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14th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Wu, Shijie Li, Lei Liu, Weiwei Nanjing Univ Sci & Technol Coll Automat Nanjing Peoples R China

ISBN: (纸本)9781538694909

This article briefly introduces the working principle of dual active half-bridge(DAHB) and the reasons for current mismatch at first, then describes a sensorless current sharing method for two module input-parallel output-parallel(IPOP) connected DAHB converter. This method estimates module parameters ratio by a single perturbation. The duty ratio of the module with larger parameters is compensated by a calculated correction amount according to estimated module parameter ratio. Simulations show that this estimation and compensation method can achieve sensorless current sharing well.

关键词： sensorless current sharing input-parallel output-parallel dual active half-bridge parameter ratio estimation two modules common duty-ratio scheme

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A Control Strategy for input-parallel output-parallel Phase-Shift Full-Bridge DC-DC Converter 5

A Control Strategy for Input-Parallel Output-Parallel Phase-...

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5th International Conference on Power and Energy Technology, ICPET 2023

作者： Yang, Wentie Xu, Lin Zhang, Ping Jiang, Weibin Hubei Key Laboratory of Marine Electromagnetic Detection and Control Wuhan China

ISBN: (纸本)9798350339673

This manuscript proposed a coordinated control method based on droop characteristic for an input-parallel output-parallel (IPOP) phase-shift full-bridge (PSFB) DC-DC converter. By introducing a variable virtual impedance and a DC bias voltage in the control loop, the output current sharing is got, the output voltage drop is compensated, and the circulating current is suppressed. The proposed control strategy is validated by means of a 3-kW experimental prototype with two IPOP PSFB DC-DC converter modules at 100 kHz. And a maximum efficiency of 95.3 % is achieved. © 2023 IEEE.

关键词： Current sharing droop control input-parallel output-parallel phase-shift full-bridge DC-DC converter virtual impedance

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Analysis and Implementation of input parallel output parallel DAHB DC-DC Converters with Sensorless Current Sharing Control Strategy 16

Analysis and Implementation of Input Parallel Output Paralle...

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16th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Chen, Pengwei Li, Lei Liu, Jiale Wang, Yunqiu Ding, Quansen Wu, Shijie Nanjing Univ Sci & Technol Coll Automat Nanjing Peoples R China

ISBN: (纸本)9781665422482

The isolated bidirectional converter dual active half-bridge (DAHB) DC-DC converter consists of two half bridge converters and a high frequency transformer. The DAHB converter has significant features such as high dynamic response, high voltage gain, and zero-voltage soft switching. The series parallel combination of low voltage and small capacity DC-DC converter is a typical scheme to improve the voltage and power level of the converter. However, the complexity and cost increase due to too many current sensors. In view of the current sharing problem in the power module cascaded structure, this paper employs a single phase shift-based sensorless current sharing method for input-parallel output-parallel (DAHB) connected DAHB converter. The converter is analyzed and a 500W IPOP experimental prototype with 50V input voltage and 200V output voltage under 20kHz switching frequency is implemented to verify the theoretical results. Finally, a comparative analysis is given to demonstrate the superiority of the proposed current sharing strategy.

关键词： sensorless current sharing control input-parallel output-parallel dual half-bridge bidirectional DC-DC converter

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IPOP-Connected FB-ZCS DC-DC Converter Modules for Renewable Energy Integration With Medium-Voltage DC Grids

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2019年第5期55卷 5128-5140页

作者： Suryadevara, Rohit Li, Tao Modepalli, Kumar Parsa, Leila Rockwell Automat Milwaukee WI 53204 USA Dialog Semicond Power Convers Business Unit Campbell CA 95008 USA Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA Univ Calif Santa Cruz Dept Elect Engn Santa Cruz CA 95064 USA

This paper presents a dc-dc input-parallel output-parallel (IPOP) converter configuration for renewable energy integration with medium-voltage dc grids. A full-bridge zero-current-switching (FB-ZCS) converter with voltage-doubler output is proposed as the fundamental module. To achieve smooth current commutation and ZCS, the leakage inductance of transformer and a resonant capacitor across its secondary are utilized. This resonant capacitor is always charged to its full-rated capacity irrespective of converter loading and requires a dedicated charging interval resulting in duty-cycle loss. For a given leakage inductance, a large resonant capacitor is required for higher current ratings. With a single-centralized converter, these operational and design constraints result in significant duty-cycle loss, restricting the operation range. This paper proposes an IPOP configuration for high-power applications. Phase shedding at reduced loading ensures that individual modules are operated optimally. input inductance requirement in modules is reduced due to interleaving of the input current. Additionally, voltage stress across converter components and input current ripple are reduced by 50% in the proposed converter modules. Steady-state operation, modeling, current-sharing control, start-up, and shutdown of modules in the IPOP configuration are demonstrated using simulations. Experimental results on a scaled-down prototype are presented to validate its operation.

