CN219477849U - Separated network transformer circuit and network interface circuit - Google Patents
Separated network transformer circuit and network interface circuit Download PDFInfo
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- CN219477849U CN219477849U CN202320277893.9U CN202320277893U CN219477849U CN 219477849 U CN219477849 U CN 219477849U CN 202320277893 U CN202320277893 U CN 202320277893U CN 219477849 U CN219477849 U CN 219477849U
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Abstract
The embodiment of the utility model provides a separated network transformer circuit and a network interface circuit, wherein the separated network transformer circuit comprises: at least one transformer sub-circuit and at least one protection capacitor; the first end of the first isolation capacitor is used for being connected with the network chip, and the second end of the first isolation capacitor is connected with a first pin of the first common-mode inductor; the first end of the second isolation capacitor is used for being connected with the network chip, and the second end of the second isolation capacitor is connected with the second pin of the first common-mode inductor; the third pin of the first common-mode inductor is connected with the first pin of the second common-mode inductor, and the fourth pin is connected with the third pin of the second common-mode inductor; the first pin of the second common-mode inductor is also connected with the network port, and the third pin of the second common-mode inductor is also connected with the network port; the second pin of the second common mode inductor is connected with the ground through a protection capacitor, and the fourth pin of the second common mode inductor is connected with the ground through the protection capacitor. The embodiment of the utility model realizes the improvement of the safety of the separated network transformer.
Description
Technical Field
The present utility model relates to the field of network transformers, and in particular, to a split network transformer circuit and a network interface circuit.
Background
The network transformer is also called as a network isolation transformer, an Ethernet transformer, a network filter and the like, and is used for connecting a network chip and an RJ45 (Registered Jack-45, a standard interface) network interface in the Ethernet equipment, thereby playing roles of signal transmission, impedance matching, voltage isolation, signal clutter interference suppression and the like. The traditional integrated network transformer has large packaging volume, is easy to influence the design layout of hardware, generates the problems of structural interference, blocking a heat dissipation channel and the like, and the coil winding is usually completed by manual operation, so that the cost is high and the performance consistency is poor. Therefore, the separated network transformer is small in size compared with the traditional integrated network transformer, the key component, namely the I-shaped common mode inductance, is wound by a machine, the production efficiency is high, the cost is low, the performance consistency is good, and the problems of the traditional integrated network transformer can be well solved.
However, the current common split network transformers have a technical problem, as shown in fig. 1a and 1b, wherein P7MDIAP and P7MDIAN are network chips, ge1_mx1+ and ge1_mx1-represent currents, C1 and C2 represent isolation capacitors, T1 represents a first common-mode inductance, 1, 2, 3 and 4 of T1 represent four pins of the first common-mode inductance, T2 represents a second common-mode inductance, and 1, 2, 3 and 4 of T2 represent four pins of the second common-mode inductance. As can be seen, when the second pin and the fourth pin of the second common mode inductor are directly connected to the signal ground, and the terminal device adopting the split network transformer is connected with a POE (Power Over Ethernet ) switch which is also connected to the ground, the PSE (Power Sourcing Equipment, power supply equipment) outputs 48V normal electricity, and the POE switch is powered on and off, so that the 48V direct current output voltage anode is directly connected with the signal ground of the device itself through a loop formed by the network cable, the common mode inductor and the ground, which causes the problems of power short circuit, abnormal system functions and the like, and the safety is lower.
Disclosure of Invention
The embodiment of the utility model aims to provide a separated network transformer circuit and a network interface circuit so as to improve the safety of the separated network transformer. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present utility model provides a split network transformer circuit, including:
at least one transformer sub-circuit and at least one protection capacitor;
the transformer sub-circuit comprises a first isolation capacitor, a second isolation capacitor, a first common-mode inductor and a second common-mode inductor;
the first end of the first isolation capacitor is used for being connected with a network chip, and the second end of the first isolation capacitor is connected with a first pin of the first common-mode inductor;
the first end of the second isolation capacitor is used for being connected with a network chip, and the second end of the second isolation capacitor is connected with the second pin of the first common-mode inductor;
the third pin of the first common mode inductor is connected with the first pin of the second common mode inductor, and the fourth pin of the first common mode inductor is connected with the third pin of the second common mode inductor;
the first pin of the second common-mode inductor is also connected with a network port, and the third pin of the second common-mode inductor is also connected with the network port;
and a second pin of the second common mode inductor is connected with the ground through the protection capacitor, and a fourth pin of the second common mode inductor is connected with the ground through the protection capacitor.
