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In this paper, a novel valley-fill snubber circuit for a three-phase PWM inverter is proposed. One advantage of the valley-fill snubber is that surge voltage suppression is achieved without the power loss that happens in a conventional snubber resister. The second advantage is that ZVS/ZCS operation is realized without using additional active switches. Hence, the proposed snubber circuit is effective...
This paper discusses an optimized switching pattern for reducing an input current distortion of a matrix converter using a space vector modulation. The matrix converter has 27 instantaneous output voltage / input current patterns. In order to keep low input current distortion, the matrix converter always must select optimized switching pattern. A space vector modulation is one of solution of these...
Due to their better figure of merits, gallium nitride field effect transistors (GaN FETs), when employed as the switching devices in power electronics applications, have better performance than conventional silicon metal-oxide-semiconductor field effect transistors (Si MOSFETs). One of the superiorities of GaN FETs is their ability to switch very fast, which results in low switching losses. However,...
This paper proposes a new high-efficiency PV converter for grid connection through a high-leg delta transformer. The converter is composed of a symmetrically-connected boost converter and three half-bridge inverters. One of the three half-bridge inverters is connected to the boost converter, and the others are directly connected to the PV terminals. As a result, this circuit configuration enables...
Traditional energy storage systems consisting of lithium-ion battery cells or electric double-layer capacitors (EDLCs) connected in series require a cell voltage equalizer in addition to a bidirectional PWM converter. The system is prone to complexity as two converters (i.e., the equalizer and bidirectional converter) are separately necessary. To simplify the systems, this paper proposes the transformer-less...
In order to simplify the configuration of photovoltaic (PV) grid-connection system, this paper proposes to adopt a buck-boost dc-dc converter, and then develops a single-phase inverter via the connection with an H-bridge unfolding circuit with line-commutated. Depending on the conditions of dc input-voltage and ac output-voltage, the proposed circuit can work functionally as either a step-down or...
A transformerless high step-down DC-DC converter is presented in this paper. The voltage-divider and switched-inductor techniques are employed to achieve high step-down voltage gain for the proposed converter. For the voltage divider, two capacitors with same capacitance are connected to the DC source. For the switched inductor, two inductors with same inductance are in series at the switch ON-period...
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