Wireless power supply devices, vehicles

Abstract

This application relates to a wireless power supply device and vehicle, addressing the problems of limited battery life and environmental pollution associated with powering tire pressure sensors via chemical batteries in related technologies. The device includes an antenna, a radio frequency (RF) rectifier circuit, and an energy management circuit. The antenna is disposed on the surface of the wheel hub, which is obscured by the tire. The RF rectifier circuit and energy management circuit are disposed on the tire pressure sensor. The antenna is connected to the RF rectifier circuit, and the RF rectifier circuit is connected to the energy management circuit. The antenna transmits induced current to the RF rectifier circuit. The RF rectifier circuit converts the induced current into a stable DC voltage, which is then transmitted to the energy management circuit. The energy management circuit stores and manages the stable DC voltage, which is then transmitted to the tire pressure sensor for its use.

Description

Technical Field

[0001] This application relates to the field of wireless power supply technology for sensors, and in particular to a wireless power supply device and a vehicle. Background Technology

[0002] With the continuous development of the automotive industry, safe driving has become paramount. A significant proportion of serious traffic accidents today are caused by tire blowouts, primarily due to insufficient tire pressure. Therefore, tire pressure sensors have become an indispensable component of the vehicle's electrical system, used to monitor pressure changes in each tire in real time to promptly detect and address insufficient tire pressure. Currently, tire pressure sensors are mainly powered by chemical batteries; however, chemical batteries have limited lifespans and pollute the environment. Utility Model Content

[0003] Based on this, a wireless power supply device and vehicle are provided to solve the problems of limited lifespan of chemical batteries and environmental pollution associated with powering tire pressure sensors using chemical batteries in related technologies.

[0004] On one hand, a wireless power supply device is provided, comprising: an antenna, a radio frequency rectifier circuit, and an energy management circuit. The antenna is disposed on the surface of a wheel hub that is covered by a tire. The radio frequency rectifier circuit and the energy management circuit are disposed on a tire pressure sensor. The antenna is connected to the radio frequency rectifier circuit, and the radio frequency rectifier circuit is connected to the energy management circuit.

[0005] The antenna is used to transmit the induced current to the radio frequency rectifier circuit;

[0006] The radio frequency rectifier circuit is used to transmit the stable DC voltage converted from the induced current to the energy management circuit.

[0007] The energy management circuit is used to transmit the stored and managed stable DC voltage to the tire pressure sensor for use by the tire pressure sensor.

[0008] In some embodiments, the antenna is attached to the surface of the wheel hub that is covered by the tire by adhesive.

[0009] In some embodiments, the width of the antenna is at least two-thirds of the width of the wheel hub surface, and the length of the antenna is at least one-quarter of the circumference of the wheel hub.

[0010] In some embodiments, the antenna includes at least one radiating element, a feed line, a first coaxial connector, and a first ground plane, wherein the center pin of the first coaxial connector is connected to the feed line, and the outer shell of the first coaxial connector is connected to the first ground plane.

[0011] The at least one radiating element is used to resonate with radio frequency energy in space to generate the induced current, and to transmit the induced current to the first coaxial connector through the feeder.

[0012] The first coaxial connector is used to transmit the induced current to the radio frequency rectifier circuit.

[0013] In some embodiments, the radio frequency rectifier circuit and the energy management circuit are fixed to the tire pressure sensor by set screws.

[0014] In some embodiments, the RF rectifier circuit includes a second coaxial connector, a matching circuit, a rectifier circuit, a filter circuit, and a second ground plane; the center pin of the second coaxial connector is connected to the matching circuit, and the outer shell of the second coaxial connector is connected to the second ground plane; the matching circuit is connected to the rectifier circuit, and the rectifier circuit is also connected to the filter circuit;

[0015] The second coaxial connector is used to transmit the induced current transmitted by the first coaxial connector in the antenna to the matching circuit;

[0016] The matching circuit is used to transmit the matching current after impedance matching of the induced current to the rectifier circuit.

