Wireless sensing self-driven system based on dielectric elastomer

Abstract

The utility model discloses a wireless sensing self-driven system based on a dielectric elastomer, and belongs to the field of energy collection. Comprising a dielectric elastomer capacitor, a charge supply device, a self-bias voltage stabilizing circuit, a charging load, a sensor transmitting module, a sensor receiving module and a sensing data display device. The charge supply device provides initial charges for the dielectric elastomer capacitor, the dielectric elastomer capacitor deforms under the action of external force, and the capacitance of the dielectric elastomer capacitor changes, so that the voltage at the two ends of the dielectric elastomer capacitor changes, and the self-biased circuit is switched between series connection and parallel connection. The self-biased circuit is connected with the dielectric elastomer capacitor, so that the charge circularly flows between the dielectric elastomer capacitor and the self-biased circuit, the capacitor in the charging load is charged in the charge circulating process, then the capacitor supplies power to the sensor transmitting module, the sensor transmitting module transmits sensing data, the sensor receiving module receives the data, and the data is displayed on equipment. And wireless self-driven transmission of sensing data is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of energy collection, and in particular to a wireless sensing self-driving system. Background Art

[0002] The world has entered the era of the Internet of Things, where everything is connected. The perception layer of the Internet of Things relies on a large number of distributed sensors. Traditional sensors require external power supplies (batteries or wired power networks), and the battery life is short and needs to be replaced regularly. The wired power network wastes a lot of financial resources, which will limit its development. Self-driven sensor technology can provide power to sensors by collecting other forms of energy in the environment, so that batteries or wired power networks are not required. It is easy to install, has a long life, and saves costs. The development of self-driven wireless sensor technology has important application research significance. The dielectric elastomer generator based on variable capacitance has great advantages in collecting low-frequency mechanical energy. It can convert the widely distributed low-frequency mechanical energy in the environment into electrical energy to power sensor nodes, realizing the self-driving of sensors in the Internet of Things technology. Utility Model Content

[0003] In view of this, the purpose of the utility model is to overcome the problem that sensors in the perception layer of the Internet of Things require an external power supply, thereby providing a wireless sensing self-driving system and method that can efficiently convert low-frequency mechanical energy in the environment into electrical energy, thereby powering the sensors, realizing the sensing data in the environment without the need for an external power supply, and realizing self-driven transmission of data.

[0004] In order to achieve the above-mentioned objectives, the first objective of the utility model is to provide a wireless sensing self-driving system based on a dielectric elastomer, including: a dielectric elastomer capacitor, a charge supply device, a self-biased voltage stabilization circuit, a second rectifier bridge, a charging load, a sensor transmitting module, a sensor receiving module, and a sensor data display device.

[0005] The dielectric elastomer capacitor is a three-dimensional structure consisting of a stretchable dielectric elastomer, an inner flexible electrode, and an outer flexible electrode. The inner flexible electrode and the outer flexible electrode are respectively connected to a self-biased voltage stabilization circuit.

[0006] Preferably, the self-bias voltage-stabilizing circuit comprises a self-bias circuit and a voltage-stabilizing diode connected in parallel with the self-bias circuit. The self-bias circuit is composed of three internal diodes and two internal capacitors. The conduction and cutoff of the diodes can change the series and parallel structure of the capacitors in the self-bias circuit.

[0007] The two internal capacitors are connected, a first internal diode is connected in series between the two internal capacitors, a second internal diode is connected in parallel with the outside of the branch where the first internal diode is located, the cathode of the second internal diode is connected to the anode of the first internal diode, and a third internal diode is connected in parallel with the outside of the branch where the second internal capacitor is located, and the anode of the third internal diode is connected to the cathode of the first internal diode.

[0008] When the first internal diode is turned on, the second and third internal diodes are turned off, and the first internal capacitor and the second internal capacitor are connected in series. When the first internal diode is turned off, the second and third internal diodes are turned on, and the first internal capacitor and the second internal capacitor are connected in parallel.

[0009] Preferably, the charging load consisting of the rectifier and the capacitor is connected in series between the dielectric elastomer capacitor and the self-biased voltage stabilizing circuit for collecting electrical energy and supplying power to the sensor, and the self-biased voltage stabilizing circuit is connected in parallel on both sides of the charge supply device.