In one embodiment of the present utility model,
the first pin and the second pin of the first common-mode inductor are homonymous terminal pins; the third pin and the fourth pin of the first common-mode inductor are homonymous terminal pins;
the first pin and the second pin of the second common-mode inductor are homonymous terminal pins, and the third pin and the fourth pin of the second common-mode inductor are homonymous terminal pins.
In one embodiment of the present utility model,
the first isolation capacitor and the second isolation capacitor are all nonpolar capacitors.
In one embodiment of the present utility model,
the protection capacitor is a nonpolar capacitor.
In one embodiment of the present utility model, each of the transformer sub-circuits corresponds to a protection capacitor, and the second pin and the fourth pin of the second common-mode inductor of each of the transformer sub-circuits are connected to ground through the protection capacitors.
In one embodiment of the present utility model, the transformer sub-circuits are in one-to-one correspondence with the protection capacitors, and for each transformer sub-circuit, the second pin and the fourth pin of the second common-mode inductor of the transformer sub-circuit are connected to ground through the protection capacitor corresponding to the transformer sub-circuit.
In one embodiment of the present utility model, the at least one protection capacitor comprises a plurality of protection capacitors, and each protection capacitor is connected in parallel;
and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitors which are connected in parallel.
In one embodiment of the utility model, the split network transformer circuit further comprises a surge protection device, the protection capacitor is connected with the surge protection device in parallel, and the second pin and the fourth pin of the second common mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitor and the surge protection device which are connected in parallel.
In a second aspect, an embodiment of the present utility model further provides a network interface circuit, including a network chip, a network port, and a split network transformer circuit as described in any one of the foregoing.
In one embodiment of the present utility model, the network port is an RJ45 network port.
According to the split network transformer circuit provided by the embodiment of the utility model, the second pin and the fourth pin of the second common mode capacitor are respectively connected with the system signal ground through the protection capacitor, so that a direct-current low-resistance channel between a signal wire in the split network transformer circuit and the signal ground and the ground is cut off, the problems of power short circuit, abnormal system functions and the like possibly caused when network equipment such as a POE switch and the like are connected can be effectively avoided, and the safety of the split network transformer circuit is improved.
Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1a is a schematic structural diagram of a conventional split network transformer;
FIG. 1b is a schematic illustration of a problem with a current split network transformer;
fig. 2 is a schematic structural diagram of a first split network transformer circuit according to an embodiment of the present utility model;
fig. 3a is a schematic structural diagram of a second split network transformer circuit according to an embodiment of the present utility model;
fig. 3b is a schematic structural diagram of a third split network transformer circuit according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a fourth split network transformer circuit according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a fifth split network transformer circuit according to an embodiment of the present utility model;
fig. 6 is a schematic structural diagram of a sixth split network transformer circuit according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of a network interface circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, those of ordinary skill in the art will be able to devise all other embodiments that are obtained based on this application and are within the scope of the present utility model.
Because the separated network transformer in the related art is easy to have the problems of power short circuit, abnormal system functions and the like, the safety is low, and in order to solve the problems, the embodiment of the utility model provides a separated network transformer circuit and a network interface circuit, and the separated network transformer circuit and the network interface circuit are explained in detail through specific embodiments.
The technical terms appearing in the present utility model will be explained first:
network transformer: the network transformer is also called as a network isolation transformer, an Ethernet transformer and a network filter, and in the Ethernet equipment, a network chip and a network interface are connected to play roles in signal transmission, impedance matching, voltage isolation, signal clutter suppression and the like.
Signal ground: and an equipotential point or plane of a circuit or system reference in the hardware circuit and a reference point of a zero-abrupt potential form a common end of a circuit signal loop.
