Lampu LED terkenal kerana mempunyai pelbagai ciri-ciri seperti penjimatan tenaga, jangka hayat yang panjang, percahayaan yang efisien dan kos penyelenggaraan yang rendah. Lampu LED sesuai untuk kegunaan di pelbagai lokasi dan bidang, seperti di dalam atau di luar bangunan dan juga dalam kenderaan elektrik. Penilaian prestasi cahaya LED bergantung kepada nilai yang diambil dari pengukuran faktor kuasa, kecekapan dan jumlah herotan harmonik pemacu LED. Untuk mencapai nilai yang bagus, penukar satu peringkat dua keluaran AU-AT dengan PFC dan hibrid jambatan-penuh penerus adalah dicadangkan dalam tesis ini. Ia boleh digunakan sebagai dua jenis pemacu LED. Apabila keadaan suis geganti (SWR) ditukar daripada suis tutup (terbuka) kepada suis buka(ditutup), peringkat kedua dalam topologi yang dicadangkan ditukar daripada penerus jambatan-penuh (jenis 1) kepada jambatan-penuh voltan berganda penerus (jenis 2). Penukar yang dicadangkan terdiri daripada satu tangki LLC dan dua litar rangsangan dengan satu induktor yang dikongsi. Penukar yang dicadangkan direka untuk menerima bekalan masukan satu-fasa 240 VAC, 50Hz. Pada frekuensi salunan tinggi iaitu 100 kHz dan kitar tugas pada 48.5% telah digunakan untuk suis. Untuk simulasikan penukar yang dicadangkan, perisian MATLAB Simulink telah digunakan. Apabila kuasa keluaran pada 100 W dan relay suis terbuka, faktor kuasa, kecekapan, jumlah herotan harmonik, dan voltan bas didapati bernilai 0.99, 93.3%, 14.53%, dan 338 V, masing-masing. Apabila kuasa keluaran adalah 100 W dan relay suis telah ditutup, faktor kuasa, kecekapan, jumlah herotan harmonik, dan voltan bas didapati bernilai 0.989, 91.8%, 15.17%, dan 340 V, masing-masing. Di samping itu, ciri-ciri lembut pensuisan telah dicapai. Suis MOSFET dihidupkan semasa pensuisan sifar voltan (ZVS) dan diod keluaran peringkat secondari dihidupkan semasa pensuisan sifar arus (ZCS). Tambahan lagi, apabila suis geganti telah ditutup, voltan yang keluar adalah dua kali ganda lebih tinggi daripada voltan apabila relay suis terbuka. Ini bermakna aliran arus elektrik yang melalui diod, kapasitor, dan transformer adalah lebih kecil yang menyebabkan pengurangan tekanan pada komponen dan berpotensi untuk meningkatkan kadar jangka hayat operasi mereka.
LED lights have become the most well-known type of lights, owing to their multiple features such as energy saving, long life-span, good luminous efficacy and low maintenance costs. LED lights are suitable for usage in various locations and fields, such as indoor or outdoor locations, and in electric vehicles. The evaluation of the performance of LED light depends on the values taken from measurement of the power factor, efficiency and total harmonic distortion of the LED driver. To achieve good values, a single-stage dual output AC/DC converter with PFC is proposed in this thesis. It can be used as two distinct types of the LED driver. When the relay switch (SWr) state is changed from turned-off (open) to turned-on (closed), the secondary-side of the proposed topology is changed from a full-bridge rectifier (type 1) to a full-bridge voltage doubler rectifier (type 2). The proposed converter consists of one LLC tank and two boost circuits with one shared inductor. The proposed converter is designed to work with 240 VAC, 50Hz single-phase input supply voltage. A high resonant frequency at 100 kHZ and a duty cycle at 48.5% were used for the switches. To simulate the proposed converter, MATLAB Simulink software was utilized. When the output power was at 100 W and the relay switch was open, the power factor, efficiency, total harmonic distortion, and bus voltage were found to be 0.99, 93.3%, 14.53%, and 338 V, respectively. When the output power was at 100 W and the relay switch was closed, the power factor, efficiency, total harmonic distortion, and bus voltage were found to be 0.989, 91.8%, 15.17%, and 340 V, respectively. In addition to that, the soft-switching characteristics were also achieved. The MOSFET switches are turned on during zero voltage switching (ZVS) and the secondary output diodes are turned off during zero current switching (ZCS). Furthermore, when the relay switch was closed, the output voltage was twice higher than that when the relay switch was open. This means that smaller current are flowing through the output diodes, output capacitor and transformer, which leads to reducing the stress on these components and potentially increasing their operating lifespan.
A single-stage dual output acdc converter with pfc for supplying led light_ Ashraf Mohammad Bani Ahmad_E3_2017_MFAR