Biomedical implants (BMIs) and biomedical sensors (BMSs) help to improve quality of life, detect diseases, provide monitoring of vital signs, and take over the role of malfunctioning organs. These implants and sensors require continuous battery power to work effectively, but the batteries used are restricted by their limited capacity and lifetime. This research reported here involved the design and implementation of a wireless charging system based on a series–parallel spider-web coil (WPT-SP-SWC), specifically for cardiac pacemakers. The experimental design investigated several important parameters, including air gap, applied source voltage, coil size, and operating frequency. Performance metrics were evaluated in terms of output DC voltage, delivered output power, and power transfer efficiency. The target voltage was 5 V, which is adequate to charge a BMI such as a pacemaker, and three source voltages (5, 15, and 25 V) were tested. The design was examined at six operating frequencies, ranging from 1.78 MHz to 6.78 MHz. The most favorable results were achieved at 1.78 MHz. Power transfer efficiencies at a 10 mm air gap were 95.75% and 92.08% for applied voltages of 5 V and 15 V, respectively. The effectiveness of the proposed system was also validated by comparing the findings with previous articles.

中文翻译：

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基于D类功率放大器和串并联蛛网线圈的心脏起搏器无线充电

生物医学植入物 (BMI) 和生物医学传感器 (BMS) 有助于提高生活质量、检测疾病、提供生命体征监测以及接管功能障碍器官的作用。这些植入物和传感器需要持续的电池供电才能有效工作，但所使用的电池受到容量和寿命的限制。此处报告的这项研究涉及基于串并联蜘蛛网线圈 (WPT-SP-SWC) 的无线充电系统的设计和实施，专门用于心脏起搏器。实验设计研究了几个重要参数，包括气隙、施加的源电压、线圈尺寸和工作频率。性能指标根据输出直流电压、提供的输出功率和功率传输效率进行评估。目标电压为 5 V，这足以为起搏器等 BMI 充电，并测试了三个电源电压（5、15 和 25 V）。该设计在六个工作频率下进行了检查，范围从 1.78 MHz 到 6.78 MHz。最有利的结果是在 1.78 MHz 时获得的。对于 5 V 和 15 V 的施加电压，10 mm 气隙处的功率传输效率分别为 95.75% 和 92.08%。通过将研究结果与以前的文章进行比较，还验证了所提出系统的有效性。