TRÖÔØNG ÑAÏI HOÏC KYÕ THUAÄT COÂNG NGHEÄ
KHOA ÑIEÄN - ÑIEÄN TÖÛ Ngaøy ……… thaùng ……… Naêm …………
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?
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2. Ñieåm gioáng nhau vaø khaùc nhau veà hoaït ñoäng giöõa Thyristor vaø Triac?
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3. Ñoái vôùi maïch ñieàu khieån Thyristor vaø Triac thöôøng coù nhöõng yeâu caàu gì?
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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 ?
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5. Kích loàng xung cho thyristor ñeå giaûi quyeát vaán ñeà gì?
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6. Nhieäm vuï cuûa bieán aùp loái vaøo TF5.
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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 IDVDGhi 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 : ................................................................................................
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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
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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
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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.
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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.
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