CN117375264A - A high-efficiency electric energy integration device based on vibration energy harvesting - Google Patents

Abstract

The utility model provides a high-efficient electric energy integrated device based on vibration energy-taking, includes multistage transmitting circuit, multistage transmitting coil, receiving circuit and rectifier circuit, transmitting circuit series connection is in on transmitting coil's the return circuit, transmitting circuit includes the voltage source, the voltage source is the equivalent voltage source that is provided by vibration energy harvester, vibration energy harvester converts vibration energy into electric energy back output, transmitting coil is with the mode of wireless transmission energy with resonant frequency electric energy transmission for receiving coil, receiving coil passes through receiving circuit output current, after the rectifier circuit rectification, for the power consumption load power supply. The integration of electric energy obtained by vibration is realized through stacking of the multistage transmitting circuits by the collected vibration energy, the output power of the whole vibration energy collecting system is effectively improved, and the self-powered device can be used for effectively and reliably supplying power to small electric equipment in a strong vibration environment.

Description

A high-efficiency electric energy integration device based on vibration energy harvesting

Technical field

The present invention relates to vibration energy recovery and utilization technology, and in particular to a high-efficiency electric energy integration device based on vibration energy harvesting.

Background technique

Energy supply is a key issue that determines whether electrical equipment can work sustainably and stably. In view of the problems of battery power supply such as limited life, chemical pollution, large size and mass, researchers around the world are working hard to find ways to obtain energy from the environment to realize self-powering of electronic devices. Compared with solar energy, thermal energy, magnetic energy and nuclear energy, vibration energy is ubiquitous and manifests in extremely diverse forms, such as the ups and downs of ocean waves, the beating of the heart, the jumping of the pulse, and even vibrations generated by train operation, mechanical equipment operation, and car driving. Advances in micro- and nanotechnology, as well as mechanical and materials engineering, have made it possible to harvest energy from these ubiquitous vibrations. As a green and renewable energy, vibration energy's recovery and utilization have become the focus of widespread research attention by researchers.

However, existing vibration energy harvesters (VEHS) have core problems of low output power and low conversion efficiency. In many cases, the electrical energy output by vibration energy harvesters is very small, which is not enough to meet the power of some equipment. need. In addition, although vibration energy harvesters can collect vibration energy in the environment, their conversion efficiency into electrical energy is usually not high, which limits their applications.

It should be noted that the information disclosed in the above background section is only for understanding the background of the present application, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art.

Contents of the invention

The main purpose of the present invention is to overcome the defects of the above background technology and provide a high-efficiency electric energy integration device based on vibration energy harvesting.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A high-efficiency electric energy integrated device based on vibration energy harvesting, including a multi-stage transmitting circuit, a multi-stage transmitting coil, a receiving coil, a receiving circuit and a rectifier circuit. The transmitting circuit is connected in series to the loop of the transmitting coil. The circuit includes a voltage source. The voltage source is an equivalent voltage source provided by a vibration energy harvester. The vibration energy harvester converts vibration energy into electrical energy and outputs it. The transmitter coil wirelessly transmits energy to the resonant frequency. Electric energy is transmitted to the receiving coil, and the receiving coil outputs current through the receiving circuit. After being rectified by the rectifying circuit, it supplies power to the electrical load.

Further, the series number is greater than or equal to 3.

The transmitting circuit also includes a fully controlled switch tube, a filter circuit, a resonant capacitor and an equivalent resistor connected in series in the loop, wherein the fully controlled switch tube controls the input of the transmitting circuit and the transmitting coil. and cut out.

The fully controlled switch tube is a gallium nitride or silicon carbide semiconductor device.

The filter circuit includes a filter capacitor and a filter inductor, the resonant frequency of which is the same as the resonant frequency of the vibration energy harvester.

There is a strong coupling between each transmitting coil and the receiving coil, and a weak coupling between the transmitting coils.

The transmitting circuit includes a transmitting end resonant capacitor, the receiving circuit includes a receiving end resonant capacitor, a front-stage resonant circuit composed of the transmitting end resonant capacitor and the transmitting coil, and the receiving end resonant capacitor and the receiving coil. The resonant frequencies of the subsequent resonant circuits are the same.

It also includes a voltage stabilizing circuit connected after the rectifier circuit.

The vibration energy harvester is any one of an electrostatic vibration energy harvester, a piezoelectric vibration energy harvester, an electromagnetic vibration energy harvester, a piezomagnetic vibration energy harvester, and a mechanical vibration energy harvester.

