The use of various technologies to increase efficiency and safety has been continuously increasing. Wireless power transfer (WPT) has emerged as a key technology to increase in this regard. WPT can simplify complex wiring and improve safety by eliminating the need for mechanical contact. Most electronic devices used in buildings are of medium power, and research is being conducted to increase the output power of WPT through the combination of different technologies. This study proposes a 4-Tx WPT system using four transmitters (Tx) to satisfy the power requirements of medium-power electronic devices used in buildings. The existing WPT methods, 1-Tx and 2-Tx, were compared with the proposed 4-Tx WPT. The characteristics of efficiency and output power were analyzed through each Tx phase control of the 4-Tx system. The mutual inductance based on the distance between Tx and Rx was measured, and the relationship between the efficiency and output power was analyzed. Experimental results show that the proposed 4-Tx system is more advantageous in terms of medium power than the existing WPT methods. The proposed WPT system has power control capability, high output power, and high efficiency by adapting the phase control of each Tx. Moreover, it is confirmed that the range of the distance between Tx and Rx that is satisfying the minimum output power of medimum-power electronic device based on the relationship between the efficiency and the output power with the separation distance of Tx and Rx.

使用各种技术来提高效率和安全性一直在不断增加。无线电力传输 (WPT) 已成为在这方面增加的一项关键技术。WPT 可以通过消除对机械接触的需要来简化复杂的布线并提高安全性。建筑物中使用的大多数电子设备都是中等功率的，并且正在研究通过结合不同的技术来增加 WPT 的输出功率。本研究提出了一个使用四个发射器 (Tx) 的 4-Tx WPT 系统，以满足建筑物中使用的中等功率电子设备的功率要求。将现有的 WPT 方法 1-Tx 和 2-Tx 与建议的 4-Tx WPT 进行了比较。通过4-Tx系统的每个Tx相位控制分析效率和输出功率的特性。测量了基于Tx和Rx距离的互感，分析了效率和输出功率之间的关系。实验结果表明，所提出的 4-Tx 系统在中等功率方面比现有的 WPT 方法更有优势。所提出的 WPT 系统通过调整每个 Tx 的相位控制，具有功率控制能力、高输出功率和高效率。此外，根据Tx和Rx的分离距离与效率和输出功率之间的关系，确定了满足中等功率电子设备最小输出功率的Tx和Rx之间的距离范围。实验结果表明，所提出的 4-Tx 系统在中等功率方面比现有的 WPT 方法更有优势。所提出的 WPT 系统通过调整每个 Tx 的相位控制，具有功率控制能力、高输出功率和高效率。此外，根据Tx和Rx的分离距离与效率和输出功率之间的关系，确定了满足中等功率电子设备最小输出功率的Tx和Rx之间的距离范围。实验结果表明，所提出的 4-Tx 系统在中等功率方面比现有的 WPT 方法更有优势。所提出的 WPT 系统通过调整每个 Tx 的相位控制，具有功率控制能力、高输出功率和高效率。此外，根据Tx和Rx的分离距离与效率和输出功率之间的关系，确定了满足中等功率电子设备最小输出功率的Tx和Rx之间的距离范围。