Analysis of a Series‑Parallel Resonant Converter for DC Microgrid Applications

Lin, Bor‐Ren

doi:10.3390/pr9030542

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…Another VFRC is the LLCC series-parallel resonant converter [68,69], which uses a full-bridge inverter connected to a half-bridge rectifier and transformer. This converter operates at a high frequency, which allows for a considerable decrease in the size of its magnetic elements.…”

Section: Resonant Dc-dc Power Convertersmentioning

confidence: 99%

Current Source Topologies for Photovoltaic Applications: An Overview

et al. 2022

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Current source topologies have several advantages compared to conventional voltage systems. Their inherent voltage-boosting function, intrinsic short-circuit protection, no electrolytic capacitor, direct-current control, continuous input current, and high reliability make them exceptional candidates for power generation systems, particularly for photovoltaic applications. This study provides an overview of the current source topologies for multi-stage photovoltaic grid-connected systems by comparing the number of components, performance, power-decoupling techniques, efficiency, and frequency operation. The overview reveals gain, performance, energy quality and lifetime improvements, thereby providing current source systems as an attractive alternative for renewable applications.

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Section: Resonant Dc-dc Power Convertersmentioning

confidence: 99%

Current Source Topologies for Photovoltaic Applications: An Overview

et al. 2022

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“…The symmetric resonant circuits are adopted on the primary and secondary sides so that the converter operated at forward power and backward power operations has similar circuit characteristics. The advantages of the resonant converters [17,18] are low switching losses on power devices and low electromagnetic interference. However, the dual resonant converter has less voltage gain so that the available input or output voltage is limited at a finite range.…”

Section: Circuit Schematic Of the Presented Convertermentioning

confidence: 99%

Bidirectional Resonant Converter for DC Microgrid Applications

Lin

2021

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A bidirectional resonant converter is presented and verified in this paper for an electric vehicle battery charger/discharger system. The presented circuit can achieve forward and backward power operation, low switching losses on active devices, and wide output voltage operation. The circuit structure of the presented converter includes two resonant circuits on the primary and secondary sides of an isolated transformer. The frequency modulation approach is adopted to control the studied circuit. Owing to the resonant circuit characteristic, active devices for both forward (battery charge) and backward (battery discharge) power operation can be turned on at zero voltage switching. In order to implement a universal battery charger for different kinds of electric vehicle applications, the DC converter is demanded to have a wide output voltage range capability. The topology morphing between a full bridge resonant circuit and half bridge resonant circuit is selected to obtain high- and low-output voltage range operations so that the 200–500 V output voltage range is realized in the presented resonant converter. Compared to the conventional bidirectional converters, the proposed can be operated under a wide voltage range operation. In the end, a 1 kW laboratory prototype circuit is built, and experiments are provided to demonstrate the validity and performance of the presented bidirectional resonant converter.

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“…However, the CLLC converters has less voltage gain and the output voltage range is limited, such as to V in = 400-600 V and V o = 300-450 V. For the wide voltage variation conditions in solar power and wind power applications, the power converters are normally required to overcome wide solar intensity or wind speed variations. In references [15][16][17][18][19], two-stage converters and PWM or resonant converters with series-parallel connection were studied, to achieve wide voltage operation. However, these circuit topologies can only achieve forward power operation.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Implementation of a Bidirectional Converter with Soft Switching Operation

Lin

2022

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This paper presents a soft switching direct current (DC) converter, with the benefits of bidirectional power conversion and wide-ranging voltage operation for battery charging and discharging capability. A series resonant circuit with variable switching frequency modulation is used to achieve the advantages of soft switching turn-on or turn-off of semiconductor devices. Therefore, the switching power losses in power devices can be reduced. A symmetric resonant circuit topology with a capacitor–inductor–inductor–capacitor (CLLC) structure is adopted to achieve a bidirectional power conversion capability for battery storage units in electric vehicle applications. Due to the symmetric circuit structure on both input and output sides, the converter has similar voltage gains for each power flow operation. In order to overcome the drawback of narrow voltage range operation in conventional resonant converters, a variable transformer turns ratio is adopted in the circuit, to achieve wide output voltage operation (150–450 V) for battery charging applications. To demonstrate the converter performance, a 1-kW laboratory prototype was constructed and tested. Experimental results are provided, to verify the effectiveness of the studied circuit.

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Analysis of a Series‑Parallel Resonant Converter for DC Microgrid Applications

Cited by 9 publications

References 28 publications

Current Source Topologies for Photovoltaic Applications: An Overview

Current Source Topologies for Photovoltaic Applications: An Overview

Bidirectional Resonant Converter for DC Microgrid Applications

Analysis and Implementation of a Bidirectional Converter with Soft Switching Operation

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