Abstract
This paper presents critical conduction mode (CRM) single-phase transformerless full-bridge inverter in residential photovoltaic (PV) system. CRM full-bridge inverter with bipolar pulse width modulation (PWM) features inherent zero voltage switching (ZVS) capability for the whole line cycle. This enables the inverter to push switching frequency up to hundreds kHz and achieve high power density with high efficiency. However, CRM operation incurs non-constant common mode (CM) voltage during resonant period causing high frequency leakage current. To minimize the leakage current, a new switching modulation strategy is introduced combining CRM and triangular current mode (TCM). The switching modulation scheme alleviates CM voltage by shortening the resonant period and consequently reduces the leakage current. In this paper, the basic operation principle of CRM full-bridge inverter, impacts of CRM operation on the leakage current, and details of the switching modulation method are discussed. Experimental results with laboratory prototype built with E-mode GaN device validate its performance.
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