Ground is: in engineering practice, the signal ground and the shell inside the equipment are connected with the ground, so that the ground is used as a ground reference point of the equipment, and the functions of discharging the charge accumulation of the metal chassis shell, protecting the safety of personnel, shielding electromagnetic interference and the like are achieved. Ground wires are common in three-hole sockets in household settings.
In a first aspect, as shown in fig. 2, an embodiment of the present utility model provides a schematic structural diagram of a first split network transformer circuit; the split network transformer circuit includes: at least one transformer sub-circuit and at least one protection capacitor;
the transformer sub-circuit comprises a first isolation capacitor, a second isolation capacitor, a first common-mode inductor and a second common-mode inductor;
the first end of the first isolation capacitor is used for being connected with a network chip, and the second end of the first isolation capacitor is connected with a first pin of the first common-mode inductor;
the first end of the second isolation capacitor is used for being connected with a network chip, and the second end of the second isolation capacitor is connected with the second pin of the first common-mode inductor;
the third pin of the first common mode inductor is connected with the first pin of the second common mode inductor, and the fourth pin of the first common mode inductor is connected with the third pin of the second common mode inductor;
the first pin of the second common-mode inductor is also connected with a network port, and the third pin of the second common-mode inductor is also connected with the network port;
the second pin of the second common mode inductor is connected with the ground through the protection capacitor, and the fourth pin of the second common mode inductor is also connected with the ground through the protection capacitor.
The split network transformer circuit includes one or more transformer subcircuits, and one or more protective capacitors. For each transformer sub-circuit, the transformer sub-circuit comprises a first isolation capacitor, a second isolation capacitor, a first common mode inductor and a second common mode inductor, wherein the first isolation capacitor and the second isolation capacitor are used for isolating direct current signals between the network chip and the transformer sub-circuit, and the first common mode inductor and the second common mode inductor are used for improving common mode performance of the transformer sub-circuit and simultaneously play a role of isolating the transformer.
The first end of the first isolation capacitor is connected with the network chip, and the second end of the first isolation capacitor is connected with the first pin of the first common-mode inductor. The first end of the second isolation capacitor is also connected with the network chip, and the second end of the second isolation capacitor is connected with the second pin of the first common-mode inductor.
The first common-mode inductor and the second common-mode inductor both comprise four pins, a third pin of the first common-mode inductor is connected with a first pin of the second common-mode inductor, and a fourth pin of the first common-mode inductor is connected with a third pin of the second common-mode inductor.
The third pin of the second common-mode inductor is also connected with the network port, and the first pin of the second common-mode inductor is also connected with the network port. In addition, the second pin of the second common-mode inductor is connected to the ground through the protection capacitor, and the fourth pin of the second common-mode inductor is also connected to the ground through the protection capacitor. Specifically, ground refers to signal ground.
Therefore, the second pin and the fourth pin of the second common mode capacitor are respectively connected with the system signal ground through the protective capacitor, so that a direct-current low-resistance channel between a signal wire in the separated network transformer circuit and the signal ground and the ground is cut off, the problems of power short circuit, abnormal system functions and the like possibly caused when network equipment such as a POE switch and the like are connected can be effectively avoided, and the safety of the separated network transformer circuit is improved.
In one embodiment of the present utility model,
the first pin and the second pin of the first common-mode inductor are homonymous terminal pins; the third pin and the fourth pin of the first common-mode inductor are homonymous terminal pins;
the first pin and the second pin of the second common-mode inductor are homonymous terminal pins, and the third pin and the fourth pin of the second common-mode inductor are homonymous terminal pins.
In the embodiment of the utility model, the first common-mode inductor and the second common-mode inductor replace the function of an inductance coil in a traditional integrated network transformer in a separated network transformer circuit, the first pin and the second pin of the first common-mode inductor are set as the same-name end pins, the third pin and the fourth pin of the first common-mode inductor are the same-name end pins, and the same-name end pins indicate that the directions of magnetic fluxes generated by the same-name end pins are the same when current is introduced.
