High Efficiency Control Method for Non-Isolated Three-Port DC/DC converter

Han Y, Kaiser J, Ott L, Schulz M, Fersterra F, Gosses K, Wunder B, März M (2017)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2017

Event location: Shanghai CN

ISBN: 978-3-8007-4429-9


This paper presents a non-isolated three-port DC/DC converter which is optimized to connect a three-wire, bipolar ±380 VDC microgrid to different sources and loads like photovoltaics, batteries and fuel cells. A novel control method is used to reduce the switching losses and achieve an ex­tremely high efficiency over a broad operating range.

Conventionally, pulse-width modulation (PWM) with a constant switching frequency is used to generate switching pulses. Yet, in order to reduce switching losses and increase the overall system efficiency, Triangular Current Mode (TCM) or Criti­cal Current Mode (CrCM) control is intro­duced to achieve Zero Voltage Switching (ZVS) for every operating point. This also allows the use of higher switching frequencies resulting in greatly reduced passive component sizes.

Conclusively, a 6 kW prototype DC/DC converter is presented to verify the proposed control method. The prototype achieves a peak efficiency of 99.3%.

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Han, Y., Kaiser, J., Ott, L., Schulz, M., Fersterra, F., Gosses, K.,... März, M. (2017). High Efficiency Control Method for Non-Isolated Three-Port DC/DC converter. In VDE (Eds.), Proceedings of the 2017 PCIM Asia. Shanghai, CN.


Han, Yunchao, et al. "High Efficiency Control Method for Non-Isolated Three-Port DC/DC converter." Proceedings of the 2017 PCIM Asia, Shanghai Ed. VDE, 2017.

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