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

Min-Gi Cho, Sang-Hoon Lee, Hyeon-Seok Lee, Yoon-Geol Choi and Bongkoo Kang
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Min-Gi Cho: Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea
Sang-Hoon Lee: Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea
Hyeon-Seok Lee: Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea
Yoon-Geol Choi: Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea
Bongkoo Kang: Department of Electrical engineering, Pohang University of science and technology, Pohang 790-783, Korea

Energies, 2020, vol. 13, issue 6, 1-19

Abstract: 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 V DC , output voltage of 220 V AC /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.

Keywords: DC-AC power conversion; inverters; harmonic distortion; low cost (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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