Radio frequency energy and vibration energy collaborative energy collection system
By designing a coordinated energy harvesting system for RF energy and vibration energy, and using dielectric resonator antennas and piezoelectric oscillators to capture multiple energy sources, the problem of unstable collection of traditional battery power and single energy source is solved, and the continuous and stable power supply to the sensor and the improvement of energy harvesting efficiency are achieved.
Patent Information
- Application Number
- CN202510143929.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-05-13
AI Technical Summary
In harsh environments such as cross-sea bridges and tunnels, traditional battery power supply is difficult to ensure the continuous and stable power supply of sensors, and the collection of a single energy source has problems such as poor sustainability and limited conversion energy.
Design a coordinated energy harvesting system for RF energy and vibration energy, and capture RF energy and vibration energy simultaneously through dielectric resonator antennas and piezoelectric vibrators, and integrate and switch through power management circuits to ensure continuous power supply of the sensor.
The continuous and stable power supply to low-power sensors is achieved, the problem of instability of a single energy collection system is overcome, and the energy collection efficiency of the system is improved through the coordinated work of radio frequency and vibration energy.
Smart Images
Figure CN119995130A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of energy collection and radio frequency circuits, and relates to a radio frequency energy and vibration energy cooperative energy collection system. Background Art
[0002] In IoT applications, miniaturized and low-power wireless sensor devices play a vital role. Wireless energy harvesting technology can get rid of the constraints of batteries and realize self-powering of the system by collecting various types of energy in space, becoming the main way to solve the power supply of sensor nodes. There are solar energy, wind energy, vibration energy, etc. in space, but these energy sources are unstable and intermittent and need to rely on specific environmental conditions. Ubiquitous wireless communication makes radio frequency energy widely present in space and is not affected by weather conditions, but the relatively low radio frequency energy density in space leads to limited converted DC energy. It can be seen that the collection of a single energy source has problems such as poor sustainability and limited conversion energy. Therefore, it is urgent to propose a hybrid energy harvesting method to make full use of the advantages of each energy conversion, coordinate the design of different energy sources, reduce excessive dependence on a single energy source, and thus achieve stable power supply for the system.
[0003] In application scenarios such as bridges and tunnels, the safety monitoring system of bridges and tunnels requires a variety of wireless sensors to regularly collect various status information of bridges and tunnels, such as acceleration sensors, displacement sensors, temperature sensors, etc. However, large bridges and tunnels are usually built in relatively harsh environments, such as on the ocean or in mountainous areas. Conventional battery power supply is difficult to ensure continuous power supply of the system due to limited power, and it is difficult to perform regular manual maintenance due to harsh or complex working conditions. However, the safety monitoring of bridges and tunnels is of great importance and directly affects people's personal and property safety. This puts strict requirements on the power supply of sensors, and requires the power supply system to be able to provide continuous and stable power supply to ensure the safety monitoring of various sensors. Using energy harvesting technology to obtain energy from the surrounding environment and effectively convert it into electrical energy can get rid of the constraints of batteries and realize self-powering of sensors, which is of great significance for the construction of safety monitoring systems for cross-sea bridges or tunnels. Therefore, the present invention aims at application scenarios such as cross-sea bridges and tunnels, and utilizes the vibration energy generated when a vehicle passes through a bridge or tunnel, and the abundant radio frequency energy existing in multiple communication base stations arranged on the bridge or in the tunnel, and designs a radio frequency energy and vibration energy collaborative energy collection system. The radio frequency energy and vibration energy are collected at the same time to form a power supply system in which the main energy and backup energy work together, so as to provide continuous and stable power supply for the sensor and realize safe monitoring of bridges and tunnels. Summary of the invention
[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the existing technology. In order to enable the designed energy harvesting system to continuously and stably power low-power sensors, a radio frequency energy and vibration energy collaborative energy harvesting system is proposed, which can simultaneously capture radio frequency energy and vibration energy in the environment. In the proposed system, a dielectric resonator antenna is integrated into the tip of the piezoelectric vibrator and used as a mass block to improve the vibration energy collection resonant frequency. At the same time, the radio frequency energy collector is equipped with a radio frequency rectifier circuit with a power distribution function to solve the problems of narrowing the power range and reducing efficiency after the radio frequency rectifier circuit is connected to the DC-DC boost converter in the prior art.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is:
[0006] A radio frequency energy and vibration energy collaborative energy collection system, the collection system includes four parts: a radio frequency energy collection system, a vibration energy collection system, a power management circuit and an energy storage device. The radio frequency energy collection system includes a dielectric resonator antenna, a radio frequency rectification circuit, a DC-DC boost converter and an energy storage device, wherein the dielectric resonator antenna receives the radio frequency energy in the environment and then connects to the radio frequency rectification circuit, which is then connected to the DC-DC boost converter, and finally connected to the first energy storage device I. The vibration energy collection system includes a piezoelectric vibrator, a rectification and voltage stabilization circuit and an energy storage device, wherein the piezoelectric vibrator senses the vibration energy in the environment and then connects to the rectification and voltage stabilization circuit, which is then connected to the second energy storage device II. The power management circuit includes a DC-DC boost converter, and the energy storage device in the vibration energy system is connected to the radio frequency DC-DC boost converter, integrating the two energy sources of radio frequency energy and vibration energy, using radio frequency energy as the main energy source and vibration energy as the backup energy source, and can achieve free switching between the two. The energy storage device is the first energy storage device I and the second energy storage device II.
