kuliah 3 ac to dc conversion rectifier (terkontrol dan ... · pdf file(terkontrol dan tidak...
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Kuliah 3 AC to DC Conversion Rectifier (terkontrol dan tidak terkontrol)
Materi: 3.1 Rangkaian Penyearah (rectifier)
Topologi: o Half-wave, o full-wave,
Catu daya: (power input): o satu fasa o tiga fasa
3.2 Rectifier performance 3.3 “Commutation” effect. 3.4 Line current issues
Line current distortion Neutral current
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3.1 Ideal Rectifiers:
3.1.1 Definisi:
Mengubah tegangan AC dari sumber (PLN) menjadi daya dc menggunakan dioda daya atau dengan mengatur sudut penyalaan (firing angle) dari SCR atau controllable switch.
Blok diagram:
Gambar 3.1 Blok diagram rectifier
Aplikasi:
DC welder,
DC motor drive,
Battery charger,
DC power supply,
HVDC (high voltage dc)
3.1.2 Satu fasa dengan beban R A. Half wave (½ gelombang)
A.1 Tidak terkontrol (Fixed dc output)
(a) Rangkaian (b) gelombang
Gambar 3.2 Penyearah dioda setengah gelombang dengan beban R
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Tegangan keluarannya:
dc tidak dapat dikontrol (besarnya tetap) ada ripple (riak) pada gelombang keluarannya:
o Vo(rms) muncul o praktis ripple yang dijinkan untuk tegangan:10%,
arus: 5%. o perbaikan ripple dengan filter kapasitor
Berdasarkan Gambar 3.2b
Persamaan tegangan dc keluarannya
Persamaan tegangan rms keluarannya:
A.2 Terkontrol (regulated dc output)
(a) Rangkaian (b) Gelombang
Gambar 3.3 Penyearah SCR ½ gelombang dengan beban R
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Tegangan keluarannya: dc dapat dikontrol/regulated (besarnya dapat diubah) ada ripple (riak) pada gelombang keluarannya:
o Vo(rms) muncul o praktis ripple yang dijinkan untuk tegangan:10%,
arus: 5%. o perbaikan ripple dengan filter kapasitor
Berdasarkan Gambar 3.3b
Persamaan tegangan dc (rata-rata) keluarannya:
Persamaan tegangan rms keluarannya:
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B. Half wave dengan Beban R-L B.1 Tidak terkontrol
Gambar 3.4 Penyearah dioda ½ gelombang dengan beban RL Berdasarkan Gambar 3.4, diperoleh:
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