presented to avoid unnecessarily high frequency operation, to suppress the voltage stress on the link capacitors, and to achieve wide ZVS range even with low link capacitance. Simulation and hardware implementation are performed on a 5-W prototype system equipped with a 256-pF link capacitance and a 200-pF switch output capacitance. Results show that the proposed scheme ensures zero-voltage-switching from full load to 10% load, and the switching frequency and the link capacitor voltage stress are kept below 250 kHz and 452 V, respectively, in the full load condition.

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Section: Further Discussionmentioning

confidence: 99%

“…To calculate the ZVS condition, the equivalent linear capacitance of C sw =400 pF was pre-calculated by (11) using the datasheet value of the main MOSFET switch (FQPF20N60, 60 V/15 A). As was predicted in (17), the capacitance ratio, κ, is as small as 1.6 and thus appropriate design of N 1 and N 2 was important for ZVS operation.…”

Section: Power Stage Designmentioning

confidence: 99%

Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

Choi¹

2016

Journal of Electrical Engineering and Technology

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“…However, the CPT systems have many important benefits that they are cheaper to implement, less vulnerable to metal barriers and electromagnetic interference (EMI), and more flexible with alignment than IPT systems [12]. Thanks to these advantages, the CPT systems have been adopted to various applications, such as biomedical microsystem [5], robot [13], and portable respiratory devices [14], rotating device [15,16] and so forth.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems

2017

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Growth of the Internet of Things (IoT) spurs need for new ways of delivering power. Wireless power transfer (WPT) has come into the spotlight from both academia and industry as a promising way to power the IoT devices. As one of the well-known WPT techniques, the capacitive power transfer (CPT) has the merit of low electromagnetic radiation and amenability of combined power and data transfer over a capacitive interface. However, applying the CPT to the IoT devices is still challenging in reality. One of the major issues is due to the small capacitance of the capacitive interface, which results in low efficiency of the power transfer. To tackle this problem, we present a new step-up single-switch quasi-resonant (SSQR) converter for the CPT system. To enhance the CPT efficiency, the proposed converter is designed to operate at low frequency and drive small current into the capacitive interfaces. In addition, by eliminating resistor-capacitor-diode (RCD) snubber in the converter, we reduce the implementation cost of the CPT system. Based on intensive experimental work with a CPT system prototype that supports maximum 50 W (100 V/0.5 A) power transfer, we demonstrate the functional correctness of the converter that achieves up to 93% efficiency.

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“…Therefore, it is necessary to develop the contactless power transfer method for rotary machinery with high reliability to reduce the risk and disaster while operating under hard environment. The contactless power supply techniques can be divided into two ways: the inductive power transfer techniques [2][3] and the capacitive power transfer techniques [4][5]. Figure 1 shows the illustrations of these two different contactless power transfer ways for rotary machinery.…”

Section: Introductionmentioning

confidence: 99%

Design of an Improved Type Rotary Inductive Coupling Structure for Rotatable Contactless Power Transfer System

Lee

Chen

Huang

2015

MATEC Web of Conferences

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Abstract. This paper is aimed at analyzing the rotary inductive coupling structure of contactless rotary transformer. The main feature of the proposed rotatable contactless power transfer system is which winding is coaxial-interlayered for improving the magnetic coupling capability. There is no ferrite core used in the secondary-side of the rotary inductive coupling structure, this helps to ease the exerted force that is stress by the secondary-side on spindle. In order to verify the feasibility of the proposed contactless power transfer system for rotary applications, an inductive powered rotary machinery and the control system have been integrated. The experimental results show that the maximum power transfer efficiency of the proposed rotary inductive coupling structure is about 94.8%. The maximum output power received in the load end is 1030 W with transmission efficiency of 88%.

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Capacitive Power Transfer for Rotor Field Current in Synchronous Machines

Cited by 155 publications

References 19 publications

Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems

Design of an Improved Type Rotary Inductive Coupling Structure for Rotatable Contactless Power Transfer System

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