Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 1, Pages 607-616Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3001161
Keywords
Voltage control; Topology; Resonant converters; Integrated circuits; DC-DC power converters; Resonant frequency; Frequency control; DC-DC power converters; pulsewidth modulation (PWM); transformers; zero voltage switching (ZVS)
Categories
Funding
- National Natural Science Foundation of China [51977010]
- Beijing Natural Science Foundation [3192033]
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources [LATS17019]
- Key Laboratory of Solar Thermal Energy and Photovoltaic System of the Chinese Academy of Sciences
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A dual-transformer-based LLC resonant converter is proposed in this article, which regulates output voltage through fixed-frequency phase-shift pulsewidth modulation control scheme and designs magnetic components with switching frequency equal to the resonant frequency, achieving soft switching and high efficiency.
In this article, a dual-transformer-based LLC resonant converter is proposed, which is a hybrid combination of a full-bridge and half-bridge LLC circuits. The output voltage is regulated through fixed-frequency phase-shift pulsewidth modulation control scheme, whereas the switching frequency is equal to the resonant frequency, which helps to design the magnetic components. The turns-ratio design of the two transformers is analyzed by the current stress and power distribution of both transformers with two different cases. The proposed converter is capable of realizing soft switching over wide input-voltage and whole load range. Finally, a prototype converter of 1 kW is built and the experiments are conducted under wide input-voltage and full load range. The experimental results show that the proposed converter can achieve high efficiency throughout the full load range.
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