Investigation of transformer winding architectures for high voltage capacitor charging applications

Schneider, Henrik; Thummala, Prasanth; Huang, Lida; Ouyang, Ziwei; Knott, Arnold; Zhang, Zhe; Andersen, Michael A. E.

doi:10.1109/apec.2014.6803330

Cited by 8 publications

(11 citation statements)

References 25 publications

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“…Sectioning the transformer significantly reduces the self-capacitance of the high voltage winding [32]. A 0.5 mm triple isolated (TEX-E) solid wire is used for the primary winding, and 0.1 mm normal single insulated solid wire is used for the secondary winding.…”

Section: Resultsmentioning

confidence: 99%

“…In [31] an efficiency optimization technique is proposed for a bidirectional flyback converter used to drive capacitive actuator. Several transformer winding architectures have been investigated in [32] for the high voltage capacitor charge and discharge application. A digital control technique to achieve the valley switching in a bidirectional flyback converter is proposed in [33].…”

Section: A Cmentioning

confidence: 99%

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Design of a high voltage bidirectional DC-DC converter for driving capacitive incremental actuators usable in electric vehicles (EVs)

Thummala

Zhang

Andersen

et al. 2014

2014 IEEE International Electric Vehicle Conference (IEVC)

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Abstract-This paper presents the design of a low input (24 V) and variable high output voltage (0-2.5 kV) bidirectional dc-dc converter for driving a capacitive actuator. The topology is a digitally controlled bidirectional flyback converter with a variable frequency control. The objective is, to design the converter for efficiently charging and discharging the capacitive actuator from 0 V to 2.5 kV and vice versa, respectively. The converter is used to drive a dielectric electro active polymer (DEAP) based capacitive incremental actuator, which has the potential to be used in automotive (e.g., EVs), space and medical industries. The design of the bidirectional flyback converter to charge and discharge a 400 nF capacitive actuator is presented, when 4 kV and 4.5 kV high voltage MOSFETs are used on the secondary high voltage side. The experimental results and efficiency measurements of the converter with the proposed design are provided. Keywords

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Section: Resultsmentioning

confidence: 99%

Section: A Cmentioning

confidence: 99%

Design of a high voltage bidirectional DC-DC converter for driving capacitive incremental actuators usable in electric vehicles (EVs)

Thummala

Zhang

Andersen

et al. 2014

2014 IEEE International Electric Vehicle Conference (IEVC)

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“…The implemented winding scheme is U-type, which helps to decrease the distance between windings in order to reduce the structure leakage inductance. However, this arrangement will produce higher capacitive loss than the Z-type winding [12]. Fig.…”

Section: Leakage Inductance Ac Resistance and Stray Capacitancementioning

confidence: 99%

Analysis and comparison of magnetic structures in a tapped boost converter for LED applications

Mira

Knott

Andersen

2014

2014 International Power Electronics and Application Conference and Exposition

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Abstract-This paper presents an analysis and comparison of magnetics structures in a tapped boost converter for LED applications. The magnetic structure is a coupled inductor which is analyzed in a conventional wire-wound core as well as in a planar structure for different interleaving winding arrangements. The analysis is performed in terms of leakage inductance, winding capacitance and winding loss. Efficiency measurements are performed to verify the effect on the converter performance.

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“…An efficiency optimization technique has been proposed in [32], [33] to improve the energy efficiency of the converter. Investigation of different transformer winding architectures (TWAs) for the same topology has been proposed in [34]. A new digital control technique to achieve the valley switching during both charge and discharge processes in a bidirectional flyback converter is proposed in [35], for better energy efficiency and improved charge and discharge speed.…”

Section: High Voltage Drivers: Conventional and Proposedmentioning

confidence: 99%

Bidirectional flyback converter with multiple series connected outputs for high voltage capacitive charge and discharge applications

Thummala

Schneider

Zhang

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-This paper evaluates two different implementations of a bidirectional flyback converter for driving a capacitive electro active actuator, which must be charged and discharged from 0 V to 2.5 kV DC and vice versa, supplied from a 24 V battery. In one implementation, a high voltage MOSFET (4 kV) in series with a high voltage blocking diode is added, in parallel with a high voltage freewheeling diode of a conventional flyback topology, to enable bidirectional operation. Experimental result from a digitally controlled bidirectional flyback converter shows that the discharge energy efficiency is limited by the parasitics of the high voltage active components, which also prevent full utilization of valley switching during discharge process. A second implementation is therefore proposed, where the secondary of flyback transformer winding is split into multiple windings which are connected in series by lower voltage rating MOSFETs driven by a gate drive transformer. Simulation results to compare the operation of conventional and proposed converters are provided. The advantages of proposed implementation are improved energy efficiency and lower cost. Experimental results with two series connected secondary windings are provided to validate the proposed implementation.Balancing capacitor across a series combination of one of the splitted secondary winding and a secondary MOSFET.

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Investigation of transformer winding architectures for high voltage capacitor charging applications

Cited by 8 publications

References 25 publications

Design of a high voltage bidirectional DC-DC converter for driving capacitive incremental actuators usable in electric vehicles (EVs)

Design of a high voltage bidirectional DC-DC converter for driving capacitive incremental actuators usable in electric vehicles (EVs)

Analysis and comparison of magnetic structures in a tapped boost converter for LED applications

Bidirectional flyback converter with multiple series connected outputs for high voltage capacitive charge and discharge applications

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