Bluetooth circuit capable of optimizing interference function

Abstract

The utility model particularly relates to a Bluetooth circuit with an interference optimizing function, which comprises a Bluetooth chip U1 and an antenna ATNT1 which are connected with each other, and is characterized in that a signal anti-interference circuit is arranged between the Bluetooth chip U1 and the antenna ATNT1 and comprises a first chip inductor L1, a second chip capacitor C2 and a first resistor R1, the first chip inductor L1 and the second chip capacitor C2 are connected in parallel, one side of the first chip inductor L1 and one side of the second chip capacitor C2 are connected with a first resistor R1, the antenna ATNT1 is connected to a common end between the second chip capacitor C2 and the first resistor R1, and the two ends of the first chip inductor L1 are connected to a pin 15 and a pin 16 of the Bluetooth chip U1 respectively. The signal anti-interference circuit has the beneficial effects that the interference is filtered by utilizing the characteristic that the first chip inductor L1 and the second chip capacitor C2 in the signal anti-interference circuit can be combined to filter interference, so that the signal interference of the antenna ANT1 is reduced to the minimum, and the signal strength is increased.

Description

Technical Field

[0001] The utility model specifically relates to a Bluetooth circuit with optimized interference function. Background Art

[0002] Bluetooth is a common indoor communication network. A Bluetooth gateway is a data forwarding device that is usually used to communicate with Bluetooth devices and can realize communication between Bluetooth devices and servers. In order to facilitate the management of indoor Bluetooth devices or to use the collected Bluetooth signals to realize indoor positioning and other functions, a Bluetooth gateway is usually required.

[0003] For example, a document entitled: A Bluetooth gateway with multi-level anti-interference components, with application number: CN202111518429.6, is disclosed. The circuit is: a terminal, an anti-interference module and a transmission module. The anti-interference module includes a plurality of capacitor modules, and the capacitor module includes a plurality of capacitors. The positive electrode of the high voltage pole is grounded through one group of capacitors, and the negative electrode of the high voltage pole is grounded through another group of capacitors, and another group of capacitors is electrically connected between the positive electrode of the high voltage pole and the negative electrode of the high voltage pole; the transmission module includes a carrier, on which a USB to serial port circuit, a Bluetooth antenna, and a USB to serial port circuit are respectively arranged. The circuit is connected to a USB connector, and a Bluetooth module is built in the carrier, wherein the Bluetooth module is electrically or signal-connected to the USB-to-serial port circuit and the Bluetooth antenna respectively, and the Bluetooth module sends the received data through the Bluetooth antenna; the Bluetooth module is provided with a remote control management unit and a Bluetooth signal processing subunit, and the remote control management unit has a built-in LPWAN transmission module; the remote control management unit configures the LPWAN transmission module in a transparent transmission working mode, so that its radio frequency port and the designated port are transparently transmitted, and other functional units connected to the LPWAN transmission module are managed and controlled through the designated port. The above circuit also has shortcomings: when the Bluetooth antenna transmits signals to the Bluetooth module, there is still a situation of signal interference, and even disconnection due to interference, which makes it extremely inconvenient to use. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a Bluetooth circuit with optimized interference function, which can solve the problem of increasing the anti-interference ability of Bluetooth during use and reducing the poor Bluetooth connection caused by the environment.

[0005] According to the utility model, a Bluetooth circuit for optimizing interference function includes a Bluetooth chip U1 and an antenna ATNT1, which are connected to each other. The characteristic is that a signal anti-interference circuit is arranged between the Bluetooth chip U1 and the antenna ATNT1, and the signal anti-interference circuit includes a first chip inductor L1, a second chip capacitor C2 and a first resistor R1. The first chip inductor L1 and the second chip capacitor C2 are connected in parallel, and one side of the first chip inductor L1 and the second chip capacitor C2 is connected to the first resistor R1. The antenna ATNT1 is connected to the common end between the second chip capacitor C2 and the first resistor R1, and the two ends of the first chip inductor L1 are respectively connected to the 15th and 16th pins of the Bluetooth chip U1.

[0006] Specifically, the Bluetooth chip U1 is further connected to a crystal oscillator chip X1, a third capacitor C1 is connected between the XIN terminal and the GND terminal of the crystal oscillator chip X1, and a fourth capacitor C3 is connected between the XOUT terminal and the GND terminal of the crystal oscillator chip X1.

[0007] Specifically, the Bluetooth chip U1 is also connected to a connector P1.

[0008] Specifically, pin 1 of the Bluetooth chip U1 is connected to a signal transmission voltage stabilizing circuit.

[0009] Specifically, the signal transmission voltage stabilizing circuit includes a second resistor R2, a third resistor R3 and a first transistor Q1, and the second resistor R2 and the third resistor R3 are connected to the first transistor Q1 respectively.

[0010] Specifically, pin 2 of the Bluetooth chip U1 is connected to a signal receiving voltage stabilizing circuit.

[0011] Specifically, the signal receiving voltage stabilizing circuit includes a fourth resistor R4, a fifth resistor R5 and a second transistor Q2, and the fourth resistor R4 and the fifth resistor R5 are respectively connected to the first diode Q2.

[0012] The beneficial effect of the utility model is that the circuit utilizes the interference filtering characteristics of the first chip inductor L1 and the second chip capacitor C2 in the signal anti-interference circuit, thereby filtering out interference to minimize the signal interference of the antenna ANT1, increase the signal strength, and meet the certification requirements, thereby solving the problem of reducing poor Bluetooth connection caused by the environment during the use of Bluetooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 It is a circuit diagram of the utility model.

[0015] Figure 2 The utility model is a signal transmission voltage stabilizing circuit diagram.

