A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

Huo, Xianxu; Xu, Ke; Liu, Ruixin; Chen, Xi; Li, Zhanchun; Yan, Haiyun

doi:10.3390/en12152905

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…As the bridge voltage reaches V p14 = −V Cs f , the primary current I p14 starts to decay. As a result, the current flowing in secondary rectifiers D 2 , D 4 , D 6 and D 8 decays. To overcome this shortfall, the other secondary rectifiers D 1 , D 3 , D 5 , and D 7 also start conducting, clamp all secondary windings to zero voltage.…”

Section: B) Modementioning

confidence: 99%

“…The full input voltage is impressed on the equivalent leakage inductor, which increases the input current in the reverse direction. As soon as the primary current reaches to the value equal to the reflected load current, the rectifies D 2 , D 4 , D6 , and D 8 turns OFF, while the rectifiers correspond to the second set of secondary windings i.e., D 1 , D 3 , D 5 , and D 7 continue to conduct. After this mode, the load is powered from the source.…”

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confidence: 99%

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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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Section: B) Modementioning

confidence: 99%

mentioning

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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Direct Form Digital Robust RST Control Based on Chebyshev Sphere Optimization Applied in a DC-DC Power Converter

Neves¹,

Walter²,

Medeiros³

et al. 2020

Energies

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This paper presents a novel direct form to design a digital robust control using RST structure (i.e., name given because of the R, S and T polynomials computed) based on convex optimization such as Chebyshev sphere; this approach was applied to a DC-DC Buck converter. This methodology takes into account parametric uncertainties and a Chebyshev sphere constraint in order to ensure robust performance and stability of the system in the discrete domain. For this purpose, a mathematical model for the DC-DC Buck converter is presented when considering uncertainties in electrical variables, such as load resistance, inductance, capacitance, and source voltage variation, also to obtain the discrete model of the system by using the bilinear transformation. The proposed methodology is compared with two other approaches designed in a discrete domain: the classical pole placement and the robust methodology based on the Kharitonov theorem. Wide-ranging experiments are performed in order to evaluate the behavior of the control methodologies when the system is subject to parametric variations of the load resistance and voltage setpoint variation. The results show that the proposed methodology outperforms the other approaches in 90% of the tests and ensures robust stability and robust performance when the system is subjected to a parametric uncertainties family.

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Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

et al. 2021

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The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decrease in the inductance can be noticed. This allows using a smaller magnetic core, increasing the power density of the converter. On the other hand, a detailed description of the magnetization curve including the temperature is required. Since this information is often not included in the inductor’s datasheets, this paper shows how to identify the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig was developed. It consists of a switching converter that encompasses the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core temperatures up to 105 °C. The magnetic core was then characterized by the saturation current vs. inductance, obtaining an expression for the whole family of inductors sharing the same core. Finally, we experimentally analyzed the thermal transient of the inductors in operating conditions, confirming the fundamental role of the temperature in changing the current profiles and the core saturation condition.

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A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

Cited by 3 publications

References 27 publications

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

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

Direct Form Digital Robust RST Control Based on Chebyshev Sphere Optimization Applied in a DC-DC Power Converter

Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

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