A Soft-Switching Transformer-Less Step-Down Converter Based on Resonant Current Balance Module

Zhang, Xiangjun; Cai, Hongye; Guan, Yueshi; Han, Shouheng; Wang, Yijie; Costa, Marco A. Dalla; Alonso, J.M.; Xu, Dianguo

doi:10.1109/tpel.2020.3042666

Cited by 7 publications

(7 citation statements)

References 37 publications

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“…The circuits in [11][12][13][14][15], with capacitive current balance, are chosen for comparison. In Table 6, the comparison items contain converter type, output count, component count, structure extension, regenerative snubber, switching frequency, resonance, isolation, input voltage, output voltage, and maximum efficiency.…”

Section: Comparisonmentioning

confidence: 99%

“…The study in [15] utilizes the inherent features of the halfbridge series resonant converter to achieve capacitive current balance and dimming, but the current sharing error percentage is large. In addition, the experimental step-up voltage gains used in the studies [11][12][13] and the experimental step-down voltage gains used in [14,15] are not so good.…”

Section: Introductionmentioning

confidence: 97%

“…Accordingly, the passive method is presented based on circuit features to achieve the current balance. This method can be classified into two types: differential-mode transformer [8][9][10] and capacitor [11][12][13][14][15]. Both types generally belong to the SIMO structure, different from single-input single-output (SISO).…”

Section: Introductionmentioning

confidence: 99%

“…The study in [13] displays the non-isolated resonant LED driver with capacitive current balance, but the number of resonant components is increased if the number of outputs increased. The authors in [14] use resonant current balance module to realize capacitive current balance as well as zero-voltage-switching (ZVS) turn-on, but the number of resonant components and switches is increased if the number of outputs increased. The study in [15] utilizes the inherent features of the halfbridge series resonant converter to achieve capacitive current balance and dimming, but the current sharing error percentage is large.…”

Section: Introductionmentioning

confidence: 99%

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Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

2021

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A buck-type light-emitting diode (LED) driver is proposed herein. The proposed LED driver automatically possesses current sharing and high step-down voltage gain. Without complex control, the proposed LED driver, with a single input and multiple outputs, can achieve automatic current sharing of four-channel LED strings, even under the different number of LEDs of each LED string. Furthermore, as compared with the traditional four-phase interleaved buck converter with a single input and a single output having current sharing required, the proposed circuit has the duty cycle up to 0.5, not 0.25, meaning that under the same input voltage the latter has a wider output voltage range than that of the former. Above all, if the proposed circuit with N outputs, then it still has the duty cycle up to 0.5, not one over N as shown traditionally. Moreover, as compared with the current sharing based on the differential-mode transformer, the proposed circuit has no magnetic resetting loop required. In this paper, the operating principles and design considerations of the proposed converter are discussed. Finally, the theoretical analyses and performances of the proposed LED driver are verified by simulation and experiment.

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Section: Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

2021

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“…For stable luminosity of the LEDs, maintaining average LED current at constant is necessary [1] because the luminosity is directly proportional to LED forward current. LEDs are generally arranged in parallel to obtain sufficient luminance, and an effective current balancing method is required [2][3][4][5]. In addition, to match the LED lamp characteristic of a long lifetime, many recent articles propose to drive LEDs without using electrolytic capacitors [6][7][8][9] and adopt an AC-DC converter to drive LEDs from utility power.…”

Section: Introductionmentioning

confidence: 99%

A high power factor LED driver with dual sampling loop feedback control

Lin

Kuo

Leng

et al. 2022

IEICE Electron. Express

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A LED driver with a high Power Factor (PF) under universal AC voltage input is investigated in this paper. The AC/DC buck converter with novel dual sampling loop feedback control is adopted to implement the LED driver application. When the main switch is on interval, the control loop does peak current sampling. When main switch is off interval, the control loop does average current sampling. Two control sampling loops are superimposed to regulate the main switch to adapt the AC input voltage and load alteration. Such a scheme can keep the characteristic of peak current control of fast response and avoid the control delay to bring about over current for damage LED. Compared with the conventional peak current control method, the proposed design does not need zero current detect winding and multiplier. Therefore, the circuit architecture of the proposed driver is cheaper. The proposed driver is applied to a 12W LED to analyze the operational principles and verify the practicality.

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Interleaved step-down converter with capacitor-diode voltage splitter and minimum switches for low current ripple and extra-low voltage ratio

Shen,

Chen,

Liu

et al. 2024

Discov Appl Sci

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This paper proposes an interleaved step-down converter (ISDC) with a capacitor-diode voltage splitter. Even though the ISDC only utilizes two active switches, it can significantly step down a high input voltage to a much lower level and achieve interleaved current at output and continuous current at input without using an extreme duty ratio. In addition, the ISDC is capable of sharing output current equally between two interleaved paths by controlling the two switches. Therefore, the ISDC has lower current ripples and reduces EMI noise. The ISDC can be easily expanded only by adopting capacitors and diodes for a much higher conversion ratio, avoiding using any active switch. A comprehensive analysis of ISDC is presented, including operation principle, steady-state analysis, design consideration, expendability of the power stage, and converter comparison. A prototype of 500 W is fulfilled to deal with 400-V input and 24-V output, which has verified the accuracy of the theoretical analysis and validated the converter. Experimental results demonstrate that the ISDC achieves a peak efficiency of 92.74% at 350 W and 92.09% at full load. If synchronous rectifiers are employed, the peak efficiency can be up to 94.73%.

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A Soft-Switching Transformer-Less Step-Down Converter Based on Resonant Current Balance Module

Cited by 7 publications

References 37 publications

Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

A high power factor LED driver with dual sampling loop feedback control

Interleaved step-down converter with capacitor-diode voltage splitter and minimum switches for low current ripple and extra-low voltage ratio

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