The first pin and the second pin of the second common-mode inductor are homonymous terminal pins, the third pin and the fourth pin of the second common-mode inductor are homonymous terminal pins, in one example, the first pin and the third pin of the second common-mode inductor are non-homonymous terminal pins, namely, the directions of magnetic fluxes generated by the first pin and the third pin of the second common-mode inductor are different when current is introduced.
In the embodiment of the utility model, a pair of common-name terminal pins, namely a first pin and a second pin, of the first common-mode inductor are used for connecting the first isolation capacitor and the second isolation capacitor, and the other pair of common-name terminal pins, namely a third pin and a fourth pin, of the first common-mode inductor are used for respectively connecting a pair of non-common-name terminal pins, namely the first pin and the third pin, of the second common-mode inductor.
Therefore, the separated network transformer circuit provided by the utility model has the advantages that the pair of common-name end pins of the first common-mode inductor are connected with the first isolation capacitor and the second isolation capacitor, and the other pair of common-name end pins of the first common-mode inductor are respectively connected with the pair of non-common-name end pins of the second common-mode inductor, so that the effect of replacing the inductance coils in the traditional integrated network transformer by the first common-mode inductor and the second common-mode inductor is realized, and the separated network transformer circuit can realize the effect of a large-volume integrated network transformer by utilizing a small-volume circuit, and has high production efficiency, low cost and good performance consistency.
In one embodiment of the present utility model,
the first isolation capacitor and the second isolation capacitor are all nonpolar capacitors.
In one example, the capacitance values of the first isolation capacitor and the second isolation capacitor may be 100nF.
Therefore, the separation type network transformer circuit provided by the utility model has the advantages that the selection range of the first isolation capacitor and the second isolation capacitor is properly limited, so that the selected first isolation capacitor and second isolation capacitor can effectively realize the function of isolation through-crossing in the separation type network transformer circuit, and further the separation type network transformer circuit can effectively realize the functions of signal transmission, impedance matching, voltage isolation, signal clutter interference suppression and the like.
In one embodiment of the present utility model,
the protection capacitor is a nonpolar capacitor.
In one example, the withstand voltage of the protective capacitor is at least 2kV, and the capacitor may be 1nF.
Therefore, the separated network transformer circuit provided by the utility model has the advantages that the withstand voltage and the capacitance value range of the protection capacitor are properly limited, so that the selected protection capacitor can effectively cut off the direct-current low-resistance channel between the signal line in the separated network transformer circuit and the signal ground as well as the ground, the problems of power short circuit, system function abnormality and the like possibly caused when network equipment such as a POE switch and the like are connected can be effectively avoided, and the safety of the separated network transformer circuit is improved.
In one embodiment of the present utility model, as shown in fig. 3a, a schematic structural diagram of a second split network transformer circuit is provided, wherein C1, C3, C5, C7 are respectively the first isolation capacitors of the transformer sub-circuits, C2, C4, C6, C8 are respectively the second isolation capacitors of the transformer sub-circuits, T1, T3, T5, T7 are respectively the first common-mode inductors of the transformer sub-circuits, and 1, 2, 3, 4 respectively correspond to the first pin, the second pin, the third pin, and the fourth pin of the first common-mode inductors; t2, T4, T6 and T8 are respectively second common-mode inductances of the sub-circuits of the transformers, and 1, 2, 3 and 4 respectively correspond to a first pin, a second pin, a third pin and a fourth pin of each second common-mode inductance; the Bm1+/-, bm1_MX2+/-, bm1_MX3+/-, bm1_MX4+/-, are the current of each transformer sub-circuit. Specifically, the split network transformer circuit shown in fig. 3a is a circuit of a gigabit network transformer, and when the split network transformer is a hundred mega network transformer, two pairs of differential signal lines smaller than the gigabit network transformer, namely, the first and second isolation capacitors and the first and second common-mode inductors, are reduced from four groups to two groups, as shown in fig. 3 b.
And each transformer sub-circuit corresponds to one protection capacitor, and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitors.
In the embodiment of the utility model, the split network transformer circuit comprises a plurality of transformer sub-circuits, and each transformer sub-circuit corresponds to one protection capacitor, so that the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitor.
