Habibah, Zulfa (2025) PERANCANGAN SISTEM WIRELESS POWER TRANSFER UNTUK PENGISIAN DAYA SMARTWATCH. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The development of wearable devices such as smartwatches demands a practical and efficient power charging method. However, the use of physical connectors in the charging process still has limitations, such as connector wear and dependence on specific positioning. Therefore, an alternative solution is needed in the form of a Wireless Power Transfer system that can transfer energy without direct contact, especially for low-power devices. In this study, a Wireless Power Transfer system was designed and developed based on the inductive coupling method, using key components such as an Arduino Uno microcontroller, 6N137 optocoupler, IR2118 driver, and four IRF3205 MOSFETs. The system operates by generating high-frequency switching signals from the microcontroller, which are then amplified by the driver and delivered to the transmitter coil. The receiver coil captures the magnetic field from the transmitter and induces a voltage that is subsequently rectified to supply power. Testing was conducted on various coil configurations to observe the effect of the number of turns and wire type on the output voltage. The test results showed that the system successfully transferred power wirelessly. The coil configuration with 10 turns of stranded copper wire produced the highest DC output voltage of 5.05 V, which is closest to the system’s target. Although the actual operating frequency only reached approximately 36.19 kHz, the system functioned stably. This study demonstrates that a Wireless Power Transfer system with a simple approach can be implemented and work effectively for smartwatch charging applications, although further optimization is needed to improve efficiency and stability under various usage conditions. Keywords : Wireless Power Transfer, Inductive Coupling, Smartwatch, Arduino Uno, MOSFET IRF3205, IR2118, Wireless Charging. Perkembangan perangkat wearable seperti smartwatch menuntut ketersediaan metode pengisian daya yang praktis dan efisien. Namun, penggunaan konektor fisik dalam proses pengisian masih memiliki keterbatasan, seperti keausan konektor dan ketergantungan pada posisi tertentu. Oleh karena itu, dibutuhkan solusi alternatif berupa sistem Wireless Power Transfer yang mampu mentransfer energi tanpa kontak langsung, terutama untuk perangkat dengan daya rendah. Dalam penelitian ini, dirancang dan dibangun sistem Wireless Power Transfer berbasis metode inductive coupling dengan komponen utama berupa mikrokontroler Arduino Uno, optocoupler 6N137, driver IR2118, dan empat buah MOSFET IRF3205. Sistem ini bekerja dengan prinsip pengaliran sinyal switching berfrekuensi tinggi yang dihasilkan oleh mikrokontroler, kemudian diperkuat oleh driver dan disalurkan ke kumparan transmitter. Kumparan receiver menangkap medan magnet dari transmitter dan menghasilkan tegangan induksi yang kemudian disearahkan untuk mengisi daya. Pengujian dilakukan pada beberapa konfigurasi kumparan untuk mengetahui pengaruh jumlah lilitan dan jenis kawat terhadap tegangan keluaran. Hasil pengujian menunjukkan bahwa sistem telah berhasil melakukan transfer daya secara nirkabel. Konfigurasi kumparan dengan 10 lilitan kawat tembaga serabut menghasilkan tegangan DC tertinggi sebesar 5,05 V, yang paling mendekati target sistem. Meskipun frekuensi kerja aktual hanya mencapai sekitar 36,19 kHz, sistem mampu berfungsi dengan stabil. Penelitian ini membuktikan bahwa sistem Wireless Power Transfer dengan pendekatan sederhana dapat direalisasikan dan bekerja secara efektif untuk aplikasi pengisian daya smartwatch, meskipun optimalisasi lanjutan diperlukan untuk peningkatan efisiensi dan kestabilan pada berbagai kondisi penggunaan. Kata Kunci : Wireless Power Transfer, Inductive Coupling, Smartwatch, Arduino Uno, MOSFET IRF3205, IR2118, Pengisian Daya Nirkabel.
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