关键词： DC-DC converter full-bridge high-frequency isolation input-parallel output-parallel medium-voltage dc modular renewables zero-current switching

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Modular Isolated DC-DC Converters for Ultra-Fast EV Chargers: A Generalized Modeling and Control Approach

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ENERGIES 2020年第10期13卷 2540页

作者： ElMenshawy, Mena Massoud, Ahmed Qatar Univ Dept Elect Engn Doha 2713 Qatar

Electric Vehicles (EVs) play a significant role in the reduction of CO2 emissions and other health-threatening air pollutants Accordingly, several research studies are introduced owing to replacing conventional gasoline-powered vehicles with battery-powered EVs. However, the ultra-fast charging (UFC) of the battery pack or the rapid recharging of the battery requires specific demands, including both: the EV battery and the influence on the power grid. In this regard, advanced power electronics technologies are emerging significantly to replace the currently existing gas station infrastructures with the EV charging stations to move from conventional charging (range of hours) to UFC (range of minutes). Among these power electronics conversion systems, the DC-DC conversion stage plays an essential role in supplying energy to the EV via charging the EV's battery. Accordingly, this paper aims to present possible architectures of connecting multiple Dual Active Bridge (DAB) units as the DC-DC stage of the EV fast charger and study their Small-Signal Modeling (SSM) and their control scheme. These are, namely, input-Series output-Series (ISOS), input-Series output-parallel (ISOP), input-parallel output-parallel (IPOP), and input-parallel output-Series (IPOS). The control scheme for each system is studied through controlling the output filter inductor current such that the current profile is based on Reflex Charging (RC). The main contribution of this paper can be highlighted in providing generalized SSM as well as providing a generalized control approach for the input-Series input-parallel output-Series output-parallel (ISIP-OSOP) connection. The generalized model is verified with three different architectures. The control strategy for each architecture is studied to ensure equal power sharing, where simulation results are provided to elucidate the presented concept considering a three-module ISOS, IPOP, ISOP, and IPOS DC-DC converters.

关键词： ultra-fast charging multimodule DC-DC converters dual active bridge DC-DC converter full-bridge phase-shift DC-DC converter input-series output-series input-series output-parallel input-parallel output-parallel input-parallel output-series input-series input-parallel output-series output-parallel

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Analysis of Dual Phase-shifted Full-bridge Converter with Modular Asymmetry

Analysis of Dual Phase-shifted Full-bridge Converter with Mo...

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14th Annual IEEE Energy Conversion Congress and Exposition (IEEE ECCE) / IEEE-Industry-Applications-Society (IEEE-IAS) Annual Meeting

作者： Roja, P. John, Vinod Indian Inst Sci IISc Dept Elect Engn Bangalore Karnataka India

ISBN: (数字)9781728193878

ISBN: (纸本)9781728193878

This paper presents an analysis effort on a dualPSFB converter in IPOP configuration, examining its functional and behavioural aspects under nonideal conditions in the form of parametric asymmetries,viz., duty-ratio, transformer turns-ratio, filter and leakage inductances. The transition mechanism of individual modules into CCM and/or DCM modes as well as their power sharing characteristics amidst module asymmetry are investigated by leveraging per-unitized analytical expressions. The impact of multiple simultaneous asymmetries in the converter under open- and closed-loop settings are examined. Collectively, these analytical examinations not only uncover the parametric sensitivity on performance of the converter modules but also offer a theoretical basis to dual-PSFB operation under practical conditions. The converter analysis and expressions are validated through simulations as well as experimental verification on a laboratory dual-PSFB hardware.

关键词： Phase-shifted full-bridge input-parallel output-parallel parametric asymmetry common duty-ratio control

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