Performance optimization of a high current dual active bridge with a wide operating voltage range

Abstract

The main aim of this paper is to improve the performance of high current dual active bridge converters when operated over a wide voltage range. A typical application is for fuel cell vehicles where a bi-directional interface between a 12V battery and a high voltage DC bus is required. The battery side voltage ranges from 11V to 16V while the fuel cell is operated between 220V and 447V and the required power is typically 1kW. Careful analysis shows that the high currents on the battery side cause significant design issues in order to obtain a high efficiency. The standard phase shift modulation method can result in high conduction and switching losses. This paper proposes a combined triangular and trapezoidal modulation method to reduce losses over the wide operating range. Approximately, a 2% improvement in efficiency can be expected. An experimental system is used to verify the improved performance of the dual active bridge using the proposed advanced modulation method. I.

Reactive Power and Soft-Switching Capability Analysis of Dual-Active-Bridge DC-DC Converters with Dual-Phase-Shift Control

“…10 shows the ZVS condition of the primary side leg switch, Q 14 , for "P o =100W" and "d=1.8". It is easy to find that the ZVS condition is achieved for the Q 13 , Q 14 leg of the primary side, which shows that the DPS will help to increase the number of legs with ZVS performance, as shown in Fig. 10 (c).…”

“…These include a phase-shift plus pulse width modulation (PSPWM) control strategy [8], [11]- [12], triangular modulation (TRM) [13], trapezoidal modulation (TZM) [14] and hybrid modulation [15]. In addition, the pulse-skipping control strategy is also proposed for grid-tied converter applications to improve the efficiency for light loads [16].…”

Implementation of Bidirectional LLC Resonant Converter for RES with Automatic Transition

“…Two low-side circuit topologies were then selected for hardware implementation. One is the L-type half-bridge current-fed converter, and the other is full-bridge current-fed converter.The main aim in the paper [5] is to improve the performance of high current dual active bridge converters when operated over a wide voltage range. A typical application is for fuel cell vehicles where a bi-directional interface between a 12 V battery and a high voltage DC bus is required.Careful analysis shows that the high currents on the battery side cause significant design issues in order to obtain a high efficiency.…”

A Novel Compensator for Eliminating DC Magnetizing Current Bias in Hybrid Modulated Dual Active Bridge Converters

“…However, SPSM fails to provide a good efficiency characteristic when the voltage transfer ratio increases, especially at light loads [5]. When the performance of microcontrollers was improved and many of them were commercialized with moderate pricing, some complex control methods like triangular modulation (TRM), modified triangular modulation (MTRM) [6], and trapezoidal modulation (TZM) were proposed to improve the light load efficiency of DAB converters when the voltage transfer ratio increases [7]. Nowadays, in applications which require a large voltage transfer ratio, hybrid modulation which employs both SPSM and TRM is always used.…”