Therefore, the separated network transformer circuit provided by the utility model comprises a plurality of transformer sub-circuits, and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the same protective capacitor, so that a direct-current low-resistance channel between a signal wire in the separated network transformer circuit and the signal ground and between the ground can be cut off by only using one protective capacitor, the safety of the separated network transformer circuit is improved, meanwhile, the circuit design resources can be saved, and the cost is effectively reduced.
In an embodiment of the present utility model, as shown in fig. 4, a schematic structural diagram of a fourth split network transformer circuit is provided, where the transformer sub-circuits are in one-to-one correspondence with the protection capacitors, and for each transformer sub-circuit, the second pin and the fourth pin of the second common-mode inductor of the transformer sub-circuit are connected to ground through the protection capacitors corresponding to the transformer sub-circuits.
In the embodiment of the utility model, the split network transformer circuit comprises a plurality of transformer sub-circuits, each transformer sub-circuit corresponds to one protection capacitor, namely, the number of the transformer sub-circuits in the split network transformer circuit is consistent with that of the protection capacitors, each transformer sub-circuit corresponds to different protection capacitors one by one, and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the corresponding protection capacitors.
Therefore, the split network transformer circuit provided by the utility model comprises a plurality of transformer sub-circuits, the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the corresponding protection capacitors, and each transformer sub-circuit uses a single protection capacitor to realize the cutting-off of a direct-current low-resistance channel between a signal line and the signal ground as well as the ground, so that each transformer sub-circuit can be separated, and the safety of the split network transformer circuit is improved as much as possible.
In one embodiment of the present utility model, as shown in fig. 5, a schematic structural diagram of a fifth split network transformer circuit is provided, where at least one protection capacitor includes a plurality of protection capacitors, and each of the protection capacitors is connected in parallel;
and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitors which are connected in parallel.
In the embodiment of the utility model, the protection capacitor comprises a plurality of protection capacitors connected in parallel, and the second pin and the fourth pin of each transformer sub-circuit are connected with the ground through the plurality of protection capacitors connected in parallel.
In one example, the protection capacitors may be NF-level capacitors and PF-level capacitors, such as 1NF and 100PF, respectively.
Therefore, the separated network transformer circuit provided by the utility model comprises a plurality of transformer sub-circuits, the protection capacitor comprises a plurality of parallel protection capacitors, the second pin and the fourth pin of each transformer sub-circuit are connected with the ground through the plurality of parallel protection capacitors, and the direct current low-resistance channels between the signal wires in the separated network transformer circuit and the signal ground and between the signal wires and the ground are cut off by utilizing the plurality of parallel protection capacitors, so that the integral problem of the separated network transformer circuit is not caused even if the individual protection capacitors are in a problem, and in addition, the bandwidth can be increased, the electromagnetic interference can be reduced, and the safety of the separated network transformer circuit is improved as much as possible.
In one embodiment of the present utility model, as shown in fig. 6, a schematic structural diagram of a sixth split network transformer circuit is provided, where the split network transformer circuit further includes a surge protection device, the protection capacitor is connected in parallel with the surge protection device, and the second pin and the fourth pin of the second common-mode inductor of each of the transformer sub-circuits are connected to ground through the protection capacitor and the surge protection device that are connected in parallel.
In the embodiment of the utility model, the protection capacitor comprises one or more protection capacitors and one or more protection devices, and the protection device can be a TSS (Thyristor Surge Suppressors, semiconductor discharge tube), and each transformer sub-circuit is connected with the ground through the protection capacitor and the protection device after being connected in parallel.
Therefore, the separated network transformer circuit provided by the utility model comprises a plurality of transformer sub-circuits, the protection capacitor comprises the protection capacitor and the protection device which are connected in parallel, and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitor and the protection device which are connected in parallel, so that the direct-current low-resistance channel between the signal wire in the separated network transformer circuit and the signal ground and between the signal wire and the ground can be cut off, the port surge and lightning stroke protection capability can be increased, and the safety of the separated network transformer circuit is effectively improved.
In a second aspect, as shown in fig. 7, an embodiment of the present utility model provides a schematic structural diagram of a network interface circuit, including a network chip, a network port, and a split network transformer circuit as described above.
