A contactless power transfer system with capacitively coupled matrix pad
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Capacitively Coupled Power Transfer (CCPT) technology has been proposed recently as an alternate contactless power transfer solution. This paper proposes a CCPT system with a matrix type of primary charging pad to maintain desired output voltage regardless of the positioning and alignment of the pickup. The capacitive coupling and system performance are analyzed in details, and a new algorithm is developed to control the proposed system. A prototype CCPT system using readily available aluminium sheets as the capacitive coupling pad is developed to prove the concept design. The system demonstrates that 0.7–2.5W output power can be obtained under coupling variation.Keywords:
Pickup
Capacitive coupling
Matrix (chemical analysis)
The resistance and capacitance of a typical multipoint contact interface have been used to assess the impact on high-frequency signal integrity. In the past, it has been shown how fully degraded interfaces could still provide acceptable performance for signal transfers at high data rates. In the case of fully degraded contacts, signals were shown to transfer by capacitive coupling and wave propagation. This paper focuses on the critical parameters of a capacitive-coupled interface. Moreover, the physics of the contact interface is related to contacts that rely on capacitive (as opposed to metallic) coupling and electronic tunneling. These results help define the physics and design requirements for capacitive coupling. In addition, critical performance parameters such as real contact area, film thickness, and the nature of dielectric films are defined for high-frequency signal propagation. This paper provides a contrast between the requirements for high-frequency signal transfer using capacitive coupling and electron tunneling versus traditional metallic contact.
Capacitive coupling
SIGNAL (programming language)
Interface (matter)
Electrical contacts
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HF RFID transponders with capacitive coupling were made. They have two electrodes for capacitive coupling instead of a coil for magnetic induction coupling. Prototypes of capacitive coupling transponder communicate via a medium composed of conductors and/or dielectrics normally existing around us. In HF band, since the human body is also a conductor and a dielectric, RFID communication can be carried out through the human body. Transponders with capacitive coupling have the possibility to widen the application of RFID and realize more natural and intuitive applications. In this paper, the measurement results of the antennas specially designed for capacitive coupling are reported. Characteristics unique to capacitive coupling type RFID on human body are also described. In particular, the influence of individual differences and the result of examination about correspondence to RFID regulations indispensable for practical application are introduced.
Capacitive coupling
Transponder (aeronautics)
Inductive coupling
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After the concept of electromagnetic fields was summarized by scientists, a new technique called capacitive coupling was invented. This technique is a way to transmit signals. The front-end circuit and back-end circuit may be connected together by a capacitive coupling to eliminate physical contact. Such a capacitive coupling minimizes the possibility of poor physical contact between two circuits due to vibration, corrosion and the like. Thus, the reliability and stability of data between the two circuits are improved. It can be applied to many practical aspects. At the same time, the application of capacitive coupling electrode has its limitations. The limitations come from the coupling area and distance, electrode materials and other influencing factors. There are many problems in the application process. Scientists have come up with a number of solutions. This paper summarizes the information about capacitive coupling electrode. Then this paper lists some factors that influence capacitive coupling as well as some practical applications of it.
Capacitive coupling
Inductive coupling
Direct coupling
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Capacitive coupling occurs in the presence of the electric field on any metal conductor. The purpose of this paper is to emphasize the capacitive coupling which appears if the voltages difference between the circuits is large and to present a method of reducing capacitive coupling.
Capacitive coupling
Direct coupling
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The resistance and capacitance of a typical multi-point contact interface has been used to assess the impact on high frequency signal integrity. In the past it was shown how fully degraded interfaces can still provide acceptable performance for high data rate signal transfers. In the case of fully degraded contacts, signals were shown to transfer by capacitive coupling and wave propagation. This paper focuses on the critical parameters of a capacitive coupled interface. Moreover, the physics of the contact interface is related to contacts that rely on capacitive (as opposed to metallic) coupling and electronic tunneling. These results help define the physics and design requirements for capacitive coupling. In addition, critical performance parameters such as real contact area, film thickness and the nature of dielectric films are defined for high frequency signal propagation. This paper provides a contrast between the requirements for high frequency signal transfer using capacitive coupling and electron tunneling versus traditional metallic contact.
Capacitive coupling
SIGNAL (programming language)
Interface (matter)
Electrical contacts
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Inductive Power Transfer (IPT) technology can realize energy transfer across relatively large air gap with the aid of high frequency magnetic coupling. To obtain a large power output, multiple pickups are usually utilized to satisfy power requirement. However, due to the influence of reflecting impedance, it is not easy to control the output power of each pickup to reach desired the power requirement. This paper proposes a cooperative control method. It's realized by adding a Buck converter at the secondary side to regulate output power of each pickup. A cooperative control algorithm is proposed based on prior estimation of the power transfer capability of each pickup. A weight factor is developed to allocate required power for each pickup. The cooperative control method is simple and easy for implementation. Finally, experimental results verify this cooperative control method.
Pickup
Buck converter
Inductive coupling
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The pickup and delivery problem (PDP) asks to find a set of vehicles that serve a given set of requests with the minimum travel cost, where each request consists of a pickup point, a delivery point and a load (the quantity to be delivered from the pickup point to the delivery point). In the pickup and delivery problem with transfer (PDPT), for each request, its load picked up at the pickup point is allowed to be dropped at a transshipment point before it is picked up again and delivered to the delivery point by another vehicle. This paper analyzes the maximum travel cost that can be saved by introducing a transshipment point to the pickup and delivery problem (PDP). We show that the bounds are in proportion to square root of the number of cycles in an optimal PDPT solution and also square root of the number of requests. We furthermore present an instance that the bound is the tight for a special case.
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Transshipment (information security)
Square root
Square (algebra)
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This paper deals with coupling of electromagnetic fields to wire, namely capacitive coupling. First, it discusses skin effect and how the resistivity changes with frequency. The use of ferrite filters is explained in regard to interference suppression. Capacitive coupling clamp, a device used for measuring the coupled electromagnetic interference to the wire is explained, and its coupling to RG-213/U, RG-58A/U as well as twisted pair are measured.
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Inductive coupling
Direct coupling
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Capacitive electrodes have been studied as an alternative to gel electrodes, as they allow measurement of biopotentials without conductive contact with the patient. However, because the skin interface is not as precisely defined as with gel electrodes, this could lead to signal deformation and misdiagnoses. Thus, measurement of a capacitive coupling of the electrodes may allow to draw conclusions about the applicability of such systems. In addition, combining capacitive biosignal sensing with an impedance measurement unit may enable bioimpedance measurements, from which additional information on the hydration status can be extracted. A prototype system is introduced which measures impedance over capacitive electrodes in parallel with biopotential measurements. Also presented are the first results on characterization of the skin electrode coupling achieved with the system.
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Biosignal
SIGNAL (programming language)
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