A STUDY ON THE EQUIVALENT CIRCUIT OF LONGITUDINAL VIBRATION PIEZOELECTRIC TRANSFORMERS WITH CONTACTED HEAT TRANSFER DEVICE

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• 英文论文题名：A STUDY ON THE EQUIVALENT CIRCUIT OF LONGITUDINAL VIBRATION PIEZOELECTRIC TRANSFORMERS WITH CONTACTED HEAT TRANSFER DEVICE
• 论文作者：Pei-yang LI ; Zhi-le HAN ; Wei-wei SHAO ; Jie XU ; Tian-ming GU ; Zhang-jian LI
• 英文论文作者：Pei-yang LI ; Zhi-le HAN ; Wei-wei SHAO ; Jie XU ; Tian-ming GU ; Zhang-jian LI ; Department of Medical Ultrasound ; Suzhou Institute of Biomedical Engineering and Technology ; Chinese Academy of Sciences
• 年：2016
• 作者机构：Department of Medical Ultrasound, Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences;
• 英文论文关键词：Piezoelectric transformer ; Heat transfer device ; Equivalent circuit
• 会议召开时间：2016-10-21
• 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
• 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
• 语种：英文
• 分类号：TM41
• 学会代码：AGLU
• 会议名称：2016年全国压电和声波理论及器件应用研讨会
• 会议地点：中国陕西西安
• 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
• 学会名称：中国力学学会
• 页数：2
• 文件大小：120k
• 原文格式：D
• 会议级别：全国

