CN108879974A - A kind of wireless power supply system of automobile intelligent tire - Google Patents

Abstract

The invention discloses a wireless power supply system for automobile intelligent tires, which includes a DC power supply, an inverter, a primary coil, a secondary coil, a voltage stabilizing rectifier and an electronic module that are electrically connected in sequence, and the inverter includes an inverter working power supply circuit , the stabilized rectifier includes a stabilized rectifier power supply circuit; the wireless power supply system of the car smart tire provides a wireless power supply design for the electronic modules such as sensing and signal processing in the car smart tire, which saves the trouble of disassembling and assembling the battery. The power supply life of smart tires and the stability of monitoring are improved, and there is no need to worry about the power usage limit of the sensor. Real-time tire status detection, signal processing and wireless transmission can be carried out according to actual needs, so that the electronic modules of smart tires can work more stably. longer. It is beneficial to the dynamic balance of the tire and the driving is stable. Conducive to environmental protection and saving resources. Due to the wireless power supply design, the use of button batteries is reduced, which protects the environment and saves resources.

Description

A wireless power supply system for automobile smart tires

technical field

The invention relates to the field of automobile tire safety equipment, in particular to a wireless power supply system for automobile intelligent tires.

Background technique

Smart tires are the future development trend of the tire industry. Installing electronic modules such as sensors and signal processing inside tires is an important means to realize tire intelligence. However, how to provide continuous and reliable power supply for the above-mentioned electronic modules is a problem that must be solved.

At present, direct power supply using button batteries is the most mainstream way. The size of the button battery is small, although it can meet the space constraints in the tire, but the capacity of the button battery is generally not very large, about 500mAh to 1000mAh. This limits its service life. Usually, the lifespan of the button battery that supplies power to the sensor is about 3 years, and it is difficult to provide the full-life power demand for the smart tire. However, if a battery with a larger size and battery capacity is used, on the one hand, it will cause certain difficulties in the installation and use of the tire, and on the other hand, it will also cause certain potential safety hazards.

For example, the harsh working environment inside the tire also poses a challenge to this direct power supply method. When the car is running, the temperature inside the tire can reach 100°C or even higher, and the air pressure can reach 500kPa. Under the condition of high temperature and high pressure, the service life of the battery will be greatly reduced, and even deformation and burst will occur, which will cause serious safety hazards to the driving of the car.

In addition, due to the weight of the battery, if a battery with a larger size and capacity is used, the dynamic balance of the tire will also be affected. The sensors and batteries installed inside the tire are actually fixed on the inner surface of the tire and are part of the smart tire itself, so the density of the smart tire is not uniform on the entire circumference. If the whole device is too heavy, the corresponding balance weight on the tire is also very heavy. Sometimes this kind of balance weight cannot be found, so the smaller the quality of the sensor and battery part, the better. The weight of the sensor element itself is very small, and most of the weight is They are all concentrated on the battery. Therefore, in order to ensure the dynamic balance of the smart tire, the most important way is to reduce the weight of the battery or use an indirect power supply mode.

In-wheel sensors that are directly powered by batteries will also have a great impact on signal acquisition. Because the traffic accidents caused by the abnormality of automobile tires are often instantaneous, real-time monitoring is a basic requirement for smart tires. However, if the transmission frequency is too high and the sampling time is too frequent, the power consumption will be huge and the battery life cannot be guaranteed. If in order to prolong battery life, it is necessary to limit the number of detections and launches. Although the service life is improved, its monitoring effect has not been brought into play, and real-time monitoring cannot be guaranteed. Therefore, in order to meet the requirements of smart tires, it is necessary to design a new power supply method for the in-tire sensing device.

Contents of the invention

The purpose of the present invention is to provide a wireless power supply system for automobile intelligent tires, which is used to solve the problem of deficiencies in the prior art.

