阅读说明：本技术 一种基于电磁的自供电电子显示屏及振动能量收集器 (Self-powered electronic display screen based on electromagnetism and vibration energy collector ) 是由 朱磊 张媛 屠迪龙 于 2021-07-02 设计创作，主要内容包括：本申请提供一种基于电磁的自供电电子显示屏及振动能量收集器。本申请利用振动能量收集器,感应于低频振动部件的振动而通过悬浮磁体的上下震颤产生电磁场的变化,从而通过线圈感应于磁场强度的相应变化,激励产生感应电流并输出感应电动势。由此,本申请可通过能量转化电路,实现物流运输的2-15Hz振动频率下的能量的可观输出,从而直接为低功耗显示屏供电,实现对显示信息的低成本循环更新和展示。(The application provides a self-powered electronic display screen and vibration energy collector based on electromagnetism. This application utilizes vibration energy collector, responds to in the vibration of low frequency vibration part and through the change of suspension magnet's upper and lower tremble production electromagnetic field to respond to in the corresponding change of magnetic field intensity through the coil, the excitation produces induced current and output induction electromotive force. Therefore, the considerable output of the energy under the 2-15Hz vibration frequency of the logistics transportation can be realized through the energy conversion circuit, so that the power is directly supplied to the low-power-consumption display screen, and the low-cost cyclic updating and displaying of the display information are realized.)

1. An electromagnetically-based self-powered electronic display screen, comprising:

the vibration energy collector is arranged on the low-frequency vibration component and is provided with a suspension magnet (4) suspended in the vibration energy collector and a coil (5) surrounding the suspension magnet (4), the central axis direction of the coil (5) corresponds to the vibration direction of the low-frequency vibration component, the suspension magnet (4) synchronously reciprocates across the coil (5) along the central axis direction of the coil or vibrates in the coil in a reciprocating mode along the central axis direction of the coil along the vibration direction of the low-frequency vibration component, and the coil is excited to generate induced current and output induced electromotive force correspondingly when the intensity of magnetic field changes;

the input end of the energy conversion circuit is connected with the coil (5) of the vibration energy collector, the induced electromotive force generated by the vibration energy collector is received, the capacitor in the energy conversion circuit is repeatedly charged by utilizing the induced electromotive force, and stable power supply voltage is output through capacitor discharge;

the microprocessor receives the power supply of the energy conversion circuit and outputs a display control signal;

and the low-power-consumption display screen receives the power supply of the energy conversion circuit, is connected with the output end of the display control signal of the microprocessor, and responds to the display control signal output by the microprocessor to display a corresponding interface.

2. The electromagnetically self-powered electronic display screen of claim 1 wherein said vibration energy harvester comprises:

a container (9) which is a hollow sleeve made of insulating material and is fixed on the low-frequency vibration component in parallel with the vibration direction;

the coil (5) is uniformly wound in the middle of the outer wall of the container (9);

the suspension driving units are respectively arranged at the upper end and the lower end of the container (9), and the two suspension driving units are respectively arranged to have the same magnetic field direction;

the suspension magnet (4) is arranged inside the container (9), is positioned between the two suspension driving units and is mutually exclusive with the magnetic field directions of the two suspension driving units;

the suspension magnet (4) is kept suspended in the middle of the container (9) by magnetic field repulsive force of the upper suspension driving unit and the lower suspension driving unit, and synchronously reciprocates up and down along the inner wall of the container (9) along the coil (5) or vibrates in the coil in a reciprocating manner along the vibration of the low-frequency vibration component.

3. The electromagnetically-based self-powered electronic display screen of claim 2, wherein the hover drive unit comprises:

a top end fixed magnet (1) arranged at the top end of the container (9);

the top end elastic piece (2) is arranged in the container (9), the top of the top end elastic piece (2) is fixedly connected with the top end fixing magnet (1), and the bottom of the top end elastic piece (2) extends towards the middle of the container (9);

a top end gasket (3) fixedly connected to the bottom of the top end elastic piece (2);

a bottom-end fixed magnet (8) provided at the bottom end of the container (9);

the bottom end elastic part (7) is arranged in the container (9), the bottom of the bottom end elastic part (7) is fixedly connected with the bottom end fixing magnet (8), and the top of the bottom end elastic part (7) extends towards the middle of the container (9);

the bottom gasket (6) is fixedly connected to the top of the bottom elastic piece (7);

when the suspension magnet (4) upwards touches the bottom of the top gasket (3), the top elastic piece (2) contracts and pushes the suspension magnet (4) downwards to return to the middle coil position of the container (9);

when the suspension magnet (4) touches the top of the bottom gasket (6) downwards, the bottom elastic piece (7) contracts and pushes the suspension magnet (4) upwards to return to the middle coil position of the container (9).

