Circulating Current and ZVS-on of a Dual Active Bridge DC-DC Converter: A Review

Shao, Shuai; Chen, Hui; Wu, Xinke; Zhang, Junming; Sheng, Kuang

doi:10.1109/access.2019.2911009

Cited by 129 publications

(65 citation statements)

References 84 publications

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“…Hence, regarding Figure 11 and effect of C o , the output signal of the CT is 90 0 lead with respect to i o . Using a variable lagging phase shifter with the same R T1 and C T1 , δ 1 can be derived by (22) which is similar to Equation (12). Therefore, without any change in the previous analysis, C o and the variable low pass filter, effectively suppress the high order harmonics.…”

Section: Simulation Results and Improved Feedback Circuitmentioning

confidence: 99%

“…In addition, a simple control method is proposed which can change the direction of the output power with less transients and power fluctuations. Another advantage is direct control of the phase displacement between the dual active bridges hence; the minimum phase displacement can be achieved simply, which is essential for a DAB-SRC [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Section 4 presents simulation results and modification of the analysis to verify the proposed control method in the transient and steady-state conditions and the main conclusions of the paper are summarized in section 5. The most important problems associated with the state-of-the-art are the power and frequency tuning of these power converters with minimum phase displacement or circulating current [7,[10][11][12]. Current researches are mainly based on algorithms which utilize phase-locked loop (PLL) techniques.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Active Bridge Series Resonant Electric Vehicle Charger: A Self-Tuning Method

et al. 2020

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This paper presents a new self-tuning loop for a bidirectional dual-active bridge (DAB) series resonant converter (SRC). For different loading conditions, the two active bridges can be controlled with a minimum time displacement between them to assure zero voltage switching (ZVS) and minimum circulation current conditions. The tuning loop can instantly reverse the power direction with a fast dynamics. Moreover, the tuning loop is not sensitive to series resonant tank tolerances and deviations, which makes it a robust solution for power tuning of the SRCs. For simplicity, the power is controlled based on the power-frequency control method with a fixed time displacement between the active bridges. The main design criteria of the bidirectional SRC are the time displacement, operating frequency bandwidth, and the minimum and maximum power, which are simply derived and formulated based on the self-tuning loop’s parameters. Based on the parameters of the tuning loop, a simplified power equation and power control method is proposed for DAB-SRCs. The proposed control method is simulated in static and dynamic conditions for different loadings. The analysis and simulation results show the effectiveness of the new tuning method.

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Section: Simulation Results and Improved Feedback Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual-Active Bridge Series Resonant Electric Vehicle Charger: A Self-Tuning Method

et al. 2020

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“…The above discussion infers that PSFB converters deliver actual power to the load only in mode 6. It means that the primary current in the rest of the modes merely circulates within the circuit elements [26]. The only significant duration within this interval is the length of dead time between the devices of the same leg, which is required to ensure zero voltage switching of the devices.…”

Section: B) Modementioning

confidence: 99%

A Modified Higher Operational Duty Phase Shifted Full Bridge Converter for Reduced Circulation Current

Bakar

Bertilsson

2020

IEEE Open J. Ind. Electron. Soc.

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Besides many advantages, the reduction in the operational duty of a traditional phase shifted full converter limits its scope in applications where a wide range of input voltage is the main requirement. Operation with low duty cycle extends freewheeling interval, which results in degraded performance such as more circulating current, increased conduction loss in power devices, narrow range of zero voltage switching and increased EMI. To overcome these drawbacks, this work suggests a modified phase shifted full bridge converter that keeps the operational duty of the converter high for a wide range of input voltage. This cuts the freewheeling interval and improves performance. The proposed converter consists of four low profile transformers having a structure of reconfigurable interconnections. There are two distinct reconfigurable operational modes, a low-gain mode and a high-gain mode, which can be adopted following the variation in line voltage. The proposed work is validated in LTspice simulation and hardware characterization for a wide range of input voltage 100-400 V dc / 12 V out and up to the load power of 1.2 kW. INDEX TERMS Wide range converter, low freewheeling, reduced circulation current, high duty cycle, ZVS, resonant converter, multiple transformers, series transformers, PSFB converter, reconfigurable converter.

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“…Besides, the optimal phase-shift angle to improve converter performance is calculated by numerous parameters such as DC voltages, transmission power, switching frequency and equivalent inductance, and it is difficult to be obtained with variation of parameters during operation. In addition, the calculation of optimal phase-shift angle results in heavy computing burden and increased control complexity [19], [20]. Moreover, the phase-shift control strategies obtain poor performance under light load situation and still can not solve voltages mismatch phenomenon leading to the efficiency decline [21], [22].…”

mentioning

confidence: 99%

Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

Wang

Fan

et al. 2020

IEEE Access

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The modular multilevel high-frequency DC transformer (MDCT) plays an important role in the bus connection, voltage conversion, power transmission and electrical isolation in the DC distribution networks. During practical operation, the mismatch between high-frequency-link (HFL) voltages and HFL transformer voltage ratio caused by the variation of DC bus voltages occurs, resulting in the increased reactive power, larger current stress and decreased efficiency in MDCT. To solve this problem, an adaptive modulation strategy (AMS) is proposed in this paper. The proposed AMS adjusts HFL voltages by varying the number of inserted sub-modules adaptively, ensuring the HFL voltages match HFL transformer voltage ratio. Compared with the conventional phase-shift strategies, the proposed strategy obtains higher transmission power capacity and HFL power factor, and it maintains the ideal efficiency of MDCT under light load situation. Besides, the proposed strategy avoids the optimal phase-shift angle calculation containing numerous parameters, reducing computing burden and improving practicality for MDCT. Moreover, the hybrid-wave modulation in proposed strategy makes HFL voltages compose of quasi-square-wave and square-wave, addressing the dv/dt stress problem and ensuring the higher DC voltage utilization and power transmission capability simultaneously. The mathematical model, operation principle and control architecture of proposed AMS are investigated, and the experimental results in a MDCT prototype verify the correctness and effectiveness of the analysis and proposed strategy.

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Circulating Current and ZVS-on of a Dual Active Bridge DC-DC Converter: A Review

Cited by 129 publications

References 84 publications

Dual-Active Bridge Series Resonant Electric Vehicle Charger: A Self-Tuning Method

Dual-Active Bridge Series Resonant Electric Vehicle Charger: A Self-Tuning Method

A Modified Higher Operational Duty Phase Shifted Full Bridge Converter for Reduced Circulation Current

Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

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