In order to achieve the above object, the technical solution adopted in the present invention is: a wireless power supply system for automobile smart tires, including a DC power supply, an inverter, a primary coil, a secondary coil, a voltage stabilizing rectifier and an electronic module that are electrically connected in sequence, The DC power supply is electrically connected to the input end of the inverter, and the primary coil is electrically connected to the output end of the inverter;

The inverter includes an inverter working power circuit, and the inverter working power circuit includes a first integrated circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor , a seventh resistor, an adjustable resistor, a first capacitor, a second capacitor, a first field effect transistor, a second field effect transistor and a first transformer, the model of the first integrated circuit is SG3524, and the first integrated circuit The eighth terminal, the fourth terminal and the fifth terminal of the first integrated circuit are all grounded, the seventh terminal of the first integrated circuit is grounded through the first capacitor, the sixth terminal of the first integrated circuit is grounded through the first resistor, and the The second terminal of the first integrated circuit is grounded through the second resistor, the first terminal of the first integrated circuit is grounded through the third resistor, and the ninth terminal of the first integrated circuit is connected to the adjustable resistor and the second capacitor respectively. , the eleventh end of the first integrated circuit is connected to the gate of the second field effect transistor, the twelfth end of the first integrated circuit is connected to the thirteenth end of the first integrated circuit, and the first The twelfth terminal of the integrated circuit is respectively connected to the second capacitor and the adjustable resistor through a series circuit composed of the sixth resistor and the seventh resistor, and the fourteenth terminal of the first integrated circuit is connected to the gate of the first field effect transistor connection, the fifteenth end of the first integrated circuit is externally connected to a 12V DC voltage power supply through a switch, the sixteenth end of the first integrated circuit is connected to the second end of the first integrated circuit through a fourth resistor, and the first The first end of an integrated circuit is grounded through a series circuit composed of a fifth resistor, a second capacitor and an adjustable resistor, the adjustable end of the adjustable resistor is grounded, and the drain of the first field effect transistor and the second field effect transistor The drains of the effect tubes are all grounded, the source of the first FET is connected to the source of the second FET through the primary side of the first transformer, and the center point of the primary side of the first transformer is externally connected to 12V DC voltage supply;

The stabilized rectifier includes a stabilized rectifier power supply circuit, the stabilized rectified power supply circuit includes a second transformer, a rectifier bridge, a second integrated circuit, a fifth capacitor, a sixth capacitor, a third capacitor and a fourth capacitor, the The model of the second integrated circuit is LM309, the input end of the rectifier bridge is connected with the secondary side of the second transformer, the positive pole of the output end of the rectifier bridge is connected with the first end of the second integrated circuit, the rectifier bridge The negative electrode of the output terminal is grounded, the first terminal of the second integrated circuit is grounded respectively through the fifth capacitor and the sixth capacitor, the ground terminal of the second integrated circuit is grounded, and the third terminal of the second integrated circuit is respectively connected to the ground through the fifth capacitor and the sixth capacitor. The third capacitor and the fourth capacitor are grounded.

Preferably, the DC power supply voltage is 12V or 24V.

Preferably, in order to increase the output power of the primary coil, the DC power supply is electrically connected to a boost module.

Preferably, in order to reduce resistance, both the primary coil and the secondary coil are alloy materials.

Preferably, the inverter is a high frequency inverter.

Preferably, the electronic module includes a sensor and a controller.

The beneficial effect of the present invention is that the wireless power supply system of the smart car tire is reasonably designed, and provides a wireless power supply design for electronic modules such as sensing and signal processing in the smart car tire, which saves the trouble of disassembling and assembling the battery and improves The power supply life and monitoring stability of smart tires are improved. Compared with the direct power supply sensor, there is no need to worry about the power usage limit of the sensor, and real-time tire status detection, signal processing and wireless transmission can be performed according to actual needs, so that the electronic module of the smart tire works more stably and works longer. The design of wireless power supply reduces the weight of the battery, and the volume and weight of the entire detection transmitter placed in the tire can be made very small, which is conducive to the dynamic balance of the tire and smooth driving. Conducive to environmental protection and saving resources. Due to the wireless power supply design, the use of button batteries is reduced, which protects the environment and saves resources.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of the wireless power supply system for automobile smart tires of the present invention.

