A short-range communication circuit

Abstract

This utility model discloses a short-range communication circuit, belonging to the field of communication circuit technology. It includes a communication chip, a fourth inductor, a second antenna, and a first antenna mounting base. One antenna port of the communication chip is connected to the fourth inductor, which is connected to both the second antenna and the first antenna mounting base. The fourth inductor performs impedance matching for the antenna. A first antenna mounting base is pre-installed in the circuit, allowing for external connection of the first antenna if the second antenna is not compatible or does not meet installation requirements. This design satisfies diverse antenna installation needs at a lower cost, improving the applicability of the short-range communication circuit and its circuit board.

Description

Technical Field

[0001] This utility model relates to the field of communication circuit technology, specifically to a short-range communication circuit. Background Technology

[0002] Zigbee is a common short-range communication technology used for short-distance and low-data-rate applications. Short-range communication circuits are primarily used for data transmission between various electronic devices with short distances, low power consumption, and low transmission rates, as well as applications involving periodic, intermittent, and low-response-time data transmission. It is a commonly used technology in the Internet of Things (IoT).

[0003] Current short-range communication circuits typically use a single antenna for each chip. For example, CN217985425U discloses a smart home gateway that uses a single antenna for both Zigbee and Z-wave wireless communication protocols, allowing simultaneous connection of smart home devices using both protocols. However, when the antenna fails or its power is insufficient for the intended use case, it's necessary to replace it with a different model of short-range communication circuit; or even the entire gateway or electronic device. This results in excessively high configuration costs for short-range communication networks. Utility Model Content

[0004] In view of the above-mentioned technical problems existing in the prior art, this utility model provides a short-range communication circuit that facilitates antenna adjustment and maintains configuration cost.

[0005] This utility model discloses a short-range communication circuit, including a communication chip, a fourth inductor, a second antenna, and a first antenna mounting base; one antenna port of the communication chip is connected to the fourth inductor, and the fourth inductor is connected to the second antenna and the first antenna mounting base respectively.

[0006] Preferably, the second antenna is a printed antenna or an antenna pre-mounted on a circuit board; the first antenna mounting bracket is mounted on the circuit board.

[0007] Preferably, the first antenna mounting base includes an antenna end and at least one grounding end;

[0008] The antenna end is connected to the fourth inductor.

[0009] Preferably, a fifth inductor is provided between the fourth inductor and the first antenna mounting base, and the antenna end of the first antenna mounting base is grounded through a sixth capacitor.

[0010] Preferably, it also includes a fourth capacitor and a fifth capacitor;

[0011] One end of the fourth capacitor is connected to one end of the fourth inductor; the other end of the fourth capacitor is grounded.

[0012] One end of the fifth capacitor is connected to the other end of the fourth inductor; the other end of the fifth capacitor is grounded.

[0013] Preferably, the fourth inductor is connected to the second antenna through the sixth and seventh inductors;

[0014] The two ends of the seventh inductor are grounded through the seventh capacitor and the eighth capacitor, respectively.

[0015] Preferably, the communication chip model includes EFR32MG21 or TLSR8258F512ET32.

[0016] Preferably, the power supply is connected to the restart terminal of the communication chip through a first resistor, and the restart terminal is grounded through a first capacitor;

[0017] The power supply is connected to the antenna power supply terminal through the second inductor; the antenna power supply terminal is grounded through the second capacitor and the third capacitor respectively.

[0018] Preferably, the power supply is connected to the PAVDD terminal of the communication chip through the third inductor; the PAVDD terminal is grounded through the tenth capacitor and the eleventh capacitor respectively;

[0019] The DECOUPLE pin of the communication chip is grounded through the sixteenth capacitor;

[0020] The DVDD terminal of the communication chip is connected to the power supply; the DVDD terminal is grounded through the fourteenth and nineteenth capacitors.

[0021] The AVDD terminal of the communication chip is connected to the power supply through the first inductor; the AVDD terminal is grounded through the thirteenth capacitor and the eighteenth capacitor.