[0010] Preferably, the dielectric elastomer material is selected from acrylic elastomer, silicone rubber elastomer, and thermoplastic elastomer.

[0011] Preferably, the material of the outer flexible electrode and the inner flexible electrode is selected from one of conductive grease, ion conductor and hydrogel.

[0012] Preferably, the charge supply device is selected from one of an electret generator, a nano-friction generator, and a piezoelectric generator.

[0013] Preferably, the sensor transmitting module is connected in parallel with a charging load consisting of a rectifier bridge and a capacitor through a switch.

[0014] Preferably, the transmitted sensor data is selected from one of temperature, humidity and light data.

[0015] The second object of the utility model is to provide a wireless sensing self-driving system method, based on the above-mentioned wireless sensing self-driving system, the method comprises the following steps:

[0016] S 100 : Connect the charging load consisting of a rectifier bridge and a capacitor to the output end of the above system.

[0017] S 200 :The dielectric elastomer capacitor stretches and shrinks under the action of external force, causing the self-biased voltage stabilization circuit to switch between series and parallel. The charge circulates directly between the dielectric elastomer capacitor and the self-biased voltage stabilization circuit. During this period, the capacitor voltage increases.

[0018] S 300: When the thickness of the dielectric elastomer increases, the breakdown voltage of the dielectric elastomer increases, and the system output energy increases, but the initial capacitance value of the dielectric elastomer will decrease. When the thickness of the dielectric elastomer continues to increase to a certain extent, the system output energy decreases. When different dielectric elastomer materials are selected, the appropriate film thickness corresponds to a system maximum output power, which can improve the system's working efficiency.

[0019] S 400 :When the capacitor voltage rises to a certain value, the switch is closed to power the sensor transmitting module and transmit the sensing data.

[0020] S 500 : Use the sensor receiving module to receive data and display the sensor data on the sensor data display device.

[0021] Compared with the prior art, this utility model patent has the following beneficial effects:

[0022] When detecting environmental sensor data, no external power supply is required. Dielectric elastomers are used to collect low-frequency mechanical energy in the environment to achieve electromechanical conversion. The converted electrical energy is stored in commercial capacitors and used to power sensor nodes. Relevant data can be collected and transmitted, and long-distance wireless transmission of sensor data can be achieved. The installation is easy, durable and reliable, and an outdoor distributed wireless self-driving environmental detection system can be further constructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the dielectric elastomer capacitor being stretched and the charge flowing from the self-bias voltage stabilizing circuit to the dielectric elastomer capacitor in the embodiment of the utility model, and at this time, the capacitors in the self-bias voltage stabilizing circuit are in a parallel state.

[0024] Figure 2 This is a schematic diagram of the dielectric elastomer capacitor in the embodiment of the utility model shrinking and the charge flowing from the dielectric elastomer capacitor to the self-bias voltage stabilizing circuit. At this time, the capacitors in the self-bias voltage stabilizing circuit are in a series state.

[0025] Figure 3 This is a diagram showing the voltage variation of the third capacitor in an embodiment of the present utility model.

[0026] Figure 4 It is a schematic diagram of the changes in system voltage and current when the thickness of the dielectric elastomer is different in the embodiment of the utility model. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model discloses a system and method for realizing self-driven transmission of sensor data, such as Figure 1 As shown, it includes: 1- flexible electrode, 2- dielectric elastomer, 3- dielectric elastomer capacitor composed of flexible electrode and dielectric elastomer, 4-

[0029] The first rectifier bridge, 5-the third capacitor, 6-the charging load composed of the first rectifier bridge and the third capacitor, 7-the switch, 8-the sensor transmitting module, 9-the sensor receiving module, 10-the sensor data display device, 11-the charge supply device, 12-the second rectifier bridge, 13-the voltage regulator diode, 14-the third internal diode, 15-the second internal capacitor, 16-the first internal diode, 17-the first capacitor, 18-the second internal diode, 19-the self-bias voltage regulator circuit parallel state, 20-the self-bias voltage regulator circuit series state.

[0030] In this embodiment, the dielectric elastomer capacitor 3 is a sandwich structure consisting of a stretchable dielectric elastomer 2, an outer flexible electrode and an inner flexible electrode. The outer flexible electrode and the inner flexible electrode are respectively connected to a self-bias voltage stabilization circuit, and the self-bias voltage stabilization circuit is connected in parallel with a charge supply device. The charging load 6 is composed of a first rectifier bridge and a third capacitor. The charging load 6 is connected to the output end of the system, and the sensor transmitting module 8 is connected in parallel with the charging load 6 through a switch 7.