[0017] The rectifier circuit is used to transmit the DC voltage converted by the matching current to the filter circuit;

[0018] The filtering circuit is used to transmit the stable DC voltage after DC voltage harmonic suppression to the energy management circuit.

[0019] In some embodiments, the matching circuit, the rectifier circuit, and the filter circuit are connected via a first microstrip connection line.

[0020] In some embodiments, the center pin of the first coaxial connector is connected to the center pin of the second coaxial connector via an RF wire.

[0021] In some embodiments, the energy management circuit includes an energy management chip, a resistor divider, a capacitor, and a control circuit, wherein the energy management chip is connected to the resistor divider, the capacitor, and the control circuit, respectively.

[0022] The energy management chip is used to store the stable DC voltage in the capacitor and output a reference voltage to the resistor divider;

[0023] The resistor divider is used to transmit the output voltage determined by the reference voltage to the control circuit;

[0024] The control circuit is used to transmit the output voltage to the tire pressure sensor.

[0025] On the other hand, a vehicle is provided that includes the aforementioned wireless power supply device.

[0026] The aforementioned wireless power supply device converts the induced current acquired by the antenna into a stable DC voltage to supply the tire pressure sensor, achieving a sustainable power supply without polluting the environment. Simultaneously, the antenna is positioned on the wheel hub surface, which is shielded by the tire. The wheel hub surface provides mechanical support and a mounting base for the antenna, while the tire physically shields it from direct impact and pollution from the external environment. This not only ensures the reliability of the tire pressure sensor's power supply but also significantly reduces the power supply and maintenance costs of the tire pressure sensor. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a wireless power supply device provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of an antenna provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of an RF rectifier circuit provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram of a matching circuit provided in an embodiment of this application;

[0031] Figure 5 A schematic diagram of a rectifier circuit provided in an embodiment of this application;

[0032] Figure 6 A schematic diagram of a filter circuit provided in an embodiment of this application;

[0033] Figure 7 This is a schematic diagram of the structure of an energy management circuit provided in an embodiment of this application;

[0034] Figure 8 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0035] Reference numerals: 1. Antenna; 2. RF rectifier circuit; 3. Power management circuit; 4. RF wire; 5. Wire; 6. Wheel hub; 7. Tire pressure sensor; 1-1. Radiating element; 1-2. Feeder; 1-3. Dielectric substrate; 1-4. First coaxial connector; 1-5. First ground plane; 2-1. Second coaxial connector; 2-2. Matching circuit; 2-3. Rectifier circuit; 2-4. Filtering circuit; 2-5. Circuit dielectric substrate; 2-6. Second ground plane; 2-7. First microstrip connection line; 2-2- 1. First equivalent impedance; 2-2-2. Second equivalent impedance; 2-3-1. First surface mount capacitor; 2-3-2. Second surface mount capacitor; 2-3-3. Schottky diode; 2-4-1. Third equivalent impedance; 2-4-2. Fourth equivalent impedance; 2-4-3. Fifth equivalent impedance; 2-4-4. Sixth equivalent impedance; 2-4-5. Seventh equivalent impedance; 2-4-6. Eighth equivalent impedance; 3-1. Energy management chip; 3-2. Resistor voltage divider; 3-3. Capacitor; 3-4. Control circuit. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0039] The terms "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] With the continuous development of the automotive industry, safe driving has become paramount. A significant proportion of serious traffic accidents today are caused by tire blowouts, primarily due to insufficient tire pressure. Therefore, tire pressure sensors have become an indispensable component of the vehicle's electrical system, used to monitor pressure changes in each tire in real time to promptly detect and address insufficient tire pressure. Currently, tire pressure sensors are mainly powered by chemical batteries; however, chemical batteries have limited lifespans and pollute the environment.