4. The electromagnetically-based self-powered electronic display screen of claim 1, wherein the energy conversion circuitry comprises a plurality of charge-discharge units sequentially cascaded between the ends of the coil, wherein each charge-discharge unit comprises:

the anode of the first charging capacitor is simultaneously connected with the cathode of the first diode in the charge-discharge unit of the current stage and the anode of the second diode, and the cathode of the first charging capacitor is connected with the anode of the second diode in the charge-discharge unit of the first stage or directly connected with the first end of the coil (5) when the first charging capacitor is used as the charge-discharge unit of the first stage;

the anode of the first diode is connected with the cathode of a second diode in the primary charging and discharging unit or is directly connected with the second end of the coil (5) when being used as the primary charging and discharging unit and is also used as one output end of the power supply voltage;

the cathode of the second charging capacitor is connected with the anode of the first diode, and the anode of the second charging capacitor is connected with the cathode of the second diode;

and when the second diode is used as the last-stage charge-discharge unit, the negative electrode of the second diode is directly used as the output end to output the power supply voltage.

5. The electromagnetically-based self-powered electronic display screen of claim 4, wherein said low power consumption display screen is an electronic ink screen.

6. A vibration energy harvester disposed on a vibrating member, comprising:

the suspension magnet (4) is suspended in the suspension magnet, the coil (5) is surrounded outside the suspension magnet (4), the central axis direction of the coil (5) is correspondingly consistent with the vibration direction of the low-frequency vibration component, the suspension magnet (4) synchronously reciprocates across the coil (5) along the central axis direction of the coil or vibrates in the coil along with the vibration of the low-frequency vibration component, and the coil is correspondingly excited to generate induced current and output induced electromotive force due to the change of the magnetic field intensity.

7. A vibration energy harvester according to claim 6 wherein the vibration energy harvester is fixedly arranged on the logistics transport unit and supplies power to the low power consumption display screen in the logistics transport unit.

8. A vibration energy harvester according to claim 7 wherein the vibration energy harvester comprises:

a container (9) which is a hollow sleeve made of insulating material and is fixed on the low-frequency vibration component in parallel with the vibration direction;

the coil (5) is uniformly wound in the middle of the outer wall of the container (9);

the suspension driving units are respectively arranged at the upper end and the lower end of the container (9), and the two suspension driving units are respectively arranged to have the same magnetic field direction;

the suspension magnet (4) is arranged inside the container (9), is positioned between the two suspension driving units and is mutually exclusive with the magnetic field directions of the two suspension driving units;

the suspension magnet (4) is kept suspended in the middle of the container (9) by magnetic field repulsive force of the upper suspension driving unit and the lower suspension driving unit, and synchronously reciprocates up and down along the inner wall of the container (9) along the coil (5) or vibrates in the coil in a reciprocating manner along the vibration of the low-frequency vibration component.

9. A vibration energy harvester according to claim 8 wherein the levitation drive unit comprises:

a top end fixed magnet (1) arranged at the top end of the container (9);

the top end elastic piece (2) is arranged in the container (9), the top of the top end elastic piece (2) is fixedly connected with the top end fixing magnet (1), and the bottom of the top end elastic piece (2) extends towards the middle of the container (9);

a top end gasket (3) fixedly connected to the bottom of the top end elastic piece (2);

a bottom-end fixed magnet (8) provided at the bottom end of the container (9);

the bottom end elastic part (7) is arranged in the container (9), the bottom of the bottom end elastic part (7) is fixedly connected with the bottom end fixing magnet (8), and the top of the bottom end elastic part (7) extends towards the middle of the container (9);

the bottom gasket (6) is fixedly connected to the top of the bottom elastic piece (7);

when the suspension magnet (4) upwards touches the bottom of the top gasket (3), the top elastic piece (2) contracts and pushes the suspension magnet (4) downwards to return to the middle coil position of the container (9);

when the suspension magnet (4) touches the top of the bottom gasket (6) downwards, the bottom elastic piece (7) contracts and pushes the suspension magnet (4) upwards to return to the middle coil position of the container (9).