[0007] The radio frequency energy collection system is specifically as follows:
[0008] The dielectric resonator antenna includes a dielectric block layer 1, a first metal layer 2, a substrate layer 3, and a second metal layer 4. The dielectric block layer 1 is a rectangular parallelepiped structure, the first metal layer 2 is a long strip structure, the substrate layer 3 is a plate structure, and the second metal layer 4 has the same structure as the substrate layer 3. The first metal layer 2 is attached to the upper surface of the substrate layer 3, and the dielectric block layer 1 is arranged on the upper surface of the first metal layer 2. The second metal layer 4 is attached to the lower surface of the substrate layer 3. The dielectric block layer 1 is an antenna radiation device, the first metal layer is used as antenna feed, the substrate layer is a dielectric resonator antenna substrate, and the second metal layer 4 is ground. Furthermore, the dielectric constant of the dielectric block layer 1 is 60. The material of the first metal layer 2 and the second metal layer 4 is metal copper. The material of the second metal layer 3 is Rogers 4350B.
[0009] The dielectric resonator antenna is connected to the RF rectifier circuit through a 50Ω SMA adapter and a transmission line. The RF rectifier circuit includes an impedance matching network, a DC blocking capacitor C1, a rectifier I, a rectifier II, and a low-pass filter. After the output end of the impedance matching network is connected to the DC blocking capacitor C1, it is connected in parallel with the rectifier branch I and the rectifier branch II, and finally a low-pass filter is connected in series. In the RF rectifier circuit, the impedance matching network is used to accurately match the input impedance of the RF rectifier circuit to 50Ω to ensure efficient signal transmission; the DC blocking capacitor C1 is used to block DC and help the RF rectifier circuit build a correct DC loop; the low-pass filter is used to avoid signal high-order harmonic interference and ensure the purity of the electrical energy.
[0010] Further, the impedance matching network includes TL0, TL1, open branch node I, TL2, and open branch node II. A 50Ω SMA adapter is welded to the front end of TL0 to connect to the dielectric resonator antenna, and then connected to TL1. TL1 is connected in parallel to open branch node I. Open branch node I is connected to TL2. TL2 is connected in parallel to open branch node II. Open branch node II is connected to a DC blocking capacitor C1.
[0011] Furthermore, the rectifier I includes a low-pass filter I and a low-power diode D1. The low-pass filter I is connected to the rear end of the DC blocking capacitor C1 and is connected to the positive electrode of the low-power diode D1, and the negative electrode of the low-power diode D1 is grounded.
[0012] Furthermore, the rectifier II includes a power division network, a low-pass filter II, a first high-power diode D2, and a second high-power diode D3. The power division network is connected in parallel with the rear end of the DC blocking capacitor C1 and connected to the low-pass filter II, the low-pass filter II is connected to the positive electrode of the first high-power diode D2, the negative electrode of the first high-power diode D2 is connected to the positive electrode of the second high-power diode D3, and the negative electrode of the second high-power diode D3 is grounded.
[0013] The DC-DC boost converter is connected to the radio frequency rectification circuit.
[0014] The first energy storage device I is connected to the DC-DC boost converter.
[0015] The vibration energy harvesting system is specifically as follows:
[0016] The piezoelectric vibrator includes a first piezoelectric layer 5, a second piezoelectric layer 6, a substrate layer 7, and a metal via 8. The first piezoelectric layer 5 and the second piezoelectric layer 6 are respectively covered on the upper and lower sides of the substrate layer 7 to form a bimorph structure. The rear end of the piezoelectric vibrator is connected to a rectifier and voltage regulator circuit. The rectifier and voltage regulator circuit is connected to a second energy storage device II. The second energy storage device II is connected to a power management circuit.
