A tire pressure sensor compatible with different frequency band matching networks

Abstract

The utility model discloses a kind of different frequency band matching network compatible tire pressure sensor, it includes: tire pressure sensor chip;Matching circuit, it includes Q1 triode, C14 capacitor and C15 capacitor, the first end of Q1 triode connects the IO2 pin of tire pressure sensor chip, the second end of Q1 triode is grounded, the third end of Q1 triode connects the first end of the C14 capacitor, the second end of the C14 capacitor connects one end of the C15 capacitor, the other end of the C15 capacitor is grounded, the second end of the C14 capacitor connects the RFOUT pin of tire pressure sensor chip.The utility model can solve the problem of solving tire pressure sensor using digital switch to compatible double frequency point, welding is not prone to poor and debugging inconvenient.

Description

Technical Field

[0001] This utility model relates to the field of tire pressure sensor technology, and in particular to a tire pressure sensor compatible with different frequency band matching networks. Background Technology

[0002] In the development of automotive tire pressure sensors, due to the frequency difference between the 433.92MHz and 315MHz bands, two different matching networks are often required to maximize power. However, the market often demands tire pressure sensors that are compatible with both frequency bands while maximizing power. But the available space in tire pressure sensors is too limited to simultaneously support two matching networks.

[0003] The existing method is to use digital switches to be compatible with dual frequencies (433.92 & 315MHz). However, digital switches are delicate and prone to poor soldering on PCB boards; they are expensive; and debugging is troublesome. Utility Model Content

[0004] The purpose of this invention is to provide a tire pressure sensor compatible with different frequency band matching networks in order to solve the problems of poor soldering and inconvenient debugging when using digital switches to be compatible with dual frequency points in tire pressure sensors.

[0005] To achieve the above objectives, this utility model provides a tire pressure sensor compatible with different frequency band matching networks, comprising:

[0006] Tire pressure sensor chip;

[0007] The matching circuit includes a Q1 transistor, a C14 capacitor, and a C15 capacitor. The first terminal of the Q1 transistor is connected to the IO2 pin of the tire pressure sensor chip, the second terminal of the Q1 transistor is grounded, the third terminal of the Q1 transistor is connected to the first terminal of the C14 capacitor, the second terminal of the C14 capacitor is connected to one terminal of the C15 capacitor, the other terminal of the C15 capacitor is grounded, and the second terminal of the C14 capacitor is connected to the RFOUT pin of the tire pressure sensor chip.

[0008] As a further description of the above technical solution:

[0009] The second end of capacitor C14 is connected to capacitor C17, and the other end of capacitor C17 is connected to capacitor C16.

[0010] As a further description of the above technical solution:

[0011] An L2 inductor is provided between the C14 capacitor and the RFOUT pin.

[0012] As a further description of the above technical solution:

[0013] An L1 inductor is provided between the L2 inductor and the RFOUT pin, and the other end of the L1 inductor is connected to AVDD.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: by using a transistor to design the matching circuit, the tire pressure sensor is simultaneously compatible with two frequency bands, and the power is maximized. The transistor packaging is simple and less prone to problems; the cost is low; the transistor's working principle is simple, and its application in the circuit is easy to debug. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a circuit diagram of a tire pressure sensor compatible with different frequency band matching networks.

[0017] Legend:

[0018] 1. Tire pressure sensor chip; 2. Matching circuit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "upper" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1 This utility model provides a tire pressure sensor compatible with different frequency band matching networks, including:

[0025] Tire pressure sensor chip 1;

[0026] Matching circuit 2 includes a transistor Q1, a capacitor C14, and a capacitor C15. The first end of the transistor Q1 is connected to the IO2 pin of the tire pressure sensor chip, the second end of the transistor Q1 is grounded, the third end of the transistor Q1 is connected to the first end of the capacitor C14, the second end of the capacitor C14 is connected to one end of the capacitor C15, the other end of the capacitor C15 is grounded, and the second end of the capacitor C14 is connected to the RFOUT pin of the tire pressure sensor chip.

[0027] The second end of capacitor C14 is connected to capacitor C17, and the other end of capacitor C17 is connected to capacitor C16.

[0028] An L2 inductor is provided between the C14 capacitor and the RFOUT pin.

[0029] An L1 inductor is provided between the L2 inductor and the RFOUT pin, and the other end of the L1 inductor is connected to AVDD.

[0030] A matching circuit is designed using transistors to enable the tire pressure sensor to operate on two frequency bands simultaneously, maximizing power output. Transistors are simple to package, less prone to problems, low in cost, and easy to debug in circuits due to their simple operating principle.

[0031] Working principle: When debugging the 315MHz band, IO2 is high, the transistor is on, and C14 is in the on state. Therefore, the factor affecting the matching network is the combined effect of capacitors C15 and C14. When debugging the 433.92MHz band, IO2 is low, the transistor is off, and C14 is in the off state. The factor affecting the matching network is capacitor C15. Therefore, the equivalent capacitance at the 315MHz frequency point is C15 × C14 / (C15 + C14), while the equivalent capacitance at the 434MHz frequency point is C15. This ensures that the equivalent capacitance at both frequency points is simultaneously adjusted to the optimal level, maximizing the sensor transmission distance and maintaining stable transmission.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tire pressure sensor compatible with different frequency band matching networks, characterized in that... ,include: Tire pressure sensor chip; The matching circuit includes a Q1 transistor, a C14 capacitor, and a C15 capacitor. The first terminal of the Q1 transistor is connected to the IO2 pin of the tire pressure sensor chip, the second terminal of the Q1 transistor is grounded, the third terminal of the Q1 transistor is connected to the first terminal of the C14 capacitor, the second terminal of the C14 capacitor is connected to one terminal of the C15 capacitor, the other terminal of the C15 capacitor is grounded, and the second terminal of the C14 capacitor is connected to the RFOUT pin of the tire pressure sensor chip.

2. A tire pressure sensor compatible with different frequency band matching networks according to claim 1, characterized in that... The second end of capacitor C14 is connected to capacitor C17, and the other end of capacitor C17 is connected to capacitor C16.

3. A tire pressure sensor compatible with different frequency band matching networks according to claim 1, characterized in that... An L2 inductor is provided between the C14 capacitor and the RFOUT pin.

4. A tire pressure sensor compatible with different frequency band matching networks according to claim 3, characterized in that... An L1 inductor is provided between the L2 inductor and the RFOUT pin, and the other end of the L1 inductor is connected to AVDD.

Images