28th June 2018, Thursday
Chairperson: Dr. Lie Xu, Tsinghua University, CHN
|10:00||Fully Optimized Discrete Coupled Inductor DC/DC converter: TriMagiC ConverterTM
Mitsunao Fujimoto, ALPS ELECTRIC CO., LTD., Japan
The TriMagiC ConverterTM is one of the coupled inductor system, its features are fully optimized magnetic components in terms of „Core Loss“ and „size“ by separeted discrete magnetics. And easy magnetic design.
The keys are very low core loss and high flux density magnetic material „LiqualloyTM“ for Choke coil and well designed Mn-Zn Ferrite coupling transformer both
This time we developped Bi-Directional 48V <–> 14V 2.5kW DC/DC converter with this technology and obtained quite high efficincy and small magnetics
|10:25||An Improved Topology Derivation Method for Battery-Integrated DC/DC Converters in Distributed Photovoltaic System
Tiancan Pang, University of North Carolina at Charlotte, USA
This paper proposes a method to derive topologies for battery-integrated DC/DC converters by assembling confirmable subintervals of the aimed topology. When compared with the traditional derivation method of combining two separate converters directly, the derivative process of this method is relatively simpler and the derived topologies are usually more compact and can be readily applied to distributed photovoltaic systems. Simulations in Matlab will be performed to prove the plausibility of the topologies derived by the proposed derivation method.
|11:05||A Novel Carrier-Overlapped PWM Based Voltage Balancing Method for Four-Level Neutral-Point Clamped Converters
Kui Wang, Tsinghua University, China
Neutral-point clamped multilevel inverters with more than three levels are hard to balance the DC-link capacitor voltages, which limits their application in industry. In order to solve the neutral-point potential balancing problem of four-level neutral-point clamped converters, a novel carrier-overlapped PWM is proposed in this paper, which can achieve the natural voltage balance of three DC-link capacitors under ideal and steady states. Moreover, a decoupled neutral-point potential balancing method is also proposed in this paper. The upper and lower DC-link capacitor voltages are balanced by zero-sequence voltage injection and the central DC-link capacitor voltage is balanced by adjusting the duty cycles of three PWM signals slightly. Experimental results are presented to confirm the validity of this method.
||Novel approach for power electronics in efficient DC fast charging systems
Timo Gassauer, SEMIKRON Elektronik GmbH & Co. KG, Germany
Increasing sales of electric vehicles demand a comprehensive density of car charging infrastructure. Fast
DC chargers are a prerequisite for long-distance travel and wide EV adoption. Today’s fast charge points are
developed for a power range up to 350kW. This paper describes the challenges to power electronics,
different possible approaches and a new way of a highly performant power electronics for an efficient DC
fast charging solution. The concept is flexible for single chargers with 50kW as well as multiple charger
stations of tens of 350kW units.