6 research outputs found
Highly Efficient Single-Stage DAB Microinverter Using a Novel Modulation Strategy to Minimize Reactive Power
No full textThis article proposes a highly efficient single-stage dual-active-bridge (DAB) microinverter with a novel modulation strategy to minimize the reactive power flow of DAB converter. Using the proposed modulation, the DAB microinverter achieves good controllability and high efficiency with the following features. First, the variable-frequency control algorithm linearizes the nonlinear function of the phase shift angle, enabling a simple closed-loop control for the sinusoidal trajectory tracking. Second, the proposed modulation strategy minimizes the reactive power flow during the switching period while guaranteeing the zero-voltage-switching (ZVS) turn-on of all switches. With minimized reactive power, current stress and power losses are significantly reduced. Thus, the DAB microinverter achieves a maximum efficiency of 96.87%. Third, the proposed phase shift angles and switching frequency are obtained in an analytic form, thereby that they are computationally simple and easy to implement. The operation principle of the proposed modulation strategy is theoretically analyzed and verified. Experimental results based on a 330-W prototype module are conducted to evaluate the performance of the proposed inverter and to verify the analysis.11Nsciescopu
Highly Efficient Single-Phase Three-Level Three-Leg Converter Using SiC <sc>mosfet</sc>s for AC–AC Applications
No full textBidirectional push–pull/H‐bridge converter for low‐voltage energy storage system
No full textAbstract A bidirectional push–pull/H‐bridge DC/DC converter for a low‐voltage energy storage system is proposed in this paper. It comprises the push–pull converter, the phase‐shifted H‐bridge converter, and the transformer. The push–pull converter is connected to the low‐voltage side, and it is controlled by 0.5 fixed duty ratio. The phase‐shifted H‐bridge converter is connected to the high‐voltage side, and it is controlled by an extended phase shift scheme with zero voltage switching (ZVS). Compared with the conventional dual active bridge (DAB) DC/DC converter, the proposed converter has a simple structure—there are only two power switches with a common ground and simple gate‐driving circuits in the low‐voltage side. The 600‐W laboratory prototype was developed to confirm the theoretical analysis and the validity of the proposed converter
Reverse Current Elimination for Capacitor Voltage Balanced Bidirectional Resonant Converter Using a Bidirectional Switch
No full text