The electrical load is a direct electrical equipment or battery.

The invention has the following beneficial effects:

The invention provides a high-efficiency electric energy integrated device based on vibration energy harvesting, which includes a multi-stage transmitting circuit, a multi-stage transmitting coil and a receiving coil. An equivalent voltage source provided by a vibration energy collector is connected in series to the loop of the transmitting coil. The stacking of multi-stage transmitting circuits realizes the integration of obtaining electric energy from vibration. After converting the vibration energy into electric energy, the multi-stage transmitting coil transmits the resonant frequency electric energy to the receiving coil through wireless transmission of energy. The receiving coil outputs through the receiving circuit. The current, after being rectified by the rectifier circuit, supplies power to the electrical load. Through the high-efficiency electric energy integration device based on vibration energy harvesting of the present invention, the collected vibration energy is integrated with the electric energy obtained by vibration through the stacking of multi-stage transmitting circuits, which effectively improves the output power of the entire vibration energy collection system and can provide strong vibration Efficient and reliable self-power supply for small electrical equipment in the environment is of great significance to the long-term reliable power supply of small electrical equipment in strong vibration environments. It has high application value and good application in the field of renewable vibration energy applications. prospect.

Other beneficial effects in embodiments of the present invention will be further described below.

Description of the drawings

Figure 1 is a schematic structural diagram of a high-efficiency electric energy integration device based on vibration energy harvesting according to an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is exemplary only and is not intended to limit the scope of the invention and its applications.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, a connection may be used for a fixing function or for a coupling or connecting function.

It should be understood that the terms "length", "width", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top" The orientations or positional relationships indicated by "bottom", "inner", "outside", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply. The devices or elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore are not to be construed as limitations of the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

Referring to Figure 1, an embodiment of the present invention provides a high-efficiency electric energy integration device based on vibration energy harvesting, including an n-level transmitting circuit, n-level transmitting coils L1, L2...Ln, a receiving coil Lr, a receiving circuit and a rectifier circuit. Each transmitting circuit Correspondingly connected in series on the loop of each transmitting coil, the transmitting circuit includes voltage sources V1, V2...Vn, and the voltage sources V1, V2...Vn are equivalent voltages provided by a vibration energy harvester (not shown) source, the vibration energy collector converts vibration energy into electrical energy and outputs it. The transmitting coils L1, L2...Ln transmit the resonant frequency electrical energy to the receiving coil Lr by wirelessly transmitting energy. The receiving coil Lr passes The output current of the receiving circuit, after being rectified by the rectifier circuit, supplies power to the electrical load R _L. In a preferred embodiment, the number of stages n of the transmitting circuit and the transmitting coil is greater than or equal to 3. The electrical load R _L can be a direct electrical equipment or a battery.

In the high-efficiency electric energy integration device based on vibration energy harvesting in the embodiment of the present invention, the integration of electric energy obtained by vibration is realized through the stacking of multi-stage transmitting circuits, and then the resonant frequency electric energy is transmitted to the receiving coil in a wireless energy transmission manner, and the rectified output is Then it provides power supply for the electrical load, which effectively improves the output power of the entire vibration energy collection system, and can provide efficient and reliable self-power supply for small electrical equipment in strong vibration environment.

Referring to Figure 1, in a preferred embodiment, the transmitting circuit also includes fully controlled switching tubes S1, S2...Sn, filter circuits, resonant capacitors C1, C2...Cn, etc., which are connected in series in each of the loops. Effective resistors R1, R2...Rn, wherein the fully controlled switches S1, S2...Sn control the input and output of the corresponding transmitting circuit and the transmitting coil. The fully controlled switch tube can control the on and off of the circuit. In the above-mentioned high-efficiency electric energy integration device based on vibration energy harvesting, the fully controlled switch tube can control the input and output of each stage of the transmitting circuit and the transmitting coil. Thereby realizing the control and transmission of electric energy. The fully controlled switch transistor may be a gallium nitride or silicon carbide semiconductor device.

By adjusting the conduction and disconnection of the fully controlled switch Sn, the transmission and distribution of electric energy can be effectively controlled, improving the efficiency of the entire circuit and extending the service life of the equipment. At the same time, according to the power demand on the load side, the fully controlled switch Sn can be selected to be turned on or off to put in or cut off the corresponding transmitting circuit and transmitting coil, and flexibly adjust the output power level of the power integrated device. When an abnormality occurs in the circuit, it can also quickly cut off the circuit to protect the circuit from damage.

