阅读说明：本技术 一种磁钟摆式电磁-压电复合能量收集器 (Magnetic pendulum type electromagnetic-piezoelectric composite energy collector ) 是由 薛小斌 薛晨阳 郑永秋 翟聪 和珊珊 李瑜 王茹 杨婷婷 吴彬 郝聪聪 段树文 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种基于磁钟摆式的电磁-压电复合能量收集器。主要包括外部壳体,壳体内部的磁铁,放在壳体底部前后侧的线圈,位于壳体左右内侧的双晶压电片,后端采集存储控制模块。位于壳体内部的磁铁接收机械振动,外部的激励会引起封闭壳内磁铁的摆动,从而对壳体内侧的双晶压电片产生压力,进而将机械能转化为电能。该复合能量收集器使用磁钟摆式结构,以机械振动致磁铁摆动引起电磁效应和压电效应为检测原理,其能量收集频带宽、灵敏度高、输出功率大,适合于无源便携智能电子设备等领域。解决了传统的复合能量收集器长时间工作机械性能差,灵敏度低,频率范围窄,体积大的问题。(The invention discloses an electromagnetic-piezoelectric composite energy collector based on a magnetic pendulum type. The double-crystal piezoelectric transformer mainly comprises an external shell, magnets inside the shell, coils placed on the front side and the rear side of the bottom of the shell, double-crystal piezoelectric plates located on the left side and the right side of the shell, and a rear-end acquisition and storage control module. The magnet positioned in the shell receives mechanical vibration, and external excitation can cause the magnet in the closed shell to swing, so that pressure is generated on the double-crystal piezoelectric plate on the inner side of the shell, and mechanical energy is converted into electric energy. The composite energy collector uses a magnetic pendulum type structure, takes the electromagnetic effect and the piezoelectric effect caused by the swinging of the mechanical vibration induced magnet as the detection principle, has wide energy collection frequency band, high sensitivity and large output power, and is suitable for the fields of passive portable intelligent electronic equipment and the like. The problems of poor mechanical performance, low sensitivity, narrow frequency range and large volume of the traditional composite energy collector in long-time working are solved.)

1. A magnetic pendulum type electromagnetic-piezoelectric composite energy collector is characterized in that: the fan-shaped magnetic core comprises a fan-shaped annular shell (1), wherein a center cavity (4) is arranged at the inner ring of the fan-shaped annular shell (1), and a circle center magnet (5) is arranged in the center cavity (4) in a clearance fit manner; a circular magnet I (6 a) and a circular magnet II (6 b) are sequentially placed in the fan-shaped annular shell (1), the circular magnet I (6 a) and the circular magnet II (6 b) are tangent, the circular magnet I (6 a) is tangent to the outer surface of the circular center cavity (4), and the circular magnet II (6 b) is tangent to the outer annular surface of the fan-shaped annular shell (1); the bottom parts of the front and rear fan surfaces of the fan-shaped shell (1) are symmetrically provided with protruding coil placing cavities (2), and copper coils (3) are placed in the coil placing cavities (2); the double-crystal piezoelectric plates (8) are symmetrically arranged in two side faces of the fan-shaped shell (1); the copper coil (3) and the bimorph piezoelectric plate (8) are sequentially connected with an ultra-low power consumption acquisition module (9), a boosting module (10), a voltage stabilizing module (11) and a storage module (12) through leads respectively.

2. The magnetic pendulum type electromagnetic-piezoelectric composite energy collector of claim 1, wherein: the diameters of the circle center magnet (5), the circular magnet I (6 a) and the circular magnet II (6 b) are sequentially increased by 5 mm.

3. The magnetic pendulum type electromagnetic-piezoelectric composite energy collector of claim 2, wherein: the diameter of the coil placing cavity (2) is the same as that of the circular magnet II (6 b), and the coil placing cavity (2) is tangent to the lowest point of the outer annular surface of the fan-shaped annular shell (1).

4. The magnetic pendulum type electromagnetic-piezoelectric composite energy collector of claim 1, wherein: the bimorph piezoelectric plate (8) is positioned on the base angle boss (7).

5. The magnetic pendulum type electromagnetic-piezoelectric composite energy collector of claim 1, wherein: the ultra-low power consumption acquisition module (9), the boosting module (10), the voltage stabilizing module (11) and the storage module (12) are positioned outside the fan-shaped annular shell (1).

Technical Field

The invention relates to the technical field of composite energy collectors, in particular to an electromagnetic-piezoelectric composite energy collector based on a magnetic pendulum type, which is used as a broadband and high-sensitivity composite energy collector.