Technical Field

The application relates to the technical field of electronic equipment, in particular to a self-powered electronic display screen based on electromagnetism and a vibration energy collector.

Background

With the continuous development of the information society, electronic devices such as mobile phones and flat panels are becoming popular, and the electronic devices play an increasingly important role in the daily life of people. Most electronic products need to be powered by batteries, but the batteries have the defects of limited endurance time, repeated charging, potential safety hazard, environmental friendliness and the like. In response to this problem, researchers have gradually proposed self-powering techniques. Self-powered technology is a new power supply technology, which can convert various energies in the surrounding environment into electric energy, thereby driving low-power electronic devices to operate, such as solar energy, mechanical energy, extrusion, friction, and the like.

In recent years, in the conversion mechanism from mechanical energy to electrical energy, various energy conversion mechanisms based on electromagnetic, piezoelectric, electrostatic, triboelectric nano-generation, etc. have been proposed and studied by many scholars. Wherein: the electromagnetic mode has the characteristics of no need of additional power supply and functional materials, large output current and the like, and is very suitable for driving a digital integrated device with low power consumption; the piezoelectric conversion structure is simple, and has the advantages of easy realization of device miniaturization, good electromechanical conversion performance, high energy density and the like; the electrostatic mode needs an external power supply as an initial voltage, cannot completely realize self-power supply, and has high voltage, low current and high output impedance output, so that the processing technology of the energy collecting device is complex and the efficiency is low; the friction nano mode can obtain larger voltage, but has low output current and limited use scene.

In electronic devices such as mobile phones and flat panels, the screen always consumes the most power. The power consumption of the screen is reduced, and the electric energy can be effectively saved. Compared with the traditional display technology, the electronic ink looks like printed characters, and can protect eyes; on the other hand, the power saving is a big characteristic of the electronic ink screen, after characters are refreshed, the characters can stay on the screen for a long time, extra electric energy is not needed, and only power is consumed when page turning is refreshed.

Disclosure of Invention

This application is not enough to prior art, provides a self-powered electronic display screen and vibration energy collector based on electromagnetism, and this application collects mechanical energy and effectively turns into the electric energy with it based on the electromagnetism mechanism, can directly be applied to and stablize the power supply to electronic display screen. The technical scheme is specifically adopted in the application.

In order to achieve the above object, there is provided 1 an electromagnetic-based self-powered electronic display, comprising: the vibration energy collector is arranged on the low-frequency vibration component and is provided with a suspension magnet suspended in the vibration energy collector and a coil surrounded outside the suspension magnet, the central axis direction of the coil is correspondingly consistent with the vibration direction of the low-frequency vibration component, the suspension magnet synchronously reciprocates along the central axis direction of the coil along the vibration direction of the low-frequency vibration component or vibrates in the coil in a reciprocating manner, and the coil is correspondingly excited to generate induced current and output induced electromotive force when the coil induces the change of the magnetic field intensity; the input end of the energy conversion circuit is connected with the coil of the vibration energy collector, the induced electromotive force generated by the vibration energy collector is received, the capacitor in the energy conversion circuit is repeatedly charged by the induced electromotive force, and stable power supply voltage is output through capacitor discharge; the microprocessor receives the power supply of the energy conversion circuit and outputs a display control signal; and the low-power-consumption display screen receives the power supply of the energy conversion circuit, is connected with the output end of the display control signal of the microprocessor, and responds to the display control signal output by the microprocessor to display a corresponding interface.

Optionally, the electromagnetically based self-powered electronic display screen of any preceding claim, wherein the vibration energy harvester comprises: a container, which is a hollow sleeve made of insulating material and is fixed on the low-frequency vibration component in parallel with the vibration direction; the coil is uniformly wound in the middle of the outer wall of the container; the suspension driving units are respectively arranged at the upper end and the lower end of the container, and the two suspension driving units are respectively arranged to have the same magnetic field direction; the suspension magnet is arranged in the container, is positioned between the two suspension driving units and is mutually exclusive with the magnetic field directions of the two suspension driving units; the suspension magnet is kept suspended in the middle of the container by the magnetic field repulsive force of the upper suspension driving unit and the lower suspension driving unit, and synchronously passes through the coil up and down in a reciprocating mode along the inner wall of the container or vibrates in the coil in a reciprocating mode along the vibration of the low-frequency vibration component.

