CN220915286U - Power over Ethernet circuit and power over Ethernet module - Google Patents

Abstract

The utility model discloses a power over Ethernet circuit and a power over Ethernet module, and relates to the field of power over Ethernet. The Ethernet power supply circuit comprises an Ethernet physical layer chip, a conversion interface, a differential line component, a network transformer and a power supply module. The Ethernet physical layer chip sends and receives Ethernet signals, the network transformer is connected with the Ethernet physical layer chip through the primary differential line pair, and is connected with the switching port through the secondary differential line pair, and the switching port is used for being connected with power receiving end equipment. In this manner, ethernet signals may be transmitted between the ethernet physical layer chip and the powered end device. The power supply module outputs a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port. In the utility model, the direct current power supply is directly transmitted to the transfer interface through the secondary differential line pair and then is transmitted to the power receiving end equipment for supplying power, namely, the coil of the network transformer does not need to pass through large current, the requirement on the coil is not high, and the network transformer with lower cost and smaller volume can be used.

Description

Power over Ethernet circuit and power over Ethernet module

Technical Field

The present utility model relates to the field of power over ethernet technology, and in particular, to a power over ethernet circuit and a power over ethernet module.

Background

With the development of communication product technology, under the condition that the existing ethernet wiring infrastructure is not changed, the power supply module transmits data signals to some IP-based terminals (such as IP phones, wireless local area network Access Points (APs), network cameras and the like), and meanwhile, the power supply technology of the ethernet can be utilized to provide direct current power supply for the devices. These IP-based terminals do not require a separate installation of a power supply device and a power supply line for this purpose, which is called a power receiving end device.

The network transformer in the existing Ethernet power supply circuit is generally connected with a power supply module through a center tap, direct current power supply is realized through the center tap, and the coil of the network transformer needs to pass through large current and is thick, so that the network transformer is high in price and large in space volume, and is unfavorable for miniaturization and high density of products.

Disclosure of utility model

The utility model aims to provide a power over Ethernet circuit, which aims to realize power over Ethernet by using a network transformer with lower cost and smaller volume, and is beneficial to miniaturization and high density of products.

To achieve the above object, the power over ethernet circuit includes:

An Ethernet physical layer chip for transmitting and receiving Ethernet signals;

the power supply terminal equipment is connected with the interface;

the differential line assembly comprises a primary differential line pair and a secondary differential line pair;

The network transformer is provided with a primary coil and a secondary coil, the primary coil is connected with the Ethernet physical layer chip through the primary differential line pair, and the secondary coil is connected with the switching port through the secondary differential line pair; the network transformer is used for isolating the primary differential line pair and the secondary differential line pair;

The power supply module is provided with a power input end and a power output port, the power input end of the power supply module is connected with a power supply, and the power output port of the power supply module is connected with the secondary differential line pair; the power supply module is used for outputting a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port.

Optionally, the power over ethernet circuit further comprises a high frequency isolation circuit; the power output port of the power supply module is connected with the secondary differential line pair through the high-frequency isolation circuit; the high-frequency isolation circuit is used for isolating Ethernet signals on the secondary differential line pair from entering the power supply module.

Optionally, the number of the primary differential line pairs and the secondary differential line pairs are two, and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module comprises a first power output end and a second power output end;

The first power output end of the power supply module is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair through the high-frequency isolation circuit;

And the second power output end of the power supply module is respectively connected with the first connecting wire and the second connecting wire of the other secondary differential wire pair through the high-frequency isolation circuit.

Optionally, the high-frequency isolation circuit includes a first inductor, a second inductor, a third inductor, and a fourth inductor;

The first power output end of the power supply module is connected with a first connecting wire of one secondary differential wire pair through the first inductor and connected with a second connecting wire of one secondary differential wire pair through the second inductor;

The second power output end of the power supply module is connected with the first connecting wire of the other secondary differential wire pair through the third inductor and the second connecting wire of the other secondary differential wire pair through the fourth inductor.

The utility model also provides a power over Ethernet module, which aims to achieve the purposes of saving the space of a main board and compatible design.