Fig. 2 is a system schematic diagram of the wireless power supply system for automobile smart tires of the present invention.

Fig. 3 is a schematic circuit diagram of the inverter working power supply circuit of the wireless power supply system for automobile smart tires of the present invention.

Fig. 4 is a schematic circuit diagram of the voltage stabilizing and rectifying power supply circuit of the wireless power supply system for automobile smart tires of the present invention.

In the figure: 1. DC power supply, 2. Inverter, 3. Primary coil, 4. Secondary coil, 5. Regulator rectifier, 6. Electronic module.

Detailed ways

The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figures 1 to 4, a wireless power supply system for automobile smart tires includes a DC power supply 1, an inverter 2, a primary coil 3, a secondary coil 4, a stabilized rectifier 5 and an electronic module 6 that are electrically connected in sequence , the DC power supply 1 is electrically connected to the input end of the inverter 2, and the primary coil 3 is electrically connected to the output end of the inverter 2;

The inverter 2 includes an inverter working power circuit, and the inverter working power circuit includes a first integrated circuit U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first Fifth resistor R5, sixth resistor R6, seventh resistor R7, adjustable resistor RP1, first capacitor C1, second capacitor C2, first field effect transistor Q1, second field effect transistor Q2 and first transformer T1, the The model of the first integrated circuit U1 is SG3524, the eighth terminal, the fourth terminal and the fifth terminal of the first integrated circuit U1 are all grounded, the seventh terminal of the first integrated circuit U1 is grounded through the first capacitor C1, The sixth end of the first integrated circuit U1 is grounded through the first resistor R1, the second end of the first integrated circuit U1 is grounded through the second resistor R2, and the first end of the first integrated circuit U1 is grounded through the first resistor R2. The three resistors R3 are grounded, the ninth end of the first integrated circuit U1 is respectively connected to the adjustable resistor RP1 and the second capacitor C2, the eleventh end of the first integrated circuit U1 is connected to the gate of the second field effect transistor Q2 The twelfth end of the first integrated circuit U1 is connected to the thirteenth end of the first integrated circuit U1, and the twelfth end of the first integrated circuit U1 passes through the sixth resistor R6 and the seventh resistor R7 The composed series circuit is respectively connected to the second capacitor C2 and the adjustable resistor RP1, the fourteenth terminal of the first integrated circuit U1 is connected to the gate of the first field effect transistor Q1, and the first terminal of the first integrated circuit U1 The fifteenth terminal is externally connected to a 12V DC voltage power supply through a switch, the sixteenth terminal of the first integrated circuit U1 is connected to the second terminal of the first integrated circuit U1 through a fourth resistor R4, and the first terminal of the first integrated circuit U1 The terminal is grounded through the series circuit composed of the fifth resistor R5, the second capacitor C2 and the adjustable resistor RP1, the adjustable terminal of the adjustable resistor RP1 is grounded, the drain of the first field effect transistor Q1 and the second field effect transistor Q1 The drains of the transistors Q2 are all grounded, the source of the first field effect transistor Q1 is connected to the source of the second field effect transistor Q2 through the primary side of the first transformer T1, and the center of the primary side of the first transformer T1 Point external 12V DC voltage power supply;

The stabilized rectifier includes a stabilized and rectified power supply circuit, and the stabilized and rectified power supply circuit includes a second transformer T2, a rectifier bridge N1, a second integrated circuit U2, a fifth capacitor C5, a sixth capacitor C6, a third capacitor C3 and The fourth capacitor C4, the model of the second integrated circuit U2 is LM309, the input end of the rectifier bridge N1 is connected to the secondary side of the second transformer T2, and the positive pole of the output end of the rectifier bridge N1 is connected to the second integrated circuit The first end of U2 is connected, the negative electrode of the output end of the rectifier bridge N1 is grounded, the first end of the second integrated circuit U2 is grounded through the fifth capacitor C5 and the sixth capacitor C6 respectively, and the second integrated circuit U2 The ground terminal is grounded, and the third terminal of the second integrated circuit U2 is grounded through the third capacitor C3 and the fourth capacitor C4 respectively.

