Pembangkit Variabel Frekuensi PWM Berbasis Mikrokontroller Dengan Metode Chua
Abstract
Dewasa ini banyak masyarakat yang memilih untuk menggunakan produk dengan teknologi LED. Hal itu disebabkan karena LED memiliki banyak kelebihan, akan tetapi LED driver yang mendrive LED juga menghasilkan elektromagnetic interference (EMI) yang besar akibat dari frekuensi switching. Maka dari itu, untuk meminimalisir EMI pada LED driver dapat dilakukan dengan menggunakan metode spread spectrum dan chaos yang dibuat dalam bentuk program dan diimplementasikan ke dalam Chipkit Uno32. Metode chaos yang dipilih yaitu Chua. Kedua metode inilah yang menyebarkan dan mengacak frekuensi yang dihasilkan sehingga emisi EMI pada LED driver dapat berkurang. Pada proyek akhir ini, frekuensi center yang digunakan yaitu 525 KHz tetapi kemampuan Chipkit Uno32 hanya bisa membangkitkan frekuensi 526 KHz. Range frekuensi yang digunakan yaitu ± 4 % dari 526 KHz. Hasil yang didapat yaitu sinyal tunggal memiliki level daya sebesar 9,95 dBm. Hasil yang terbagus didapat pada saat 100.000 data dengan kecepatan pergeseran frekuensi sebesar 0,1 µs yaitu -23,57 dBm.References
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