CN211788583U - Communication anti-interference device of network transformer - Google Patents
Communication anti-interference device of network transformer Download PDFInfo
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- CN211788583U CN211788583U CN202020459837.3U CN202020459837U CN211788583U CN 211788583 U CN211788583 U CN 211788583U CN 202020459837 U CN202020459837 U CN 202020459837U CN 211788583 U CN211788583 U CN 211788583U
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- capacitor
- protection circuit
- isolation
- network transformer
- interference
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- 238000004891 communication Methods 0.000 title claims abstract description 24
- 238000002955 isolation Methods 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 38
- 230000006378 damage Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model discloses a network transformer communication anti jamming unit, including drive chip, EMC unit and RJ45 interface, the EMC unit includes protection circuit, buffer protection circuit and isolation output circuit, common mode inductance CT1 and transformer T1 carry out preliminary protection to thunderbolt or electrostatic interference in the protection circuit to adopt the inductance magnetic ring in order to reduce the speed of discharging, TVS pipe reduction interference's influence harm; the buffer protection circuit forms an RC network to perform discharge buffering on output signals at two ends of the TVS tube D1, so that smooth discharge of high-voltage charges is ensured; the isolation output circuit adopts the voltage follower to carry out isolation processing on the output signal of the buffer protection circuit, improves the isolation effect and the communication signal transmission capability of the network transformer, reduces external interference through capacitance filtering, finally sends the interference resistance to the RJ45 interface, greatly improves the communication interference resistance of the network transformer, and can effectively ensure that 5G signal communication is carried out without difference.
Description
Technical Field
The utility model relates to a network transformer communication technology field especially relates to network transformer communication anti jamming unit.
Background
Transformer), also known as a data mercury/network isolation Transformer, mainly comprises a center-tapped capacitor, a Transformer, an autotransformer, and a common-mode inductor, and is usually installed near the input end of a network card. When the device works, uplink data signals sent by the transceiver enter from the Pin16-Pin15 of the network transformer, are output by the Pin10-Pin11, pass through the RJ45 interface and are sent to the server through the unshielded twisted pair, and the device is mainly applied to the middle of an Ethernet PHY chip and an RJ45 interface. network transformer (Ethernet)
With the arrival of the 5G era, network transformers are widely applied to 5G signal communication with good transmission capacity and isolation capacity, and in order to ensure safe and reliable operation of 5G network equipment, a circuit EMC design scheme is usually added in the network transformers, so that lightning stroke, static electricity and other protection are performed on communication interfaces. The existing circuit EMC design scheme mainly adopts the mode of differential connection of a transformer and a common-mode inductor to inhibit the external interference, the isolation effect and the high-voltage charge release are not ideal, and the error-free property of 5G signal network transformer communication cannot be ensured.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above situation, in order to overcome the defects of the prior art, the present invention provides an anti-interference device for network transformer communication.
The technical scheme for solving the problem is as follows: the network transformer communication anti-interference device comprises a driving chip, an EMC unit and an RJ45 interface, wherein the EMC unit comprises a protection circuit, a buffer protection circuit and an isolation output circuit, the protection circuit comprises a common-mode inductor CT1, pins 1 and 3 of the common-mode inductor CT1 are connected with two ends of a capacitor C2 through a transformer T1, a pin 2 of the common-mode inductor CT1 is sequentially grounded through a resistor R1 and a capacitor C1, one end of the capacitor C2 is connected with one end of a TVS tube D1 through an inductor L1, and the other end of the capacitor C2 is connected with the other end of a TVS tube D1 through an inductor L2; the buffer protection circuit forms an RC network to discharge and buffer output signals at two ends of the TVS tube D1; the isolation output circuit adopts a voltage follower to isolate the output signal of the buffer protection circuit and sends the output signal to the RJ45 interface after being filtered by a capacitor.