[0031] In this embodiment, the self-bias voltage stabilizing circuit includes a self-bias circuit and a voltage stabilizing diode 13 connected in parallel with the self-bias circuit. The self-bias circuit includes two internal capacitors and three internal diodes. The two internal capacitors are connected to each other, and a first internal diode is connected in series between the two internal capacitors. A second internal diode is connected in parallel outside the branch where the first internal capacitor and the first internal diode are located. A third internal diode is connected in parallel outside the branch where the second internal capacitor and the first internal diode are located.

[0032] When the first internal diode is turned on, the second internal diode and the third internal diode are turned off, and the self-bias circuit is in a series state. When the first internal diode is turned off, the second internal diode and the third internal diode are turned on, and the self-bias circuit is in a parallel state. The total amount of charge of the self-bias circuit increases during the series-parallel switching process.

[0033] In this embodiment, the charge supply device 11 provides initial charge for the dielectric elastomer capacitor 3 and the self-bias voltage stabilizing circuit. When the dielectric elastomer capacitor is stretched and deformed by external force, the voltage at both ends of the capacitor decreases and reaches a certain value, and the self-bias voltage stabilizing circuit changes to a parallel state, and the charge flows from the self-bias voltage stabilizing circuit to the dielectric elastomer capacitor. Conversely, when the dielectric elastomer capacitor is retracted and deformed, the voltage at both ends of the capacitor increases and reaches a certain value, and the self-bias voltage stabilizing circuit changes to a series state, and the charge flows from the dielectric elastomer capacitor to the self-bias voltage stabilizing circuit. During the series-parallel switching process of the self-bias voltage stabilizing circuit, the total amount of charge in the circuit increases. At the same time, when the system charge exceeds the threshold of the self-bias voltage stabilizing circuit, the excess charge will be released.

[0034] In this embodiment, the dielectric elastomer 2 in the dielectric elastomer capacitor 3 is selected from any one of acrylic elastomer, silicone rubber elastomer, and thermoplastic elastomer, the flexible electrode is selected from any one of conductive grease, ion conductor, and hydrogel, and the charge supply device is selected from any one of electret generator, nano friction generator, and piezoelectric generator.

[0035] In this embodiment, the first rectifier bridge 4 and the third capacitor 5 form a charging load 6, and the charging load 6 is connected to the output end of the system. Figure 3 Shown is a schematic diagram of the voltage change of the third capacitor 5 when storing the converted electric energy.

[0036] In this embodiment, changing the thickness of the dielectric elastomer 2 will affect the energy output of the system. Figure 4 It is a schematic diagram of the voltage and current changes of the system when the thickness of the dielectric elastomer 2 is different. When the thickness of the elastic dielectric elastomer material is different, the energy output value of the system is different.

[0037] The above-mentioned wireless sensing self-driving system and method based on dielectric elastomer are:

[0038] 1. The charge supply device 11 charges the self-bias voltage stabilization circuit and the dielectric elastomer capacitor through the second rectifier bridge 12 to provide an initial voltage, which is the system initial voltage.

[0039] 2. If Figure 1 As shown, when the dielectric elastomer capacitor 3 is subjected to external tension, it is stretched and deformed, the capacitance of the dielectric elastomer capacitor 3 increases, and the voltage across it decreases. When the voltage of the dielectric elastomer capacitor 3 is less than the voltage across the second internal capacitor 15 and the first capacitor 17 in the self-bias voltage stabilization circuit, the third internal diode 14 and the second internal diode 18 are turned on, the self-bias voltage stabilization circuit is in a parallel state, the dielectric elastomer capacitor continues to stretch, and the voltage across it continues to decrease. The charge flows from the self-bias voltage stabilization circuit to the dielectric elastomer capacitor under the voltage difference.

