ZVS Buck-Boost LLC cascade converter with all soft switched switches

Zhu, Junjie; Qian, Qinsong; Zhan, Chengwang; Lu, Shengli; Sun, Weifeng

doi:10.1080/00207217.2019.1575987

Cited by 5 publications

(8 citation statements)

References 6 publications

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“…Ref. [12][13][14][15][16][17][18][19] utilize the fixed frequency-unregulated LLC as a DC transformer (DCX), so LLC can give full play to its high-efficiency characteristic. Ref.…”

Section: Introductionmentioning

confidence: 99%

A cascaded three‐level buck‐LLC DC/DC converter with high power density for high‐frequency applications

Ji,

Lou,

Hong

et al. 2023

IET Power Electronics

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In distributed generation systems, converters play a vital role and DC/DC converter technology is constantly being promoted with the increasing demand for electrical equipment in various industries. A cascaded topology of DC/DC converter has been proposed in this paper, named three‐level Buck‐LLC(TL‐BLLC) converter. In the proposed TL‐BLLC, Buck and LLC circuit are cascaded by a switch and a diode, so that the input voltage of the LLC can be adjusted to three levels. The stability of the output voltage of the whole system depends on the three‐level weight, so the LLC works at fixed frequency, which simplifies the control and ensures the efficiency. At the same time, compared with the traditional cascaded Buck‐LLC, this structure can reduce the processing power and reduce the size of passive elements of the previous Buck. Finally, a 980 W experimental prototype was established and the results of the experiment verified the correctness of the theoretical analysis.

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“…Ref. [12][13][14][15][16][17][18][19] utilize the fixed frequency-unregulated LLC as a DC transformer (DCX), so LLC can give full play to its high-efficiency characteristic. Ref.…”

Section: Introductionmentioning

confidence: 99%

A cascaded three‐level buck‐LLC DC/DC converter with high power density for high‐frequency applications

Ji,

Lou,

Hong

et al. 2023

IET Power Electronics

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“…The first method is to suppress the noise source or to reduce the spectrum amplitude of the noise source, including frequency-jitter control algorithm [5][6][7], a Correspondence to: Qi Liu. E-mail: lq_seu@126.com *National ASIC System Engineering Research Centre, Southeast University, Sipailou#2, Nanjing, 210096, China **Lianyungang JARI Electronics Co. Ltd, Shenghulu#18, Lianyungang, 222007, China soft switching [8,9], clamping technology, etc. This is the most direct method, but it cannot be implemented in all topologies.…”

Section: Introductionmentioning

confidence: 99%

“…There are mainly several ways to reduce CM noise under the condition of removing the Y‐capacitor. The first method is to suppress the noise source or to reduce the spectrum amplitude of the noise source, including frequency‐jitter control algorithm [5–7], soft switching [8,9], clamping technology, etc. This is the most direct method, but it cannot be implemented in all topologies.…”

Section: Introductionmentioning

confidence: 99%

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

Wang

Shao

Liu

et al. 2021

IEEJ Transactions Elec Engng

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member Y-capacitors are widely used in flyback converters to suppress common-mode (CM) noise to comply with the strict electromagnetic interference (EMI) standards. However, Y-capacitors increase the leakage current between the primary and secondary side, which is not allowed in the applications with high safety requirements. In this paper, the displacement current models of two conventional De-Y methods are quantitatively established to analyze their limitations for the flyback converter. Then, a hybrid EMI-optimized transformer is proposed to improve the limitations. The proposed structure can completely balance the CM noise between the primary and secondary sides, making the flyback converter comply with the EMI standard under the conditions of no Y-capacitor. Compared with the traditional methods, the proposed method has a better capability for CM noise suppression, higher universality and the same cost. Finally, the simulation and experimental results verify that the CM noise of the new transformer structure decreases about 10 dB compared with that of the conventional one.

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“…As a remedy to the above setbacks, many DC‐DC boost converter topologies are proposed recently 8 . Cascaded boost converter gives an opportunity of obtaining high output voltage with less duty ratio 9,10 . Even though it offers individual panel level MPPT, its cascaded structure raises the cost of overall system 11 .…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of solar PV power conversion system through low duty cycle DC‐DC converter

Alagu¹,

Prem²,

Sivaraman³

et al. 2020

Circuit Theory & Apps

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Characteristics like reliability and modularity of solar photovoltaic (SPV) units makes them one of the apt options for generating electric power. However, the input intermittency is their major lacuna, and power electronic circuits are being used to nullify this effect. A solar photovoltaic power conversion process includes a DC-DC converter in the plant side to deliver a fixed DC voltage and a DC-AC converter in the grid side for converting DC voltage in to grid compatible AC voltage. The high duty ratio of typical DC-DC boost converters limits the switching frequency and efficiency. In this article, a way to enhance the performance of a SPV unit using an improved quadratic boost converter (IQBC) is analysed. It can deliver a higher output voltage at lower duty ratio with Perturb and Observe (P&O) algorithm-based Maximum Power Point Tracking (MPPT). A 250 W prototype of IQBC-based Solar PV power conversion system (SPVPCS) is developed, and its performance is compared against conventional and quadratic boost converters and found that the IQBC-based solar power conversion system is efficient and the results are presented. K E Y W O R D S boost converter, duty ratio, improved quadratic boost converter, solar PV conversion, system, voltage gain 1 | INTRODUCTION Renewable energy resources are getting much importance nowadays due to wider exploitation of fossil fuels. 1 Even though there are several renewable energy sources available, wind and solar energy are gaining an edge over the other resources due to their reliability and ability to deliver higher power levels. But it does have a limitation; that is, the input for solar PV system is highly intermittent. This effect of input intermittency can be nullified using power converters. 2,3 DC-DC converters are used to nullify these fluctuations through step up/step down of DC voltage from solar PV panel. Even though higher voltage can be obtained by connecting panels in series, losses due to partial shading and cost will be the drawbacks. 4-6 To achieve voltage boost, a boost converter have to be operated at high duty ratio. While operating the converter in higher duty ratio, issues like high switching voltage stress, limited switching frequency, reverse recovery problem and electromagnetic interference may occur, and also, it affects the efficiency of the converter. 7 As a remedy to the above setbacks, many DC-DC boost converter topologies are proposed recently. 8 Cascaded boost converter gives an opportunity of obtaining high output voltage with less duty ratio. 9,10 Even though it offers individual panel level MPPT, its cascaded structure raises the cost of overall system. 11 SEPIC converter embedded with the MPPT

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ZVS Buck-Boost LLC cascade converter with all soft switched switches

Cited by 5 publications

References 6 publications

A cascaded three‐level buck‐LLC DC/DC converter with high power density for high‐frequency applications

A cascaded three‐level buck‐LLC DC/DC converter with high power density for high‐frequency applications

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

Performance improvement of solar PV power conversion system through low duty cycle DC‐DC converter

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