[0041] Based on this, this application provides a wireless power supply device that converts the induced current obtained by the antenna into a stable DC voltage to supply the tire pressure sensor, achieving sustainable power supply to the tire pressure sensor without polluting the environment. Simultaneously, the antenna is positioned on the surface of the wheel hub, which is shielded by the tire. The wheel hub surface provides mechanical support and a mounting base for the antenna, while the tire physically shields it, protecting it from direct impact and pollution from the external environment. This not only ensures the reliability of the tire pressure sensor's power supply but also significantly reduces the power supply and maintenance costs of the tire pressure sensor.

[0042] Figure 1 The schematic diagram of a wireless power supply device provided in this application embodiment includes an antenna 1, a radio frequency rectifier circuit 2, and an energy management circuit 3. The antenna 1 is disposed on the surface of the wheel hub 6 which is covered by the tire, and the radio frequency rectifier circuit 2 and the energy management circuit 3 are disposed on the tire pressure sensor 7. The antenna 1 is connected to the radio frequency rectifier circuit 2, and the radio frequency rectifier circuit 2 is connected to the energy management circuit 3.

[0043] For example, antenna 1 is used to transmit induced current to radio frequency rectifier circuit 2;

[0044] RF rectifier circuit 2 is used to transmit the stable DC voltage converted from the induced current to the energy management circuit 3;

[0045] Energy management circuit 3 is used to transmit the stored and managed stable DC voltage to tire pressure sensor 7 for use by tire pressure sensor 7.

[0046] In some embodiments, the antenna 1 is attached to the surface of the wheel hub 6 that is covered by the tire by adhesive, so that the antenna 1 can be firmly and stably fixed without damaging the structure of the wheel hub 6.

[0047] Optionally, the antenna 1 is attached to the surface of the wheel hub 6 using the flexibility of polyethylene material. The curvature of the antenna 1 is consistent with the curvature of the wheel hub 6. Polyethylene material has good weather resistance, corrosion resistance and aging resistance, and can withstand harsh environmental conditions such as high temperature, low temperature, high humidity and vibration during vehicle operation.

[0048] In some embodiments, the width of antenna 1 is at least two-thirds of the surface width of hub 6, and the length of antenna 1 is at least one-quarter of the circumference of hub 6. A larger antenna 1 size means a greater energy harvesting capability, thereby ensuring the efficiency of radio frequency energy capture. In this embodiment, the operating frequency of antenna 1 is at least 5.8 GHz.

[0049] like Figure 1 As shown, the width of antenna 1 in the first direction is the width of antenna 1, and the length of antenna 1 in the second direction is the length of antenna 1.

[0050] In some embodiments, a structural schematic diagram of antenna 1 is provided, such as... Figure 2 As shown, there is a front view (a) that is not in direct contact with the surface of the hub 6, and a back view (b) that is in direct contact with the surface of the hub 6.

[0051] As shown in the front view a and the back view b, the antenna 1 includes at least one radiating element 1-1 (the number of radiating elements 1-1 can be 8, the specific number depends on the situation and is not limited here), a feed line 1-2, a dielectric substrate 1-3, a first coaxial connector 1-4, and a first ground plane 1-5.

[0052] in,

[0053] The positive and negative terminals of the first coaxial connector 1-4 are connected to the end of the feed line 1-2 and the first ground plane 1-5 respectively by soldering with a soldering iron; at least one radiating element 1-1, the feed line 1-2 and the first ground plane 1-5 are fixed on the dielectric substrate 1-3 by circuit board printing technology, and the dielectric substrate 1-3 is made of polyethylene; at least one radiating element 1-1 and the feed line 1-2 are directly connected by circuit board printing technology.

[0054] For example, at least one radiating element 1-1 is used to resonate with radio frequency energy in space to generate an induced current, and transmits the induced current to the first coaxial connector 1-4 through the feeder 1-2, wherein the radio frequency energy in space mainly comes from operator signal base stations and / or various communication devices (such as switches, routers, mobile phones, computers, etc.).

[0055] The first coaxial connector 1-4 is used to transmit the induced current to the radio frequency rectifier circuit 2.