Furthermore, the buffer protection circuit comprises thermistors RM1 and RM2, one end of the thermistor RM1 is connected with one end of a TVS tube D1, and the other end of the thermistor RM1 is connected with one end of a capacitor C5 through a resistor R2 and a capacitor C3 which are connected in parallel; one end of the thermistor RM2 is connected to the other end of the TVS tube D1, and the other end of the thermistor RM2 is connected to the other end of the capacitor C5 through the resistor R3 and the capacitor C4 which are connected in parallel.
Furthermore, the isolation output circuit comprises operational amplifiers AR1 and AR2, a non-inverting input terminal of the operational amplifier AR1 is connected to one end of the capacitor C5, a non-inverting input terminal of the operational amplifier AR2 is connected to the other end of the capacitor C5, and inverting input terminals and output terminals of the operational amplifiers AR1 and AR2 are connected to the RJ45 interface and are grounded through capacitors C6 and C7, respectively.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses common mode inductance CT1 and transformer T1 in the protection circuit carry out preliminary protection to thunderbolt or electrostatic interference, and adopt the inductance magnetic ring in order to reduce the discharge speed, TVS pipe reduces the influence harm of interference;
2. the buffer protection circuit forms an RC network to perform discharge buffering on output signals at two ends of the TVS tube D1, so that smooth discharge of high-voltage charges is ensured;
3. the isolation output circuit adopts the voltage follower to carry out isolation processing on the output signal of the buffer protection circuit, improves the isolation effect and the communication signal transmission capability of the network transformer, reduces external interference through capacitance filtering, and enables the network transformer to have very good anti-interference capability in communication with the RJ45 interface.
Drawings
Fig. 1 is a schematic diagram of the protection circuit of the present invention.
Fig. 2 is a schematic diagram of the connection between the buffer protection circuit and the isolation output circuit.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The anti-interference device for network transformer communication comprises a driving chip, an EMC unit and an RJ45 interface, wherein the EMC unit comprises a protection circuit, a buffer protection circuit and an isolation output circuit. As shown in fig. 1, the protection circuit includes a common mode inductor CT1, pins 1 and 3 of the common mode inductor CT1 are connected to two ends of a capacitor C2 through a transformer T1, and pin 2 of the common mode inductor CT1 is grounded through a resistor R1 and a capacitor C1 in sequence. The common-mode inductor CT1 couples and filters the differential signal output by the driver chip to enhance the signal, and then sends the signal to the transformer T1 for common-mode rejection.
When the network transformer is struck by lightning or interfered by static electricity, the common-mode inductor CT1 can primarily release high-voltage charges, and the capacitor C2 plays a role in low-pass filtering. And then, the rear-stage circuit still has the transmission of large current, in order to avoid causing the damage to the network transformer, add inductance magnetic ring in the rear-stage circuit in order to reduce the speed of discharging, and adopt TVS pipe to avoid the influence harm of transient interference such as static electricity, inductive load switching, lightning stroke induced voltage. One end of the capacitor C2 is connected to one end of the TVS transistor D1 through the inductor L1, and the other end of the capacitor C2 is connected to the other end of the TVS transistor D1 through the inductor L2.
In order to ensure that the high-voltage charges in the protection circuit are completely released, the buffer protection circuit forms an RC network to discharge and buffer the output signal at two ends of the TVS tube D1. As shown in fig. 2, the buffer protection circuit comprises thermistors RM1 and RM2, one end of the thermistor RM1 is connected with one end of a TVS tube D1, and the other end of the thermistor RM1 is connected with one end of a capacitor C5 through a resistor R2 and a capacitor C3 which are connected in parallel; one end of the thermistor RM2 is connected to the other end of the TVS tube D1, and the other end of the thermistor RM2 is connected to the other end of the capacitor C5 through the resistor R3 and the capacitor C4 which are connected in parallel. The thermistors RM1 and RM2 are respectively used as voltage dividing resistors of the parallel RC, so that the voltage amplitude of the parallel RC is greatly reduced, and smooth discharge of high-voltage charges is ensured.