Optionally, the self-powered electronic display screen based on electromagnetism described in any above, wherein the floating driving unit includes: a top end fixed magnet arranged at the top end of the container; the top end elastic piece is arranged in the container, the top of the top end elastic piece is fixedly connected with the top end fixed magnet, and the bottom of the top end elastic piece extends towards the middle of the container; the top end gasket is fixedly connected to the bottom of the top end elastic piece; a bottom end fixed magnet disposed at the bottom end of the container; the bottom end elastic piece is arranged in the container, the bottom of the bottom end elastic piece is fixedly connected with the bottom end fixed magnet, and the top of the bottom end elastic piece extends towards the middle of the container; the bottom gasket is fixedly connected to the top of the bottom elastic piece; when the suspension magnet upwards touches the bottom of the top gasket, the top elastic piece contracts and pushes the suspension magnet downwards to return to the middle coil position of the container; when the floating magnet touches the top of the bottom gasket downwards, the bottom elastic piece contracts and pushes the floating magnet upwards to return to the middle coil position of the container.

Optionally, the electromagnetic-based self-powered electronic display screen, wherein the energy conversion circuit includes a plurality of charge and discharge units sequentially cascaded between two ends of the coil, and each charge and discharge unit includes: the anode of the first charging capacitor is simultaneously connected with the cathode of the first diode in the charge-discharge unit of the current stage and the anode of the second diode, and the cathode of the first charging capacitor is connected with the anode of the second diode in the charge-discharge unit of the first stage or directly connected with the first end of the coil when the first charging capacitor is used as the charge-discharge unit of the first stage; the anode of the first diode is connected with the cathode of a second diode in the primary charging and discharging unit or is directly connected with the second end of the coil when being used as the primary charging and discharging unit and is also used as an output end of the power supply voltage; the cathode of the second charging capacitor is connected with the anode of the first diode, and the anode of the second charging capacitor is connected with the cathode of the second diode; and when the second diode is used as the last-stage charge-discharge unit, the negative electrode of the second diode is directly used as the output end to output the power supply voltage.

Optionally, the self-powered electronic display screen based on electromagnetism described in any above, wherein the low power consumption display screen is an electronic ink screen.

Meanwhile, in order to achieve the above object, the present application also provides a vibration energy harvester, which is provided on a vibration member, including: the suspension magnet is suspended in the suspension magnet, the coil surrounds the suspension magnet, the central axis direction of the coil is correspondingly consistent with the vibration direction of the low-frequency vibration component, the suspension magnet synchronously reciprocates through the coil along the central axis direction of the coil or vibrates in the coil in a reciprocating mode along the central axis direction of the coil along with the vibration of the low-frequency vibration component, and the coil is correspondingly excited to generate induced current and output induced electromotive force when inducted by the change of the magnetic field intensity.

Optionally, the vibration energy collector is fixedly arranged on the logistics transportation unit, and supplies power to a low power consumption display screen in the logistics transportation unit.

Optionally, a vibration energy harvester according to any of the above wherein the vibration energy harvester comprises: a container, which is a hollow sleeve made of insulating material and is fixed on the low-frequency vibration component in parallel with the vibration direction; the coil is uniformly wound in the middle of the outer wall of the container; the suspension driving units are respectively arranged at the upper end and the lower end of the container, and the two suspension driving units are respectively arranged to have the same magnetic field direction; the suspension magnet is arranged in the container, is positioned between the two suspension driving units and is mutually exclusive with the magnetic field directions of the two suspension driving units; the suspension magnet is kept suspended in the middle of the container by the magnetic field repulsive force of the upper suspension driving unit and the lower suspension driving unit, and synchronously passes through the coil up and down in a reciprocating mode along the inner wall of the container or vibrates in the coil in a reciprocating mode along the vibration of the low-frequency vibration component.

