Abstract
The coil design of the inductive power transfer (IPT) for a transmitter (Tx) and receiver (Rx) is crucial to determine the performance of the IPT. Considering core loss and copper loss of the Tx and Rx coils, which are major loss terms of the whole IPT system, determination of the winding turns for the Tx and Rx coils becomes a key factor for maximum power transfer design of the IPT coils. In this paper, an optimal turns design of IPT coils for laptop wireless charging applications with a maximum power transfer efficiency is proposed. Under a specific design requirement of IPT, optimal turns of the Tx and Rx coils N1,op and N2,op can be determined by the proposed IPT coil design procedure with a finite-element-method (FEM) based simulation analysis. From the results of the coil design by the proposed IPT coil design methodology, N1,op and N2,op for maximum power efficiency, and input DC voltage V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> for the target load power can be found by the proposed coil design procedure. The 40W prototypes of the two symmetry and asymmetry IPT coils for laptop wireless charging were fabricated, and verified by simulation and experiments. To separately verify the core and copper loss of the IPT coils, a resistance model and Steinmetz equation-based methods were comparatively evaluated, and it was found that they matched well at a core temperature condition of below 40oC. The results showed that the total weight and the thickness of the Tx and Rx coils as well as the maximum power efficiencies of 95.1% and 96.8% for the symmetry and asymmetry cases were obtained by the proposed IPT coil design procedure, which becomes a practical solution for the laptop wireless charging coil design.
Highlights
Convenient power transfer methods have been required since the advent of electricity in the 19th century [1]–[33]
The proposed inductive power transfer (IPT) design methodology to determine the optimal number of turns having the maximum power transfer efficiency is found to be a useful and practical solution for laptop wireless charging applications in this paper
When the load characteristics and physical size of Tx and Rx cores, which are inherently given for the laptop wireless charging applications, are specified for the IPT design, the optimum values of N1 and N2 can be determined for operating at the maximum power efficiency
Summary
Convenient power transfer methods have been required since the advent of electricity in the 19th century [1]–[33]. The installation space for Tx and Rx coils is restricted In this light, an optimal coil design is highly recommended under a given physical dimension of the IPT application for operating at the maximum power transfer efficiency. Coreless coil structures may be preferred to remove core loss for efficient operation [25]–[27] In such previous works, the number of turns for Tx and Rx coils is arbitrarily determined without a reasonable design standard. Only the coupling coefficient is considered and the power efficiency is not validated in this research [33] Most importantly, such proposed coil design methodologies are based on the coreless type Tx and Rx coils [31]–[33]. The proposed coil design methodology can be generally adopted to determine the number of turns for operating at maximum power transfer efficiency. The validity of the proposed IPT is verified by simulations and experiments, showing the universality of the proposed IPT design procedure and providing a practical solution to design an IPT system
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