[0040] 3. Such as Figure 2As shown, when the external force on the dielectric elastomer capacitor 3 disappears, the dielectric elastomer capacitor 3 shrinks and deforms, the capacitance of the dielectric elastomer capacitor 3 decreases, and the voltage across it increases. When the voltage of the dielectric elastomer capacitor 3 is greater than the sum of the voltages across the second internal capacitor 15 and the first capacitor 17 in the self-bias voltage stabilization circuit, the first internal diode 16 is turned on, the self-bias voltage stabilization circuit is in a series state, the dielectric elastomer capacitor continues to shrink, and the voltage across it continues to increase, and the charge flows from the dielectric elastomer capacitor to the self-bias voltage stabilization circuit under the voltage difference.

[0041] 4. When the self-bias voltage stabilizing circuit switches between series and parallel, the total charge of the system increases. When the dielectric elastomer capacitor 3 returns to its initial state, the total voltage of the system increases. Repeating steps 2 and 3, the charge will circulate between the dielectric elastomer capacitor 3 and the self-bias voltage stabilizing circuit, and the total charge of the system will continue to increase. When the total charge exceeds the system threshold, it is released by the voltage stabilizing diode 13, and the system is in a voltage stabilizing state.

[0042] 5. As Figure 3 As shown, when the charge circulates between the dielectric elastomer capacitor 3 and the self-biased voltage stabilizing circuit, the current is output through the first rectifier bridge 4 to charge the third capacitor 5, and the voltage of the third capacitor 5 increases.

[0043] 6. Close the switch 7 and use the third capacitor 5 as the power source of the sensor transmitting module 8 to supply power to it and transmit the environmental sensing data.

[0044] 7. The sensor receiving module 9 receives the sensor data at a distance and displays the sensor data on the sensor data display device 10.

Claims

1. A wireless sensing self-driving system based on dielectric elastomer, characterized in that: include: Dielectric elastomer capacitor, charge supply device, self-bias voltage stabilization circuit, charging load, sensor transmitting module, sensor receiving module, sensor data display device; The dielectric elastomer capacitor is a sandwich structure consisting of a dielectric elastomer, an outer flexible electrode and an inner flexible electrode. The self-bias voltage stabilization circuit includes a self-bias circuit and a voltage stabilization diode connected in parallel with the self-bias circuit. The dielectric elastomer capacitor, the self-bias voltage stabilization circuit and the charge supply device are connected in parallel. The charging load composed of the first rectifier bridge and the third capacitor is connected to the output end of the system.

2. A wireless sensing self-driving system based on dielectric elastomer according to claim 1, characterized in that: The charge supply device provides initial charge for the dielectric elastomer capacitor and the self-bias voltage stabilizing circuit. The dielectric elastomer capacitor is deformed under the action of external force, causing its capacitance to change. When the dielectric elastomer capacitor is stretched to a certain extent, it is in a high capacitance and low voltage state. When it continues to be stretched, the voltage across the dielectric elastomer capacitor is lower than the voltage across the self-bias voltage stabilizing circuit. The charge flows from the self-bias voltage stabilizing circuit to the dielectric elastomer capacitor. The dielectric elastomer capacitor is stretched to the maximum deformation state and then retracts. When the dielectric elastomer capacitor retracts to a certain extent, it is in a low capacitance and high voltage state. The voltage across the dielectric elastomer capacitor is higher than the voltage across the self-bias voltage stabilizing circuit. The charge flows from the dielectric elastomer capacitor to the self-bias voltage stabilizing circuit. When the charge circulates between the dielectric elastomer capacitor and the self-bias voltage stabilizing circuit, the third capacitor in the charging load is charged. When the system voltage rises to the reverse breakdown voltage of the voltage stabilizing diode, the voltage stabilizing diode in the self-bias voltage stabilizing circuit is turned on, the system charge is released, and the system voltage is stabilized at a specific value.

3. The wireless sensing self-driving system based on dielectric elastomer according to claim 1, characterized in that: The sensor transmitting module is connected in parallel with the third capacitor in the charging load through a switch. When the voltage of the third capacitor rises to a certain value, the switch is closed to power the sensor transmitting module and transmit the sensing data.

4. The wireless sensing self-driving system based on dielectric elastomer according to claim 1, characterized in that: When the sensor transmitting module works to send the sensing data, the sensing data is received by the sensor receiving module at a remote location, and the relevant data is displayed on the sensing data display device.

5. The wireless sensing self-driving system based on dielectric elastomer according to claim 1, characterized in that: The sensor data transmitted is any one of temperature, humidity, and light.

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