Đề cương thí nghiệm mạch kích Thyristor và Triac

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Nội dung Text: Đề cương thí nghiệm mạch kích Thyristor và Triac

TRÖÔØNG ÑAÏI HOÏC KYÕ THUAÄT COÂNG NGHEÄ Ngaøy ……… thaùng ……… Naêm ………… KHOA ÑIEÄN - ÑIEÄN TÖÛ BAØI 1 : THÍ NGHIEÄM MAÏCH KÍCH THYRISTOR VAØ TRIAC A. CAÂU HOÛI CHUAÅN BÒ TRÖÔÙC KHI THÍ NGHIEÄM 1. Nhöõng ñieàu kieän ñeå Diode, Thyristor vaø Triac daãn. Phöông phaùp ñoùng Thyristor thöôøng duøng trong ñieàu khieån? .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... 2. Ñieåm gioáng nhau vaø khaùc nhau veà hoaït ñoäng giöõa Thyristor vaø Triac? .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... 3. Ñoái vôùi maïch ñieàu khieån Thyristor vaø Triac thöôøng coù nhöõng yeâu caàu gì? .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... 4. Soùng ñoàng boä coù yù nghóa nhö theá naøo ñoái vôùi vieäc kích ñoùng Thyristor? Coù theå choïn nhöõng daïng soùng ñoàng boä naøo ? .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... 5. Kích loàng xung cho thyristor ñeå giaûi quyeát vaán ñeà gì? .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... 6. Nhieäm vuï cuûa bieán aùp loái vaøo TF5. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... Trang 1
B. KEÁT QUAÛ THÍ NGHIEÄM MAÏCH KÍCH THYRISTOR VAØ TRIAC ÑIEÀU KHIEÅN ÑOÀNG BOÄ I. KHAÛO SAÙT HOAÏT ÑOÄNG CUÛA DIODE COÂNG SUAÁT: 1. Khaûo saùt vôùi nguoàn ñieän DC: Traïng thaùi ID VD Ghi Chuù Phaân cöïc ngöôïc Phaân cöïc thuaän 2. Khaûo saùt vôùi nguoàn ñieän AC: a. Tröôøng hôïp taûi trôû R CH1-X ....................... V/Div Time Base.................ms/Div b. Tröôøng hôïp taûi caûm L CH1-X ....................... V/Div Time Base.................ms/Div Nhaän xeùt : ................................................................................................ ................................................................................................................. ................................................................................................................. ................................................................................................................. Trang 2
II. ÑIEÀU KHIEÅN SCR: Nguoàn ñieän aùp xoay chieàu: U = [V], taàn soá f = [Hz] Nguoàn ñieän aùp moät chieàu : U = [V] Dao ñoäng kyù: Taàn soá: Chænh α = π/2 1. Daïng soùng tín hieäu sin ñieàu khieån ñoàng boä cung caáp CH1-X ....................... V/Div Time Base.................ms/Div Tín hieäu taïi TP1 CH1-X .................... V/Div Time Base....................ms/Div Trang 3
Tín hieäu taïi TP2 CH1-X ..................... V/Div Time Base....................ms/Div Tín hieäu taïi TP3 CH1-X ..................... V/Div Time Base....................ms/Div Tín hieäu taïi TP4 CH1-X ..................... V/Div Time Base....................ms/Div Trang 4
Tín hieäu taïi TP5 CH1-X ..................... V/Div Time Base....................ms/Div Tín hieäu treân taûi R CH1-X................... V/Div Time Base....................ms/Div 2. Giaûi thích söï khaùc nhau tín hieäu treân taûi khi thay ñoåi loái ra OUT3 (PEC-502) cho OUT1. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. 3. Giaûi thích söï khaùc nhau tín hieäu ra treân taûi khi khi ñaûo ngöôïc daây caáp nguoàn ∼24V cho loái vaøo sô ñoà ñieàu khieån ñoàng boä PEC-502. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. Trang 5
4. Tín hieäu treân taûi L CH1-X ..................... V/Div Time Base....................ms/Div 5. Vaën bieán trôû P3 treân PEC-502/1 ñeå thay ñoåi goùc ñieàu khieån. α=π/5, veõ laïi daïng soùng treân taûi trôû vaø taûi caûm. a. Tín hieäu treân taûi R CH1-X ..................... V/Div Time Base....................ms/Div Trang 6
b. Tín hieäu treân taûi L CH1-X ..................... V/Div Time Base....................ms/Div III. ÑIEÀU KHIEÅN ÑOÀNG BOÄ TRIAC: Nguoàn ñieän aùp xoay chieàu: U = [V], taàn soá f = [Hz] Nguoàn ñieän aùp moät chieàu : U = [V] Dao ñoäng kyù: Taàn soá: Chænh α = π/2 1. Tín hieäu treân taûi R CH1-X ..................... V/Div Time Base....................ms/Div Trang 7
2.Tín hieäu treân taûi L CH1-X ..................... V/Div Time Base....................ms/Div 3. Giaûi thích söï khaùc nhau tín hieäu ra treân taûi khi thay loái ra OUT3 (PEC-502) cho OUT1. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. 4. Giaûi thích söï khaùc nhau tín hieäu ra treân taûi khi ñaûo ngöôïc daây caáp nguoàn ∼24V cho loái vaøo sô ñoà ñieàu khieån ñoàng boä PEC-502. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. 5. Vaën bieán trôû P3 treân PEC-502/1 ñeå thay ñoåi goùc ñieàu khiển α =π/5, veõ laïi daïng soùng treân taûi trôû vaø taûi caûm. a. Tín hieäu treân taûi R CH1-X ..................... V/Div Time Base....................ms/Div Trang 8
b. Tín hieäu treân taûi L CH1-X ..................... V/Div Time Base....................ms/Div 6. Giaûi thích söï khaùc nhau veà daïng soùng giöõa tröôøng hôïp taûi trôû vaø taûi caûm cho maïch kích SCR vaø Triac. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. .............................................................................................................................. Trang 9