A Flux Balancer for Phase Shift ZVS DC-DC Converters under Transient Conditions

Claassens, Jonathan; Hofsajer, I.W.

doi:10.1109/apec.2006.1620588

Cited by 20 publications

(9 citation statements)

References 3 publications

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“…Fast modifications in loading conditions can also cause imbalances in the DC flux density component, as described in [8]. However, with modern digital control platforms, this problem can be solved by using the strategy proposed in [11]. The second performed test consists on forcing an external DC flux density component with the external DC source and inductor shown in Fig.…”

Section: Closed Loop Operationmentioning

confidence: 98%

“…Several strategies for ensuring unbiased transformer flux density have been proposed [2,[6][7][8][9][10][11][12] whereby a classification and summary of these strategies is presented in [4]. This paper describes the implementation of a closed loop magnetic flux balancing scheme based on the concept proposed in [4], where a novel non-invasive flux density transducer, the "Magnetic Ear" together with the respective control loop was introduced.…”

Section: Introductionmentioning

confidence: 99%

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Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

Ortiz

Fassler

Kolar

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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The non-ideal behavior of semiconductor devices used in power electronic circuits exciting a transformer can cause DC voltage components applied to the transformer terminals. This DC voltage in turn generates a DC current and/or DC flux density component only limited by the parasitic resistance of the windings and semiconductors. The biased flux density operation deteriorates the performance of the converter, since the core can be driven into saturation, generating higher currents and hence higher temperatures in the circuit. In order to overcome this problem, the previously reported "Magnetic Ear", a non-invasive flux density transducer concept, is used in this paper. The design, placement and all implementation issues for this flux density transducer are described. For verifying the theoretical considerations, the transducer is used to perform a closed loop control over the DC component of the flux density in the 166kW/20kHz transformer, therefore ensuring its unbiased magnetic flux density operation.

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Section: Closed Loop Operationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

Ortiz

Fassler

Kolar

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…battery chargers in electric vehicles for safety reasons [9]. Nevertheless, a transformer isolated converter suffers from issues such as an imbalance of magnetic flux resulting in an increasing DCoffset current I h,DC that drives the transformer into saturation [10]. To prevent damage due to high saturation currents and guarantee system reliability I h,DC must be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Controlling Transformer Magnetizing Offset Current in Isolated Phase-Shift Full-Bridge Converters Using a Luenberger Observer

Neumann

Meynen

Rahmoun³

et al. 2022

International Transactions on Electrical Energy Systems

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This paper proposes a flexible digital control scheme for isolated phase-shift full-bridge (PSFB) converters. The required transformer suffers from inevitable imbalance of magnetic flux resulting in an increased magnetizing DC-offset current that threatens system reliability due to saturation effects. The paper addresses two major issues of the occurrence of a magnetizing DC-offset current. First, caused by the change of duty cycle due to output power regulation and second caused by initial manufacturer tolerances of devices. In contrast to common methods the novel control scheme uses a Luenberger observer to estimate the magnetizing current requiring only simple measurement of transformer voltages without additional and lossy auxiliary networks. The observer model, in combination with a PI-controller, directly interventions the duty cycle and removes any DC-offset current resulting from both issues. A detailed deviation of the state-space model of the transformer and a subsequently design of the observer are presented. Simulation and experimental results on a PSFB prototype verify the principal functionality of the proposed control scheme to prevent transformer saturation.

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“…The multi-polarity converter represented by the bridge converter has bilateral magnetization of the transformer core and high core utilization rate. It is widely used in the design of high-power, high-efficiency high-power-density energy supply systems in aerospace [1]. The consequences of magnetic biasing are very serious.…”

Section: Introductionmentioning

confidence: 99%

Research on Anti-saturation Control Strategy of High-Power and High-Dynamic Servo Power Supply

Wang

Yang

et al. 2021

Lecture Notes in Electrical Engineering

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This paper aims at the multipolar converter topology commonly used in servo power converters, the magnetic bias problem caused by the inconsistent characteristics of the transformer primary coil generating a DC component, propose a research method of anti-saturation control strategy for high-power and high-dynamic servo power supply, effectively suppress the problem that the converter is difficult to apply to high power and high dynamic response due to the accumulation of DC bias. Compensate adjustment based on the symmetrical bridge arm pulse width dead time, achieve fine adjustment of the symmetrical bridge arm conduction duty cycle, meet the positive and negative peak current deviation within the rapid correction cycle,Improve the accumulation of DC bias, effectively solve the problem of transformer flux saturation in high-power and high-dynamic servo power supplies. And build an experimental verification circuit, the experimental results prove the feasibility and effectiveness of the proposed control strategy, significantly improve the reliability of the servo power converter under high dynamic conditions, it has strong engineering application value.

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A Flux Balancer for Phase Shift ZVS DC-DC Converters under Transient Conditions

Cited by 20 publications

References 3 publications

Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

Controlling Transformer Magnetizing Offset Current in Isolated Phase-Shift Full-Bridge Converters Using a Luenberger Observer

Research on Anti-saturation Control Strategy of High-Power and High-Dynamic Servo Power Supply

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