Abstract
The conventional zeta inverter has been used for single-phase grid-connected applications. However, it has high switching losses to operate at high switching frequency in the continuous conduction mode (CCM). To address this drawback, this paper suggests a high-efficiency zeta inverter using active clamp and synchronous rectification techniques. The proposed inverter utilizes the active clamp circuit for reducing switching losses. The non-complementary switching scheme is adopted for not only clamping the switch voltage stresses, but also alleviating the circulating energy. In addition, the synchronous rectification is implemented for reducing the body diode conduction of power switches. By using the silicon carbide (SiC) metal oxide semiconductor field effect transistors (MOSFETs), the switching performance of the proposed inverter is improved. Its operation principle and control strategy are presented. A 220-W prototype has been designed and tested to evaluate the performance of the proposed inverter.
Highlights
With the fast growth of renewable energy markets, many single-stage isolated inverters have been developed for single-phase grid-connected applications [1,2,3,4,5,6,7,8,9]
As the zeta inverter operates at a constant switching frequency, it has two operation modes: discontinuous conduction mode (DCM) and continuous conduction mode (CCM)
The DCM zeta inverter has been used for low-power applications [7]
Summary
With the fast growth of renewable energy markets, many single-stage isolated inverters have been developed for single-phase grid-connected applications [1,2,3,4,5,6,7,8,9]. As the power level increases, the DCM zeta inverter suffers from high conduction losses. When the zeta inverter operates in CCM, it can withstand a higher power level than the DCM zeta inverter. T is a high-frequency transformer, which has the magnetizing inductor Lm and the leakage inductor Llk. The CCM zeta inverter has achieved higher efficiency than the DCM zeta inverter by lowering conduction losses [9]. The CCM zeta inverter suffers from high switching losses. The switch SP1 operates at a high switching frequency to regulate the grid current ig. When SP1 is turned off, a high voltage spike is generated due to the energy stored in the leakage inductor Llk , which increases switching losses [10]
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