一种改进的零电压零电流倍流整流变换器

An Improved Zero-Voltage Zero-Current Switching Converter With Current-Doubler-Rectifier

提出一种改进型的移相全桥零电压零电流倍流整流变换器。采用变压器和隔直电容串联,滞后桥臂串联二极管,使其超前桥臂实现零电压开通,滞后桥臂实现零电流关断,与滞后桥臂串联的二极管也实现零电流关断,二次侧整流二极管也是自然关断,变换器所有的功率器件都有较大的软开关范围,文中还简单讨论了软开关范围和参数设计。最后,采用峰值电流控制,电压外环、电流内环的控制方案,研制2.5kW的软开关全桥变换器,并给出实验结果。

An improved phase-shift full-bridge zero-voltage zero-current switching （ZVZCS） converter with current doubler rectifier is proposed. By using a DC-block capacitor in series with the transformer and a diode in series with the lagging-leg, zero-voltage switching for the leading-leg and zero-current switching for the lagging-leg can be achieved respectively. The diodes in series with the lagging-leg are turned off under the zero current condition, and the rectifier diodes in the secondary side were turned off naturally. All the power semiconductors in the converter are operated with wide range soft-switching condition, and the soft-switching operating range and the parameters design are discussed simply. Finally, employing the outer voltage control loop and inner current control loop schemes with the peak current mode control, a 2.5kW soft-switching full bridge converter is implemented, and the experimental results are also presented.