The isolation output circuit comprises operational amplifiers AR1 and AR2, wherein the non-inverting input end of the operational amplifier AR1 is connected with one end of a capacitor C5, the non-inverting input end of the operational amplifier AR2 is connected with the other end of a capacitor C5, and the inverting input ends and the output ends of the operational amplifiers AR1 and AR2 are connected with RJ45 interfaces and are grounded through capacitors C6 and C7. The operational amplifiers AR1 and AR2 isolate and output the buffer protection circuit by using the voltage follower principle, so that good electrical isolation is formed between the operational amplifiers and the preceding stage circuit, and the isolation function and the communication signal transmission capability of the network transformer are improved. The C6 and the C7 are filter capacitors, so that a low-impedance backflow path is further provided for interference, external common mode current is effectively reduced, and meanwhile, external interference can be filtered, so that the network transformer and the RJ45 interface communication have very good anti-interference capability.
The utility model discloses when specifically using, common mode inductance CT1 and transformer T1 carry out preliminary protection to thunderbolt or electrostatic interference among the protection circuit to adopt the inductance magnetic ring to reduce the influence harm that discharge speed, TVS pipe reduced the interference. The buffer protection circuit forms an RC network to discharge and buffer output signals at two ends of the TVS tube D1, and smooth discharge of high-voltage charges is guaranteed. The isolation output circuit adopts the voltage follower to carry out isolation processing on the output signal of the buffer protection circuit, improves the isolation effect and the communication signal transmission capability of the network transformer, reduces external interference through capacitance filtering, finally sends the interference resistance to the RJ45 interface, greatly improves the communication interference resistance of the network transformer, and can effectively ensure that 5G signal communication is carried out without difference.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (3)
1. Network transformer communication anti jamming unit, including driver chip, EMC unit and RJ45 interface, its characterized in that: the EMC unit comprises a protection circuit, a buffer protection circuit and an isolation output circuit, the protection circuit comprises a common-mode inductor CT1, pins 1 and 3 of the common-mode inductor CT1 are connected with two ends of a capacitor C2 through a transformer T1, a pin 2 of the common-mode inductor CT1 is grounded through a resistor R1 and a capacitor C1 in sequence, one end of the capacitor C2 is connected with one end of a TVS tube D1 through an inductor L1, and the other end of the capacitor C2 is connected with the other end of the TVS tube D1 through an inductor L2; the buffer protection circuit forms an RC network to discharge and buffer output signals at two ends of the TVS tube D1; the isolation output circuit adopts a voltage follower to isolate the output signal of the buffer protection circuit and sends the output signal to the RJ45 interface after being filtered by a capacitor.
2. The network transformer communication interference rejection device of claim 1, wherein: the buffer protection circuit comprises thermistors RM1 and RM2, one end of the thermistor RM1 is connected with one end of a TVS tube D1, and the other end of the thermistor RM1 is connected with one end of a capacitor C5 through a resistor R2 and a capacitor C3 which are connected in parallel; one end of the thermistor RM2 is connected to the other end of the TVS tube D1, and the other end of the thermistor RM2 is connected to the other end of the capacitor C5 through the resistor R3 and the capacitor C4 which are connected in parallel.
3. The network transformer communication interference rejection device of claim 2, wherein: the isolation output circuit comprises operational amplifiers AR1 and AR2, wherein the non-inverting input end of the operational amplifier AR1 is connected with one end of a capacitor C5, the non-inverting input end of the operational amplifier AR2 is connected with the other end of a capacitor C5, and the inverting input ends and the output ends of the operational amplifiers AR1 and AR2 are connected with the RJ45 interface and are grounded through capacitors C6 and C7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020459837.3U CN211788583U (en) | 2020-04-01 | 2020-04-01 | Communication anti-interference device of network transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020459837.3U CN211788583U (en) | 2020-04-01 | 2020-04-01 | Communication anti-interference device of network transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211788583U true CN211788583U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020459837.3U Expired - Fee Related CN211788583U (en) | 2020-04-01 | 2020-04-01 | Communication anti-interference device of network transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211788583U (en) |
-
2020
- 2020-04-01 CN CN202020459837.3U patent/CN211788583U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201027 |