[0017] The power management circuit includes a DC-DC boost converter and has an energy switching function, which can use radio frequency energy as the main energy under normal working conditions. When the main energy is insufficient, it switches to the backup energy to continue supplying power.
[0018] The dielectric resonator antenna is located at the tip of the piezoelectric vibrator in the entire system component, that is, the second metal layer 4 covers the substrate layer 7 .
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] (1) The present invention simultaneously collects radio frequency energy and vibration energy in the environment through a power management circuit, thereby overcoming the instability problem of a single energy collection system when powering low-power sensors, and providing continuous and stable power supply for low-power sensors.
[0021] (2) In the RF energy harvesting system designed in the present invention, the rectifier part adopts a high- and low-power dual-branch rectification structure and designs a power division network, so that the RF rectification circuit can switch between the two branches when operating at different power levels. This effectively solves the problem of limited power range of the RF rectification circuit under constant voltage load, making it suitable for wide power input scenarios.
[0022] (3) The present invention integrates the design of the radio frequency energy collection system and the vibration energy collection system. In addition to collecting electromagnetic waves in space, the dielectric resonator antenna of the radio frequency energy collection system is designed at the tip of the piezoelectric vibrator to adjust the resonant frequency of the vibration energy collection system, so that the vibration energy collection system can be better applied to work scenarios.
[0023] (4) Aiming at the application scenario of cross-sea bridges, the present invention fully utilizes the characteristics of radio frequency energy and vibration energy collection, and through the collaborative working mode of main energy and backup energy, radio frequency energy is used as the main energy and vibration energy is used as the backup energy to ensure the continuous and stable power supply of sensor nodes. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a structural block diagram of the radio frequency energy and vibration energy collaborative energy collector proposed in the present invention.
[0025] Figure 2 This is a schematic diagram of the structure of the antenna in the radio frequency energy and vibration energy collaborative energy collector proposed by the present invention.
[0026] Figure 3 This is a schematic diagram of the structure of the piezoelectric vibrator in the radio frequency energy and vibration energy cooperative energy collector proposed by the present invention.
[0027] Figure 4It is the open-circuit output voltage of the piezoelectric vibrator in the radio frequency energy and vibration energy synergistic energy harvester proposed by the present invention under different external excitation acceleration conditions.
[0028] Figure 5 The specific structural details of the radio frequency rectification circuit in the radio frequency energy and vibration energy synergistic energy collector proposed by the present invention.
[0029] Figure 6 The simulation and measured results of the return loss and conversion efficiency of the RF rectifier circuit in the RF energy and vibration energy synergistic energy harvester proposed in the present invention are shown in Figure 1 (the dotted line is the simulation data and the solid line is the measured data).
[0030] In the figure: 1 dielectric block layer, 2 first metal layer, 3 second metal layer, 4 substrate layer, 5 first piezoelectric layer, 6 second piezoelectric layer, 7 substrate layer. DETAILED DESCRIPTION
[0031] The specific implementation of the present invention is described in detail below in conjunction with the technical scheme and the accompanying drawings.
[0032] The structural block diagram of the high-efficiency wide-power RF energy harvester designed by the present invention is as follows: Figure 1 As shown, it includes a dielectric resonator antenna, an impedance matching network, a DC blocking capacitor, a rectifier I, a rectifier II, a low-pass filter, a piezoelectric vibrator, an AC-DC rectifier regulator, a power management circuit, and an energy storage device. The dielectric resonator antenna is responsible for receiving radio frequency energy in the environment, with an output impedance of 50Ω, and the back end is connected to an impedance matching network. The back end of the impedance matching network is connected to a DC blocking capacitor C1. Rectifier I and rectifier II are connected in parallel after the DC blocking capacitor. Rectifier I is a low-power rectifier branch, and rectifier II is a high-power rectifier branch. Rectifier I includes a low-pass filter I and a rectifier diode D1. The low-pass filter is connected in parallel with the low-power rectifier branch, and then the positive electrode of the rectifier diode D1 is connected, and the negative electrode of the rectifier diode D1 is grounded. Rectifier II includes a power division network, a low-pass filter II, and rectifier diodes D2 and D3. The power division network is connected in series with the high-power rectifier branch to adjust the power division ratio. The low-pass filter II is connected in parallel at the rear end. The low-pass filter II is connected to the positive electrode of the rectifier diode D2, the negative electrode of the rectifier diode is connected to the positive electrode of the rectifier diode 3, and the negative electrode of the rectifier diode D is grounded. The low-pass filter is connected after rectifier I and rectifier II, and the rear end is connected to the power management circuit to the energy storage device. The piezoelectric vibrator is connected to the rectifier regulator at the rear end and then connected to the second energy storage device II. The second energy storage device II is connected to the power management circuit, and finally connected to the first energy storage device I.
