飞机直流母线电压变换器的平面变压器设计

Design of Planar Transformer with DC Bus Converter for Airplane

针对飞机4 k W直流母线电压变换器输出电流大、变压器二次侧绕组需要并联扩流的要求,设计了一种平面变压器。通过采用适用于倍流整流器的变压器结构,使二次侧并联绕组的匝数增大、电流减小、均流难度降低;通过铜片折叠来实现变压器绕组的方法,使匝间换流接头的面积减小、温升降低;通过一次侧和二次侧绕组的合理交错叠放,使邻近效应导致的附加损耗降低、并联绕组的磁动势环境均衡。实验结果表明:在输出功率为4 k W条件下,所设计的平面变压器温升为40℃,可在70℃的高温环境下正常工作。

In consideration of the fact that 4 kW DC bus converter on airplane has large output current and the secondary winding of its transformer needs in parallel to bear high current, it designed a planner transformer. By adopting a transformer structure adapted to current-double rectifier, the number of turns increases, the current decreases, and the current share becomes easier for the parallel windings. A method to obtain transformer winding by copper fold was proposed, by which the area and the temperature rise of turn-to-turn connectors could decrease. The primary and secondary windings are embedded each other in a reasonable way, which decreases the additional loss caused by proximity effect and keeps the balance of the magnetomotive force of parallel windings. Experimental results show that the planar transformer temperature rise is about 40 ℃ and can work under the conidition of 70 ℃ when the output power is 4 kW.