Full-bridge LLC Resonant High-voltage DC–DC Converter with Hybrid Symmetrical Voltage Multiplier

Samsudin, Nor Azura; Ishak, Dahaman

doi:10.1080/03772063.2019.1565954

Cited by 6 publications

(8 citation statements)

References 23 publications

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“…Finally, it should be mentioned that [7] is a good configuration for high-voltage high power applications, but its VM rectifier stage needs more capacitors and lower voltage gain is achieved as compared to the given one here, which has a continues input current with small ripple value instead of a pulsating current waveform.…”

Section: Introductionmentioning

confidence: 94%

A High Step-Up Interleaved Current-Fed Resonant Converter for High-Voltage Applications

et al. 2022

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A current-fed LLC resonant converter is proposed for high-voltage and high-power applications. Here, a two-phase interleaved structure is used in the input stage under the continuous conduction mode (CCM) to effectively reduce the input current and output voltage ripple values and the input filter and the output capacitors volumes. Due to the expandable structure and high voltage gain, the proposed configuration is suitable for high voltage applications since low voltage stresses are applied across its components. In fact, voltage stresses across the power semiconductors, i.e., MOSFETs and output diodes, along with the output capacitors, are almost one-third of the output voltage in the implemented three-stage configuration of the proposed converter. Here, the switching frequency is chosen close to, but less than, the converter series resonant frequency to reduce its different components' current stresses and perform softswitching operation for all power devices under wide input voltage and output power variations. Therefore, conduction and switching losses, and EMI noises are effectively reduced. Consequently, efficiency is improved and high-frequency operation is possible, which reduces the volume of passive components to achieve high-power density. The given topology is thoroughly analyzed mathematically. Also, a 1 kW prototype converter has been implemented to validate the given simulations and analyses. Here, wide input voltage (100 V-200 V) and output power (100 W-1000 W) variations are applied, and an asymmetric pulse width modulation (APWM) technique is used at 143 kHz switching frequency to regulate the output voltage at 1 kV. The obtained maximum efficiency value is 95.3%.INDEX TERMS Asymmetric pulse width modulation (APWM), current-fed converter, interleaved technique, LLC resonant converter, multi-winding transformer.

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Section: Introductionmentioning

confidence: 94%

A High Step-Up Interleaved Current-Fed Resonant Converter for High-Voltage Applications

et al. 2022

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“…Other approaches, such as multiplexer rectifier networks, have been used in [82,83], to multiply the output voltage by factors of 2, 3, and 5. Additional voltage multiplier cells can be found in [64,65,67,[84][85][86], all are suffering from the similar issues as the given one in [ 81 ] . Despite their advantages, these converters exhibit low efficiency under light-load conditions, high voltage stress, and require numerous switches.…”

Section: ) Voltage Step-up Llc Resonant Converter Configurationmentioning

confidence: 99%

Application-Oriented Review of the LLC-Based Resonant Converters

Shahsevani,

Beiranvand

2024

IEEE Access

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The LLC resonant converter is a widely utilized power electronics converter, due to its numerous industrial and domestic applications. This converter offers some advantages such as soft-switching operation of all switches, high efficiency, high power density, low voltage stress, minimal electromagnetic interference (EMI) noise, input/output isolation, wide input/output voltage range, and reliable and good performance under the wide load variation ranges, as well as good light-load operation. However, this converter has certain limitations, which can be addressed to enhance its operation and efficiency. This paper provides an in-depth review and comparison of various LLC-based resonant converter configurations, focusing on their operational principles, mathematical analysis, control methods, and some practical applications including electric vehicle chargers, TV power supplies, LED drivers, photovoltaic cells, HVDC production, fuel cells, and wireless power transfer applications. By examining the strengths and weaknesses of the different LLC resonant converter designs, this study aims to contribute to the ongoing research efforts in improving the performance and efficiency of this important power electronics converter. INDEX TERMS DC-DC power conversion, LLC resonant converter, resonant power conversion.

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“…Due to its voltage filtering, the RTN delivers a sinusoidal voltage V R and the DR-LPF set must be of an inductive nature. The equivalent resistance R ac seen from the input terminals of the DR-LPF set is given by Equation (18), the load quality factor by Equation (19), and PRC voltage gain is given by Equation (20). PRCs can step the output voltage down or up depending on the variation in the control switching system frequency.…”

Section: Parallel Resonant Convertersmentioning

confidence: 99%

“…Resonant DC-DC converters typically contain characteristics that reduce switching losses at the inverter switches and output rectifier diodes, allowing them to operate at higher switching frequencies and yield higher efficiency, resulting in smaller converters. Resonant DC-DC converters come in a variety of topologies, including series resonant DC-DC converters (SRCs), parallel resonant DC-DC converters (PRCs), and series-parallel resonant DC-DC converters (SPRCs) [19]. Due to their simplicity and popularity, many researchers have worked on and recommended resonant converters in various applications [16,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A Review on State-of-the-Art Power Converters: Bidirectional, Resonant, Multilevel Converters and Their Derivatives

et al. 2021

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With the rapid development of modern energy applications such as renewable energy, PV systems, electric vehicles, and smart grids, DC-DC converters have become the key component to meet strict industrial demands. More advanced converters are effective in minimizing switching losses and providing an efficient energy conversion; nonetheless, the main challenge is to provide a single converter that has all the required features to deliver efficient energy for different types of modern energy systems and energy storage system integrations. This paper reviews multilevel, bidirectional, and resonant converters with respect to their constructions, classifications, merits, demerits, combined topologies, applications, and challenges; practical recommendations were also made to deliver clear ideas of the recent challenges and limited capabilities of these three converters to guide society on improving and providing a new, efficient, and economic converter that meets the strict demands of modern energy system integrations. The needs of other industrial applications, as well as the number of used elements for size and weight reduction, were also considered to achieve a power circuit that can effectively address the identified limitations. In brief, integrated bidirectional resonant DC-DC converters and multilevel inverters are expected to be well suited and highly demanded in various applications in the near future. Due to their highlighted merits, more studies are necessary for achieving a perfect level of reducing losses and components.

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Full-bridge LLC Resonant High-voltage DC–DC Converter with Hybrid Symmetrical Voltage Multiplier

Cited by 6 publications

References 23 publications

A High Step-Up Interleaved Current-Fed Resonant Converter for High-Voltage Applications

A High Step-Up Interleaved Current-Fed Resonant Converter for High-Voltage Applications

Application-Oriented Review of the LLC-Based Resonant Converters

A Review on State-of-the-Art Power Converters: Bidirectional, Resonant, Multilevel Converters and Their Derivatives

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