[0033] The antenna structure designed by the present invention is as follows Figure 2As shown, the dielectric resonator antenna includes a dielectric block layer 1, a first metal layer 2, a substrate layer 3, and a second metal layer 4. The dielectric block layer 1 is a cube located at the top layer of the antenna, and the dielectric constant of the material used is 65, and the dielectric loss is 0.0085. The first metal layer 2 is close to the bottom of the dielectric block layer 1, and the first metal layer 2 is a metal microstrip feeder, the front end is a 50Ω transmission line, and the rear end is a rectangle to excite the dielectric block. The substrate layer 3 is close to the bottom of the metal layer 2, and the lower layer of the substrate layer 3 is the second metal layer 4.
[0034] The rectifier circuit structure of the present invention is as follows: Figure 5 As shown, in the following discussion, TL represents microstrip line, W represents the width of the device, L represents the length of the device, H represents the height of the device, and the Arabic numerals following the letter symbols are serial numbers and will not be repeated. The impedance matching network part is composed of TL1, TL2, open branch node I and open branch node II. TL1 is connected to the beginning TL0 of this circuit, and its W=4mm, L=8.8mm. Open branch node I is connected in parallel with TL1, and its W=3.4mm, L=4.6mm. The rear end of TL1 is connected to TL2, and its W=4.4mm, L=3.8mm. Open branch node II is connected in parallel with TL2, and its W=2.2mm, L=8.5mm. The overall matching network part is formed.
[0035] The impedance matching network is connected to a DC blocking capacitor C1, the value of which is 100 pF and is packaged in C0603.
[0036] The blocking capacitor C1 is connected to the rectifier I in parallel. Rectifier I is a low-power rectifier branch, which is composed of TL8, TL9, TL10, TL11, open-circuit branch III, short-circuit branch I, GND1 and low-power diode D1. TL8 is connected in parallel with the blocking capacitor, and its W=1.1mm, L=2.8mm. The rear end is connected in parallel with the open-circuit branch III, and its W=1.1mm, L=7mm. The open-circuit branch III is also connected in parallel with TL9, and its W=1.1mm, L=2.8mm are used as connecting wires. The rear end is connected to the positive pole of the rectifier diode D1. The negative output pins of the low-power diode are connected to GND1 and TL10 respectively, and GND1's W=1.1mm, L=1.55mm. TL10's W=1.1mm, L=2mm. Its rear end is connected to TL11 as a 90°R=1.4mm arc. The rear end is connected to the short-circuit branch Ⅰ, whose W=1.1mm and L=10.6mm.
[0037] The rectifier II is connected in parallel with the DC blocking capacitor C1. Rectifier II is a high-power rectifier branch, which is composed of TL4, TL5, TL6, open-circuit branch IV, short-circuit branch II, GND2, GND2, the first high-power diode D2, and the second high-power D3. TL4 is connected in parallel with the DC blocking capacitor C1, and its W=1.1mm and L=5mm. The rear end is connected in parallel with the open-circuit branch III, and its W=1.1mm and L=7mm. The open-circuit branch III is also connected in parallel with TL9, and its W=1.1mm and L=2mm are used as connecting wires. The rear end is connected to the positive pole of the first high-power diode D2. The cathode output pins of the first high-power diode are connected to GND2 and TL6 respectively, and GND1 has W=1.1mm and L=1.55mm. TL6 has W=1.1mm, and the length is a right-angle corner of 2.6mm. Its rear end is connected to the second high-power diode D3. The rear end of the second high power diode D3 is connected to GND3 and the short circuit branch II, GND3 has W=1.1mm and L=1.55mm, and the short circuit branch II has W=1.1mm and L=15.6mm.
[0038] After the DC blocking capacitor is connected in parallel with rectifier I and rectifier II, it is connected to a low-pass filter, which is composed of TL12, fan-shaped open-circuit branch section I and TL13. After TL12 is connected to rectifier I and rectifier II, its W=1.1mm, L=3mm. The rear end is connected to the fan-shaped open-circuit branch section I, whose R=3.3mm, angle θ=30°, and the rear end is connected to TL13, whose W=1.1mm, L=2mm. The rear end is connected to the power management circuit.
