Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

Roedgaard, M. S.; Weirich, M.; Andersen, Michael A. E.

doi:10.1109/tpel.2012.2233499

Cited by 31 publications

(16 citation statements)

References 30 publications

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“…Closed loop control strategies allowing ZVS operation of converter have been suggested in [27,28,29]. Self-oscillating controls have been used in PT-based converters [30,31] besides extensively using them in class-D amplifiers [32,33,34] as well as in DC-DC converters [35].…”

Section: Control Methodsmentioning

confidence: 99%

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State-of-the-art piezoelectric transformer-based switch mode power supplies

Ekhtiari

Zhang

Andersen

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Inductorless switch mode power supplies based on piezoelectric transformers are used to replace conventional transformers in high power density switch mode power supplies. Even though piezoelectric-based converters exhibit a high degree of nonlinearity, it is desirable to use piezoelectric transformers due to their smaller size, lighter weight, lower electromagnetic interference, higher power density, higher efficiency, and lower cost. Moreover, PTs allow converters to operate in high switching frequencies and by obtaining soft switching condition, switching losses will decrease. This paper discusses power supplies with the trend evaluation of piezoelectric transformer-based converter topologies and control methods. The challenges of piezoelectric transformers regarding soft switching capability and nonlinearity are addressed. This paper can be used as a guideline for choosing a proper topology of piezoelectric-based switch mode power supply and a control method for the required application.

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Section: Control Methodsmentioning

confidence: 99%

“…Step-down Power application [7] Phase shift Forward conduction mode [28] Burst mode [37] 90% [28] Very high [9,19] No (Inductorless)…”

Section: Class Ementioning

confidence: 99%

State-of-the-art piezoelectric transformer-based switch mode power supplies

Ekhtiari

Zhang

Andersen

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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“…In doing so, the advantages of using PT were lost. However, with careful design, it is possible to remove inductors completely from the converter [19]- [22], [49]- [52]. The same technique can be applied for micro-resonators as well.…”

Section: Mems Resonator Based Power Convertermentioning

confidence: 99%

“…It is not feasible to utilize them in power converters, as it may lead to converters with unreasonable efficiency profile. Interestingly, piezoelectric devices such as piezoelectric transformers (PT) have been used in power conversion applications, such as lamp ballasts [19], [21] and LED drivers [22], [23] for more than a decade [24]. They offer many advantages in terms of size and mass compared to their magnetic counterparts (inductors and transformers).…”

mentioning

confidence: 99%

Contour-Mode Ring-Shaped AlN Microresonator on Si and Feasibility of Its Application in Series-Resonant Converter

Imtiaz

Khan

Walling

2015

IEEE Trans. Power Electron.

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Microelectromechanicalsystems (MEMS) resonators on Si have the potential to replace the discrete passive components in a power converter. The main intention of this paper is to present a ring-shaped aluminum nitride (AlN) piezoelectric micro-resonator that can be used as an energytransferring device to replace inductors/capacitors in low power resonant converters for biomedical applications. Finite element simulation results have been provided, showing the mode of vibration at resonant frequency. The zero voltage switching (ZVS) condition for a series resonant converter incorporating the proposed MEMS resonator has been presented analytically and verified through experiment. This ZVS condition can be found in terms of the equivalent circuit parameters of the resonator. To the knowledge of the authors, ZVS analysis based on the equivalent electrical circuit model of the thin piezoelectric film resonators has not yet been reported in the literature. A CMOS-compatible fabrication process has beenproposed and implemented. In addition, the fabricated devices have been characterized and experimental results are included in the paper. The first contour mode AlN MEMS resonator with moderately low resonant frequency and motional resistance is reported in this paper with measured resonant frequency and motional resistance of 87.28 MHz and 36.728 Ω respectively.

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“…As a consequence, many topologies with high efficiency and high reliability (i.e., long lifespan [6]) have been proposed in order to supply different kind of LED lamps (retrofit, street lighting, commercial or industrial, etc.). Besides, other common requirements imposed to these power supplies are Power Factor (PF) correction [7], [8] and galvanic isolation [9], [10]. Any lighting device connected to the grid has to comply with Energystar or IEC 61000-3-2 Regulations.…”

Section: Introductionmentioning

confidence: 99%

Digital implementation of the feedforward loop of the asymmetrical half-bridge converter for LED lighting applications

Arias

Fernández

Rodriguez

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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Abstract.-The Asymmetrical Half Bridge converter (AHBC) has proven to be a promising candidate for LED lighting applications. It provides high efficiency, galvanic isolation and it can be easily built without electrolytic capacitor. On the other hand, its main drawback is its poor attainable bandwidth. In any two-stage ac-dc LED driver based on the AHBC, the first stage is a Power Factor Corrector (PFC) converter which has to be also implemented without electrolytic capacitor. As a consequence, its output voltage (input voltage of the AHBC) presents a low-frequency ripple. Due to the poor bandwidth of the AHBC, this voltage ripple will be transferred to the converter output voltage, leading to flickering. Due to the complex and non-linear transfer function of the AHBC, any analog feedforward loop has to be tuned for a given operating point, leading to a poor performance when the AHBC moves away from that point. In this paper, a digital feedforward loop is proposed in order to solve this problem. The digital implementation allows the feedforward loop to perfectly cancel the ripple under any condition (e.g., output voltage variation due to dimming). Besides, this digital feedforward loop has been designed and simplified considering the specific purpose of cancelling flickering in the emitted light. In this way, it can be easily implemented in small-size microcontrollers. Experimental results with a 40-W prototype prove the usefulness of the proposed feedforward loop.

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Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

Cited by 31 publications

References 30 publications

State-of-the-art piezoelectric transformer-based switch mode power supplies

State-of-the-art piezoelectric transformer-based switch mode power supplies

Contour-Mode Ring-Shaped AlN Microresonator on Si and Feasibility of Its Application in Series-Resonant Converter

Digital implementation of the feedforward loop of the asymmetrical half-bridge converter for LED lighting applications

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