Background

Mechanical energy exists in people's daily life, such as: human motion, mechanical vibration, etc. Heretofore, vibration energy harvesters have typically been based on four different physical principles of transduction techniques, namely piezoelectric effect, electromagnetic induction, magnetostriction, and triboelectric electrostatic induction coupling.

In recent years, the use trend of wearable and portable electronic devices is more and more obvious, but the growing trend is still limited by the single power supply mode and short life cycle of batteries, which leads to the increasing demand of chemical battery substitutes. Therefore, various energy collection technologies for different energy sources have been proposed and designed to provide continuous power, such as kinetic energy, solar energy, thermal energy, and sound energy, to the low-power portable electronic devices. Energy harvesters based on ambient vibrations are capable of converting mechanical vibrations into electrical energy, and these techniques have broad application prospects in low-power electronic devices.

However, these energy harvesters using different principles have inevitable disadvantages in practical applications: 1. the mechanical property of the cantilever beam structure is poor, and mechanical fatigue and even device damage are easy to generate after the cantilever beam structure works for a little high strength or a long time; 2. the friction generator has large internal resistance and low output power in a limited area, and the converted mechanical energy is not enough to support the power consumption requirement of subsequent electronic equipment; 3. the sensitivity is low, the frequency range is narrow, and the output effect under low-frequency input is poor; 4. the structure is complicated, the device volume is large, and the portability is poor.

Disclosure of Invention

The invention aims to solve the problems of narrow frequency band, low sensitivity, low output power and large device volume of the existing composite energy collector and provides a magnetic pendulum type electromagnetic-piezoelectric composite energy collector with wide frequency band and high sensitivity.

The invention is realized by adopting the following technical scheme:

a magnetic pendulum type electromagnetic-piezoelectric composite energy collector comprises a fan-shaped shell, wherein a circle center cavity is arranged at the inner ring of the fan-shaped shell, and a circle center magnet is arranged in the circle center cavity in a clearance fit manner; a circular magnet I and a circular magnet II are sequentially arranged in the fan-shaped annular shell, the circular magnet I and the circular magnet II are tangent, the circular magnet I is tangent to the outer surface of the circle center cavity, and the circular magnet II is tangent to the outer annular surface of the fan-shaped annular shell; the bottom parts of the front and rear fan surfaces of the fan-shaped shell are symmetrically provided with protruding coil placing cavities, and copper coils are placed in the coil placing cavities; the double-crystal piezoelectric plates are symmetrically arranged in two side faces of the fan-shaped shell; the copper coil and the bimorph are respectively connected with an ultra-low power consumption acquisition module, a boosting module, a voltage stabilizing module and a storage module in sequence through leads.

When the device works, the composite energy collector is fixed on a vibration source, the round magnet of the sensitive unit starts to swing to realize magnetoelectric conversion, and the swing touches the double-crystal piezoelectric plates on the left side and the right side to realize piezoelectric conversion; the lead wire is connected with the storage module through the ultra-low power consumption acquisition module, the boosting module, the voltage stabilizing module and the storage module, so that electric energy is provided for the portable intelligent electronic equipment.

The broadband and high-sensitivity composite energy collector has the advantages that:

1) the collector is small in size, a symmetrical structure is integrally adopted, four power generation units are integrated, electromagnetic induction and piezoelectric effect are mutually compensated, limited space is fully utilized, and unit output power is improved.

2) The magnets of the core components are connected only by the mutual attraction acting force of the opposite magnetic poles, the surfaces of the magnets are highly polished, the magnets are packaged in a closed space, and the sliding friction force and the air resistance are ignored. The diameters of the three magnets are increased by 5mm from top to bottom in sequence, vibration signals are physically amplified, and the sensitivity and the collectable frequency range of the device are improved.

3) The ultralow power consumption acquisition module reduces the power consumption to the greatest extent, and the boosting and voltage-stabilizing storage module can directly supply power to the low-power consumption electronic equipment, so that the practical value of the device is improved.

The invention has reasonable design and good practical application value.

Drawings

Fig. 1 shows a schematic view of the overall structure of the present invention.

Fig. 2 shows a right side view of the overall package of the present invention.

Fig. 3 shows a block diagram of a magnetically susceptible unit.

Fig. 4 shows a schematic diagram of a circuit module.

In the figure: the device comprises a fan-shaped annular shell, a coil placing cavity, a copper coil, a 4-center cavity, a 5-center magnet, a circular magnet I, a circular magnet II, a bottom angle boss, a double-crystal piezoelectric plate, a 9-ultra-low power consumption acquisition module, a 10-boosting module, a 11-voltage stabilizing module and a 12-storage module.