[0056] The aforementioned device resonates with radio frequency energy in space to generate an induced current, which is then transmitted to the radio frequency rectifier circuit 2 via the first coaxial connector 1-4. Antenna 1 has few components and no moving parts, resulting in high reliability and resistance to external environmental factors. Furthermore, transmitting the induced current through the first coaxial connector 1-4 provides anti-interference capabilities, ensuring the stability of the induced current during transmission.

[0057] In some embodiments, the radio frequency rectifier circuit 2 and the energy management circuit 3 are fixed to the tire pressure sensor 7 by set screws, thereby ensuring that the radio frequency rectifier circuit 2 and the energy management circuit 3 will not loosen or fall off due to vibration, impact or temperature changes during vehicle operation.

[0058] like Figure 1 As shown, the RF rectifier circuit 2 and the energy management circuit 3 are also connected by a wire 5.

[0059] In some embodiments, a schematic diagram of the structure of an RF rectifier circuit 2 is provided, such as... Figure 3 As shown, the RF rectifier circuit 2 includes a second coaxial connector 2-1, a matching circuit 2-2, a rectifier circuit 2-3, a filter circuit 2-4, a circuit dielectric substrate 2-5, and a second ground plane 2-6. Among these,

[0060] The center pin of the second coaxial connector 2-1 is connected to the matching circuit 2-2, and the outer shell of the second coaxial connector 2-1 is connected to the second ground plane 2-6; the matching circuit 2-2 is connected to the rectifier circuit 2-3, and the rectifier circuit 2-3 is also connected to the filter circuit 2-4.

[0061] In addition, the matching circuit 2-2, the rectifier circuit 2-3 and the filter circuit 2-4 are fixed on the circuit dielectric substrate 2-5 by circuit board printing technology. The material of the circuit dielectric substrate 2-5 is epoxy board, such as FR-4.

[0062] For example, the second coaxial connector 2-1 is used to transmit the induced current transmitted by the first coaxial connector 1-4 in the antenna 1 to the matching circuit 2-2;

[0063] Matching circuit 2-2 is used to transmit the matched current after impedance matching of the induced current to rectifier circuit 2-3. Matching circuit 2-2 is a single-stub matching circuit, which is composed of the equivalent impedance replaced by the second microstrip connection line.

[0064] Figure 4 This is a schematic diagram of a matching circuit 2-2 provided in an embodiment of this application. Figure 4 As shown, the matching circuit 2-2 includes a first equivalent impedance 2-2-1 and a second equivalent impedance 2-2-2, which are directly connected by circuit board printing technology. The first equivalent impedance 2-2-1 and the second equivalent impedance 2-2-2 are replaced by second microstrip connecting lines with different lengths and widths, and have different impedance values ​​(determined by the length and width of the second microstrip connecting lines). The specific length and width of the second microstrip connecting lines are determined by the actual situation and are not limited here.

[0065] For example, when the induced current is transmitted to the matching circuit 2-2, the first equivalent impedance 2-2-1 and the second equivalent impedance 2-2-2 will shunt the induced current according to their impedance values. That is, the induced current will be distributed between the two equivalent impedances in a certain proportion. Part of the induced current is grounded through the first equivalent impedance 2-2-1; the other part of the induced current is transmitted to the rectifier circuit 2-3 through the second equivalent impedance 2-2-2. This shunt effect helps to adjust the distribution of the induced current in the circuit, so that the induced current can flow more evenly through the matching circuit 2-2, reducing reflection and energy loss.

[0066] Meanwhile, since the impedance values ​​of the first equivalent impedance 2-2-1 and the second equivalent impedance 2-2-2 are different, they will also have different effects on the phase of the induced current. Therefore, the induced current will undergo a phase change when passing through the first equivalent impedance 2-2-1 and the second equivalent impedance 2-2-2, thereby achieving fine adjustment of the phase of the induced current.

