Design of a contactless power charger for a functional jacket

Lü, Yan; Cheng, Ka Wai Eric; Ding, Kai; Kwok, Kin Wing

doi:10.1002/cta.789

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…Similar AC methods for modeling electrical magnetic coupling using equivalent circuits can be found in [7] and [8]. However, we encountered a problem that the AC current appears being induced in the field circuit.…”

Section: Introductionmentioning

confidence: 94%

“…We initially considered the AC method by using a separate DC source being connected to its field coil together with an AC source supplied into the machine's armature. Similar AC methods for modeling electrical magnetic coupling using equivalent circuits can be found in [7] and [8]. However, we encountered a problem that the AC current appears being induced in the field circuit.…”

Section: Introductionmentioning

confidence: 94%

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Developing measuring inductance strategies on a direct current machine using a DC source with magnetic saturation

Cui

Gale

2015

Circuit Theory & Apps

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SUMMARYThis article describes a novel measuring inductance strategy on direct current (DC) machines. Measuring self-inductance and mutual-inductance in rotating machines is always a very challenging task over a few decades. A significant challenge in modeling electric machines is to obtain their variables and parameters as accurate as possible. The method developed in this paper using a DC source for measuring the inductance in a DC machine overcomes some problems associated with traditional methods by using an alternating current source. In particular, it enables the field winding to carry its rated DC. This approach has demonstrated the feasibility of taking measurements for inductance in a DC machine and providing its field current that is sufficient to lead magnetic saturation, such that the flux can be kept the same as the supplied flux to the running DC machine. The proposed method for measuring both self-inductance and mutual inductance of the DC machine armature winding coils has played a main role in modeling DC machines under a wide range of operating conditions.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 94%

Developing measuring inductance strategies on a direct current machine using a DC source with magnetic saturation

Cui

Gale

2015

Circuit Theory & Apps

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“…The model can be used to develop the constant charging mode. In [16], current compensation strategies of inductive charging were studied and provided guidance to the current/voltage control. The focus of this paper is the coil alignment which is crucial to the power transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Radio Alignment for Inductive Charging of Electric Vehicles

Collings

Wang

et al. 2015

IEEE Trans. Ind. Inf.

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To maximize power transfer for inductively charging electric vehicles, charger and battery coils must be aligned. Wireless sensors can be installed to estimate misalignments; however, existing ranging techniques cannot satisfy the precision requirements of the misalignment estimation. We propose a high precision wireless ranging and misalignment estimation scheme, where high precision is achieved by iteratively measuring, estimating and aligning the coils. Another key aspect is to convert the non-convex misalignment estimation to a more tractable problem with a convex objective. We develop a conditional gradient descent method to solve the problem, which performs gradient descent (or conditional gradient descent on the boundary of the search space) and projects out-of-boundary points back into the space. Employing experimentally validated models, we show that our scheme can achieve 92% the efficiency of perfectly aligned coils in 90% operations, and tolerate correlated distance measurement errors. In contrast, the prior art is susceptible to the correlation, undergoing a significant efficiency degradation of 18.5%.

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“…As a fundamental electrical parameter, mutual inductance's practical usage appears in numerous fields and applications, such as all ranges of transformers [6], applications of wireless power transmission [1,2,3,7,8,14], generators, motors, magnetic resonance applications [5,9], medical electronic devices [10], etc. Many of the mentioned areas require precise computational results of mutual inductance.…”

Section: Introductionmentioning

confidence: 99%

Calculation of mutual inductance based on field-circuit coupling analysis for WPT

Han

Wang

2013

2013 5th International Conference on Power Electronics Systems and Applications(PESA)

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Determination of mutual inductance in the WPT system based on the electromagnetic coupling mode is crucial for system design and efficiency optimization. The analytic formulas and experimental methods which only aim at a coupling coil with a certain type of configuration and parameters are not universal approaches. Therefore they can't serve as a design basis for the system optimization. This paper presents a novel calculating method based on fieldcircuit coupling. This method can process the different coil configurations and two coils with different spatial positions. It also allows the variation of magnetic medium during modeling. In this method, the mutual inductance parameter is processed by Matlab with the secondary open circuit voltage as the intermediate variable. Then, a mutual inductance function of axial distance, intersection angle, coil configuration and turn ratio is obtained. This function can be directly used to calculate the operation parameters and optimize the system efficiency in the power transmission system with electromagnetic coupling or resonant coupling. The method has made a breakthrough and provided a powerful tool for the design and optimization of electromagnetic coupling power transmission system.

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Design of a contactless power charger for a functional jacket

Cited by 8 publications

References 16 publications

Developing measuring inductance strategies on a direct current machine using a DC source with magnetic saturation

Developing measuring inductance strategies on a direct current machine using a DC source with magnetic saturation

Radio Alignment for Inductive Charging of Electric Vehicles

Calculation of mutual inductance based on field-circuit coupling analysis for WPT

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