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

A magnetic pendulum type electromagnetic-piezoelectric composite energy collector mainly comprises an external shell, magnets inside the shell, coils placed at the bottom of the front side and the rear side of the shell, double-crystal piezoelectric plates located on the left inner side and the right inner side of the shell, and a rear-end acquisition, storage and control module. The magnet located inside the shell receives mechanical vibration, and external excitation can cause the swing of the magnet in the closed shell, so that pressure is generated on the double-crystal piezoelectric plate on the inner side of the shell, mechanical energy is converted into electric energy, and meanwhile, the electric energy is collected through magnetoelectric conversion.

As shown in fig. 1, the fan-shaped casing comprises a fan-shaped casing 1, a circle center cavity 4 is arranged at an inner ring of the fan-shaped casing 1 (namely, the center of the circle center cavity coincides with the circle center corresponding to the fan-shaped casing), and a circle center magnet 5 is arranged in the circle center cavity 4 in a clearance fit manner.

As shown in figure 3, a circular magnet I6 a and a circular magnet II 6b are sequentially placed in the fan-shaped annular shell 1, the circular magnet I6 a and the circular magnet II 6b are tangent, the circular magnet I6 a is tangent to the outer surface of the circle center cavity 4, and the circular magnet II 6b is tangent to the outer annular surface of the fan-shaped annular shell 1. The circular magnet I6 a and the circular magnet II 6b are connected only by the principle that opposite magnetic poles attract each other and are in a suspended state. The magnetic sensitive unit consists of a circle center magnet 5, two circular magnets I6 a and two circular magnets II 6b, the diameters of the circle center magnet 5, the circular magnets I6 a and the circular magnets II 6b are sequentially increased by 5mm, vibration signals are physically amplified, and the sensitivity of devices and the frequency range capable of being acquired are improved.

As shown in fig. 2, the front and back fan-shaped bottom of the fan-shaped annular housing 1 are symmetrically provided with protruding coil placing cavities 2, and circular copper coils 3 are placed in the coil placing cavities 2. The diameter of the coil placing cavity 2 is the same as that of the circular magnet II 6b, and the coil placing cavity 2 is tangent to the lowest point of the outer annular surface of the fan-shaped annular shell 1.

As shown in fig. 1, bimorph piezoelectric patches 8 are symmetrically arranged in two side surfaces of the fan-shaped casing 1, and the bimorph piezoelectric patches 8 are positioned on the base angle bosses 7 at two sides in the fan-shaped casing 1, so that the maximum deformation of the bimorph piezoelectric patches 8 is realized.

As shown in fig. 4, the copper coil 3 and the bimorph piezoelectric patch 8 are respectively connected with the ultra-low power consumption acquisition module 9, the boosting module 10, the voltage stabilizing module 11 and the storage module 12 in sequence through wires, and the ultra-low power consumption acquisition module 9, the boosting module 10, the voltage stabilizing module 11 and the storage module 12 can be integrated and located outside the fan-shaped casing 1. The vibration excitation is realized by electromagnetic induction and piezoelectric effect, passes through the ultra-low power consumption acquisition module 9, the boosting module 10, the voltage stabilizing module 11 and the final connection storage module 12, and provides electric energy for the portable intelligent electronic equipment.

When external excitation is performed, the two circular magnets I6 a and the circular magnets II 6b of the sensing unit start to swing to realize magnetoelectric conversion, the swing touches the double-crystal piezoelectric plates 8 on the left side and the right side to realize piezoelectric conversion, the circular magnets I6 a and the circular magnets II 6b of the sensing unit move according to the size of a vibration signal, and when the excitation is large, the double-crystal piezoelectric plates 8 convert redundant mechanical energy to realize a compensation effect. The lead wire passes through the ultra-low power consumption acquisition module 9, the boosting module 10, the voltage stabilizing module 11 and finally is connected with the storage module 12, so that electric energy is provided for the portable intelligent electronic equipment.

The composite energy collector is integrally of a symmetrical structure, and a magnetic pendulum type structure is used as a sensitive structure, so that the problems of poor mechanical performance, low sensitivity, narrow frequency range and large volume of the traditional composite energy collector in long-time working are solved.

The composite energy collector uses a magnetic pendulum type structure, takes the electromagnetic effect and the piezoelectric effect caused by the swinging of the mechanical vibration induced magnet as the detection principle, has wide energy collection frequency band, high sensitivity and large output power, and is suitable for the fields of passive portable intelligent electronic equipment and the like.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the above examples are not intended to limit the invention in any way and that any arrangement which is calculated to achieve the above objectives, such as variations, modifications, equivalents, or equivalent arrangements, will fall within the scope of the invention.