AUTOMATIC BIASING CIRCUIT FOR DRIVING PIEZOELECTRIC BIMORPH ACTUATORS SAFELY AND EFFICIENTLY
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- 英文论文题名：AUTOMATIC BIASING CIRCUIT FOR DRIVING PIEZOELECTRIC BIMORPH ACTUATORS SAFELY AND EFFICIENTLY
- 论文作者：Jian CHEN ; Yong-bin LIU ; Yang YE ; Qiao-sheng PAN ; Zhi-hua FENG
- 英文论文作者：Jian CHEN ; Yong-bin LIU ; Yang YE ; Qiao-sheng PAN ; Zhi-hua FENG ; Department of Precision Machinery and Precision Instrumentation ; University of Science and Technology of China ; Department of Mechanical Engineering ; Anhui University ; School of Instrument Science and Opto-electronics Engineering ; Hefei University of Technology
- 年：2016
- 作者机构：Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China;Department of Mechanical Engineering, Anhui University;School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology;
- 英文论文关键词：Piezoelectric actuator ; Automatic biasing circuit ; Maximum energy density ; Depolarization
- 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：TN384
- 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：11k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective Piezoelectric actuators have drawn wide attention due to their compact structure, high stiffness, wide frequency response, high displacement resolution and high power density. Broadly speaking, there are mainly two types of piezoelectric actuators, i.e. multilayer(or stack) and bending actuators. Piezoelectric multilayer actuators produce relatively small displacement with large blocking force in the longitudinal direction, while the bending actuators generate much larger displacement with lower blocking force in the transverse direction. Piezoelectric bending actuators can be of various configurations, including unimorph, bimorph, multimorph, piezoelectric tube, etc., among which bimorph is the most common style. Since the invention of piezoelectric bimorph benders, they have been used in a variety of applications, such as reproducers, microphones, ultrasonic motors, micro-robots and cooling fans. In order to drive a piezoelectric bimorph actuator to its maximum extent without depolarizing the piezoelectric elements, usually an AC voltage and two DC bias voltages are needed. This is because the absolute value of the minimum voltage, determined by the coercive field, that can applied on a piezoelectric plate is about one fifth of the maximum applied voltage, determined by the poling field. Typically, direct voltage converters are used to generate the bias voltages, but a direct voltage converter that can generate a high DC voltage is usually heavy and expensive. In some cases, for example the piezoelectric cooling fan, it is not practical to provide every fan with a direct voltage converter during a long working time. In order to drive piezoelectric bimorph actuators to their maximum extent without depolarization in a simple way, this paper proposes an automatic biasing circuit that can generate the bias voltages directly from the driving voltage itself, which can eliminate the need for direct voltage converters. Statement of Contribution/Methods We present a method to drive the piezoelectric bimorph actuators in parallel configuration efficiently without causing depolarization. The basic concept of the method involves utilizing a simple circuit to convert an AC input signal into positive and negative DC voltages, which function as the DC biases when the AC voltage actuates the bimorph. Different from generating the bias voltages via some direct voltage converters, here two bias voltages are obtained directly from the driving voltage itself through a simple circuit, using only resistors, capacitors and diodes. In addition, the values of the bias voltages can be adjusted from 0 to the maximum or minimum values. Results Two schematic diagram of the automatic biasing circuits are introduced and the working principle of the generation of the biasing voltages is analyzed in detail. To validate the performances of the proposed circuits, they are used to drive a bimorph actuator fabricated from PZT4 type ceramics, with the capacitance of 20 n F and the maximum and minimum driving voltage of 400 V and-100 V. Waveforms of the drive voltage and bias voltages, generated by the circuits and applied on the bimorph actuator, are recorded and presented under different frequencies. The test results are in accordance with the theoretical analysis, which proves the effectivity and feasibility of the automatic biasing circuits. Discussion and Conclusions A simple and effective circuit configuration for driving piezoelectric bimorph actuators to the maximum extent without depolarizing them is introduced. The proposed circuit can generate positive and negative bias voltages automatically from an applied AC voltage. Moreover, the amplitudes of the DC bias voltages can be adjusted from 0 to the maximum or minimum values. The method needs only an AC voltage which is used to drive the bimorph and no additional DC converters are needed. The feasibility of the method is experimentally validated and the parameters of the components in the circuit are changeable to satisfy the requirements of specific bimorph actuators.