[0022] The IOVDD terminal of the communication chip is connected to the power supply, and the IOVDD terminal is grounded through the twelfth and seventeenth capacitors.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: impedance matching of the antenna is achieved through a fourth inductor; a first antenna mounting base is reserved on the circuit so that the first antenna can be connected externally when the second antenna cannot be adapted or meet the installation requirements; and diverse installation requirements of the antenna are met at a lower cost, thereby improving the applicability of short-range communication circuits and their circuit boards. Attached Figure Description

[0024] Figure 1 This is a circuit diagram of the short-range communication circuit of this utility model.

[0025] In the diagram, the following capacitors are labeled: Zig (communication chip); C1 (first capacitor); C2 (second capacitor); C3 (third capacitor); C4 (fourth capacitor); C5 (fifth capacitor); C6 (sixth capacitor); C7 (seventh capacitor); C8 (eighth capacitor); C10 (tenth capacitor); C11 (eleventh capacitor); C12 (twelfth capacitor); C13 (thirteenth capacitor); C14 (fourteenth capacitor); C16 (sixteenth capacitor); C17 (seventeenth capacitor); C18 (eighteenth capacitor); C19 (nineteenth capacitor).

[0026] ANT, antenna; E2, second antenna; E1, first antenna mounting bracket;

[0027] L1, first inductor; L2, second inductor; L3, third inductor; L4, fourth inductor; L5, fifth inductor; L6, sixth inductor; L7, seventh inductor;

[0028] R1, the first resistor; VDD3.3, the power supply. Detailed Implementation

[0029] 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, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings:

[0031] This utility model provides a short-range communication circuit, such as Figure 1 As shown, it includes a communication chip Zig, a fourth inductor L4, a second antenna E2, and a first antenna mounting base E1; one antenna port RF2G4_IO2 of the communication chip Zig is connected to the fourth inductor L4, and the fourth inductor L4 is connected to the second antenna E2 and the first antenna mounting base E1 respectively.

[0032] The antenna ANT is impedance matched by the fourth inductor L4; a first antenna mounting bracket E1 is reserved on the circuit so that the first antenna can be connected externally when the second antenna E2 cannot be adapted or meet the installation requirements; the diverse installation requirements of the antenna ANT are met at a lower cost, and the applicability of the short-range communication circuit and its circuit board is improved.

[0033] The second antenna E2 is a printed antenna or an antenna pre-mounted on a circuit board; the first antenna mounting bracket E1 is mounted on the circuit board. The first antenna mounting bracket E1 includes an antenna terminal ant and at least one ground terminal GND; the antenna terminal ant is connected to the fourth inductor L4. The external first antenna is detachably mounted on the first antenna mounting bracket E1.

[0034] Specifically, this utility model also includes a fourth capacitor C4 and a fifth capacitor C5; one end of the fourth capacitor C4 is connected to one end of the fourth inductor L4; the other end of the fourth capacitor C4 is grounded for impedance matching; one end of the fifth capacitor C5 is connected to the other end of the fourth inductor L4; the other end of the fifth capacitor C5 is grounded.

[0035] A fifth inductor L5 is provided between the fourth inductor L4 and the first antenna mounting base E1, and the antenna end of the first antenna mounting base E1 is grounded through the sixth capacitor C6.

[0036] The fourth inductor L4 is connected to the second antenna E2 through the sixth inductor L6 and the seventh inductor L7. The two ends of the seventh inductor L7 are grounded through the seventh capacitor C7 and the eighth capacitor C8, respectively, for impedance matching of the second antenna.

[0037] In one specific embodiment, the communication chip model used is EFR32MG21, but it is not limited to this; other communication chips such as TLSR8258F512ET32 can also be used. These communication chips have at least one antenna port.

[0038] Among them, the power supply VDD3.3 is connected to the reset terminal RESET of the communication chip Zig through the first resistor R1, and the reset terminal RESET is grounded through the first capacitor C1.

[0039] The power supply VDD3.3 is connected to the antenna power supply terminal RFVDD through the second inductor L2. The antenna power supply terminal RFVDD is grounded through the second capacitor C2 and the third capacitor C3.

[0040] The power supply VDD3.3 is connected to the PAVDD terminal of the communication chip Zig through the third inductor L3. The PAVDD terminal is grounded through the tenth capacitor C10 and the eleventh capacitor C11, respectively.