[0067] Through the combined action of the first equivalent impedance 2-2-1 and the second equivalent impedance 2-2-2, the induced current is shunted and its phase is adjusted to obtain a matching current. This matching current is then transmitted to the rectifier circuit 2-3, ensuring that the induced current can be transmitted to the rectifier circuit 2-3 to the maximum extent. This reduces energy reflection and loss caused by impedance mismatch and improves the efficiency and stability of induced current transmission.

[0068] The rectifier circuit 2-3 is used to transmit the DC voltage converted from the matching current to the filter circuit 2-4. The basic structure of the rectifier circuit 2-3 is a full-bridge rectifier circuit, which includes two capacitors of the same capacity and a diode device.

[0069] Figure 5 This is a schematic diagram of a rectifier circuit 2-3 provided in an embodiment of this application. Figure 5As shown, in the rectifier circuit 2-3, the two capacitors of the same capacitance are the first surface-mount capacitor 2-3-1 (capacity is 22pF, the specific value depends on the situation and is not limited here) and the second surface-mount capacitor 2-3-2 (capacity is 22pF, the specific value depends on the situation and is not limited here). The diode is a three-port Schottky diode 2-3-3.

[0070] The first surface mount capacitor 2-3-1 and the Schottky diode 2-3-3 are connected by a third microstrip connection line. The second surface mount capacitor 2-3-2 and the Schottky diode 2-3-3 are also connected by a third microstrip connection line. The first surface mount capacitor 2-3-1, the second surface mount capacitor 2-3-2, and the Schottky diode 2-3-3 are connected to the third microstrip connection line by soldering with a soldering iron. The specific length and width of the third microstrip connection line are determined by the actual situation and are not limited here.

[0071] For example, when the matching current is transmitted to the rectifier circuit 2-3, the matching current is first filtered and smoothed by the first surface-mount capacitor 2-3-1 to obtain a smoothed current.

[0072] Then, the smoothing current is rectified by the Schottky diode 2-3-3. For example, for the positive periodic portion of the smoothing current, after passing through the Schottky diode 2-3-3, a portion is transferred to the second surface-mount capacitor 2-3-2 to charge it, with the other end of the second surface-mount capacitor 2-3-2 grounded; the other portion is transferred to the filter circuit 2-4. For the negative periodic portion of the smoothing current, after passing through the Schottky diode 2-3-3, it is grounded. At this time, the second surface-mount capacitor 2-3-2 begins to discharge, and the discharge current is transferred to the filter circuit 2-4.

[0073] The matching current is rectified by the above device to obtain a DC voltage, so that the tire pressure sensor 7 can be powered according to the DC voltage.

[0074] The filter circuit 2-4 is used to transmit the stable DC voltage after DC voltage harmonic suppression to the energy management circuit 3. The filter circuit 2-4 is a low-pass filter circuit, which is composed of the equivalent impedance replaced by the fourth microstrip connection line.

[0075] Figure 6 This is a schematic diagram of a filter circuit 2-4 provided in an embodiment of this application. Figure 6As shown, the filter circuit 2-4 consists of the third equivalent impedance 2-4-1, the fourth equivalent impedance 2-4-2, the fifth equivalent impedance 2-4-3, the sixth equivalent impedance 2-4-4, the seventh equivalent impedance 2-4-5, and the eighth equivalent impedance 2-4-6. The equivalent impedances are replaced by fourth microstrip connecting lines with different lengths and widths, and have different impedance values ​​(determined by the length and width of the fourth microstrip connecting lines). They are directly connected through circuit board printing technology. The specific length and width of the fourth microstrip connecting lines are determined by the actual situation and are not limited here.

[0076] For example, when the DC voltage is transmitted to the filter circuit 2-4, it first flows into the third equivalent impedance 2-4-1 and the sixth equivalent impedance 2-4-4. The third equivalent impedance 2-4-1 and the sixth equivalent impedance 2-4-4 work together to form a resonant circuit. This circuit resonates at the fundamental frequency, thereby effectively reflecting the fundamental wave in the DC voltage and obtaining a DC voltage after fundamental wave suppression.

