New Isolated Single-Phase AC-DC Converter for Universal Input Voltage

Ming-Rong Lee; Lung-Sheng Yang; Chia-Ching Lin

New Isolated Single-Phase AC-DC Converter for Universal Input Voltage

Ming-Rong Lee

Lung-Sheng Yang

Chia-Ching Lin

Vol. 13, No. 4, pp. 592-599, Jul. 2013

10.6113/JPE.2013.13.4.592

Power factor correction

Discontinuous conduction mode

Universal input voltage

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Abstract

This paper investigates a new isolated single-phase AC-DC converter, which integrates a modified AC-DC buck-boost converter with a DC-DC forward converter. The front semi-stage is operated in discontinuous conduction mode (DCM) to achieve an almost unity power factor and a low total harmonic distortion of the input current. The rear semi-stage is used for step-down voltage conversion and electrical isolation. The front semi-stage uses a coupled inductor with the same winding-turn in the primary and secondary sides, which is charged in series during the switch-on period and is discharged in parallel during the switch-off period. The discharging time can be shortened. In other words, the duty ratio can be extended. This semi-stage can be operated in a larger duty-ratio range than the conventional AC-DC buck-boost converter for DCM operation. Therefore, the proposed converter is suitable for universal input voltage (90~264 Vrms) and a wide output-power range. Moreover, the voltage stress on the DC-link capacitor is low. Finally, a prototype circuit is implemented to verify the performance of the proposed converter.

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Cite this article

[IEEE Style]

M. Lee, L. Yang, C. Lin, "New Isolated Single-Phase AC-DC Converter for Universal Input Voltage," Journal of Power Electronics, vol. 13, no. 4, pp. 592-599, 2013. DOI: 10.6113/JPE.2013.13.4.592.

[ACM Style]

Ming-Rong Lee, Lung-Sheng Yang, and Chia-Ching Lin. 2013. New Isolated Single-Phase AC-DC Converter for Universal Input Voltage. Journal of Power Electronics, 13, 4, (2013), 592-599. DOI: 10.6113/JPE.2013.13.4.592.