Network interface electrostatic protection circuit and network interface circuit

Abstract

The utility model discloses a network interface electrostatic protection circuit and a network interface circuit, the network interface electrostatic protection circuit is applied to the network interface circuit, is connected with a network transformer of the network interface circuit, and comprises an input capacitor and at least two magnetic beads, and the magnetic beads are connected in parallel and then are connected in series with the input capacitor. The first end of the magnetic bead is connected with the second end of the input capacitor, the second end of the magnetic bead is grounded, and the first end of the input capacitor is connected with the network transformer. According to the network interface electrostatic protection circuit of the utility model, the at least two magnetic beads connected in parallel are connected between the input capacitor and the ground end, so that static electricity of the ground end can be prevented from interfering with the network interface circuit, and the working frequency of the network interface circuit can be prevented from radiating to the ground end; instantaneous high-frequency energy of electrostatic interference caused by manual frequent plugging is converted into heat energy to be dissipated, and static absorption and release of the network interface are realized in cooperation with the isolation effect of the input capacitor, so that the network interface works more stably, and the circuit is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-static electricity, in particular to a network interface electrostatic protection circuit and a network interface circuit. Background Art

[0002] With the development of communication technology, the application of wired transmission network technology has been greatly expanded. There is a great demand for network interfaces in commercial flat-panel TVs, home TVs, projectors, medical electronic equipment, etc. However, traditional network interfaces are exposed to the external environment, and frequent manual plugging and unplugging will cause static interference, affecting the normal operation of the network interface and even the equipment. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a network interface electrostatic protection circuit and a network interface, so as to perform electrostatic protection on the network interface and improve the anti-interference ability of the equipment.

[0004] In the first aspect, the utility model provides a network interface electrostatic protection circuit, which is applied to the network interface circuit and connected to the network transformer of the network interface circuit. The network interface electrostatic protection circuit includes an input capacitor and at least two magnetic beads. The magnetic beads are connected in parallel with each other and then in series with the input capacitor. The first end of the magnetic bead is connected to the second end of the input capacitor, the second end of the magnetic bead is connected to the ground, and the first end of the input capacitor is connected to the network transformer.

[0005] In a second aspect, the utility model also provides a network interface circuit, including a control module, a network transformer, a network interface and the above-mentioned network interface electrostatic protection circuit, wherein the network transformer is connected to the control module, the network interface and the network interface electrostatic protection circuit.

[0006] The beneficial technical effect of the utility model is that the network interface electrostatic protection circuit of the utility model can prevent the static electricity of the ground terminal from interfering with the network interface circuit by connecting at least two mutually parallel magnetic beads between the input capacitor and the ground terminal, and can prevent the working frequency of the network interface circuit from radiating to the ground terminal, convert the instantaneous high-frequency energy of the electrostatic interference caused by frequent artificial plugging and unplugging into heat energy and dissipate it, cooperate with the isolation effect of the input capacitor to realize the electrostatic absorption and release of the network interface, so that the network interface works more stably and has a longer life, which is conducive to improving the performance of electronic equipment, and the circuit is simple. The network interface circuit of the utility model also has the above functions and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 A circuit diagram of a network interface electrostatic protection circuit provided by an embodiment of the utility model;

[0009] Figure 2 A circuit diagram of a network interface electrostatic protection circuit provided by another embodiment of the utility model;

[0010] Figure 3 This is a schematic diagram of the framework of the network interface circuit provided by the utility model. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] See also Figure 1 , Figure 1 A circuit diagram of a network interface electrostatic protection circuit provided in an embodiment of the utility model, wherein the network interface electrostatic protection circuit 10 is applied to a network interface circuit and is connected to a network transformer of the network interface circuit. The network interface electrostatic protection circuit 10 includes an input capacitor C1 and at least two magnetic beads 11. The magnetic beads 11 are connected in parallel with each other and then connected in series with the input capacitor C1. The first end of the magnetic bead 11 is connected to the second end of the input capacitor C1, the second end of the magnetic bead 11 is connected to the ground, and the first end of the input capacitor C1 is connected to the network transformer.

[0013] Among them, a network transformer is set in the network interface circuit to isolate and protect the network interface. The network interface electrostatic protection circuit 10 can prevent the static electricity of the ground end from interfering with the network interface circuit by connecting at least two magnetic beads 11 connected in parallel between the input capacitor C1 and the ground end, and can prevent the working frequency of the network interface circuit from radiating to the ground end, convert the instantaneous high-frequency energy of the electrostatic interference caused by frequent artificial plugging and unplugging into heat energy and dissipate it, cooperate with the isolation effect of the input capacitor C1 to realize the electrostatic absorption and release of the network interface, so as to perform electrostatic protection on the network interface, make the network interface work more stably, have a longer life, improve the anti-interference ability of the equipment, and help improve the performance of the electronic equipment, and the circuit is simple. Moreover, setting at least two magnetic beads 11 connected in parallel can share the electrostatic interference required to be absorbed, and improve the electrostatic protection effect and efficiency.

