Radiator heightens power density of piezoelectric transformers

Shao, Weiwei; Feng, Zhi Hua; Xu, Jiawen; Pan, Chengliang; Liu, Y.B.

doi:10.1049/el.2010.8141

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…Several studies have been focused on the effective heat dissipation to improve their power density. With an auxiliary heat transfer structure (HTS) designed as a radiator, output power density of a PZT‐4 PT was raised up to 135 W/cm 3 with an efficiency of 90.8% at 90.1 kHz, while the temperature rise was restrained to lower than 10°C [5]. The power density was over two times larger than the one without HTS [6].…”

Section: Introductionmentioning

confidence: 99%

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Polypropylene membrane decreases contact wear of piezoelectric transformer with heat transfer structure

Shao

Pan

et al. 2013

Electron. lett.

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A new design is presented to decrease the contact wear between a piezoelectric transformer and its heat transfer structure by inserting a layer of polypropylene membrane between them. Without significant degradation of performance, the wear problem is well suppressed with notable extension of working life. Compared with the former wear rate of 2.72% per day on the electrodes in the first 2.5 working days, the wear rate with polypropylene membrane is decreased to only 0.03% per day within an accumulated working time of 110 days. Moreover, with the insulating layer, structure design and package become more flexible as the metal electrodes and radiator are isolated.

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Section: Introductionmentioning

confidence: 99%

“…Proposed design: Fig. 1 shows the proposed design of the PP membrane for PT with HTS [5]. PT is a PZT-4 plate (31 × 20 × 0.4 mm 3 ) operated at the contour-extensional vibration mode with a resonant frequency of 89 kHz.…”

mentioning

confidence: 99%

Polypropylene membrane decreases contact wear of piezoelectric transformer with heat transfer structure

Shao

Pan

et al. 2013

Electron. lett.

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“…The matched inductance L 0 can be calculated based on (3) if the values of f s , C 0 and R 1 are known. The resonant frequency f s is 92.18 kHz.…”

Section: Capacitive Compensation Experiments Of Pt With Pzt-ceramic Anmentioning

confidence: 99%

“…The past several decades have witnessed the rapid development of piezoelectric transformers (PTs) because of their distinct advantages, such as high power density [1][2][3], high efficiency, miniaturisation and integration [4], low electromagnetic interference and good electrical isolation [5]. In some specific situations, PTs have become a competitive alternative to conventional electromagnetic transformers, particularly when size, cost and weight are among the critical factors to be considered [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric ceramic acting as inductor for capacitive compensation in piezoelectric transformer

Shao

Zhang

et al. 2015

IET Power Electronics

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It is found that a piezoelectric plate can serve as an excellent inductive component between its resonant and antiresonant frequencies. To compensate for the capacitance of a piezoelectric transformer (PT) at resonance, three piezoelectric plates with different inductances are chosen to match the PT in different exciting power. Experiments demonstrate that a piezoelectric ceramic can mimic an inductor effectively. Compared with the wirewound inductor, the mimic inductor made of piezoelectric ceramic can achieve a better compensation in a large power range to guarantee inductive impedance phase for the PT. With the excellent advantages in terms of compensation, cost and fabrication, ceramic inductor has potential use in PT-based converter of high integration and efficiency without the need for conventional wirewound inductors.

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“…To dissipate the heat efficiently, a ring-dot-shape piezoelectric transformer with a central hole was proposed for better thermal radiation.P [5] P In this ring-dot-shape piezoelectric transformer, it has more uniform temperature distribution, larger output power and better efficiency. On the other hand, Shao et al adopted the contact heat transfer to dissipate the heat in order to heighten the power density of piezoelectric transformers.P [6] claimed that their proposed mechanism gives excellent performance even though the contact interface may produce additional friction heat. In this paper, we start from observing the relationships between the equivalent dissipation resistances and the input voltages at different temperatures to establish a theoretical-phenomenological model.…”

Section: Introductionmentioning

confidence: 99%

Power enhancement of piezoelectric transformers by adding thermal pad

Liu

Vasić³

et al. 2012

SPIE Proceedings

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It is well known that power density of piezoelectric transformers is limited by mechanical stress. The power density of piezoelectric transformers calculated by the stress boundary can reach 330 W/cmP 3 P.However, no piezoelectric transformer has ever reached such a high power density in practice. The power density of the piezoelectric transformer is limited to 33 W/cmP 3 Ptypically.This fact implies that there is another physical limitation in piezoelectric transformer. In fact, it is also known that piezoelectric material is constrained by vibration velocity. Once the vibration velocity is too large, the piezoelectric transformer generates heat until it cracks. To explain the instability of piezoelectric transformer, we will first model the relationship between vibration velocity and resulting heat by a physical feedback loop. It will be shown that the vibration velocity as well as the heat generation determines the loop gain. A large vibration velocity and heat may cause the feedback loop to enter into an unstable state. Therefore, to enhance the power capacity of piezoelectric transformer, the heat needs to be dissipated. In this paper, we used commercial thermal pads on the surface of the piezoelectric transformer to dissipate the heat. The mechanical current of piezoelectric transformers can move from 0.382A/2W to 0.972A/9W at a temperature of 55°C experimentally. It implies that the power capacity possibly increases 3 times in the piezoelectric material. Moreover, piezoelectric transformers that are well suited in applications of high voltage/low current becomes also well suited for low voltage/high current power supplies that are widely spread. This technique not only increases the power capacity of the piezoelectric transformer but also allows it to be used in enlarged practical applications. In this paper, the theoretical modeling will be detailed and verified by experiments.

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Radiator heightens power density of piezoelectric transformers

Cited by 9 publications

References 7 publications

Polypropylene membrane decreases contact wear of piezoelectric transformer with heat transfer structure

Polypropylene membrane decreases contact wear of piezoelectric transformer with heat transfer structure

Piezoelectric ceramic acting as inductor for capacitive compensation in piezoelectric transformer

Power enhancement of piezoelectric transformers by adding thermal pad

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