Background, Motivation and Objective Piezoelectric actuators have drawn wide attention due to their compact structure, high stiffness, wide frequency response, high displacement resolution and high power density. Broadly speaking, there are mainly two types of piezoelectric actuators, i.e. multilayer(or stack) and bending actuators. Piezoelectric multilayer actuators produce relatively small displacement with large blocking force in the longitudinal direction, while the bending actuators generate much larger displacement with lower blocking force in the transverse direction. Piezoelectric bending actuators can be of various configurations, including unimorph, bimorph, multimorph, piezoelectric tube, etc., among which bimorph is the most common style. Since the invention of piezoelectric bimorph benders, they have been used in a variety of applications, such as reproducers, microphones, ultrasonic motors, micro-robots and cooling fans. In order to drive a piezoelectric bimorph actuator to its maximum extent without depolarizing the piezoelectric elements, usually an AC voltage and two DC bias voltages are needed. This is because the absolute value of the minimum voltage, determined by the coercive field, that can applied on a piezoelectric plate is about one fifth of the maximum applied voltage, determined by the poling field. Typically, direct voltage converters are used to generate the bias voltages, but a direct voltage converter that can generate a high DC voltage is usually heavy and expensive. In some cases, for example the piezoelectric cooling fan, it is not practical to provide every fan with a direct voltage converter during a long working time. In order to drive piezoelectric bimorph actuators to their maximum extent without depolarization in a simple way, this paper proposes an automatic biasing circuit that can generate the bias voltages directly from the driving voltage itself, which can eliminate the need for direct voltage converters. Statement of Contribution/Methods We present a method to drive the piezoelectric bimorph actuators in parallel configuration efficiently without causing depolarization. The basic concept of the method involves utilizing a simple circuit to convert an AC input signal into positive and negative DC voltages, which function as the DC biases when the AC voltage actuates the bimorph. Different from generating the bias voltages via some direct voltage converters, here two bias voltages are obtained directly from the driving voltage itself through a simple circuit, using only resistors, capacitors and diodes. In addition, the values of the bias voltages can be adjusted from 0 to the maximum or minimum values. Results Two schematic diagram of the automatic biasing circuits are introduced and the working principle of the generation of the biasing voltages is analyzed in detail. To validate the performances of the proposed circuits, they are used to drive a bimorph actuator fabricated from PZT4 type ceramics, with the capacitance of 20 n F and the maximum and minimum driving voltage of 400 V and-100 V. Waveforms of the drive voltage and bias voltages, generated by the circuits and applied on the bimorph actuator, are recorded and presented under different frequencies. The test results are in accordance with the theoretical analysis, which proves the effectivity and feasibility of the automatic biasing circuits. Discussion and Conclusions A simple and effective circuit configuration for driving piezoelectric bimorph actuators to the maximum extent without depolarizing them is introduced. The proposed circuit can generate positive and negative bias voltages automatically from an applied AC voltage. Moreover, the amplitudes of the DC bias voltages can be adjusted from 0 to the maximum or minimum values. The method needs only an AC voltage which is used to drive the bimorph and no additional DC converters are needed. The feasibility of the method is experimentally validated and the parameters of the components in the circuit are changeable to satisfy the requirements of specific bimorph actuators.
Background, Motivation and Objective Piezoelectric actuators have drawn wide attention due to their compact structure, high stiffness, wide frequency response, high displacement resolution and high power density. Broadly speaking, there are mainly two types of piezoelectric actuators, i.e. multilayer(or stack) and bending actuators. Piezoelectric multilayer actuators produce relatively small displacement with large blocking force in the longitudinal direction, while the bending actuators generate much larger displacement with lower blocking force in the transverse direction. Piezoelectric bending actuators can be of various configurations, including unimorph, bimorph, multimorph, piezoelectric tube, etc., among which bimorph is the most common style. Since the invention of piezoelectric bimorph benders, they have been used in a variety of applications, such as reproducers, microphones, ultrasonic motors, micro-robots and cooling fans. In order to drive a piezoelectric bimorph actuator to its maximum extent without depolarizing the piezoelectric elements, usually an AC voltage and two DC bias voltages are needed. This is because the absolute value of the minimum voltage, determined by the coercive field, that can applied on a piezoelectric plate is about one fifth of the maximum applied voltage, determined by the poling field. Typically, direct voltage converters are used to generate the bias voltages, but a direct voltage converter that can generate a high DC voltage is usually heavy and expensive. In some cases, for example the piezoelectric cooling fan, it is not practical to provide every fan with a direct voltage converter during a long working time. In order to drive piezoelectric bimorph actuators to their maximum extent without depolarization in a simple way, this paper proposes an automatic biasing circuit that can generate the bias voltages directly from the driving voltage itself, which can eliminate the need for direct voltage converters. Statement of Contribution/Methods We present a method to drive the piezoelectric bimorph actuators in parallel configuration efficiently without causing depolarization. The basic concept of the method involves utilizing a simple circuit to convert an AC input signal into positive and negative DC voltages, which function as the DC biases when the AC voltage actuates the bimorph. Different from generating the bias voltages via some direct voltage converters, here two bias voltages are obtained directly from the driving voltage itself through a simple circuit, using only resistors, capacitors and diodes. In addition, the values of the bias voltages can be adjusted from 0 to the maximum or minimum values. Results Two schematic diagram of the automatic biasing circuits are introduced and the working principle of the generation of the biasing voltages is analyzed in detail. To validate the performances of the proposed circuits, they are used to drive a bimorph actuator fabricated from PZT4 type ceramics, with the capacitance of 20 n F and the maximum and minimum driving voltage of 400 V and-100 V. Waveforms of the drive voltage and bias voltages, generated by the circuits and applied on the bimorph actuator, are recorded and presented under different frequencies. The test results are in accordance with the theoretical analysis, which proves the effectivity and feasibility of the automatic biasing circuits. Discussion and Conclusions A simple and effective circuit configuration for driving piezoelectric bimorph actuators to the maximum extent without depolarizing them is introduced. The proposed circuit can generate positive and negative bias voltages automatically from an applied AC voltage. Moreover, the amplitudes of the DC bias voltages can be adjusted from 0 to the maximum or minimum values. The method needs only an AC voltage which is used to drive the bimorph and no additional DC converters are needed. The feasibility of the method is experimentally validated and the parameters of the components in the circuit are changeable to satisfy the requirements of specific bimorph actuators.
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