Optionally, the vibration energy harvester of any above, wherein the levitation drive unit comprises: a top end fixed magnet arranged at the top end of the container; the top end elastic piece is arranged in the container, the top of the top end elastic piece is fixedly connected with the top end fixed magnet, and the bottom of the top end elastic piece extends towards the middle of the container; the top end gasket is fixedly connected to the bottom of the top end elastic piece; a bottom end fixed magnet disposed at the bottom end of the container; the bottom end elastic piece is arranged in the container, the bottom of the bottom end elastic piece is fixedly connected with the bottom end fixed magnet, and the top of the bottom end elastic piece extends towards the middle of the container; the bottom gasket is fixedly connected to the top of the bottom elastic piece; when the suspension magnet upwards touches the bottom of the top gasket, the top elastic piece contracts and pushes the suspension magnet downwards to return to the middle coil position of the container; when the floating magnet touches the top of the bottom gasket downwards, the bottom elastic piece contracts and pushes the floating magnet upwards to return to the middle coil position of the container.

Advantageous effects

This application utilizes vibration energy collector, responds to in the vibration of low frequency vibration part and through the change of suspension magnet's upper and lower tremble production electromagnetic field to respond to in the corresponding change of magnetic field intensity through the coil, the excitation produces induced current and output induction electromotive force. Therefore, the considerable output of the energy under the 2-15Hz vibration frequency of the logistics transportation can be realized through the energy conversion circuit, so that the power is directly supplied to the low-power-consumption display screen, and the low-cost cyclic updating and displaying of the display information are realized.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:

FIG. 1 is a cross-sectional view of a vibration energy harvester useful in the present application;

FIG. 2 is a schematic diagram of a self-powered electronic display screen of the present application;

FIG. 3 is a graph of peak output voltage for a vibration energy harvester under excitation at different frequencies according to the present application;

FIG. 4 is a schematic diagram of an energy conversion circuit of the present application;

FIG. 5 is a graph of output voltage waveforms for a vibration energy harvester under different frequency excitations in accordance with the present application;

FIG. 6 is a schematic diagram of an implementation of a self-powered electronic display screen of the present application;

FIG. 7 is a functional block diagram of a self-powered electronic display screen of the present application;

figure 8 is a schematic diagram of a self-powered electronic display screen of the present application in logistics.

In the figure, 9 denotes a container; 5 denotes a coil; 1 denotes a top fixed magnet; 8 denotes a bottom end fixed magnet; 7 denotes a bottom end elastic member; 2 denotes a tip elastic member; 3 denotes a tip gasket; 6, bottom end pad; and 4, a levitation magnet.

Detailed Description

In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" as used herein is intended to include both the individual components or both.

The meaning of "inside and outside" in this application means that the direction from the coil on which the magnet is directed towards the internal levitating magnet is inside and vice versa with respect to the container itself; and not as a specific limitation on the mechanism of the device of the present application.

The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.

The meaning of "up and down" in this application means that when the vibration energy collector is correctly installed, the direction in which the bottom fixed magnet points to the top fixed magnet is up, and vice versa is down, and is not a specific limitation on the mechanism of the device of this application.

Figure 1 is a vibration energy harvester according to the present application disposed on a vibrating member, comprising:

a levitation magnet 4 levitated inside a container 9,

and a coil 5 surrounding the levitation magnet 4, located at the outer circumference of the container,

the central axis direction of the coil 5 corresponds to the vibration direction of the low-frequency vibration component, the suspension magnet 4 synchronously reciprocates through the coil 5 along the central axis direction of the coil or vibrates in the coil in a reciprocating manner along the vibration direction of the low-frequency vibration component, and the magnetic field intensity around the coil can be changed due to the relative displacement of the suspension magnet 4 and the coil, so that the coil is induced to the change of the magnetic field intensity by utilizing the Faraday battery induction law to correspondingly excite the coil to generate induced current and output induced electromotive force, and mechanical vibration energy is converted into electric energy.

Referring to fig. 3 and 5, the energy collector has stable energy output under the low-frequency vibration characteristic of 1g at 2-16 Hz. The peak-to-peak value of the output voltage of the vibration energy collector under different excitations of 5-16 Hz is larger than 1V, wherein when the excitation frequency is 7-10 Hz, the peak-to-peak value of the output voltage is larger than 1.5V, and when the excitation frequency is 9Hz, the peak-to-peak value of the output voltage is the largest and reaches 2.23V. Referring to fig. 5, the vibration energy collector disclosed by the application has a good response characteristic under the excitation of 5-16 Hz, and the output voltage is high as a whole.

