High-Frequency and High-Efficiency Isolated Two-Stage Bidirectional DC–DC Converter for Residential Energy Storage Systems

Liu, Yuchen; Chen, Chen; Chen, Kai-De; Syu, Yong-Long; Dung, Nguyen Anh

doi:10.1109/jestpe.2019.2953117

Cited by 39 publications

(28 citation statements)

References 37 publications

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“…According to (5), the relationship between the voltage gain M (M = V o /V i ) and the duty cycle D 1 and D 2 can be illustrated, as shown in Figure 9, as well as some critical points. According to (9), the voltage stress on switch S 2 is 2V C + V o , which may be higher than the input voltage V i , and the corresponding point B (i.e.…”

Section: Optimal Operating Regionmentioning

confidence: 99%

“…The inductor current ripple coefficient is defined as γ L = Δi L /I L , and γ L1 = γ L2 = γ L is set for simplifying the calculation. Substituting (12) into W = LI 2 /2, and combining (5) to (8) to express all voltage and current steady-state values with output voltage V o , then the inductor capacity of L 1 and L 2 /L 3 can be derived as (14). In order to investigate the effect of duty cycle on the inductor capacity, the normalized total capacity ΣW* is obtained by normalizing (14), as shown in (15).…”

Section: Optimal Operating Regionmentioning

confidence: 99%

“…If the input voltage V i and the output voltage reference V ref are known, the optimal operating point can be selected according to the actual requirements of efficiency and volume. According to (5), the capacitor voltage V C and duty cycle D 2 at this operating point are derived, and then the duty cycle…”

Section: Figure 14 Control Block Diagram Of L-sc-sl-bcmentioning

confidence: 99%

“…Isolated DC/DC converters [5,6] can be employed to achieve high step-down ratios by adjusting the turns ratio of the transformer. Among them, the LLC resonant converter [6] is popular due to its simple structure and wide soft-switching capability.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the optimal operation and control strategy of a wide‐range switched‐capacitor/switched‐inductor DC/DC converter

et al. 2022

IET Power Electronics

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Wide‐range DC/DC converters are widely used in telecommunications, electric vehicles, and e‐bikes. In this paper, the operation characteristics of the wide‐range cascaded buck converter with two duty cycles are investigated. The operation principle of switched‐capacitor and switched‐inductor is analyzed to ensure that there are no current or voltage spikes in the system and no additional control is required for them. Based on the volume and efficiency performance indexes, the optimal operating region of the converter should be selected to the left side of the minimum sum point of the two duty cycles. The small signal model of the converter is established, then a control strategy is proposed that the first‐stage duty cycle is directly given based on the optimal operating region, and the second‐stage duty cycle is determined by double closed‐loop control, which has good control performance, economy, and simplicity. The prototype achieved the conversion of 32 to80 V to 5 V/6 A with peak efficiencies of 92.4%/80 V, 93.8%/48 V, 94.5%/32 V. The results proved that the control strategy enables the converter to realize high efficiency and rapid dynamic regulation even in the condition of high voltage gain and wide input range.

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Section: Optimal Operating Regionmentioning

confidence: 99%

Section: Optimal Operating Regionmentioning

confidence: 99%

Section: Figure 14 Control Block Diagram Of L-sc-sl-bcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation on the optimal operation and control strategy of a wide‐range switched‐capacitor/switched‐inductor DC/DC converter

et al. 2022

IET Power Electronics

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“…For the second-stage DC-DC converter of the two-stage electric vehicle charger [3,5], a symmetric full-bridge CLLLC resonant converter for charging and discharging batteries is proposed. Compared with variable frequency control of traditional bidirectional DC-DC converter, in this study the hybrid switching with dual control strategy was employed to achieve zero voltage and zero current switching of bidirectional buck and boost mode.…”

Section: Introductionmentioning

confidence: 99%

Reversible hybrid control resonant converter for electric vehicle battery charging and discharging system

Chen

Chiou

et al. 2022

The Journal of Engineering

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In this study, the control modes in the newly designed converter include a variable frequency control mode, a phase shift control mode, and hybrid switching with a dual control mode. Compared with the traditional resonant converter, the newly designed converter has the following characteristics: (1) Zero voltage and zero current soft switching to improve converter efficiency in forward and reverse mode and wide voltage range, (2) solves the problem of voltage adjustment being difficult and switching loss increasing at light load for the resonant converter under the variable frequency control mode, (3) hybrid switching with a dual‐control strategy to resolve the design difficulty of digital control in hybrid switching control mode, (4) a closed loop control for the resonant converter with hybrid switching and dual‐ control mode. Finally, In the forward charging mode, the input voltage is 400 V, the output voltage is 250–450 V, the maximum power is 1000 W, and the maximum efficiency is 96.69%. In reverse discharge mode, the input voltage is 250–450 V, the output voltage is 400 V, and the efficiency at full load is 95.13%. The maximum conversion efficiency is 97.57% when the output power is 840 W.

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Review of bidirectional DC–DC converter topologies for hybrid energy storage system of new energy vehicles

Wang

Wang²,

Zhang³

et al. 2022

Green Energy and Intelligent Transportation

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High-Frequency and High-Efficiency Isolated Two-Stage Bidirectional DC–DC Converter for Residential Energy Storage Systems

Cited by 39 publications

References 37 publications

Investigation on the optimal operation and control strategy of a wide‐range switched‐capacitor/switched‐inductor DC/DC converter

Investigation on the optimal operation and control strategy of a wide‐range switched‐capacitor/switched‐inductor DC/DC converter

Reversible hybrid control resonant converter for electric vehicle battery charging and discharging system

Review of bidirectional DC–DC converter topologies for hybrid energy storage system of new energy vehicles

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