Variable Saturation Inductor-Based Full Bridge Converter With Wide ZVS Range and Reduced Duty Cycle Loss

Gao, Yahu; Tang, Yu; Sun, Haiyan; Guo, Yingjun; Liu, Gangzha; Yang, Huazhong

doi:10.1109/tie.2021.3118414

Cited by 11 publications

(1 citation statement)

References 28 publications

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“…However, the core of the saturated inductor is seriously heated due to its large magnetic flux swing. The PSFB converter in Gao et al 5 uses a variable saturation inductor in series with the transformer. The converter can realize ZVS under light load and reduce the duty cycle loss under heavy load by controlling the energy of the variable saturation inductor.…”

Section: Introductionmentioning

confidence: 99%

Phase‐shifted full‐bridge converter based on an adjustable current auxiliary circuit with full load range ZVS and small duty cycle loss

Gao

Tang

Kan

et al. 2022

Circuit Theory & Apps

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In this paper, a phase-shifted full-bridge converter based on an adjustable current auxiliary circuit is proposed. The converter's switches achieve ZVS with the help of the parallel current provided by the auxiliary circuit. The conduction loss of the parallel current is reduced since the magnitude of the current can be adjusted by the variable inductor. Since there is no additional series inductor, the duty cycle loss of the proposed converter is minimal. Moreover, the oscillating voltage on the secondary side decays quickly, indicating that the energy involved in the oscillation is small, which is beneficial to reduce the loss of the RCD. The experimental platform is built. On this basis, theoretical analysis and experimental verification are carried out in this paper.duty cycle loss, parallel current, phase-shifted full-bridge (PSFB), variable inductor, zerovoltage switching (ZVS) | INTRODUCTIONPhase shifted full bridge converters are widely used in communication, aerospace, and other fields because of their simple structure, ZVS characteristics, high reliability, and other advantages. However, the lagging-leg switches of conventional phase-shifted full-bridge converters cannot realize ZVS under light load, which will reduce the efficiency and cause electromagnetic interference. And the conduction loss of the primary side circulating current increases with the phase shift angle. Moreover, the voltage oscillation on the secondary side diode increases its voltage stress. These disadvantages limit the higher efficiency and higher power density of the PSFB converter.The PSFB converter first proposed in Steigerwald and Ngo 1 has a simple structure, including a full bridge, transformer, rectifier diode, and LC filter. At present, many improved topologies have been proposed to eliminate the above disadvantages. The common method is to increase the inductance in series with the transformer, which can be realized by adding a series inductor or increasing the leakage inductance of the transformer. 2,3 This method can broaden the ZVS range of switches; that is, the switches can realize ZVS under light load. However, the commutation of the primary side current is slow due to the increase of the series inductance, which leads to a large duty cycle loss under heavy load.

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Section: Introductionmentioning

confidence: 99%