Investigation of a Resonant dc–dc Converter for Light Rail Transportation Applications

Energies

Bor-Ren Lin¹ 

[1] Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan;

关键词: resonant circuit;    zero-voltage switching;    light rail transportation;   

DOI  :  10.3390/en11051078

来源: DOAJ

【 摘 要 】

A high efficiency dc–dc converter is studied for light rail transportation applications on DC microgrid systems. The adopted structure includes two series-connected resonant circuits with single isolated transformer from input 750 V to output 48 V. Two half-bridge resonant circuits and one voltage balance capacitor are used to reduce voltage rating of active devices and to realize split voltages balance. Two series resonant circuits are connected with input-series by single transformer to reduce primary root-mean-square currents. Therefore, power devices with low voltage rating are selected in studied circuit to reduce power loss on sower devices and transformer winding of the isolated transformer. Frequency control approach is adopted to adjust load voltage under different voltage condition and current variations. Since the equivalent resonant tank of the studied circuit is activated under inductive load, active devices are easily operated at zero-voltage switching over wide voltage and current operation range. The feasibility of the studied circuit has been verified with a 1 kW prototype.

【 授权许可】

Unknown