摘要

Background, Motivation and Objective Piezoelectric transformers(PTs) are devices which can realize mutual transformation between electrical energy and mechanical energy by converse piezoelectric effect and direct piezoelectric effect. Compared with electromagnetic transformers, piezoelectric transformers have many advantages such as compact volume, electromagnetic noise free-operation, non-flammability, and high power to volume ratio. Because of the characters of the piezoelectric material, PT has a high power density 400W/cm~3, and a very small coefficient of thermal conductivity 2W/(m·K), the piezoelectric transformer is hard to be used in high power applications. Dr Shao of University of Science and Technology of China proposed a heat transfer system(HTS) which makes the PT work in high power application. In this paper, the electrical equivalent circuits of the piezoelectric transformer with heat transfer system(PTWHTS) have been studied. We analyze the vibration and heat transfer model of the longitudinal vibration PT. Then, we proposed the experiment study about equivalent circuit model of the PTWHTS, which provide a reference for the piezoelectric transformer in the application of high-power applications. Statement of Contribution/Methods The equivalent circuit model of the longitudinal vibration mode piezoelectric transformer is derived according to the piezoelectric equation, wave equation and electromechanical equivalent network. The equivalent circuit model had been verified by experiments. We also designed a heat dissipation structure for the longitudinal vibration piezoelectric transformers. Base on the equivalent circuit model and heat dissipation structure, the equivalent circuit parameters of the longitudinal vibration mode piezoelectric transformer are studied with contacted heat transfer device(EPTWHT). The dimensions of the whole piezoelectric transformer are 29.5×3×0.4 mm~3. The input part and the output part have the same dimension of 14.5×3×0.4 mm~3. The transformer is poled along the thickness direction. The electrodes of the input and output parts are separated by a narrow insulating gap(0.5mm). The heat transfer device is consist of heat exchanger module, secure block and prestress module. Results According to the linear piezoelectric equation, the parameters of the equivalent circuit were affected greatly by the thickness dimension of the longitudinal vibration mode piezoelectric transformer. The experimental was setup for measuring the practical parameters of the equivalent circuit of piezoelectric transformer with contacted heat transfer device, while the output part was short circuit. R, L, C and C0 are the equivalent resistance, inductance, capacitance and clamped capacitance, respectively. For a full-wave longitudinal mode, the parameters, R, L, C and C0 of the EPTWHT are 138.98Ω,51.25 m H,36.89 p F and 668.33 p F, respectively, at Q_m=246.25. Without heat transfer device, The PT's theoretical calculating value of R, L, C and C0 are 119.72Ω,41.08 m H,47.26 p F and 778.73 p F, respectively, at Q_m =246.25. When the theoretical value is calculated, we suppose the HTS' impact on the parameters of PT is equal to the PT's thickness dimension with 0.1mm. Then, we calculate the theoretical value of PT, whose dimensions are 29.5×3×0.5 mm~3, the value of R, L, C and C0 are 142.41Ω,51.34 m H,37.81 p F and 622.98 p F, respectively, at Qm =246.25. The repeated experiments show that the parameters R, L, C and C0 of the EPTWHT have a high consistency with the theoretical value of the PT with a 0.1mm increase on the thickness dimension. We suppose that the experiment results are closely related with the air space between the piezoelectric transformer and heat transfer device. The follow-up experiments will gradually reveal their relationship. Discussion and Conclusions In this paper, the equivalent circuit of the longitudinal vibration mode piezoelectric transformer was derived and studied with a heat dissipation structure for the longitudinal vibration piezoelectric transformers. Then we measured the parameters of the longitudinal vibration mode piezoelectric transformer with contacted heat transfer device. The experiment results show that the parameters f, R, L, C and C0 of the EPTWHT have a high consistency with the theoretical value of the PT with a 0.1mm increase on the thickness dimension.
Background, Motivation and Objective Piezoelectric transformers(PTs) are devices which can realize mutual transformation between electrical energy and mechanical energy by converse piezoelectric effect and direct piezoelectric effect. Compared with electromagnetic transformers, piezoelectric transformers have many advantages such as compact volume, electromagnetic noise free-operation, non-flammability, and high power to volume ratio. Because of the characters of the piezoelectric material, PT has a high power density 400W/cm~3, and a very small coefficient of thermal conductivity 2W/(m·K), the piezoelectric transformer is hard to be used in high power applications. Dr Shao of University of Science and Technology of China proposed a heat transfer system(HTS) which makes the PT work in high power application. In this paper, the electrical equivalent circuits of the piezoelectric transformer with heat transfer system(PTWHTS) have been studied. We analyze the vibration and heat transfer model of the longitudinal vibration PT. Then, we proposed the experiment study about equivalent circuit model of the PTWHTS, which provide a reference for the piezoelectric transformer in the application of high-power applications. Statement of Contribution/Methods The equivalent circuit model of the longitudinal vibration mode piezoelectric transformer is derived according to the piezoelectric equation, wave equation and electromechanical equivalent network. The equivalent circuit model had been verified by experiments. We also designed a heat dissipation structure for the longitudinal vibration piezoelectric transformers. Base on the equivalent circuit model and heat dissipation structure, the equivalent circuit parameters of the longitudinal vibration mode piezoelectric transformer are studied with contacted heat transfer device(EPTWHT). The dimensions of the whole piezoelectric transformer are 29.5×3×0.4 mm~3. The input part and the output part have the same dimension of 14.5×3×0.4 mm~3. The transformer is poled along the thickness direction. The electrodes of the input and output parts are separated by a narrow insulating gap(0.5mm). The heat transfer device is consist of heat exchanger module, secure block and prestress module. Results According to the linear piezoelectric equation, the parameters of the equivalent circuit were affected greatly by the thickness dimension of the longitudinal vibration mode piezoelectric transformer. The experimental was setup for measuring the practical parameters of the equivalent circuit of piezoelectric transformer with contacted heat transfer device, while the output part was short circuit. R, L, C and C0 are the equivalent resistance, inductance, capacitance and clamped capacitance, respectively. For a full-wave longitudinal mode, the parameters, R, L, C and C0 of the EPTWHT are 138.98Ω,51.25 m H,36.89 p F and 668.33 p F, respectively, at Q_m=246.25. Without heat transfer device, The PT's theoretical calculating value of R, L, C and C0 are 119.72Ω,41.08 m H,47.26 p F and 778.73 p F, respectively, at Q_m =246.25. When the theoretical value is calculated, we suppose the HTS' impact on the parameters of PT is equal to the PT's thickness dimension with 0.1mm. Then, we calculate the theoretical value of PT, whose dimensions are 29.5×3×0.5 mm~3, the value of R, L, C and C0 are 142.41Ω,51.34 m H,37.81 p F and 622.98 p F, respectively, at Qm =246.25. The repeated experiments show that the parameters R, L, C and C0 of the EPTWHT have a high consistency with the theoretical value of the PT with a 0.1mm increase on the thickness dimension. We suppose that the experiment results are closely related with the air space between the piezoelectric transformer and heat transfer device. The follow-up experiments will gradually reveal their relationship. Discussion and Conclusions In this paper, the equivalent circuit of the longitudinal vibration mode piezoelectric transformer was derived and studied with a heat dissipation structure for the longitudinal vibration piezoelectric transformers. Then we measured the parameters of the longitudinal vibration mode piezoelectric transformer with contacted heat transfer device. The experiment results show that the parameters f, R, L, C and C0 of the EPTWHT have a high consistency with the theoretical value of the PT with a 0.1mm increase on the thickness dimension.

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