In order to achieve the above object, the power over ethernet module includes:

The main board is provided with an Ethernet physical layer chip, a network transformer and a primary differential line pair; the network transformer is provided with a primary coil and a secondary coil, the primary coil is connected with the Ethernet physical layer chip through the primary differential line pair, and the Ethernet physical layer chip is used for transmitting and receiving Ethernet signals;

the interface board is provided with a power supply module, a conversion interface and a secondary differential line pair; the secondary coil is connected with the switching port through the secondary differential line pair; the power supply module is provided with a power input end and a power output port, the power input end of the power supply module is connected with a power supply, and the power output port of the power supply module is connected with the secondary differential line pair; the transfer port is used for connecting power receiving end equipment;

the network transformer is used for isolating the primary differential line pair and the secondary differential line pair;

And the power supply module is used for outputting a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port.

Optionally, a high-frequency isolation circuit is further arranged on the interface board; the power output port of the power supply module is connected with the secondary differential line pair through the high-frequency isolation circuit; the high-frequency isolation circuit is used for isolating Ethernet signals on the secondary differential line pair from entering the power supply module.

Optionally, the number of the primary differential line pairs and the secondary differential line pairs are two, and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module comprises a first power output end and a second power output end;

The first power output end of the power supply module is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair through the high-frequency isolation circuit;

And the second power output end of the power supply module is respectively connected with the first connecting wire and the second connecting wire of the other secondary differential wire pair through the high-frequency isolation circuit.

Optionally, the high-frequency isolation circuit includes a first inductor, a second inductor, a third inductor, and a fourth inductor;

The first power output end of the power supply module is connected with a first connecting wire of one secondary differential wire pair through the first inductor and connected with a second connecting wire of one secondary differential wire pair through the second inductor;

The second power output end of the power supply module is connected with the first connecting wire of the other secondary differential wire pair through the third inductor and the second connecting wire of the other secondary differential wire pair through the fourth inductor.

The utility model transmits and receives Ethernet signals through the Ethernet physical layer chip. When the Ethernet physical layer chip sends an Ethernet signal, a primary coil of the network transformer receives the Ethernet signal through the primary differential line pair, a secondary coil of the network transformer outputs the Ethernet signal to the switching port through the secondary differential line pair, and the switching port sends the Ethernet signal to the power receiving end equipment. Similarly, the switching port may also receive an ethernet signal of the powered device, and then the ethernet physical layer chip receives the ethernet signal through the secondary differential line pair, the network transformer and the primary differential line pair. In this way, the power over ethernet circuit completes the transmission of the ethernet signal. In the utility model, the power supply module outputs a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port. Since the ethernet signals are high frequency ac voltages and the dc power sources are dc voltages, they can be transmitted simultaneously over the secondary differential pair without affecting each other. The direct current power supply is directly transmitted to the transfer port through the secondary differential line pair and then is transmitted to the power receiving end equipment to supply power, and the direct current power supply output by the power supply module does not need to pass through the network transformer, so that the coil of the network transformer does not need to pass through large current, the requirement on the coil is not high, and the network transformer is lower in cost and smaller in volume. Therefore, the utility model reduces the cost of the Ethernet power supply and is beneficial to miniaturization and high density of products.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required 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 the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a power over Ethernet circuit according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of a power over Ethernet circuit according to another embodiment of the utility model;

Fig. 3 is a schematic diagram of an embodiment of a power over ethernet module according to the present utility model.

Reference numerals illustrate:

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The network transformer in the existing Ethernet power supply circuit is generally connected with a power supply module through a center tap, direct current power supply is realized through the center tap, and the coil of the network transformer needs to pass through large current and is thick, so that the network transformer is high in price and large in space volume, and is unfavorable for miniaturization and high density of products.

In order to solve the above problems, the present utility model provides a power over ethernet circuit.

In one embodiment of the present utility model, as shown in fig. 1, the power over ethernet circuit includes:

an ethernet physical layer chip 11 for transmitting and receiving ethernet signals;

A transfer interface 22 for connecting with a power supply terminal device;

a differential line assembly including a primary differential line pair 13 and a secondary differential line pair 23;

A network transformer 12 having a primary coil connected to the ethernet physical layer chip 11 through a primary differential pair 13 and a secondary coil connected to the switching port 22 through a secondary differential pair 23; the network transformer 12 is used for isolating the primary differential line pair 13 and the secondary differential line pair 23;

The power supply module 21 is provided with a power input end and a power output port, the power input end of the power supply module 21 is connected with a power supply, and the power output port of the power supply module 21 is connected with the secondary differential line pair 23; the power supply module 21 is configured to output a dc power source through the secondary differential pair 23 and the adapter 22 to supply power to the powered device.

