4.8 Article

Highly Efficient Full-Bridge Resonant AC/DC Converter Using T-Type Voltage Doubler

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 11, Pages 11076-11087

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3123698

Keywords

Almost zero-voltage switching (ZVS) turn-OFF; high efficiency; series-resonant circuit; T-type voltage doubler

Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1C1C1004276]
  2. Ministry of SMEs and Startups (MSS, Korea) [S2968635]
  3. Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2968635] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  4. National Research Foundation of Korea [2021R1C1C1004276] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This article presents a full-bridge resonant AC/DC converter that minimizes switching loss over the entire grid voltage cycle. By utilizing the voltage fluctuation at a T-type voltage doubler, the converter achieves zero-voltage switching at high output power and improved efficiency.
This article presents full-bridge resonant ac/dc converter that minimizes switching loss over entire grid voltage cycle. By using the voltage fluctuation at T-type voltage doubler, the existing hard-switched components are turned-off with almost zero-voltage switching at high instantaneous output power and with less than half of the output voltage at low instantaneous output power. Moreover, no instantaneous reactive current flows through the circuit under wide variations of grid voltages and loads. Furthermore, the proposed converter has balanced loss distribution over the primary-side and secondary-side switches, which ensures high power transfer capability with improved overall switch utilization. A 1-kW prototype is developed and tested to demonstrate the circuit functionality. Finally, the efficiency improvement is investigated; comparisons show the benefit of the proposed converter over conventional converters that use unfolders.

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