[0039] In the present invention, the blocking capacitor C1, the low-power diode D1, the first high-power diode D2 and the second high-power diode D3 of the rectifier circuit are all welded on the microstrip line. The model of each of them is HSMS-2860, and the package model adopted is SOT-23.
[0040] The substrate used for circuit processing is Rogers RO4350B with a thickness of 0.508mm, a relative dielectric constant of 3.38, and a dielectric loss of 0.0027. The metal floor is located at the bottom of the dielectric substrate and its size is the same as that of the dielectric substrate.
[0041] The piezoelectric vibrator structure designed by the present invention is as follows Figure 3As shown, it includes a first piezoelectric layer 5, a second piezoelectric layer 6, and a substrate layer 7. The first piezoelectric layer 5 is located at the top of the piezoelectric vibrator, and its W=20mm, L=60mm, and H=0.2mm. The substrate layer 7 covers the lower layer of the first piezoelectric layer 5, and its W=20mm, L=120mm, and H=0.2mm. Then the second piezoelectric layer 6 is located below the substrate layer 5, and its W=20mm, L=60mm, and H=0.2mm. The materials used for the first piezoelectric layer 5 and the second piezoelectric layer 6 are both PZT-5H. The material used for the substrate layer 7 is metallic copper. The open-circuit output voltage of the piezoelectric vibrator under different external excitation accelerations is shown as follows. Figure 4 shown. Figure 4 It means that the optimal vibration frequency of the designed piezoelectric vibrator is 16Hz, and when the external excitation acceleration is 0.1g, 0.2g, 0.3g, 0.4g, and 0.5g, it has considerable open-circuit output voltage, which can start the rectifier regulator connected at the back end and successfully collect the vibration energy in a specific environment.
[0042] The rectifier and voltage stabilizer involved in the present invention has the functions of both rectification and voltage stabilization, converting the AC power output by the piezoelectric vibrator into a DC power supply, stabilizing the output voltage, and charging the second energy storage element II. The power management circuit is a DC-DC boost converter with an integrated constant voltage tracking function and has a power switching function. After connecting the RF energy rectifier circuit and the second energy storage device II of the vibration energy collection system, the RF energy is used as the main energy source and the vibration energy is used as the backup energy source to achieve seamless switching between the two energy sources.
[0043] Figure 6 The return loss of the RF rectifier circuit in the RF energy and vibration energy synergistic energy collector proposed by the present invention|S 11 | and the simulation and measured results of conversion efficiency. It can be seen that the simulated efficiency of the invented rectifier has a conversion efficiency of more than 50% in the input power range of -0.5-21dBm, and the measured efficiency has a conversion efficiency of more than 50% in the input power range of 2-20dBm. And the return loss at the corresponding efficiency is less than -10dB. It is sufficient to prove that the RF rectifier circuit proposed in the present invention can achieve high conversion efficiency in a high frequency of 2.45GHz and a wide power range.
[0044] The above examples are only for illustrating the technical concept and features of the present invention, and are only used for a specific description of the present invention so that people familiar with the technology can understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the content of the present invention should be included in the protection scope of the present invention.
Claims
1. A radio frequency energy and vibration energy collaborative energy harvesting system, characterized in that: The radio frequency energy and vibration energy collaborative energy collection system comprises four parts: a radio frequency energy collection system, a vibration energy collection system, a power management circuit and an energy storage device; The energy storage device comprises a first energy storage device I and a second energy storage device II; The radio frequency energy collection system comprises a dielectric resonator antenna, a radio frequency rectification circuit, a DC-DC boost converter and an energy storage device, wherein the dielectric resonator antenna receives radio frequency energy in the environment and is then connected to the radio frequency rectification circuit, the radio frequency rectification circuit is then connected to the DC-DC boost converter, and finally connected to the first energy storage device I; The vibration energy collection system comprises a piezoelectric vibrator, a rectifier and voltage regulator circuit and an energy storage device, wherein the piezoelectric vibrator senses the vibration energy in the environment and is connected to the rectifier and voltage regulator circuit, and the rectifier and voltage regulator circuit is connected to the second energy storage device II; The power management circuit will include a DC-DC boost converter. The energy storage device in the vibration energy system is connected to the RF DC-DC boost converter to integrate the RF energy and vibration energy, using RF energy as the main energy and vibration energy as the backup energy, and the two can be switched freely.