Considering that vibration is inevitable in vehicle transportation due to the existence of suspension in logistics transportation, and the vibration frequency of logistics transportation is also between 2 and 15Hz, the application can further realize the collection of vibration energy in logistics transportation process through the circuit shown in FIG. 6 or FIG. 7 by installing the vibration energy collector on the logistics transportation unit, so that the vibration energy collector can supply power to the low-power-consumption display screen installed in the logistics transportation unit through the energy conversion circuit, thereby reducing the consumption of express waybills as express 'identity cards', and realizing the display and update of the waybills by using the logistics transportation unit which can be updated and the low-power-consumption display screen arranged on the logistics transportation unit. Therefore, the invention can further realize the collection of low-frequency vibration energy by using the low-frequency vibration which is not in time in the logistics transportation environment through the implementation mode of fig. 8, realize the self-power supply of the display screen on the transfer unit by using an electromagnetic mechanism, and replace the express waybill by using a self-powered display system so as to reduce the overall cost and realize the cyclic update of the waybill.

Referring to fig. 2 specifically, the waybill display system can be implemented by the vibration energy collector, and a low power consumption display screen such as an energy conversion circuit, a microprocessor, and an electronic ink screen which are matched with the vibration energy collector:

the vibration energy collector can be selected from the structure shown in fig. 1 and is fixedly arranged on the low-frequency vibration component, the vibration energy collector is provided with a suspension magnet 4 suspended inside the vibration energy collector and a coil 5 surrounding the suspension magnet 4, the central axis direction of the coil 5 corresponds to the vibration direction of the low-frequency vibration component, the suspension magnet 4 synchronously reciprocates across the coil 5 along the central axis direction of the coil or vibrates in the coil in a reciprocating manner along the central axis direction of the coil along with the vibration of the low-frequency vibration component, and the coil is correspondingly excited to generate induced current and output induced electromotive force due to the change of the magnetic field intensity;

the input end of the energy conversion circuit can be connected with the coil 5 of the vibration energy collector, the induced electromotive force generated by the vibration energy collector is received, the capacitor in the energy conversion circuit is repeatedly charged by the induced electromotive force, and stable power supply voltage is output through capacitor discharge; under the condition of no consideration of the load, when the alternating current power output by the energy collector is in a negative half cycle, the diode D1 is conducted, the alternating current power supplies charge the capacitor C1, and the voltage on the capacitor C1 is negative left and positive right; when the output is at the positive half cycle, D1 is turned off, D2 is turned on, and the ac power source and the voltage on C1 are superimposed to charge C2, where UC2=2 × UC 1. During the negative half of the second period, D1 and D2 are turned off, D3 is turned on, and the ac power supply, C1 and C2 are superimposed to charge C3, but since the polarities of C1 and the ac power supply are opposite at this time and cancel each other, UC3= UC 2; in the positive half cycle, D1, D2, D3 are turned off, D4 is turned on, and an alternating current power supply, C1, C2 and C3 are superposed to charge C4, and in the same way, UC4=2 × UC 1. To do so, after several ac cycles, all of the capacitors except C1 are twice the supply voltage, except that the capacitors are equal to the supply voltage. And the output voltage is equal to the series connection of the capacitor voltages of C2, C4, C6, C8 and C10. Thus achieving an output voltage equal to 10 times the input voltage.

The microprocessor can receive the power supply of the energy conversion circuit and output a display control signal;

and the low-power-consumption display screen can receive the power supply of the energy conversion circuit, is connected with the output end of the display control signal of the microprocessor, and responds to the display control signal output by the microprocessor to display a corresponding interface.

Therefore, under the implementation mode, the self-powered electronic display screen capable of being repeatedly applied to the logistics transportation unit can be realized through effective combination of the energy collector and the display screen. The energy conversion circuit realized by the energy collector and the rectifying and boosting circuit can directly replace a battery in the prior art as a power supply device, and effectively solves the environmental protection problem of the battery and the labor cost of charging.

The module structure of the energy conversion device based on the electromagnetic mechanism adopted by the invention can be shown in figure 1, and the energy conversion device comprises:

a container 9, which is a hollow sleeve made of insulating material and is fixed on the low-frequency vibration component in parallel with the vibration direction;

the coil 5 is uniformly wound in the middle of the outer wall of the container 9 and can be realized by a copper wire winding, the coil can be directly wound in the middle of the spring container, and the wire diameter and the number of turns of the coil can be designed and adjusted according to the actual requirements and size limitations of different application scenes;

suspension driving units respectively arranged at the upper and lower ends of the container 9, the two suspension driving units being respectively arranged to have the same magnetic field direction;

the suspension magnet 4 is arranged inside the container 9, is positioned between the two suspension driving units and is mutually exclusive with the magnetic field directions of the two suspension driving units;

the suspension magnet 4 is kept suspended in the middle of the container 9 by the magnetic field repulsive force of the upper suspension driving unit and the lower suspension driving unit, and synchronously reciprocates up and down along the inner wall of the container 9 along the coil 5 or vibrates in the coil in a reciprocating manner along the vibration of the low-frequency vibration part.

