Design and Implementation of a Two-Stage Resonant Converter for Wide Output Range Operation

Zanatta, Nicola; Caldognetto, Tommaso; Biadene, Davide; Spiazzi, G.; Mattavelli, Paolo

doi:10.1109/tia.2022.3199195

Cited by 12 publications

(14 citation statements)

References 42 publications

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“…Numerous approaches and methods to overcome the limitations of these frequency-modulated resonant converters are reported in the literature [12], [18], [21]. Herein are summarized the main relevant methods.…”

Section: B Literature Overviewmentioning

confidence: 99%

“…Herein are summarized the main relevant methods. Solutions include variants in the conversion circuits related to the primary-side [22], [23], [24] or the secondary-side [25], [26], [27], [28], [29], the resonant tank [30], [30], [31], [32], the application of strategies like the partial-power processing [8], [12], [33], [34], [35], [36], [37], [38], [39], [40], [41], and the design of structures using multiple stages of conversion [21], [42], [43], [44]. Converters that adopt reconfigurable structures as described, for example, in [20], [22], [26], [28], can obtain wide voltage gain, but achieving smooth transitions between the different configurations may be difficult to cope with.…”

Section: B Literature Overviewmentioning

confidence: 99%

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A Two-Stage DC-DC Isolated Converter for Battery-Charging Applications

Zanatta

Caldognetto

Biadene

et al. 2023

IEEE Open J. Power Electron.

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This paper proposes and analyzes a two-stage dc-dc isolated converter for electric vehicle charging applications, where high efficiency over a wide range of battery voltages is required. The proposed conversion circuit comprises a first two-output isolation stage with CLLC resonant structure and a second two-input buck regulator. The transformer of the first stage is designed such that its two output voltages correspond, ideally, to the minimum and maximum expected voltage to be supplied to the battery. Then, the second stage combines the voltages provided by the previous isolation stage to regulate the output voltage of the whole converter. The first stage is always operated at resonance, with the only function of providing isolation and fixed conversion ratios with minimum losses, whereas the second stage allows output voltage regulation over a wide range of battery voltages. Overall, it is shown that the solution features high conversion efficiency over a wide range of output voltages. This paper comprehensively describes the solution, including modeling, analyses, design considerations for the main circuit components (e.g., magnetics, switches), and modulation choices. Experimental results are reported considering a converter module prototype rated 10 kW, input voltage 800 V, and output range 250 V to 500 V, employing silicon-carbide and gallium-nitride semiconductors.

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Section: B Literature Overviewmentioning

confidence: 99%

Section: B Literature Overviewmentioning

confidence: 99%

A Two-Stage DC-DC Isolated Converter for Battery-Charging Applications

Zanatta

Caldognetto

Biadene

et al. 2023

IEEE Open J. Power Electron.

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“…The phase-shift is modulated to reduce the current ripple in the buck-boost inductor. Similarly, in [3] and [4], the converter is used with push-pull rectifier and full-bridge rectifier, respectively, with the bipolar symmetric phase-shift modulation. In these applications the shared leg duty-cycle is fixed at 50% and the E. Gallo, D. Biadene, and T. Caldognetto are with the Department of Management and Engineering, University of Padova, Vicenza, Italy (e-mail: ezio.gallo@phd.unipd.it, tommaso.caldognetto@unipd.it, davide.biadene@unipd.it).…”

Section: Introductionmentioning

confidence: 99%

An Energy-Based Model of Four-Switch Buck–Boost Converters

Gallo,

Biadene,

Cvejić

et al. 2024

IEEE Trans. Power Electron.

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The four-switch buck-boost (FSBB) topology is often used in combination with other isolated converters to extend the voltage range capability of the overall structure. In such applications, the duty-cycles of the two legs of the FSBB are independently controlled, and a phase-shift is typically used to shape the inductor current ripple and thus achieve zero voltage switching. This paper proposes a nonlinear average model, and the corresponding linearized small-signal model for the FSBB operating in the described way. Notably, the proposed approach is based on the modeling of the inductor energy, which allows the correct description of the dynamics related to the phase-shift, in addition to those related to the duty-cycles. The derived models are shown to be in excellent agreement with simulation results and are also validated by measurements on an experimental prototype.

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“…Its application is limited to the LED driver. A similar two-stage converter with buck-boost topology is proposed for wide output voltage range in [22]. The losses are still roughly evaluated and the LLC stage operates only at the resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

A Control Strategy Based on Intermediate Bus Voltage Information for Wide-Range High-Efficiency Step-Up DC–DC Converters

Lu,

Sun,

Guo

2023

IEEE Access

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With the increasing utilization of renewable energy generation, especially photovoltaic (PV) power generation, the technology for wide-range high-efficiency DC-DC converters is becoming increasingly important. This paper focuses on the control of high-efficiency step-up DC-DC converters with the multiphase Boost and LLC (MPBLLC) converter. A control strategy based on intermediate bus voltage information is proposed to improve the efficiency over a wide input voltage range. The operation principle and the time domain model of the converter are analyzed first. Since the loss models in previous studies are not accurate and comprehensive enough, a loss modeling method for the variable voltage is proposed. It is based on the time domain analysis (TDA) and is available for a wide voltage range. By analyzing the level and influence factors of variables in the MPBLLC converter, a fast algorithm for loss modeling is also proposed. Further, the control strategy including the optimal bus voltage control is proposed for MPBLLC converter. Control modes are analyzed in detail. For the key part, four different control approaches are presented based on different variations of the intermediate bus voltage. Above all, the optimal bus voltage control is proposed based on the proposed variable bus loss model. Finally, a 500-W experimental prototype is built to verify the effectiveness of the proposed loss model and control strategy, which demonstrates good performance and high efficiency over a wide input voltage range.INDEX TERMS Loss modeling, control strategy, high efficiency, intermediate bus voltage information, multi-phase Boost and LLC (MPBLLC) converter, wide input voltage range.

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Design and Implementation of a Two-Stage Resonant Converter for Wide Output Range Operation

Cited by 12 publications

References 42 publications

A Two-Stage DC-DC Isolated Converter for Battery-Charging Applications

A Two-Stage DC-DC Isolated Converter for Battery-Charging Applications

An Energy-Based Model of Four-Switch Buck–Boost Converters

A Control Strategy Based on Intermediate Bus Voltage Information for Wide-Range High-Efficiency Step-Up DC–DC Converters

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