Stikalni pretvorniki. Seminar: Načrtovanje elektronike za EMC Boštjan Glažar
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- Λαυρέντιος Κουρμούλης
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1 Stikalni pretvorniki Seminar: Načrtovanje elektronike za EMC Boštjan Glažar niverza v Ljubljani Fakulteta za elektrotehniko Tržaška cesta 25, SI-1000 Ljubljana
2 Vsebina Prednosti stikalnih pretvornikov Neizolirani pretvorniki Izolirani pretvorniki Parazitne lastnosti transformatorja / sklopljene induktivnosti Pomožna vezja PFC B. Glažar 2
3 Zakaj stikalni pretvornik Izkoristek > in in Velikost Vir slik: sheme: Wikipedia; foto: B. Glažar 3
4 Neizolirani pretvorniki I Navzdol (step-down, buck) Navzgor (step-up, boost) Navzdol/Navzgor (buck-boost) Osnovne enačbe za neprekinjeno delovanje: D in 1 1 D in D 1 D in Avtorja slik: TyIzaeL, Mak17f (Wikipedia) B. Glažar 4
5 Pretvornik navzdol (step-down, buck) u L CEsat i L K u 1 PWM L C u 2 R u D K 1 - CEsat D in i L tranzistor prevaja dioda prevaja I L D T in L I L Δi L t on t off T u C B. Glažar 5
6 Pretvornik navzgor (step-up, boost) u s 2 + K CEsat u L 1 - CEsat i L L L i D K i B K krmilno u S 1 vezje C 2 i C R B I L i L I L t on t off T 1 1 D in i D I L I B I L D T L in i C Q C Q C u C Cpp B. Glažar 6
7 Pretvornik navzdol/navzgor invertirajoči (buck/boost, inverting, non-isolated flyback) On Off D 1 D in I L D T L in Vir slik: Power Semiconductor Applications; Philips Semiconductors; Cyril BTTAY (Wikipedia) B. Glažar 7
8 Krmiljenje Napetostno (voltage-mode) Signal napake žaga > PWM Filtriranje špic Tokovno (current-mode) Vir slik: nitrode -93, -128 app.note B. Glažar 8
9 Primer izvedbe pretvornik navzdol ST L4976 Vhod: 8 55 V Izhod: do 1 A Frekvenca do 300 khz DIP8, SO16 Izkoristek: 85 24/3,3 V B. Glažar 9
10 Primer izvedbe pretvornik navzgor Texas Instruments (nitrode) C2577 Topologije: navzgor, flyback, forward Vhod: do 40 V Stikalo: 3 A, 65 V To Izkoristek: 80 5 / 12 V, 800 ma B. Glažar 10
11 Primer izvedbe pretvornik navzgor s konstantnim izhodnim tokom Texas Instruments TPS92690 Topologije: navzgor, flyback, SEPIC, Ćuk Vhod: 4,5 75 V Oscilator: do 2 MHz PWM zatemnjevanje B. Glažar
12 Primer izvedbe pretvornik navzgor s konstantnim izhodnim tokom Texas Instruments TPS92690 SMD 5x5 mm Notranja referenčna napetost Mehki zagon Oscilator Temperaturna omejitev Ojačevalnik napake Zaščita v primeru odprtega bremena (OVP) B. Glažar
13 Pretvornik navzgor potek načrtovanja Specifikacije: in,, P, f ΔI L -> L, D, Q1, C in (p-p) -> C,, in(p-p) -> C in Povratna vezava: I, MAX TPS92690 B. Glažar
14 Pretvornik navzgor potek načrtovanja Mehki zagon Onemogočenje pri nizki vhodni napetosti (VLO) Zatemnjevanje Zvezno (analog) PWM B. Glažar
15 Neizolirani pretvorniki II SEPIC (Single-ended primary-inductor converter) Ćuk Zeta Neprekinjeno delovanje: D 1 D D 1 D in in Avtorji slik: Cyril BTTAY, Mclausma, Wdwd (Wikipedia) B. Glažar 15
16 Neizolirani pretvorniki II SEPIC Ćuk Avtorji slik: shemi: Cyril BTTAY, Mclausma (Wikipedia); grafa: Analog Devices AN-1106 B. Glažar 16
17 Primer izvedbe Dvojni pretvornik Vir: Application note Analog Devices AN-1106 B. Glažar 17
18 Izboljšave Sinhroni pretvornik Tranzistor namesto diode Večfazni pretvornik Velik izhodni tok Hitrejši odziv Manjša valovitost toka Vir slik: Eric Persson, How FET selection can optimize synchronous buck converter efficiency, EEtimes; B. Glažar 18
19 Izolirani pretvorniki I Flyback Avtorji slik: Cyril BTTAY, PSdesigner (Wikipedia) B. Glažar 19
20 Flyback Prekinjeno delovanje I primp L in t prim on Neprekinjeno delovanje P DCM I 2 primp L 2 prim f N D 2 in N1 1 D D RL T 2 L prim in B. Glažar 20
21 Izolirani p. II - Forward (magnetenje v eni smeri) N D 2 in N1 Vir slik: CoreMaster International B. Glažar 21
22 Izolirani p. II - Forward (magnetenje v obe smeri) N D 2 in N1 Vir slik: CoreMaster International B. Glažar 22
23 Izolirani p. III Ćuk pretvornik Avtorja slik: Cyril BTTAY, Glenn (Wikipedia) B. Glažar 23
24 Sklopljena tuljava stresana induktivnost Vir slik: shema in graf: nder the Hood of Flyback SMPS Designs, Texas Instruments B. Glažar 24
25 Sklopljena tuljava medovojna kapacitivnost Vir slik: nder the Hood of Flyback SMPS Designs, Texas Instruments; Justin Clack, Minimizing EMI Problems in Noisy Switching Converter Circuits...and Bears, EEWiki; Murata B. Glažar 25
26 Konec Hvala za vašo pozornost 37
Stikalni pretvorniki. Seminar: Načrtovanje elektronike za EMC Boštjan Glažar
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