[0016] Figure 3 The utility model is a signal receiving voltage stabilizing circuit diagram. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] Reference below Figures 1 to 3 A Bluetooth circuit for optimizing interference function according to an embodiment of the utility model is described, including a Bluetooth chip U1 and an antenna ATNT1, the Bluetooth chip U1 and the antenna ATNT1 are connected, a signal anti-interference circuit is arranged between the Bluetooth chip U1 and the antenna ATNT1, the signal anti-interference circuit includes a first chip inductor L1, a second chip capacitor C2 and a first resistor R1, the first chip inductor L1 and the second chip capacitor C2 are connected in parallel, one side of the first chip inductor L1 and the second chip capacitor C2 is connected to the first resistor R1, the antenna ATNT1 is connected to the common end between the second chip capacitor C2 and the first resistor R1, and the two ends of the first chip inductor L1 are respectively connected to pins 15 and 16 of the Bluetooth chip U1.

[0019] By utilizing the interference filtering characteristics of the first patch inductor L1 and the second patch capacitor C2 in the signal anti-interference circuit, the inductance of the first patch inductor L is 4.7nH, thereby filtering out interference to minimize the signal interference of the antenna ANT1 and increase the signal strength. This can also meet the certification requirements.

[0020] Specifically, the Bluetooth chip U1 is also connected to a crystal oscillator chip X1, a third capacitor C1 is connected between the XIN end and the GND end of the crystal oscillator chip X1, and a fourth capacitor C3 is connected between the XOUT end and the GND end of the crystal oscillator chip X1. The Bluetooth chip U1 is also connected to a connector P1. Pin 1 of the Bluetooth chip U1 is connected to a signal transmission voltage stabilizing circuit. The signal transmission voltage stabilizing circuit includes a second resistor R2, a third resistor R3 and a first transistor Q1, and the second resistor R2 and the third resistor R3 are respectively connected to the first transistor Q1. Pin 2 of the Bluetooth chip U1 is connected to a signal reception voltage stabilizing circuit. The signal reception voltage stabilizing circuit includes a fourth resistor R4, a fifth resistor R5 and a second transistor Q2, and the fourth resistor R4 and the fifth resistor R5 are respectively connected to the first diode Q2.

[0021] The Bluetooth chip U1 receives the signal from the antenna ATNT1, and sends a signal from the 1st pin of the Bluetooth chip U1 to the signal receiving voltage stabilizing circuit. The signal receiving voltage stabilizing circuit plays a role in voltage stabilization, and the second transistor Q2 of the signal receiving voltage stabilizing circuit gets the 3V power supply and is in the guiding state. The second transistor Q2 transmits the information to the MCU chip, and the MCU chip implements the communication state;

[0022] The MCU chip then outputs the information to the Bluetooth chip U1 through the signal transmission voltage regulator circuit, and the Bluetooth chip U1 sends the signal to a designated place, such as a smartphone, through the antenna ATNT1. The antenna and Bluetooth module of the smartphone communicate with each other.

[0023] When the Bluetooth chip U1 sends out a signal or receives a signal through the signal anti-interference circuit, it filters the signal interference and increases the signal strength, effectively solving the problem of Bluetooth in use, increasing the anti-interference capability and reducing the poor Bluetooth connection caused by the environment.

[0024] The model of Bluetooth chip U1 is ST17H66B2. Crystal oscillator chip X1 can generate electrical signals with very precise frequencies, ensuring that the Bluetooth module can send signals to the designated target.

[0025] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A Bluetooth circuit for optimizing interference function, comprising a Bluetooth chip U1 and an antenna ATNT1, wherein the Bluetooth chip U1 and the antenna ATNT1 are connected, and characterized in that: A signal anti-interference circuit is provided between the Bluetooth chip U1 and the antenna ATNT1. The signal anti-interference circuit includes a first chip inductor L1, a second chip capacitor C2 and a first resistor R1. The first chip inductor L1 and the second chip capacitor C2 are connected in parallel. One side of the first chip inductor L1 and the second chip capacitor C2 is connected to the first resistor R1. The antenna ATNT1 is connected to the common end between the second chip capacitor C2 and the first resistor R1. The two ends of the first chip inductor L1 are respectively connected to pins 15 and 16 of the Bluetooth chip U1.

2. According to claim 1, a Bluetooth circuit for optimizing interference function, characterized in that: The Bluetooth chip U1 is also connected to a crystal oscillator chip X1, a third capacitor C1 is connected between the XIN terminal and the GND terminal of the crystal oscillator chip X1, and a fourth capacitor C3 is connected between the XOUT terminal and the GND terminal of the crystal oscillator chip X1.

3. According to claim 1, a Bluetooth circuit for optimizing interference function is characterized in that: The Bluetooth chip U1 is also connected to a connector P1.

4. The Bluetooth circuit for optimizing interference function according to claim 1, characterized in that: Pin 1 of the Bluetooth chip U1 is connected to a signal transmission voltage stabilizing circuit.

5. A Bluetooth circuit for optimizing interference function according to claim 4, characterized in that: The signal transmission voltage stabilizing circuit comprises a second resistor R2, a third resistor R3 and a first transistor Q1, and the second resistor R2 and the third resistor R3 are connected to the first transistor Q1 respectively.

6. The Bluetooth circuit for optimizing interference function according to claim 1, characterized in that: Pin 2 of the Bluetooth chip U1 is connected to a signal receiving voltage stabilizing circuit.

7. A Bluetooth circuit for optimizing interference function according to claim 6, characterized in that: The signal receiving voltage stabilizing circuit comprises a fourth resistor R4, a fifth resistor R5 and a second transistor Q2. The fourth resistor R4 and the fifth resistor R5 are connected to the second diode Q2 respectively.

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