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For Dual Active Bridge (DAB) converters a large number of modulation schemes exist, which allow to operate the converter in a wide voltage/power range at a very high efficiency. However, the implementation of these modulation schemes and the transition between the schemes during transient conditions is relatively complicated. Therefore, a simple and flexible concept for generating the PWM signals...
This paper presents a combined phase-shift and frequency modulation scheme of a dual–active-bridge (DAB) ac–dc converter with power factor correction (PFC) to achieve zero voltage switching (ZVS) over the full range of the ac mains voltage. The DAB consists of a half bridge with bidirectional switches on the ac side and a full bridge on the dc side of the isolation transformer to accomplish single-stage...
This paper presents the detailed analysis, optimisation and hardware realisation of an ultra-fast charging station with a split grid storage battery which enables to recharge electric vehicles (EVs) in less than 10 minutes. The station consists of a T-type AC-DC grid interface connected to the 400 V low voltage AC grid, a DC-DC dual active bridge (DAB) isolation stage, a stationary storage battery...
This paper presents a novel isolated cascaded half-bridge converter for medium voltage battery energy storage systems with three phase legs of series connected modules in star connection. Each module consists of a grid-side half-bridge, a battery-side full-bridge and a medium-frequency transformer providing isolation. The presented modulation ensures grid-side zero-current-switching (ZCS) and battery-side...
The paper presents a novel modeling approach of the power flow in a bidirectional dual active bridge DC-DC converter. By using basic superposition principles, the mathematical distinction of cases is avoided in the modeling process of high-frequency transformer currents for different types of modulation. The generalized model is used in an optimization of converter losses of a 3.3 kW electric vehicle...
This paper presents an isolated three-phase bidirectional AC-DC converter with a novel modulation strategy that enables Zero-Voltage-Switching (ZVS) for all switches over the whole AC line period. The AC-DC converter allows the direct coupling of a three-phase AC system with a DC port applying a single high-frequency transformer. A novel modelling approach for the power flows and the derivation of...
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