Adaptive Driving Scheme for ZVS and Minimizing Circulating Current in MHz CRM Converters

Wang, Kangping; Zhu, Hongkeng; Wu, Jianpeng; Yang, Xu; Wang, Laili

doi:10.1109/tpel.2020.3025810

Cited by 26 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, with the application of wide-bandgap devices and soft-switching technology, the switching frequency has been continuously pushed up to the MHz frequency [3,4]. At MHz frequency, planar transformers based on PCB windings have been widely studied and applied due to their advantages of high power density, good consistency, and easy interleaving of windings, etc.…”

Section: Introductionmentioning

confidence: 99%

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

Wang

Gao

Guo

et al. 2023

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

In MHz and high current applications, planar transformers face problems such as significant winding loss and limited winding current-carrying capacity, which seriously restrict converter's efficiency and power density improvement. This paper proposes a fractional-turn planar transformer structure and embeds key power devices into the transformer. The proposed method can significantly shorten the winding length, thus reducing winding losses. At the same time, the high integration of the transformer and key power devices can effectively reduce the overall volume of the converter and eliminate terminal losses. The analysis and optimization of the proposed integrated fractional-turn transformer are presented in detail. Finally, a 380V-12V 1kW unregulated LLC is built with the proposed integrated transformer. The full-load efficiency is 97.7%, and the power density is 99W/cm 3 , both of which are the highest among the state-of-the-art prototypes with similar specifications. 1

show abstract

Section: Introductionmentioning

confidence: 99%

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

Wang

Gao

Guo

et al. 2023

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…Mode-hopping technique with load current detection is proposed to improve efficiency based on power loss analysis of converter. 26 Frequency modulation is adopted in previous works [27][28][29][30] based on external analogic circuitry to detect zero crossings of either inductor current or switch node voltage and adjusting timing parameters based in these information. Lookup-table-based approaches that adjust switching frequencies is presented in Sang Hee Kang et al 31 to achieve efficiency optimization of flyback converter.…”

Section: Introductionmentioning

confidence: 99%

Real time online efficiency optimization of buck converter against variable voltage and load change

Chen

Tang

et al. 2022

Circuit Theory & Apps

View full text Add to dashboard Cite

In order to address the issue of keeping the converter operating at a high efficiency level under different conditions, this paper suggests an adaptive step frequency adjustment online optimization search algorithm, which achieves the goal of fast adjustment and real‐time response to parameter changes. The converter is quickly adjusted to operate at a high efficiency by sampling the input and output current values and modulating the switching frequency utilizing the algorithm. Additionally, the algorithm shifts between two working models to finish the search for the best switching frequency while the converter's characteristics do not change. Moreover, it accomplishes the objective of instantly resynchronizing the algorithm after a change in the converter's parameters and starting a search for the best switching frequency in the new converter state. For various input voltages and output loads, the operating principle, optimal frequency, and efficiency are given. In addition, the principle analysis when the converter parameters are changed is provided, and the choice of two algorithm models is compared. Finally, a prototype buck converter with adjustable input voltage and load is constructed to test the algorithm's efficiency.

show abstract

Adaptive Tuning Method for ZVS Control in GaN-based MHz CRM Totem-Pole PFC Rectifier

Zhu

Wang

et al. 2021

2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

Adaptive Driving Scheme for ZVS and Minimizing Circulating Current in MHz CRM Converters

Cited by 26 publications

References 12 publications

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

Real time online efficiency optimization of buck converter against variable voltage and load change

Adaptive Tuning Method for ZVS Control in GaN-based MHz CRM Totem-Pole PFC Rectifier

Contact Info

Product

Resources

About