A Hybrid Digital Control System for Totem-Pole Isolated AC/DC Converters Used in Electric Vehicles

This article proposes a new digital control system for totem-pole isolated ac/dc converters operating in discontinuous conduction mode (DCCM). A hybrid combination of the new digital control system and existing control methods is implemented on an experiment prototype. The proposed hybrid control of...

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Bibliographic Details
Published in:IEEE transactions on transportation electrification 2024-06, Vol.10 (2), p.4359-4370
Main Authors: Askarian, Iman, Pahlevani, Majid, Knight, Andrew M.
Format: Article
Language:English
Subjects:
AC-DC converters
AC-DC power converters
Alternating current
Control methods
Control systems
Digital control
Digital control system
discontinuous conduction mode (DCM)
Electric vehicles
Frequency control
Frequency modulation
Hybrid control
Hybrid systems
isolated totem-pole converter
Steady-state
Switches
Synchronism
Transportation
Voltage control
Waveforms
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Summary:This article proposes a new digital control system for totem-pole isolated ac/dc converters operating in discontinuous conduction mode (DCCM). A hybrid combination of the new digital control system and existing control methods is implemented on an experiment prototype. The proposed hybrid control offers a flat efficiency curve over a 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 the current surge in the transformer current at turnover instants between positive and negative half-line cycles (HCSs). The proposed hybrid modulation uses a narrower range of switching frequency as compared to conventional methods. The proposed digital control system uses a unique semisquare-waveform pattern with a frequency synchronous with the line frequency (50 or 60 Hz). 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. Experiment results demonstrate the superior performance of the proposed hybrid control method.
ISSN:2332-7782
2577-4212
2332-7782
DOI:10.1109/TTE.2023.3317770