Stikalni pretvorniki. Seminar: Načrtovanje elektronike za EMC Boštjan Glažar
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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 Krmiljenje 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 EC i SW i L L u L u L CEsat u 1 u PWM D C u R 2 B i D K u D K 1 - CEsat D in i L tranzistor prevaja dioda prevaja in I L D T (1 D) T L 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 krmilno L L K i D i B u S 1 vezje C 2 i C R B K I L i L I L tranzistor prevaja dioda prevaja t on t off T 1 1 D in i D I L I B in I L D T (1 D) T L 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) u L u EC i SW u D i D 1 CEsat i L u 1 PWM C u 2 R B u L L 2 K u D K D 1 D in CEsat i L tranzistor prevaja dioda prevaja in I L D T (1 D) T L L I L Δi L t on t off T u C 2 B. Glažar 7
8 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 8
9 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 9
10 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 10
11 Neizolirani pretvorniki II SEPIC Ćuk Avtorji slik: shemi: Cyril BTTAY, Mclausma (Wikipedia); grafa: Analog Devices AN-1106 B. Glažar 11
12 Primer izvedbe Dvojni pretvornik Vir: Application note Analog Devices AN-1106 B. Glažar 12
13 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 13
14 Izolirani p. I - Forward (magnetenje v eni smeri) N D 2 in N1 Vir slik: CoreMaster International B. Glažar 14
15 Izolirani p. II - Forward (magnetenje v obe smeri) N D 2 in N1 Vir slik: CoreMaster International B. Glažar 15
16 Izolirani p. III Ćuk pretvornik Avtorja slik: Cyril BTTAY, Glenn (Wikipedia) B. Glažar 16
17 Izolirani pretvorniki IV Flyback Avtorji slik: Cyril BTTAY, PSdesigner (Wikipedia) B. Glažar 17
18 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 18
19 Krmiljenje I Napetostno (voltage-mode) Signal napake žaga > PWM Tokovno (current-mode) Filtriranje špic RC filter Mrtvi čas Vir slik: nitrode -93, -128 app.note B. Glažar 19
20 Krmiljenje II Napajanje krmilnika Dodatni napajalnik por / dodatno navitje Povratna vezava Optično spojnik Transformator Meritev na primarni strani Vir slik: Texas Instruments TLV431 datasheet, -128 app.note B. Glažar 20
21 Krmiljenje III Meritev na primarni strani in kvazi-resonančno delovanje (flyback) Vir slik: CC28720 (SLSBE8B) B. Glažar 21
22 Krmiljenje IV Kvazi-resonančno delovanje(flyback) Vir slik: Design Considerations for the CC28600 (SLA399B) B. Glažar 22
23 Sklopljena tuljava stresana induktivnost Vir slik: CC28600 (SLS646K) B. Glažar 24
24 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
25 Vklopni tok (Inrush current) Omejevanje: por (izgube?) NTC (topli vklop?) upor + stikalo Vir slik: graf: Omron FAQ01874, shema: Pulspower B. Glažar 26
26 Primer izvedbe flyback ON Semiconductor C3844/45 B. Glažar 27
27 Primer izvedbe flyback B. Glažar 28
28 Literatura Power Semiconductor Applications Chapter 2: Switched Mode Power Supplies, Philips Semiconductors, nder the Hood of Flyback SMPS Designs SLP261, Texas Instruments, Design Considerations for the CC28600 SLA299B, Texas Instruments (Lisa Dinwoodie) Compensation Design With TL431 for CC28600 SLA671, Texas Instruments (Max Han, Zhong Ye) B. Glažar 29
29 Pozor, visoka napetost! Smrtno nevarno (Skoraj) vsi primarni deli omrežnega napajalnika, vključno z maso, so na smrtno nevarni napetosti! Brez dodatnih ukrepov ne smemo priključiti mase osciloskopa na primarno maso! Ob morebitnem testiranju napajalnika je priporočljiva uporaba ločilnega transformatorja. Kljub transformatorju je potrebna pazljivost, saj napajalna napetost ostaja enaka! Če ločilni transformator ni na voljo, je priporočljivo vsaj FID stikalo. Vhodni elektrolitski kondenzator lahko ostane napolnjen tudi več minut po izklopu napajalnika iz omrežja. B. Glažar 30
30 Konec Hvala za vašo pozornost B. Glažar 31
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