High speed cascode flyback converter using multilayered coreless printed circuit board (PCB) step-down power transformer

Kotte, Hari Babu; Ambatipudi, Radhika; Bertilsson, Kent

doi:10.1109/icpe.2011.5944386

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…There are two primary windings (P1 and P2) in two dissimilar layers that they are linked in series by using via hole. In this case, to achieve better coupling [7] and lessening the leakage inductances, one secondary winding (S) is inserted between the primary windings on the reverse side of the one doubled-side PCB laminate. The number of turns is 24 in all P1, P2 and S consequently the total number of primary turns is 48.…”

Section: Description Of Coreless Pcb Transformermentioning

confidence: 99%

“…It is significant to choose the appropriate components for working in high frequency range. All the parameters have been discussed in [7] in details. In this circuit, the ZXMN10A11G is regarded as a power MOSFET which has drainsource voltage of 100 V with an on-state resistance 'Rds-on' of 350 mX at 'Vgs' of 10 V. The MOSFET driver (LM5111-1 M) has a vital function in the drive power MOSFET.…”

Section: Design and Practical Application Of Fly-back Power Convertermentioning

confidence: 99%

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Design of Coreless PCB Transformer for DC/DC Converter Applications

Hashemi

Ain

Rafiee

2014

The 8th International Conference on Robotic, Vision, Signal Processing &Amp; Power Applications

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This study offered a compact planar, low cost and high density power converter for applications. A fly-back DC/DC converter using a new coreless PCB transformer which operates in MHz band is simulated and fabricated. This is the fact that the size of all passive components such as capacitors, inductors or transformers will be reduced by increasing the frequency. In the proposed transformer, appropriate switching components with high power dissipation level in the vital current/voltage range are chosen so that the efficiency and power of aforementioned converter are improved. The fly-back DC/DC converter uses zero voltage switching (ZVS) technique to reduce switching losses. The assessment of the input and output displays efficiency in the range of 78 %.

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Section: Description Of Coreless Pcb Transformermentioning

confidence: 99%

Section: Design and Practical Application Of Fly-back Power Convertermentioning

confidence: 99%

Design of Coreless PCB Transformer for DC/DC Converter Applications

Hashemi

Ain

Rafiee

2014

The 8th International Conference on Robotic, Vision, Signal Processing &Amp; Power Applications

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“…In the high-frequency converter, using only a single layer of PCB conductors for the transformer is not recommended for high current and low voltage applications [24]; thus, the multilayer coreless PCB transformer is employed to increase the current carrying capacity. From [33], [34], [35], [36], the interleaving structure for the primary and the secondary coils minimizes the leakage inductance and ac winding loss.…”

Section: B Multilayer Coreless Pcb Transformermentioning

confidence: 99%

“…The core and copper losses of the conventional wire-wound transformer are increased due to the skin and proximity effects under high-frequency conditions. In order to eliminate the core losses, a coreless PCB transformer has been getting attention for high-frequency applications, providing isolation and power transfer [22], [23], [24], [25], [26], [27]. Furthermore, the planar PCB transformer reduces the volume and vertical dimension of the power electronic circuits, which increases the power density.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling and Design of 27.12 MHz Single-Switch DC–DC Converter With PCB Transformer

Kwon

Lee

et al. 2023

IEEE Access

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This paper proposes analytical modeling and design of a 27.12 MHz single-switch dc-dc converter with galvanic isolation using a PCB transformer. The ODE-based analytical approach provides a more accurate circuit design by considering the high-order harmonics and non-ideal components such as the diode capacitances. The proposed dimensionless mathematical model simplifies the design of the desired circuit model and requires less tuning procedure. In addition, the effective analytical model offers the design curves to obtain the optimized circuit parameters at any duty ratio. Meanwhile, the multilayer planar PCB transformer is designed to achieve the isolation and high power density for the high-frequency dc-dc converter. Based on Neumann's formula, the analytical model of the PCB transformer is proposed to calculate the inductances for the spiral structure accurately in the high-frequency conditions. As a result, the computational burden for calculating the coil inductances is alleviated using the proposed method. The simulation and experimental results using a 3W converter prototype verify the effectiveness and feasibility of the analytical modeling and design of the proposed converter. Analytical model, high-frequency, planar PCB transformer, single-switch DC-DC converter, soft-switching. INDEX TERMS

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“…In previous works [10], [11], the authors have demonstrated that various multilayered coreless PCB step-down transformers of different turn's ratio evaluated for sinusoidal/square wave excitation are highly energy efficient in the megahertz frequency region. Therefore, these multilayered coreless PCB step-down power transformers were utilized in various single-ended topologies such as flyback, cascode flyback converters [12]- [14] to achieve low-profile converters. However, when these converters are operated in the megahertz switching frequency region, it is recommended to implement the soft-switching techniques such as zero-voltage switching (ZVS)/zero-current switching (ZCS) to reduce the switching losses, which in turn increases the stresses of the MOSFETs and conduction losses [15].…”

mentioning

confidence: 99%

High-Speed (MHz) Series Resonant Converter (SRC) Using Multilayered Coreless Printed Circuit Board (PCB) Step-Down Power Transformer

Kotte

Ambatipudi

Bertilsson

2013

IEEE Trans. Power Electron.

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In this paper, design and analysis of an isolated lowprofile, series resonant converter (SRC) using multilayered coreless printed circuit board (PCB) power transformer was presented. For obtaining the stringent height switch mode power supplies, a multilayered coreless PCB power transformer of approximately 4:1 turn's ratio was designed in a four-layered PCB laminate that can be operated in megahertz switching frequency. The outermost radius of the transformer is 10 mm with achieved power density of 16 W/cm 2 . The energy efficiency of the power transformer is found to be in the range of 87-96% with the output power level of 0.1-50 W operated at a frequency of 2.6 MHz. This designed step-down transformer was utilized in the SRC and evaluated. The supply voltage of the converter is varied from 60-120 V D C with a nominal input voltage of 90 V and has been tested up to the power level of 34.5 W. The energy efficiency of the converter under zerovoltage switching condition is found to be in the range of 80-86.5% with the switching frequency range of 2.4-2.75 MHz. By using a constant off-time frequency modulation technique, the converter was regulated to 20 V D C for different load conditions. Thermal profile with converter loss at nominal voltage is presented.

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High speed cascode flyback converter using multilayered coreless printed circuit board (PCB) step-down power transformer

Cited by 5 publications

References 4 publications

Design of Coreless PCB Transformer for DC/DC Converter Applications

Design of Coreless PCB Transformer for DC/DC Converter Applications

Analytical Modeling and Design of 27.12 MHz Single-Switch DC–DC Converter With PCB Transformer

High-Speed (MHz) Series Resonant Converter (SRC) Using Multilayered Coreless Printed Circuit Board (PCB) Step-Down Power Transformer

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