[0014] Preferably, the number of the magnetic beads 11 is two, and the two magnetic beads 11 are connected in parallel with each other and connected in series with the input capacitor C1, the first ends of the two magnetic beads 11 are connected and connected to the second end of the input capacitor C1, the second ends of the two magnetic beads 11 are connected and connected to the ground, and the first end of the input capacitor C1 is connected to the network transformer.

[0015] Specifically, the network interface electrostatic protection circuit 10 further includes an input resistor R1, which is connected to the first end of the magnetic bead 11 through the input capacitor C1, and the first end of the input capacitor is connected to the network transformer through the input resistor R1. The input resistor R1 can be set to limit the current and protect the components in the network interface electrostatic protection circuit 10.

[0016] Specifically, the impedance generated by the magnetic bead 11 at a frequency of 100 MHz is 100 Ω. When the frequency of the magnetic bead of this specification reaches 100 MHz, its impedance can be increased to 100 Ω, which can better absorb electrostatic charges.

[0017] Specifically, the magnetic beads 11 are ferrite beads, which have high resistivity and exhibit inductive characteristics at low frequencies, resulting in very small losses. At high frequencies, the impedance becomes high, exhibiting high reactance characteristics, so that high-frequency energy is converted into heat energy and dissipated. When the magnetic beads 11 are connected in series in the circuit, the high-frequency current at the moment of static electricity release will be converted into heat energy and dissipated. Preferably, the magnetic beads 11 are laminated chip magnetic beads.

[0018] See also Figure 2 , Figure 2This is a circuit diagram of a network interface electrostatic protection circuit provided by another embodiment of the utility model. The network interface electrostatic protection circuit 10 also includes a connection capacitor C2, the connection capacitor C2 is connected in parallel with the magnetic bead 11, the first end of the connection capacitor C2 is connected to the second end of the input capacitor C1, and the second end of the connection capacitor C2 is grounded. The connection capacitor C2 can isolate high-frequency voltage and low-frequency ground, and absorb part of the energy to temporarily delay the impact caused by electrostatic discharge. The rest of the structure and function of this embodiment are similar to the previous embodiment, and will not be repeated here.

[0019] Combination Figure 3 , Figure 3 Schematic diagram of the framework of the network interface circuit of the utility model, the network interface circuit 20 includes a control module 21, a network transformer 22, a network interface 23 and the above-mentioned network interface electrostatic protection circuit 10, the network transformer 22 is connected to the control module 21, the network interface 23 and the network interface electrostatic protection circuit 10. Preferably, the network interface 23 adopts an RJ45 interface.

[0020] In summary, the network interface electrostatic protection circuit of the utility model can prevent the static electricity of the ground terminal from interfering with the network interface circuit by connecting at least two mutually parallel magnetic beads between the input capacitor and the ground terminal, and can prevent the working frequency of the network interface circuit from radiating to the ground terminal, convert the instantaneous high-frequency energy of the electrostatic interference caused by frequent artificial plugging and unplugging into heat energy and dissipate it, cooperate with the isolation effect of the input capacitor to realize the electrostatic absorption and release of the network interface, so that the network interface works more stably and has a longer life, which is conducive to improving the performance of electronic equipment, and the circuit is simple. The network interface circuit of the utility model also has the above functions and is highly practical.

[0021] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A network interface electrostatic protection circuit, characterized in that: Applied to a network interface circuit, connected to a network transformer of the network interface circuit, the network interface electrostatic protection circuit comprises an input capacitor and at least two magnetic beads, the magnetic beads are connected in parallel with each other and then connected in series with the input capacitor, the first end of the magnetic bead is connected to the second end of the input capacitor, the second end of the magnetic bead is connected to the ground, and the first end of the input capacitor is connected to the network transformer.

2. The network interface electrostatic protection circuit according to claim 1, characterized in that: The number of the magnetic beads is two.

3. The network interface electrostatic protection circuit according to claim 1, characterized in that: The network interface electrostatic protection circuit also includes an input resistor, and the input resistor is connected to the first end of the magnetic bead through the input capacitor.

4. The network interface electrostatic protection circuit according to claim 1, characterized in that: The network interface electrostatic protection circuit also includes a connection capacitor, which is connected in parallel with the magnetic bead, a first end of the connection capacitor is connected to the second end of the input capacitor, and a second end of the connection capacitor is grounded.

5. The network interface electrostatic protection circuit according to claim 1, characterized in that: The impedance generated by the magnetic beads at a frequency of 100 MHz is 100Ω.

6. The network interface electrostatic protection circuit according to claim 1, characterized in that: The magnetic beads are ferrite beads.

7. The network interface electrostatic protection circuit according to claim 1, characterized in that: The magnetic beads are laminated sheet-type magnetic beads.

8. A network interface circuit, characterized in that: It comprises a control module, a network transformer, a network interface and the network interface electrostatic protection circuit according to any one of claims 1 to 7, wherein the network transformer is connected to the control module, the network interface and the network interface electrostatic protection circuit.

9. The network interface circuit according to claim 8, characterized in that: The network interface adopts an RJ45 interface.

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