In this embodiment, the power over ethernet circuit mainly supplies power to the power receiving device, and sends and receives ethernet signals.

In this embodiment, the primary differential pair 13 and the secondary differential pair 23 are two pairs, but in other embodiments, the number of the power receiving end devices and the transmitting and receiving capability of the ethernet physical layer chip 11 may be four.

In this embodiment, the network transformer 12 is used to isolate the primary differential pair 13 from the secondary differential pair 23, i.e., to isolate the front and rear stages of the circuit where the primary differential pair 13 and the secondary differential pair 23 are located. In operation, the ethernet physical layer chip 11 sends an ethernet signal, the primary winding of the network transformer 12 receives the ethernet signal through the primary differential pair 13, and the secondary winding outputs the ethernet signal to the switching port 22 through the secondary differential pair 23, and the switching port 22 sends the ethernet signal to the receiving end device. Similarly, the switching port 22 may also receive the ethernet signal of the receiving end device, and then receive the ethernet signal through the secondary differential line pair 23, the network transformer 12 and the primary differential line pair 13, where the ethernet physical layer chip 11 receives the ethernet signal. In this way, the power over ethernet circuitry completes the transmission of the ethernet signal. In this embodiment, the power supply module 21 outputs a dc power source to supply power to the receiving end device through the secondary differential pair 23 and the adapter 22. Therefore, compared with the prior art, the direct current power supply output by the power supply module does not need to pass through the network transformer 12, namely, the coil of the network transformer 12 in the embodiment does not need to pass through large current, the requirement on the coil is not high, and the network transformer with lower cost can be used. In this embodiment, the transformation ratio of the network transformer 12 may be 1:1.

Since the ethernet signals are ac voltages and the dc power sources are dc voltages, they can be simultaneously transmitted on the secondary differential pair 23 without affecting each other.

In the technical scheme of the utility model, the direct current power supply is directly transmitted to the transfer interface 22 through the secondary differential line pair 23 and is transmitted to the power receiving end equipment to supply power, so that the direct current power supply output by the power supply module does not need to pass through the network transformer 12, namely, the coil of the network transformer 12 does not need to pass through high current, the requirement on the coil is not high, and the network transformer has lower cost and smaller volume. Therefore, the utility model reduces the cost of the Ethernet power supply and is beneficial to miniaturization and high density of products.

Further, in one embodiment of the present utility model, as shown in fig. 2, the power over ethernet circuit further includes a high frequency isolation circuit 24; the power output port of the power supply module 21 is connected with a secondary differential line pair 23 through a high-frequency isolation circuit 24; the high frequency isolation circuit 24 is used to isolate the ethernet signal on the secondary differential pair 23 from entering the power module 21.

It should be noted that, since the ethernet signal is transmitted on the secondary differential line pair 23, the power output port of the power supply module 21 is connected to the secondary differential line pair 23, and thus the ethernet signal may enter the power supply module 21 to cause distortion of the ethernet signal. In the present embodiment, a high-frequency isolation circuit 24 is provided between the power output port of the power supply module 21 and the secondary differential line pair 23, and isolates the ethernet signal from entering the power supply module 21, and the ethernet signal can be transmitted on the secondary differential line pair 23 without distortion.

Further, in an embodiment of the present utility model, as shown in fig. 2, the number of the primary differential line pair 13 and the secondary differential line pair 23 is two, and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module 21 includes a first power output end and a second power output end;

The first power output end of the power supply module 21 is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair 23 through a high-frequency isolation circuit;

the second power output terminal of the power supply module 21 is connected to the first connection line and the second connection line of the other secondary differential line pair 23 through high-frequency isolation circuits, respectively.

In this embodiment, the power output port of the power supply module 21 includes a positive terminal and a negative terminal, the positive terminal of the power supply module 21 forms a positive electrode by connecting one secondary differential line pair 23, the negative terminal forms a negative electrode by connecting the other secondary differential line pair 23, and thus a direct current voltage formed in the two secondary differential line pairs 23 can be transmitted to the receiving terminal device through the transfer port.

