1 / 27

A ZVS approach for AC/DC converter with PFC

Power e Lab HKU. Power e Lab HKU. A ZVS approach for AC/DC converter with PFC. The Power Electronics Lab., Hong Kong University N. K. Poon C. P. Liu M. H. Pong Speaker Bryan M. H. Pong. Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 1. Load. Power e Lab HKU.

thanos
Télécharger la présentation

A ZVS approach for AC/DC converter with PFC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. PowereLabHKU Power eLab HKU A ZVS approach for AC/DC converter with PFC The Power Electronics Lab., Hong Kong University N. K. Poon C. P. Liu M. H. Pong Speaker Bryan M. H. Pong Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 1

  2. Load Power eLab HKU Some basic concepts • Input rectifiers and capacitor produce Pulsating input current • Harmonic currents are generated Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 2

  3. Ipfc Idc Power eLab HKU A conventional method • A boost converter and a DC/DC converter Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 3

  4. Ipfc Idc Power eLab HKU A popular method among researchers • Single stage design which combines the boost and the DCDC converters Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 4

  5. Power eLab HKU Is single stage design always better? Let us take a look Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 5

  6. Ipfc Idc Power eLab HKU Why two-stage design? • Advantage • Losses Ipfc2 + Idc2 • Fix DCDC input voltage • Controllable bulk voltage • Disadvantage • Need two controllers • One more MOSFET Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 6

  7. Ipfc Idc Power eLab HKU Why single-stage design? • Advantage • One controller • One MOSFET less • Disadvantage • Losses  (Ipfc + Idc)2 • High Idcat low line • Higher Ipfc • High current stress • High voltage stress Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 7

  8. Power eLab HKU Good reasons for two-stage • Two-Stage • Advantages • Losses Ipfc2 + Idc2 • Fix DCDC input voltage • Controllable bulk voltage • Disadvantages • Need two controller • One more MOSFET • Single Stage • Advantages • One controller • One MOSFET less • Disadvantages • Losses  (Ipfc + Idc)2 • High Idcat low line • Higher Ipfc • High current stress • High voltage stress Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 8

  9. Power eLab HKU Our new idea Boost + Asymmetric half-bridge with soft switching DMpfc > DM2 M1 Mpfc M2 Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 9

  10. Power eLab HKU Zero voltage state - M2 M1turn off then . . Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 10

  11. Power eLab HKU Zero voltage state - Mpfc After M2turn on Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 11

  12. Power eLab HKU Two separate converters M2turn on Mpfcturn on Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 12

  13. Power eLab HKU Zero voltage state – M1 M2turn off Mpfcturn on Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 13

  14. Power eLab HKU One cycle on asymmetric M1turn on Mpfcturn on Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 14

  15. Power eLab HKU One cycle on PFC M1turn on Mpfcturn off Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 15

  16. Power eLab HKU It’s great, but . . . If DMpfc < DM2 DMpfc =DM2 No control for PFC !! Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 16

  17. Power eLab HKU After all – small Maux added For all DMpfcand all DM2 M1 Maux Mpfc M2 Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 17

  18. Power eLab HKU Final timing arrangement ZVS too M2 gate drive A M1 gate drive B Maux gate drive Mpfc gate drive VA = VB VMaux_ds = VA-VB =0 Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 18

  19. Power eLab HKU Practical consideration M1 Maux Mpfc Doff M2 guarantee a path for Laux current when M2 off at any time Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 19

  20. Power eLab HKU Practical circuit – O/P 12V@10A 250uH IRF840A Two diodes are used to clamp ringing STD5NM50 12uH 8uH STPS12NM50 STPS12NM50 Active Diode Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 20

  21. Power eLab HKU Simplified timing circuit L5991 M2 gate O/P Sync M1 gate Maux gate Sync L4981 Mpfc gate O/P Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 21

  22. Power eLab HKU How does it look? A 120W, 12V10A AC adapter Width = 12.6cm Depth = 6.3cm Height = 1.9cm Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 22

  23. Power eLab HKU ZVS on M2 Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 23

  24. Power eLab HKU ZVS on Mpfc Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 24

  25. Power eLab HKU ZVS on Mpfc & M2 Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 25

  26. Power eLab HKU Losses and Efficiency < 1W at no load 91% efficiency 12V@10A Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 26

  27. Power eLab HKU Finally . . . • Simple Boost + Asymmetric Half-bridge configuration – Good Combination. • All ZVS behaviors – Very little added cost. • Two separate converter – Easy to control • Active diode can be incorporated – <1W no load power • Simple PWM controller – simple ASIC Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 27

More Related