[0041] The DECOUPLE terminal of the communication chip Zig is grounded through the sixteenth capacitor C16.

[0042] The DVDD terminal of the communication chip Zig is connected to the power supply VDD3.3; the DVDD terminal is grounded through the fourteenth capacitor C14 and the nineteenth capacitor C19.

[0043] The AVDD terminal of the communication chip Zig is connected to the power supply VDD3.3 through the first inductor L1; the AVDD terminal is grounded through the thirteenth capacitor C13 and the eighteenth capacitor C18.

[0044] The IOVDD terminal of the communication chip Zig is connected to the power supply VDD3.3, and the IOVDD terminal is grounded through the twelfth capacitor C12 and the seventeenth capacitor C17.

[0045] The power supply VDD3.3 operates at 3.3V and can be supplied externally. Alternatively, a power supply module can be integrated into the circuit to provide VDD3.3. A metal contact can be placed on one side of the fourth inductor L4. With the external detection device's detection terminal connected to the metal contact and grounded, the antenna can be detected.

[0046] In this invention, the dual-antenna layout improves the applicability of short-range communication circuits at a low cost. The first antenna mounting bracket E1 can accommodate different types of antennas to suit the power requirements of the installation scenario. When installing the antenna on the first antenna mounting bracket E1, the second antenna E2 can be disconnected by removing the sixth inductor L6 or the seventh inductor L7. This invention provides impedance matching for the antenna ANT through the combination of capacitors and inductors; it also provides impedance matching for each power port of the communication port.

[0047] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A short-range communication circuit, characterized in that, This includes the communication chip, the fourth inductor, the second antenna, and the first antenna mounting bracket; One antenna port of the communication chip is connected to the fourth inductor, which is connected to the second antenna and the first antenna mounting base.

2. The short-range communication circuit according to claim 1, characterized in that, The second antenna is a printed antenna or an antenna pre-mounted on a circuit board; the first antenna mounting bracket is mounted on the circuit board.

3. The short-range communication circuit according to claim 1, characterized in that, The first antenna mounting base includes an antenna end and at least one grounding end; The antenna end is connected to the fourth inductor.

4. The short-range communication circuit according to claim 3, characterized in that, A fifth inductor is provided between the fourth inductor and the first antenna mounting base, and the antenna end of the first antenna mounting base is grounded through a sixth capacitor.

5. The short-range communication circuit according to claim 1, characterized in that, It also includes a fourth capacitor and a fifth capacitor; One end of the fourth capacitor is connected to one end of the fourth inductor; the other end of the fourth capacitor is grounded. One end of the fifth capacitor is connected to the other end of the fourth inductor; the other end of the fifth capacitor is grounded.

6. The short-range communication circuit according to claim 1, characterized in that, The fourth inductor is connected to the second antenna through the sixth and seventh inductors; The two ends of the seventh inductor are grounded through the seventh capacitor and the eighth capacitor, respectively.

7. The short-range communication circuit according to claim 1, characterized in that, The communication chip model includes EFR32MG21 or TLSR8258F512ET32.

8. The short-range communication circuit according to claim 7, characterized in that, The power supply is connected to the reset terminal of the communication chip through the first resistor, and the reset terminal is grounded through the first capacitor; The power supply is connected to the antenna power supply terminal through the second inductor; the antenna power supply terminal is grounded through the second capacitor and the third capacitor respectively.

9. The short-range communication circuit according to claim 7, characterized in that, The power supply is connected to the PAVDD terminal of the communication chip through the third inductor; the PAVDD terminal is grounded through the tenth capacitor and the eleventh capacitor respectively. The DECOUPLE pin of the communication chip is grounded through the sixteenth capacitor; The DVDD terminal of the communication chip is connected to the power supply; the DVDD terminal is grounded through the fourteenth and nineteenth capacitors. The AVDD terminal of the communication chip is connected to the power supply through the first inductor; the AVDD terminal is grounded through the thirteenth capacitor and the eighteenth capacitor. The IOVDD terminal of the communication chip is connected to the power supply, and the IOVDD terminal is grounded through the twelfth and seventeenth capacitors.

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