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A hybrid digital control system for totem-pole isolated AC/DC converters used in electric vehicles

Askarian, I ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1109/TTE.2023.3317770
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2023
  4. Abstract:
  5. This paper proposes a new digital control system for totem-pole isolated AC/DC converters operating in discontinuous conduction mode. A hybrid combination of the new digital control system and existing control methods is implemented on an experimental prototype. The proposed hybrid control offers a flat efficiency curve over wide range of operations. Moreover, a new synchronization timing method and a new variable frequency modulation (FM) are incorporated inside the proposed method to mitigate current surge in the transformer current at turn over instants between positive and negative half line cycles. The proposed hybrid modulation uses a narrower range of switching frequency as compared to conventional methods. The proposed digital control system uses a unique semi-square-waveform pattern with a frequency synchronous with the line frequency (50Hz or 60Hz). Due to this, each of the two output diodes in the center-tapped full-wave rectifier operates only in one half of the line cycle. Zero current turn-on for the output diodes and reduced reverse-recovery losses are achieved. Experimental results demonstrate the superior performance of the proposed hybrid control method. IEEE
  6. Keywords:
  7. AC-DC power converters ; Digital control ; Digital control system ; Discontinuous conduction mode ; Frequency control ; Isolated totem-pole converter ; Steady-state ; Switches ; Transportation ; Voltage control
  8. Source: IEEE Transactions on Transportation Electrification ; 2023 , Pages 1-1 ; 23327782 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/10302178