Preferably, the DC power supply voltage is 12V or 24V.

Preferably, in order to increase the output power of the primary coil 3, the DC power supply 1 is electrically connected with a boost module.

Preferably, in order to reduce resistance, both the primary coil 3 and the secondary coil 4 are alloy materials.

Preferably, the inverter 2 is a high frequency inverter.

Preferably, the electronic module 6 includes a sensor and a controller.

When in use, the inverter 2 and the primary coil 3 are installed on the wheel arch of the automobile and are fixed, while the secondary coil 4, the voltage stabilizing rectifier 5 and the electronic module 6 are installed in the tire crown airtight layer of the automobile tire, With the tread movement.

The DC power supply 1 can be a storage battery of a car, and when the size of the tire is large, a booster module can be used to increase the voltage.

The working principle is: the inverter 2 converts direct current into high-frequency alternating current and outputs it to the primary coil 3, thereby generating a changing magnetic field in the entire tire area. As the wheel rotates, the secondary coil 4 receives electromagnetic induction and outputs a voltage. The voltage rectifier 5 becomes a stable direct current to supply power to the electronic module 6 .

The primary coil 3 is made of an alloy material with low resistance, and is fixed above the inner side of the wheel arch of the car. The changing magnetic field area generated by it must be able to cover the three-dimensional geometry of the entire tire. In order to avoid the magnetic field from affecting the electronic equipment in the car, the car wheel The arch is preferably made of electromagnetic shielding material.

The working principle of the working power supply circuit of the inverter: the first integrated circuit U1 controls the on-off of the first field effect transistor Q1 and the second field effect transistor Q2 to realize the on-off of the power supply on the primary side of the first transformer T1, thereby Coupled to the secondary side of the first transformer T1, the AC signal is output to realize the inversion of the power supply. In this circuit, the standby current of the first integrated circuit U1 is 8mA, thereby greatly reducing the power consumption of the working power supply circuit and improving its practical value.

The working principle of the stabilized and rectified power supply circuit: After the power supply voltage is stepped down by the second transformer T2, it is rectified and output by the rectifier bridge N1, and then filtered by the fifth capacitor C5 and the sixth capacitor C6, and then enters the second integrated circuit U2 internally performs voltage stabilization output, and finally outputs from the second integrated circuit U2, and at the same time filters the output by the third capacitor C3 and the fourth capacitor C4, thereby realizing a stable and reliable output of the power supply voltage. In this circuit, the model of the second integrated circuit U2 is LM309, which has a thermal protection function inside, so that when the internal consumption of the second integrated circuit U2 is too large, the second integrated circuit U2 will automatically shut down, thereby realizing the automatic power supply circuit. The protection function improves the reliability of the working power supply circuit.

Compared with the existing technology, the wireless power supply system of the automobile smart tire is reasonably designed, and provides a wireless power supply design for the electronic modules such as sensing and signal processing in the automobile smart tire, which saves the trouble of disassembling and assembling the battery and improves The power supply life and monitoring stability of smart tires are improved. Compared with the direct power supply sensor, there is no need to worry about the power usage limit of the sensor, and real-time tire status detection, signal processing and wireless transmission can be performed according to actual needs, so that the electronic module of the smart tire works more stably and works longer. The design of wireless power supply reduces the weight of the battery, and the volume and weight of the entire detection transmitter placed in the tire can be made very small, which is conducive to the dynamic balance of the tire and smooth driving. Conducive to environmental protection and saving resources. Due to the wireless power supply design, the use of button batteries is reduced, which protects the environment and saves resources.