In one embodiment of the present utility model,
the network port is an RJ45 network port.
Therefore, the network interface circuit provided by the utility model utilizes the separated network transformer circuit to connect the network chip and the network port, so that the problems of power short circuit, system function abnormality and the like possibly caused when network equipment such as a POE switch and the like are connected can be avoided as far as possible, and the overall safety of the network interface circuit is further improved.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.
Claims (10)
1. A split network transformer circuit, comprising:
at least one transformer sub-circuit and at least one protection capacitor;
the transformer sub-circuit comprises a first isolation capacitor, a second isolation capacitor, a first common-mode inductor and a second common-mode inductor;
the first end of the first isolation capacitor is used for being connected with a network chip, and the second end of the first isolation capacitor is connected with a first pin of the first common-mode inductor;
the first end of the second isolation capacitor is used for being connected with a network chip, and the second end of the second isolation capacitor is connected with the second pin of the first common-mode inductor;
the third pin of the first common mode inductor is connected with the first pin of the second common mode inductor, and the fourth pin of the first common mode inductor is connected with the third pin of the second common mode inductor;
the first pin of the second common-mode inductor is also connected with a network port, and the third pin of the second common-mode inductor is also connected with the network port;
and a second pin of the second common mode inductor is connected with the ground through the protection capacitor, and a fourth pin of the second common mode inductor is connected with the ground through the protection capacitor.
2. The split network transformer circuit of claim 1, wherein,
the first pin and the second pin of the first common-mode inductor are homonymous terminal pins; the third pin and the fourth pin of the first common-mode inductor are homonymous terminal pins;
the first pin and the second pin of the second common-mode inductor are homonymous terminal pins, and the third pin and the fourth pin of the second common-mode inductor are homonymous terminal pins.
3. The split network transformer circuit of claim 1, wherein,
the first isolation capacitor and the second isolation capacitor are all nonpolar capacitors.
4. The split network transformer circuit of claim 1, wherein,
the protection capacitor is a nonpolar capacitor.
5. The split network transformer circuit of claim 1, wherein each of the transformer sub-circuits corresponds to a protection capacitor, and wherein the second pin and the fourth pin of the second common-mode inductor of each of the transformer sub-circuits are connected to ground through the protection capacitors.
6. The split network transformer circuit of claim 1, wherein the transformer sub-circuits are in one-to-one correspondence with the protection capacitors, and for each transformer sub-circuit, the second pin and the fourth pin of the second common-mode inductor of the transformer sub-circuit are connected to ground through the protection capacitor corresponding to the transformer sub-circuit.
7. The split network transformer circuit of claim 1, wherein at least one protection capacitor comprises a plurality of protection capacitors, each of the protection capacitors being connected in parallel;
and the second pin and the fourth pin of the second common-mode inductor of each transformer sub-circuit are connected with the ground through the protection capacitors which are connected in parallel.
8. The split network transformer circuit of claim 7, further comprising a surge protection device, wherein the protection capacitor is connected in parallel with the surge protection device, wherein the second pin and the fourth pin of the second common-mode inductor of each of the transformer subcircuits are connected to ground through the protection capacitor and the surge protection device in parallel.
9. A network interface circuit comprising a network chip, a network port and a split network transformer circuit as claimed in any one of claims 1 to 8.
10. The network interface circuit of claim 9, wherein the network port is an RJ45 network port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320277893.9U CN219477849U (en) | 2023-02-09 | 2023-02-09 | Separated network transformer circuit and network interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320277893.9U CN219477849U (en) | 2023-02-09 | 2023-02-09 | Separated network transformer circuit and network interface circuit |
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| Publication Number | Publication Date |
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| CN219477849U true CN219477849U (en) | 2023-08-04 |
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| CN202320277893.9U Active CN219477849U (en) | 2023-02-09 | 2023-02-09 | Separated network transformer circuit and network interface circuit |
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| CN (1) | CN219477849U (en) |
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- 2023-02-09 CN CN202320277893.9U patent/CN219477849U/en active Active
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