In one embodiment, the filter circuit in each of the transmitting circuits includes corresponding capacitors Cs1, Cs2...Csn and inductors Ls1, Ls2...Lsn connected in series.

In a preferred embodiment, the resonant frequency of the filter circuit composed of the filter capacitor and the filter inductor is the same as the resonant frequency of the vibration energy harvester. Through this design, the frequency characteristics of the system can be better matched, the energy transmission efficiency can be improved, and harmonic interference and noise in the circuit can be effectively filtered.

In a preferred embodiment, each transmitting coil is strongly coupled to the receiving coil, and each transmitting coil is weakly coupled to each other. The strong coupling between the transmitting coil and the receiving coil can make the energy transmission between the transmitting coil and the receiving coil more efficient, while the weak coupling between the transmitting coils can avoid mutual interference between the transmitting coils, thus ensuring the stability of the entire system. , you can also easily control the working status of each transmitting coil.

Referring to Figure 1, in a preferred embodiment, the transmitting circuit includes a transmitting end resonant capacitor C1, C2...Cn, the receiving circuit includes a receiving end resonant capacitor Cr and a receiving end equivalent resistance Rr (the receiving end equivalent resistance Rr The resistance does not include the load _RL ). The resonant frequency of the front-stage resonant circuit composed of the transmitting end resonant capacitor Cn and the transmitting coil is the same as the rear-stage resonant circuit composed of the receiving end resonant capacitor Cr and the receiving coil. This design can reduce losses during power transmission, optimize power transmission efficiency, and better stabilize the frequency of the entire system and improve system stability.

Referring to Figure 1, in one embodiment, the rectifier circuit includes a rectifier bridge composed of four diodes D1, D2, D3, and D4. In a preferred embodiment, the output filter capacitor Cout can be connected after the rectifier circuit. In a preferred embodiment, a voltage stabilizing circuit may be provided after the rectifier circuit.

In various embodiments, the vibration energy harvester may be an electrostatic vibration energy harvester, a piezoelectric vibration energy harvester, an electromagnetic vibration energy harvester, a piezomagnetic vibration energy harvester, or a mechanical vibration energy harvester. Any type of energy harvester.

The invention provides a high-efficiency electric energy integrated device based on vibration energy harvesting, which includes a multi-stage transmitting circuit, a multi-stage transmitting coil and a receiving coil. The equivalent voltage source Vn provided by the vibration energy collector is connected in series to the loop of the transmitting coil. The stacking of multi-stage transmitting circuits realizes the integration of obtaining electric energy from vibration. After converting the vibration energy into electric energy, the multi-stage transmitting coil transmits the resonant frequency electric energy to the receiving coil through wireless transmission of energy. The receiving coil passes through the receiving circuit. The output current, after rectification by the rectifier circuit, supplies power to the electrical load. Through the high-efficiency electric energy integration device based on vibration energy harvesting of the present invention, the collected vibration energy is integrated with the electric energy obtained by vibration through the stacking of multi-stage transmitting circuits, which effectively improves the output power of the entire vibration energy collection system and can provide strong vibration Efficient and reliable self-power supply for small electrical equipment in the environment is of great significance to the long-term reliable power supply of small electrical equipment in strong vibration environments. It has high application value and good application in the field of renewable vibration energy applications. prospect.

As shown in Figure 1, in a specific embodiment, the device includes an n-level transmitting circuit, an n-level transmitting coil, a receiving coil, a receiving circuit and a rectifier circuit. The transmitting circuits at all levels include voltage sources V1, V2...Vn obtained from vibration energy, fully controlled switching tubes S1, S2...Sn, filter circuits, resonant capacitors C1, C2...Cn and equivalent resistors R1, R2...Rn. The voltage source Vn is provided by the vibration energy harvester. The vibration energy harvesters at all levels have the same model and output the maximum power at the resonant frequency. The fully controlled switches S1, S2...Sn are gallium nitride or silicon carbide semiconductor devices, which can control the input and output of each stage of the transmitter circuit and transmitter coil. The filter circuit is composed of filter capacitors Cs1, Cs2...Csn and filter inductors Ls1, Ls2...Lsn, and its resonant frequency is the same as the resonant frequency of the vibration energy harvester. The number of turns of the transmitting coil and the receiving coil is greater than or equal to 1. There is strong coupling between each transmitting coil and the receiving coil, and the mutual inductance is strong; the coupling between each transmitting coil is weak. The receiving circuit is composed of a resonant capacitor at the receiving end and a rectifier and voltage stabilizing circuit. The rectifier and voltage stabilizing circuit converts the alternating current received by the receiving coil into direct current and supplies it to the electrical load, which is a direct electrical device or battery. The resonant frequency of the front-stage resonant circuit composed of the transmitting coil resonant capacitor and the transmitting coil at each stage and the subsequent-stage resonant circuit composed of the receiving coil and the receiving end resonant capacitor are the same.