Although the present invention has been described in detail above with general descriptions and specific examples, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (6)

1. A wireless power supply system for automobile smart tires, the wireless power supply system includes a DC power supply, an inverter, a primary coil, a secondary coil, a voltage stabilizing rectifier and an electronic module that are electrically connected in sequence, wherein the DC The power supply is electrically connected to the input end of the inverter, and the primary coil is electrically connected to the output end of the inverter; The inverter includes an inverter working power circuit, and the inverter working power circuit includes a first integrated circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor , a seventh resistor, an adjustable resistor, a first capacitor, a second capacitor, a first field effect transistor, a second field effect transistor and a first transformer, the model of the first integrated circuit is SG3524, and the first integrated circuit The eighth terminal, the fourth terminal and the fifth terminal of the first integrated circuit are all grounded, the seventh terminal of the first integrated circuit is grounded through the first capacitor, the sixth terminal of the first integrated circuit is grounded through the first resistor, and the The second terminal of the first integrated circuit is grounded through the second resistor, the first terminal of the first integrated circuit is grounded through the third resistor, and the ninth terminal of the first integrated circuit is connected to the adjustable resistor and the second capacitor respectively. , the eleventh end of the first integrated circuit is connected to the gate of the second field effect transistor, the twelfth end of the first integrated circuit is connected to the thirteenth end of the first integrated circuit, and the first The twelfth terminal of the integrated circuit is respectively connected to the second capacitor and the adjustable resistor through a series circuit composed of the sixth resistor and the seventh resistor, and the fourteenth terminal of the first integrated circuit is connected to the gate of the first field effect transistor connection, the fifteenth end of the first integrated circuit is externally connected to a 12V DC voltage power supply through a switch, the sixteenth end of the first integrated circuit is connected to the second end of the first integrated circuit through a fourth resistor, and the first The first end of an integrated circuit is grounded through a series circuit composed of a fifth resistor, a second capacitor and an adjustable resistor, the adjustable end of the adjustable resistor is grounded, and the drain of the first field effect transistor and the second field effect transistor The drains of the effect tubes are all grounded, the source of the first FET is connected to the source of the second FET through the primary side of the first transformer, and the center point of the primary side of the first transformer is externally connected to 12V DC voltage supply; The stabilized rectifier includes a stabilized rectifier power supply circuit, the stabilized rectified power supply circuit includes a second transformer, a rectifier bridge, a second integrated circuit, a fifth capacitor, a sixth capacitor, a third capacitor and a fourth capacitor, the The model of the second integrated circuit is LM309, the input end of the rectifier bridge is connected with the secondary side of the second transformer, the positive pole of the output end of the rectifier bridge is connected with the first end of the second integrated circuit, the rectifier bridge The negative electrode of the output terminal is grounded, the first terminal of the second integrated circuit is grounded respectively through the fifth capacitor and the sixth capacitor, the ground terminal of the second integrated circuit is grounded, and the third terminal of the second integrated circuit is respectively connected to the ground through the fifth capacitor and the sixth capacitor. The third capacitor and the fourth capacitor are grounded. 2. The wireless power supply system for automobile smart tires according to claim 1, wherein the DC power supply voltage is 12V or 24V. 3. The wireless power supply system for automobile smart tires according to claim 1, wherein the DC power supply is electrically connected to a boost module. 4. The wireless power supply system for automobile smart tires according to claim 1, characterized in that, both the primary coil and the secondary coil are alloy materials. 5. The wireless power supply system for automobile smart tires according to claim 1, wherein the inverter is a high-frequency inverter. 6. The wireless power supply system for automobile smart tires according to claim 1, wherein the electronic module includes a sensor and a controller.