دانلود رایگان مقاله انگلیسی طراحی و تحلیل یک مبدل LLC DC-DC برآمده برای ملزومات نیروی کمکی در کشش - اشپرینگر 2018

Abstract.

This paper focuses on an 8 kW LLC resonant full bridge DC-DC converter topology using a high frequency transformer for auxiliary power supply systems in traction. The full bridge DC-DC converter with the LLC resonant network has been tested under hard switching and zero current switching conditions with 100 kHz switching frequency. In addition to this, an observation made for the effect of dead time variation of the power switches to improve the overall system efficiency. This paper describes the efficiency of the ZCS full bridge converter by considering different input power levels and also compared with hard switched topology. This paper presents the operating principles, simulation analysis, and experimental verification for 3 kW to 8 kW LLC resonant full bridge converter with 1200 V/40 A IGBTs, and its efficiency comparison.

6. Conclusion

This paper presented an 8 kW LLC resonant full bridge resonant DC-DC converter suitable for auxiliary drives in traction application with maximum efficiency 95.5%. Maximum output power of resonant converter is 8 kW with 100 kHz switching frequency has been simulated and laboratory tests were investigated for the ZCS resonance in order to show the performance of the overall system efficiency. The hard switching full bridge DCDC converter has maximum efficiency 92.9% and ZCS resonant converter has maximum efficiency about 95.5% achieved with the DC bus voltage at 400 V. By varying the dead time interval between the power switches in the ZCS operating region, the system efficiency improved to 2.2% than the conventional converter. The experimental results were performed for steady state condition, the efficiency of the resonant converter shows that it has better performance than hard switched topology.