Investigation of high voltage, high frequency transformers / voltage multipliers for industrial applications

Filchev, T.; Cook, David J.; Wheeler, Patrick; Clare, John

doi:10.1049/cp:20080513

Cited by 11 publications

(3 citation statements)

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“…Compared with the traditional transformers, planar transformers (PTs) have unique advantages including low profile structures and excellent thermal properties. As indispensable components in power converters, PTs are becoming more prevailing and are required to operate in critical applications with smaller sizes, higher frequency and higher efficiency, such as electric vehicles, aviation and renewable energy [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Reduction of leakage inductance and AC resistance of planar transformers by optimising the current distribution

Ren

Zhao

Yang

et al. 2018

IET Power Electronics

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Planar transformers (PTs) are becoming increasingly popular in high-power density, high-frequency SMPS in recent years due to their unique advantages including low profile structures and excellent thermal properties. This study focuses on detailed investigation of the effects of coil current distribution within each winding layer on leakage inductance and AC resistance of a PT, and an analytical derivation based on variational method is given. Then the optimal current distribution is proposed and verified through 3D finite element analysis simulation and physical experiments. The results show that the leakage inductance and AC resistance can be reduced further by optimising the current distribution. Accordingly, a practical implementation method is proposed to control the current distribution within a winding layer by adjusting the widths of conductors.

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Section: Introductionmentioning

confidence: 99%

Reduction of leakage inductance and AC resistance of planar transformers by optimising the current distribution

Ren

Zhao

Yang

et al. 2018

IET Power Electronics

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“…A high voltage gain is difficult to achieve with the traditional topologies of DC/DC converters because of several reasons such as: parasitic components and the requirement of an extreme duty cycles or transformers. This limits the switching frequency and systems size [3]. Some voltage multiplier techniques were also introduced for a boost converter in order to increase the static gain with reduced switch voltage [4].…”

Section: Introductionmentioning

confidence: 99%

A battery-powered single-stage three-phase high step-up converter topology for micro DC-UPS

Lai

2014

IEICE Electron. Express

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A conventional battery-powered AC uninterruptible power supply (AC-UPS) that steps up low DC voltage to high DC voltage and cascades with the high frequency inverter is complicated in control and of low efficiency due to two-stage power conversion. This paper presents a threephase high step-up converter with a single-stage DC/DC power conversion suitable for micro DC-UPS applications. In this paper, the circuit operating theory and steady-state analysis of the proposed topology are first addressed then a 100 V/110 W circuit prototype is designed, built and applied in 24 Vbattery-powered micro DC-UPS for a 19 V/85 W laptop PC appliance. The feasibility and effectiveness of the proposed converter topology are confirmed with experimental results. The maximum conversion efficiency of the proposed converter is about 93.5%, and the overall efficiency of the designed system is high due to the losses in the power conversion process when reduced. Compared with the conventional AC-UPS, the proposed micro DC-UPS achieves potentially about 3% maximum energy savings.

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“…Naturally, the simplest way of solution is to use a high turn-ratio isolation transformer. However, this will induce both voltage/current spikes and rather high losses due to the existence of leakage inductance and stray capacitance [37]. As such, a two-stage approach is proposed to solve this problem [7], [9], [10], [12].…”

Section: Introductionmentioning

confidence: 99%

A Novel Integrated DC/AC Converter With High Voltage Gain Capability for Distributed Energy Resource Systems

Pan

Cheng

Lai

2012

IEEE Trans. Power Electron.

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In this paper, a novel high voltage gain single-stage dc/ac converter is proposed for distributed energy resources. A flyback-type auxiliary circuit is integrated with an isolatedĆuk-derived voltage source inverter to achieve a much higher voltage gain. It is seen that through this integration, the capacitors of the flyback and theĆuk circuits are paralleled for charging and in series for discharging automatically. Due to the capacitive voltage dividing, the dc-side switch voltage stress can be reduced and the losses can be reduced as well. Besides, the low influence of coupling coefficient of flyback-type auxiliary circuit on the inverter characteristic renders the proposed inverter design rather flexible and easy. Steady-state characteristics, performance analysis, simulation and experimental results are given to show the merits of the proposed integrated inverter. Finally, based on the same integration concept, a family of different topologies is also presented for reference.Index Terms-Ćuk-derived voltage source inverter (VSI), distributed energy resource (DER), high voltage gain, single-stage inverter.

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Investigation of high voltage, high frequency transformers / voltage multipliers for industrial applications

Cited by 11 publications

References 0 publications

Reduction of leakage inductance and AC resistance of planar transformers by optimising the current distribution

Reduction of leakage inductance and AC resistance of planar transformers by optimising the current distribution

A battery-powered single-stage three-phase high step-up converter topology for micro DC-UPS

A Novel Integrated DC/AC Converter With High Voltage Gain Capability for Distributed Energy Resource Systems

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