[0077] Then, the DC voltage after fundamental suppression flows into the combination of the fourth equivalent impedance 2-4-2 and the seventh equivalent impedance 2-4-5. This combination resonates at the first harmonic frequency, thereby effectively reflecting the first harmonic in the DC voltage after fundamental suppression, and obtaining the DC voltage after first harmonic suppression.

[0078] Finally, the DC voltage after first harmonic suppression flows into the combination of the fifth equivalent impedance 2-4-3 and the eighth equivalent impedance 2-4-6. This combination resonates at the second harmonic frequency, thereby effectively reflecting the second harmonic in the DC voltage after first harmonic suppression, obtaining a stable DC voltage, and transmitting the stable DC voltage to the energy management circuit 3.

[0079] The above-mentioned device can suppress nonlinear high-order harmonics in DC voltage, obtain stable DC voltage, and improve rectification efficiency.

[0080] In some embodiments, such as Figure 3 As shown, the matching circuit 2-2, the rectifier circuit 2-3 and the filter circuit 2-4 are connected by the first microstrip connection line 2-7. The first microstrip connection line 2-7 can improve the conversion efficiency of the circuit. The specific length and width of the first microstrip connection line 2-7 are determined by the actual situation and are not limited here.

[0081] In some embodiments, such as Figure 1 As shown, the center pin of the first coaxial connector 1-4 and the center pin of the second coaxial connector 2-1 are connected by the radio frequency wire 4, which realizes efficient and stable transmission of induced current. The radio frequency wire 4 has the characteristics of low loss and high impedance matching, which provides a strong guarantee for the transmission of induced current.

[0082] In some embodiments, a schematic diagram of the structure of an energy management circuit 3 is provided, such as... Figure 7 As shown, the energy management circuit 3 includes an energy management chip (BQ25504) 3-1, a resistor divider 3-2, a capacitor 3-3, and a control circuit 3-4. Among these,

[0083] Energy management chip 3-1 is a low-power energy harvesting chip and the core component of energy management circuit 3. Energy management chip 3-1 is connected to resistor divider 3-2, capacitor 3-3 and control circuit 3-4 respectively through copper wires printed by circuit board printing technology. Resistor divider 3-2 is the controller of the output voltage of energy management circuit 3, including three resistors R1, R2 and R3 connected in parallel. The output voltage of energy management circuit 3 can be determined by controlling the resistance values ​​of the three resistors. Capacitor 3-3 is a high power density, long cycle life, fast charging and green environmental protection supercapacitor. Control circuit 3-4 is also connected to the input and output of energy management circuit 3.

[0084] For example, when the stable DC voltage is transmitted to the energy management circuit 3, it reaches the control circuit 3-4 through the input of the energy management circuit 3, and is transmitted to the energy management chip 3-1 through the control circuit 3-4;

[0085] The energy management chip 3-1 is used to store a stable DC voltage in capacitor 3-3 and output a reference voltage V. BIAS To resistor divider 3-2;

[0086] Resistor voltage divider 3-2 is used to convert the reference voltage V BIAS The determined output voltage U is transmitted to the control circuit 3-4;

[0087] The method for determining the output voltage U is as follows:

[0088]

[0089] Control circuit 3-4 is used to transmit the output voltage U to the tire pressure sensor 7 via the output of energy management circuit 3.

[0090] The aforementioned device can store the acquired radio frequency energy and output a voltage according to the rated voltage of the tire pressure sensor 7, ensuring effective power supply to the tire pressure sensor 7 and enabling it to work normally.

[0091] This application also provides a vehicle; please refer to [link / reference]. Figure 8 , Figure 8 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Figure 8 As shown, the vehicle includes a wireless power supply device 801.

