A Quasi-Two-Stage Isolated Bidirectional Buck-DAB Converter for Wide Input Voltage Range

Lu, Zhengmei; Xu, Guo; Xiong, Wenjing; Sun, Yao; Su, Mei

doi:10.1109/tpel.2022.3208105

Cited by 16 publications

(2 citation statements)

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“…29g-29i demonstrate that α > π/4 results in a generalized drop in converter efficiency. Therefore, maintaining α < π/4 is recommended, not only to reduce B AC Ca,bpk and avoid high variations in the VT parameters (increased L a ), but also to maintain the DAB operating CMP [24] CMP [24] TPS [15] DAB+VT CMP [31] TPS [31] ZETA [32] DAB+Buck [33] tap-changer [20] (b) Efficiency at 20 % of maximum load FIGURE 30: DAB+VT performance comparison under lightload and wide voltage operation with reduced magnetzing inductance. However, for operation under wide voltage and light-load conditions, the implementation of TPS modulation is necessary.…”

Section: Dab+vt Zvs Regionmentioning

confidence: 99%

“…As depicted in Fig. 30b, at 20% of the load, the difference between the different modulation techniques diminishes, however, it is important to notice how DAB + VT presents a superior performance when compared to DAB with a transformer tap changer mechanism in [33] (pentagon marker) and the cascaded DAB plus buck converter in [20] (diamond marker).…”

Section: Dab+vt Zvs Regionmentioning

confidence: 99%

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Dual Active Bridge Converter With Variable Transformer for Wide Voltage and Wide Load Range Operation

Suarez Buitrago,

Cobaleda,

Martinez

2023

IEEE Access

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This study explores the use of a magnetically controlled transformer within a dual active bridge (DAB) converter. This novel approach introduces a new degree of freedom to the control of the topology through the variation of the equivalent turns ratio of its high-frequency transformer. By adjusting the turns ratio, the converter maintains a primary referred DC voltage gain of one, regardless of varying input/output voltages. This theoretical approach represents the simplest solution to achieve minimum effective currents and enable zero voltage switching (ZVS) under light-load conditions, particularly for unmatched voltage scenarios. This paper provides a comprehensive analysis of the converter's currents, output power, efficiency, and their relationship with the magnetic flux density conditions in the transformer. Furthermore, the trade-off between the total turns ratio variation and the circulating currents in the converter is described in detail. Additionally, considering the specific characteristics of this controllable magnetic device, a straightforward modulation strategy to minimize the effective currents under wide output voltage variations is introduced. An experimental prototype with an input voltage of 100V and a rated power of 1.2 kW presents a minimum efficiency of 90% under light-load conditions (5% of the maximum load), considering output voltage variations ranging from 130V to 180V.

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