단상 태양광 발전용 고효율 벅부스트 하프브리지 인버터 A High-efficiency Buck-boost Half-bridge Inverter for Single-phase Photovoltaic Generation 류 형 민* ★ Hyung-Min Ryu*
j.inst.Korean.electr.electron.eng.Vol.27,No.4,450~455,December 2023
Abstract
Among single-phase photovoltaic inverters that can avoid excessive leakage current caused by the large parasitic
capacitance of photovoltaic panels, a boost converter followed by a half-bridge inverter is the simplest and has
the smallest leakage current. However, due to the high DC-link voltage, the rated voltage of the switching devices
is high and the switching loss is large. This paper proposes a new circuit topology which can operate as a
buck-boost inverter by adding two bidirectional switches to the output side of the half-bridge inverter instead of
removing the boost converter. By reducing two stages of power conversion through the high-voltage DC-link to
one stage, power loss can be reduced without increasing costs and leakage current. The feasibility of the proposed
circuit topology is verified by computer simulation and power loss calculation.
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