[0092] The wireless power supply device 801 includes an antenna, a radio frequency rectifier circuit, and an energy management circuit. The antenna is disposed on the surface of the wheel hub that is covered by the tire. The radio frequency rectifier circuit and the energy management circuit are disposed on the tire pressure sensor. The antenna is connected to the radio frequency rectifier circuit, and the radio frequency rectifier circuit is connected to the energy management circuit.

[0093] Antenna, used to transmit induced current to radio frequency rectifier circuit;

[0094] Radio frequency rectifier circuits are used to convert induced current into a stable DC voltage and transmit it to the energy management circuit.

[0095] The energy management circuit is used to transmit the stored and managed stable DC voltage to the tire pressure sensor for its use.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wireless power supply device, characterized in that, The device includes: an antenna, a radio frequency rectifier circuit, and an energy management circuit. The antenna is disposed on the surface of the wheel hub that is covered by the tire. The radio frequency rectifier circuit and the energy management circuit are disposed on the tire pressure sensor. The antenna is connected to the radio frequency rectifier circuit, and the radio frequency rectifier circuit is connected to the energy management circuit. The antenna is used to transmit the induced current to the radio frequency rectifier circuit; The radio frequency rectifier circuit is used to transmit the stable DC voltage converted from the induced current to the energy management circuit. The energy management circuit is used to transmit the stored and managed stable DC voltage to the tire pressure sensor for use by the tire pressure sensor.

2. The apparatus according to claim 1, characterized in that, The antenna is attached to the surface of the wheel hub that is covered by the tire by adhesive.

3. The apparatus according to claim 1, characterized in that, The width of the antenna is at least two-thirds of the width of the wheel hub surface, and the length of the antenna is at least one-quarter of the circumference of the wheel hub.

4. The apparatus according to claim 1, characterized in that, The antenna includes at least one radiating element, a feed line, a first coaxial connector, and a first ground plane. The center pin of the first coaxial connector is connected to the feed line, and the outer shell of the first coaxial connector is connected to the first ground plane. The at least one radiating element is used to resonate with radio frequency energy in space to generate the induced current, and to transmit the induced current to the first coaxial connector through the feeder. The first coaxial connector is used to transmit the induced current to the radio frequency rectifier circuit.

5. The apparatus according to claim 1, characterized in that, The radio frequency rectifier circuit and the energy management circuit are fixed to the tire pressure sensor by set screws.

6. The apparatus according to claim 1, characterized in that, The radio frequency rectifier circuit includes a second coaxial connector, a matching circuit, a rectifier circuit, a filter circuit, and a second ground plane; the center pin of the second coaxial connector is connected to the matching circuit, and the outer shell of the second coaxial connector is connected to the second ground plane; the matching circuit is connected to the rectifier circuit, and the rectifier circuit is also connected to the filter circuit; The second coaxial connector is used to transmit the induced current transmitted by the first coaxial connector in the antenna to the matching circuit; The matching circuit is used to transmit the matching current after impedance matching of the induced current to the rectifier circuit. The rectifier circuit is used to transmit the DC voltage converted by the matching current to the filter circuit; The filtering circuit is used to transmit the stable DC voltage after DC voltage harmonic suppression to the energy management circuit.

7. The apparatus according to claim 6, characterized in that, The matching circuit, the rectifier circuit, and the filter circuit are connected by a first microstrip connection line.

8. The apparatus according to claim 6, characterized in that, The center pin of the first coaxial connector is connected to the center pin of the second coaxial connector via an RF wire.

9. The apparatus according to claim 1, characterized in that, The energy management circuit includes an energy management chip, a resistor divider, a capacitor, and a control circuit. The energy management chip is connected to the resistor divider, the capacitor, and the control circuit, respectively. The energy management chip is used to store the stable DC voltage in the capacitor and output a reference voltage to the resistor divider; The resistor divider is used to transmit the output voltage determined by the reference voltage to the control circuit; The control circuit is used to transmit the output voltage to the tire pressure sensor.

10. A vehicle, characterized in that, The vehicle includes a wireless power supply device as described in any one of claims 1-9.

Images