During the concrete realization, two upper and lower suspension drive units can specifically realize through a pair of fixed magnet, a pair of elastic component and a pair of gasket:

wherein, the top end is fixed with the magnet 1, which can be realized by a permanent magnet (neodymium magnet) with smooth appearance, and the magnet can be arranged at the top end of the container 9;

the top end elastic piece 2 is arranged in the container 9, the top of the top end elastic piece 2 is fixedly connected with the top end fixed magnet 1, and the bottom of the top end elastic piece 2 extends to the middle of the container 9;

a top end gasket 3 fixedly connected to the bottom of the top end elastic member 2;

a bottom fixed magnet 8, which can also be realized by a permanent magnet (neodymium magnet) with smooth appearance, is arranged at the bottom of the container 9;

the bottom end elastic piece 7 is arranged in the container 9, the bottom of the bottom end elastic piece 7 is fixedly connected with the bottom end fixing magnet 8, and the top of the bottom end elastic piece 7 extends towards the middle of the container 9;

the bottom gasket 6 is fixedly connected to the top of the bottom elastic piece 7;

in order to facilitate the up and down movement of the levitating magnet 4, the magnetic field distribution in the coil is changed, so that it can be realized by a permanent magnet (neodymium magnet) with smooth appearance. The magnetic arrangement of the 3 magnets is arranged in such a way that two adjacent magnets repel each other, namely, the N pole of the fixed magnet 1 is close to the N pole of the floating magnet, and the S pole of the fixed magnet 2 is close to the S pole of the floating magnet (or the S pole of the fixed magnet 1 is close to the S pole of the floating magnet, and the N pole of the fixed magnet 2 is close to the N pole of the fixed magnet 2). The diameter of the stationary magnet 1 and the stationary magnet 2 should be larger than the inner diameter of the container. The diameter of the levitating magnet should be less than the inner diameter of the container. The specific size (diameter, thickness) of the 3 magnets can be designed and determined according to the actual application scene. Thus, when the floating magnet 4 touches the bottom of the top gasket 3 upwards, the top elastic piece 2 contracts and pushes the floating magnet 4 downwards to return to the middle coil position of the container 9; and when the levitating magnet 4 touches down on top of the bottom end spacer 6, the bottom end elastic member 7 contracts and pushes the levitating magnet 4 upward to return to the middle coil position of the container 9. The suspension magnet 4 is located between the spring 1 and the spring 2 in the container and can move in two directions in the two springs, so that a magnetic field in the coil changes, induced electromotive force and induced current are correspondingly excited, vibration of the logistics unit is converted into electric energy, the electric energy is supplied and output in a specific form through the energy conversion circuit, power supply to the display screen is achieved, the display screen is supported to display or update express waybill information on the display screen in real time, and recycling of the express logistics transfer unit is achieved.

In the above implementation manner, the energy conversion circuit for implementing the boosting function can be implemented by a plurality of charging and discharging units sequentially cascaded between two ends of the coil through the circuit shown in fig. 4. Wherein, each grade charge-discharge unit is equallyd divide and is set up respectively to include:

the anode of the first charging capacitor is simultaneously connected with the cathode of the first diode in the charge-discharge unit of the current stage and the anode of the second diode, and the cathode of the first charging capacitor is connected with the anode of the second diode in the charge-discharge unit of the first stage or directly connected with the first end of the coil 5 when the first charging capacitor is used as the charge-discharge unit of the first stage;

the anode of the first diode is connected with the cathode of a second diode in the primary charging and discharging unit or is directly connected with the second end of the coil 5 when being used as the primary charging and discharging unit and is also used as an output end of the power supply voltage;

the cathode of the second charging capacitor is connected with the anode of the first diode, and the anode of the second charging capacitor is connected with the cathode of the second diode;

and when the second diode is used as the last-stage charge-discharge unit, the negative electrode of the second diode is directly used as the output end to output the power supply voltage.

