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Circuit Structure and Control Method to Reduce Size and Harmonic Distortion of Interleaved Dual Buck Inverter

Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea
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Energies 2020, 13(6), 1531; https://doi.org/10.3390/en13061531
Received: 13 January 2020 / Revised: 12 March 2020 / Accepted: 19 March 2020 / Published: 24 March 2020
(This article belongs to the Section Electrical Power and Energy System)
A new circuit structure and control method for a high power interleaved dual-buck inverter are proposed. The proposed inverter consists of six switches, four diodes and two inductors, uses a dual-buck structure to eliminate zero-cross distortion, and operates in an interleaved mode to reduce the current stress of switch. To reduce the total harmonic distortion at low output power, the inverter is controlled using discontinuous-current-mode control combined with continuous-current-mode control. The experimental inverter had a power-conversion efficiency of 98.5% at output power = 1300 W and 98.3% at output power = 2 kW, when the inverter was operated at an input voltage of 400 VDC, output voltage of 220 VAC/60 Hz, and switching frequency of 20 kHz. The total harmonic distortion was < 0.66%, which demonstrates that the inverter is suitable for high-power dc-ac power conversion. View Full-Text
Keywords: DC-AC power conversion; inverters; harmonic distortion; low cost DC-AC power conversion; inverters; harmonic distortion; low cost
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Cho, M.-G.; Lee, S.-H.; Lee, H.-S.; Choi, Y.-G.; Kang, B. Circuit Structure and Control Method to Reduce Size and Harmonic Distortion of Interleaved Dual Buck Inverter. Energies 2020, 13, 1531.

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