A new full-protected control mode to drive piezoelectric transformers in DC-DC converters

Martin, J.A.; Prieto, M.J.; Nuño, F.; Díaz, Juan José del Coz

doi:10.1109/pesc.2001.954049

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The PT design was based on a ring-shaped element operating in thickness vibrational mode, where the primary and secondary sections are separated by an isolation layer [90][91][92][93][94][95][96][97][98][99][100].…”

Section: Beyond the 2000s: Power Piezoelectric Transformersmentioning

confidence: 99%

Piezoelectric Transformers: An Historical Review

Carazo¹

2016

Actuators

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Piezoelectric transformers (PTs) are solid-state devices that transform electrical energy into electrical energy by means of a mechanical vibration. These devices are manufactured using piezoelectric materials that are driven at resonance. With appropriate design and circuitry, it is possible to step up and step down the voltages between the input and output sections of the piezoelectric transformer, without making use of magnetic materials and obtaining excellent conversion efficiencies. The initial concept of a piezoelectric ceramic transformer was proposed by Charles A. Rosen in 1954. Since then, the evolution of piezoelectric transformers through history has been linked to the relevant work of some excellent researchers as well as to the evolution in materials, manufacturing processes, and driving circuit techniques. This paper summarizes the historical evolution of the technology.Keywords: piezoelectric transformer; piezoelectric-based power supply; non-magnetic transformers Historical Introduction 1920s-1930s: Early Studies on Piezoelectric Transformers Using Salt Rochelle Single CrystalThe first studies on electrical to electrical conversion using piezoelectric materials took place in the late 1920s and early 1930s. Alexander McLean Nicolson has the honor of being the first researcher to investigate the idea of a piezoelectric transformer. Nicolson considered two single crystal blocks preloaded against each other with an external frame (Figure 1). Abstract: Piezoelectric transformers (PTs) are solid-state devices that transform electrical energy into electrical energy by means of a mechanical vibration. These devices are manufactured using piezoelectric materials that are driven at resonance. With appropriate design and circuitry, it is possible to step up and step down the voltages between the input and output sections of the piezoelectric transformer, without making use of magnetic materials and obtaining excellent conversion efficiencies. The initial concept of a piezoelectric ceramic transformer was proposed by Charles A. Rosen in 1954. Since then, the evolution of piezoelectric transformers through history has been linked to the relevant work of some excellent researchers as well as to the evolution in materials, manufacturing processes, and driving circuit techniques. This paper summarizes the historical evolution of the technology.

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Section: Beyond the 2000s: Power Piezoelectric Transformersmentioning

confidence: 99%

Piezoelectric Transformers: An Historical Review

Carazo¹

2016

Actuators

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“…As it can be seen, it constitutes a band-pass filter. The topologies that can cope with the aforementioned equivalent circuit are mainly based on class-D converters [5], [6], [7]. Although the topology includes a serial inductor with the PT, its inclusion can be avoided if the PT is properly designed [8]; it must be noted, though, that this inductor can help to reduce harmonics and to obtain auxiliary power supply.…”

Section: Dc/dc Converter Based On Ptmentioning

confidence: 99%

Paralleling DC/DC Switched Converters Based on Piezoelectric Transformers

Díaz

Nuño

Gacio

et al. 2009

2009 IEEE Industry Applications Society Annual Meeting

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One of the most important advantages in using piezoelectric transformers (PT) is that they operate at high frequencies with a very good efficiency [1], tipically higher than 95%. This paper presents a DC/DC converter based on two piezoelectric transformers which duplicates the output voltage frequency ripple, maintaining the switching frequency. Also, the converter operates at a fixed frequency, and an alternative way to regulate the output power is shown. The converter is achieved by parallelizing two DC/DC converters, based on piezoelectric transformers. Of course, the size is increased, but on the other hand, the efficiency and the output ripple are improved. The obtained results evince an improvement in the overall efficiency, as well as a reduction in the output filter size, with a lower voltage ripple.

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“…As it can be seen, it constitutes a bandpass filter. The topologies that can cope with the aforementioned equivalent circuit are mainly based on class-D converters [8], [14], [15]. The goal is to obtain a voltage square waveform of the adequate frequency at the input of the PT plus matching network.…”

Section: Introductionmentioning

confidence: 99%

Closing a Second Feedback Loop in a DC–DC Converter Based on a Piezoelectric Transformer

Díaz

Nuño

Prieto

et al. 2007

IEEE Trans. Power Electron.

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Nowadays, piezoelectric transformers (PT) are a good alternative to substitute magnetic materials in ac/dc and dc-dc converters. They have high isolation voltage and operate at higher frequencies than magnetics, with lower losses. However, their optimum operating frequency exhibits a strong dependence on different parameters, such as temperature, load, or even voltage level applied. This is usually an inconvenience, because this drift affects PT gain and efficiency, which can vary enormously within a few hundred of hertz. On the other hand, not only is it necessary to ensure the PT is driven at the proper frequency-in terms of gain and efficiency, including zero voltage switching in the power stage-output voltage must also be regulated. In this paper, two simple feedback loops are implemented in a PT-based dc-dc converter. One of them adjusts the switching frequency to obtain the best gain and efficiency. The other one performs the output voltage regulation.

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A new full-protected control mode to drive piezoelectric transformers in DC-DC converters

Cited by 6 publications

References 11 publications

Piezoelectric Transformers: An Historical Review

Piezoelectric Transformers: An Historical Review

Paralleling DC/DC Switched Converters Based on Piezoelectric Transformers

Closing a Second Feedback Loop in a DC–DC Converter Based on a Piezoelectric Transformer

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