Thus, due to the energy harvesting strategy of the above circuit, a large number of capacitors are employed to achieve energy conversion. And therefore needs to be charged. And there is a time difference in the charging and discharging times. The charging time tends to be less than the charging time. The invention therefore proposes a charging strategy in which the charging time is less than the discharging time. Under the condition of no consideration of the load, when the alternating current power output by the energy collector is in a negative half cycle, the diode D1 is conducted, the alternating current power supplies charge the capacitor C1, and the voltage on the capacitor C1 is negative left and positive right; when the output is at the positive half cycle, D1 is turned off, D2 is turned on, and the ac power source and the voltage on C1 are superimposed to charge C2, where UC2=2 × UC 1. During the negative half of the second period, D1 and D2 are turned off, D3 is turned on, and the ac power supply, C1 and C2 are superimposed to charge C3, but since the polarities of C1 and the ac power supply are opposite at this time and cancel each other, UC3= UC 2; in the positive half cycle, D1, D2, D3 are turned off, D4 is turned on, and an alternating current power supply, C1, C2 and C3 are superposed to charge C4, and in the same way, UC4=2 × UC 1. To do so, after several ac cycles, all of the capacitors except C1 are twice the supply voltage, except that the capacitors are equal to the supply voltage. And the output voltage is equal to the series connection of the capacitor voltages of C2, C4, C6, C8 and C10. Thus achieving an output voltage equal to 10 times the input voltage. As can be seen from the analysis of the circuit of fig. 4, the output voltage reached 3V when the charging time was 0.525s, and increased to 5V when the charging time reached 3.5s, followed by a small amplitude of fluctuation in the voltage value within this range. Analysis of the voltage doubling circuit shows that when the capacitance is increased, the output voltage is increased, when the capacitance is increased, the time when the output voltage reaches a stable state can be effectively reduced, the increase of the capacitance can slightly increase the output voltage, but the time when the output voltage reaches the stable state is not greatly influenced, and the increase of the capacitances C4, C5, C6, C7, C8, C9 and C10 does not greatly influence the output voltage, but can prolong the time when the output voltage enters the stable state, so that a certain optimization effect can be achieved by changing 6 capacitances simultaneously.

In summary, the present application has the following advantages:

the electromagnetic self-powered electronic display system is innovatively combined with an electromagnetic mechanism and an electronic ink screen display technology, and is based on electric energy collected by a vibration energy collector, and an energy conversion, management and storage circuit, a microprocessor, a low-power-consumption display and a wireless data transceiver matched with the electric energy collector form the electromagnetic self-powered electronic display system together. The display system can complete data reception and make required information display without an external power supply, is not limited by wiring, is flexible in installation position, and can be applied to various human-computer interaction scenes. Different from the electromagnetic conversion mechanism adopted in most of the existing vibration energy collection technologies, the electronic display screen based on the electromagnetic mechanism energy collection can directly realize stable voltage supply through vibration so as to stably display waybill content, and repeatedly update and utilize the waybill content.

The invention innovatively provides an electromagnetic energy collector suitable for low-frequency vibration environments such as logistics transportation and the like, and vibration is inevitable during vehicle transportation due to the existence of suspension in logistics transportation. In the case of electromagnetic energy collectors, it becomes very important whether the external vibration frequency is the resonant frequency of the electromagnetic energy collector itself. According to the research of the relevant documents, the vibration frequency of the logistics transportation is between 2 and 15 Hz. The electromagnetic energy harvester of the present invention is capable of considerable energy output at this frequency.

The invention innovatively provides an energy conversion optimization strategy. The collected output of the vibration energy is low voltage and ac, while for low power consumption appliances, high voltage and dc are required. Therefore, the invention not only designs the rectifying and boosting module capable of realizing energy conversion, but also provides innovation on the energy conversion efficiency of the module.

Therefore, compared with the publicly released electronic equipment technology, the invention provides a solution for replacing the traditional energy source by a self-powered energy collection mechanism, thereby not only solving the problem of complicated charging, but also solving the environmental protection problem caused by the lithium battery. Compared with the research result related to the energy collection field, the electromagnetic energy collector can output considerable energy in the low frequency of 2-15 Hz. Therefore, the invention has great development prospect in low-frequency vibration environments such as logistics transportation and the like.

The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.