The present invention proposes an efficient electric energy integration device based on vibration energy harvesting, thereby increasing the output power of the entire system, and is of great significance to the long-term reliable power supply of small electrical equipment in strong vibration environments. The invention can realize the collection and integration of vibration energy and provide efficient and reliable self-power supply for small electrical equipment. Compared with traditional technology, the present invention has higher integration and efficiency, can effectively increase the output power of the entire system, and is of great significance to the long-term reliable power supply of small electrical equipment in strong vibration environments.

The Background section of the present invention may contain background information about the problem or environment of the present invention and is not necessarily a description of prior art. Therefore, the inclusion in the Background section is not an admission by the applicant of prior art.

The above content is a further detailed description of the present invention in combination with specific/preferred embodiments, and it cannot be concluded that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, they can also make several substitutions or modifications to the described embodiments without departing from the concept of the present invention, and these substitutions or modifications should be regarded as belong to the protection scope of the present invention. In the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples" is intended to be in conjunction with the implementation. An example or example describes a specific feature, structure, material, or characteristic that is included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples unless they are inconsistent with each other. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the patent application.

Claims (10)

1. A high-efficiency electric energy integrated device based on vibration energy harvesting, characterized in that it includes a multi-stage transmitting circuit, a multi-stage transmitting coil, a receiving coil, a receiving circuit and a rectifier circuit, and the transmitting circuit is connected in series to the transmitting coil. On the loop, the transmitting circuit includes a voltage source. The voltage source is an equivalent voltage source provided by a vibration energy collector. The vibration energy collector converts vibration energy into electrical energy and outputs it. The transmit coil transmits wirelessly. The resonant frequency electric energy is transmitted to the receiving coil in the form of energy, and the receiving coil outputs current through the receiving circuit. After being rectified by the rectifying circuit, it supplies power to the electrical load. 2. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 1, characterized in that the number of stages is greater than or equal to 3. 3. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 1 or 2, characterized in that the transmitting circuit further includes a fully controlled switch tube, a filter circuit, and a resonant capacitor connected in series in the loop. and equivalent resistance, wherein the fully controlled switch tube controls the input and output of the transmitting circuit and the transmitting coil. 4. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 3, characterized in that the fully controlled switch tube is a gallium nitride or silicon carbide semiconductor device. 5. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 3, wherein the filter circuit includes a filter capacitor and a filter inductor, the resonant frequency of which is the same as the resonant frequency of the vibration energy harvester. 6. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 1 or 2, characterized in that each transmitting coil and the receiving coil are strongly coupled, and each transmitting coil is weakly coupled to each other. 7. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 1 or 2, characterized in that the transmitting circuit includes a transmitting end resonant capacitor, the receiving circuit includes a receiving end resonant capacitor, and the transmitting end resonates The resonant frequency of the front-stage resonant circuit composed of the capacitor and the transmitting coil and the subsequent-stage resonant circuit composed of the receiving end resonant capacitor and the receiving coil are the same. 8. The high-efficiency electric energy integration device based on vibration energy harvesting according to claim 1 or 2, further comprising a voltage stabilizing circuit connected after the rectifier circuit. 9. The high-efficiency electric energy integration device based on vibration energy harvesting as claimed in claim 1 or 2, characterized in that the vibration energy harvester is an electrostatic vibration energy harvester, a piezoelectric vibration energy harvester, or an electromagnetic vibration energy harvester. Any of energy harvesters, piezomagnetic vibration energy harvesters, and mechanical vibration energy harvesters. 10. The high-efficiency electric energy integration device based on vibration energy extraction according to claim 1 or 2, characterized in that the electric load is a direct electric equipment or a battery.