Abstract
In this paper, design and optimization method of a three-phase dual-active-bridge DC/DC converter is discussed. Three single phase transformers connected in star-star configuration were designed with large leakage inductance aiming to eliminate the need for external inductors. Switching frequency, peak flux density, number of turns, number of layers, etc., were optimized using non-linear programming technique for minimizing the overall converter loss. Experimental results on a 10 kW prototype show that the optimized converter can operate efficiently an efficacy of up to 98.65% and a low-temperature rise of less than 70 degrees Celsius on both transformers and semiconductor devices.
Highlights
Electric vehicles (EVs) play an importance role in reducing CO2 emission, as they are powered by chemical batteries or super capacitors, rather than by fuel combustion
The EV would be connected to the utility via a so-called EV supply equipment (EVSE) and a charging outlet when it is not in used in a quite long time
This paper focuses on designing and optimization of the bidirectional DC/DC converter of such an EVSE
Summary
Electric vehicles (EVs) play an importance role in reducing CO2 emission, as they are powered by chemical batteries or super capacitors, rather than by fuel combustion. This paper focuses on designing and optimization of the bidirectional DC/DC converter of such an EVSE ( on, the DC charger) From another aspect, according to [3], high frequency current ripple causes negative effect on the battery lifetime. In [13], the inductor-integrated transformer in a single-phase DAB converter was designed and optimized by using the particle swarm optimization method. Design and optimization of three-phase DAB converter for DC charging applications are resolved in this paper. Both transformer structure and operation parameters are optimized.
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