2. The radio frequency energy and vibration energy collaborative energy harvesting system according to claim 1, characterized in that: The radio frequency energy collection system is specifically as follows: The dielectric resonator antenna comprises a dielectric block layer (1), a first metal layer (2), a substrate layer (3), and a second metal layer (4); the first metal layer (2) is a long strip structure, the substrate layer (3) is a plate structure, and the second metal layer (4) has the same structure as the substrate layer (3); the first metal layer (2) is attached to the upper surface of the substrate layer (3), the second metal layer (4) is attached to the lower surface of the substrate layer (3), and the dielectric block layer (1) is arranged on the upper surface of the first metal layer (2); the dielectric block layer (1) is an antenna radiation device, the first metal layer (2) is used as antenna feed, the substrate layer (3) is a dielectric resonator antenna substrate, and the second metal layer (4) is ground.
3. The radio frequency energy and vibration energy collaborative energy harvesting system according to claim 2, characterized in that: The dielectric constant of the dielectric block layer (1) is 60; the material of the first metal layer (2) and the second metal layer (4) is metal copper.
4. The radio frequency energy and vibration energy collaborative energy harvesting system according to claim 1, characterized in that: The dielectric resonator antenna is connected to a radio frequency rectification circuit, the first energy storage device I is connected to a DC-DC boost converter, and the DC-DC boost converter is connected to a radio frequency rectification circuit.
5. The radio frequency energy and vibration energy collaborative energy harvesting system according to claim 1, characterized in that: The radio frequency rectification circuit comprises an impedance matching network, a DC blocking capacitor C1, a rectifier I, a rectifier II, and a low-pass filter; the output end of the impedance matching network is connected to the DC blocking capacitor C1, and then connected in parallel with the rectification branch I and the rectification branch II, and finally connected in series with the low-pass filter.
6. The radio frequency energy and vibration energy cooperative energy collection system according to claim 5, characterized in that: In the radio frequency rectification circuit: the impedance matching network is used to accurately match the input impedance of the radio frequency rectification circuit to 50Ω, which includes TL0, TL1, open branch node I, TL2, and open branch node II; a 50Ω SMA adapter is welded at the front end of TL0 to connect with the dielectric resonator antenna, and the rear end is connected to TL1; open branch node I is connected in parallel after TL1; TL2 is connected after open branch node I; TL2 is connected in parallel with open branch node II; and a DC blocking capacitor C1 is connected after open branch node II.
7. The radio frequency energy and vibration energy cooperative energy collection system according to claim 5, characterized in that: In the radio frequency rectification circuit: The rectifier I comprises a low-pass filter I and a low-power diode D1; the low-pass filter I is connected to the rear end of the DC blocking capacitor C1 and is connected to the positive electrode of the low-power diode D1, and the negative electrode of the low-power diode D1 is grounded; The rectifier II includes a power division network, a low-pass filter II, a first high-power diode D2, and a second high-power diode D3; the power division network is connected in parallel with the rear end of the DC blocking capacitor C1 and is connected to the low-pass filter II, the low-pass filter II is connected to the positive electrode of the first high-power diode D2, the negative electrode of the first high-power diode D2 is connected to the positive electrode of the second high-power diode D3, and the negative electrode of the second high-power diode D3 is grounded.
8. The radio frequency energy and vibration energy cooperative energy collection system according to claim 1, characterized in that: The vibration energy collection system is specifically as follows: the piezoelectric vibrator comprises a first piezoelectric layer (5), a second piezoelectric layer (6), a substrate layer (7), and a metal via (8); the first piezoelectric layer (5) and the second piezoelectric layer (6) are respectively covered on the upper and lower sides of the substrate layer (7) to construct a bimorph structure; the rear end of the piezoelectric vibrator is connected to a rectifying and voltage stabilizing circuit, the rectifying and voltage stabilizing circuit is connected to a second energy storage device II, and the second energy storage device II is connected to a power management circuit.
9. The radio frequency energy and vibration energy cooperative energy collection system according to claim 1, characterized in that: The power management circuit includes a DC-DC boost converter and has an energy switching function. When in normal working state, radio frequency energy is used as the main energy. When the main energy is insufficient, it switches to the backup energy to continue powering.
10. The radio frequency energy and vibration energy cooperative energy collection system according to claim 1, characterized in that: The dielectric resonator antenna is located at the tip of the piezoelectric vibrator in the entire energy collection system, that is, the second metal layer (4) covers the substrate layer (7).