Further, in an embodiment of the present utility model, as shown in fig. 2, the high-frequency isolation circuit 24 includes a first inductor L1, a second inductor L2, a third inductor L3, and a fourth inductor L4;

The first power output end of the power supply module 21 is connected with the first connecting wire of one secondary differential wire pair 23 through a first inductor L1 and connected with the second connecting wire of one secondary differential wire pair 23 through a second inductor L2;

The second power output terminal of the power supply module 21 is connected to the first connection line of the other secondary differential line pair 23 through a third inductor L3, and is connected to the second connection line of the other secondary differential line pair 23 through a fourth inductor L4.

It should be noted that, the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 have simple structure, are stable and reliable, and have good function of isolating the ethernet signal from entering the power supply module 21.

The following describes the specific operating principle of the power over ethernet circuit in conjunction with fig. 1 and 2:

In operation, the ethernet physical layer chip 11 sends out an ethernet signal, the ethernet signal is transmitted to the primary winding of the network transformer 12 through the two primary differential line pairs 13, is transmitted to the two secondary differential line pairs 23 through the secondary winding of the network transformer 12, and is transmitted to the switching port 22 through the secondary differential line pairs 23, and the switching port 22 sends the ethernet signal to the receiving end device. Similarly, the switching port 22 may also receive the ethernet signal of the receiving end device, and then receive the ethernet signal through the secondary differential line pair 23, the network transformer 12 and the primary differential line pair 13, where the ethernet physical layer chip 11 receives the ethernet signal. The inductor has the function of isolating high-frequency signals, and the ethernet signals belong to the high-frequency signals, so that the ethernet signals on the secondary differential line pair 23 are isolated by the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4, and cannot enter the power supply module 21, and cannot cause distortion of the ethernet signals.

In operation, the power supply module 21 detects whether the switching port 22 is connected to the receiving end device, and the power supply module 21 outputs a voltage of 2.8V-10V through the power output port, the dc voltage is coupled to the first connection line and the second connection line of one secondary differential line pair 23 through the first inductor L1 and the second inductor L2, and is coupled to the first connection line and the second connection line of the other secondary differential line pair 23 through the third inductor L3 and the fourth inductor L4, so that a voltage is formed between the two differential line pairs, and the dc voltage is transmitted to the receiving end device through the switching port 22. The successful or failed access of the powered device returns different currents through the interface 22, and the power supply module 21 determines whether the powered device exists according to the returned current value.

If the existence of the receiving end device is detected, the power supply module 21 proceeds to the next operation, at this stage, the power supply module 21 forms a voltage between the two differential line pairs by outputting an identification voltage with a voltage magnitude of 15.5V-20.5V at the port, the dc voltage is coupled to the first connection line and the second connection line of one of the secondary differential line pairs 23 through the first inductor L1 and the second inductor L2, and is coupled to the first connection line and the second connection line of the other secondary differential line pair 23 through the third inductor L3 and the fourth inductor L4, and the dc voltage is transmitted to the receiving end device through the transfer port 22. Different powered devices have different electric power requests, and the current returned through the interface 22 is also different, and the power supply module 21 allocates a power class to the powered device according to the returned current value.

It should be noted that ieee802.3af/ieee802.3at/ieee802.3bt is an international extended protocol standard of power over ethernet technology. The IEEE802.3af standard specifies that the dc voltage output from the port is between 44 and 57V, and provides power requests of four Class levels (Class 0 to Class 3) of 3.84 to 12.95W to the powered device. Ieee802.3at specifies that the dc voltage output by the port is between 50 and 57V, and defines a device above 12.95W as Class 4, the power level of the powered device can be extended to 25.5W. The ieee802.3bt standard specifies that the standard Class 5 chip can output 45W of power.

It will be appreciated that different powered end devices (Class 0-Class 5) need to be allocated different power levels, and the power supply module 21 may allocate corresponding power levels according to specific electric power requests.

When the power receiving end device hung under the port is identified to be legal, the power supply module 21 can distribute corresponding power levels according to the returned current value, and the power supply module 21 starts to supply power to the power receiving end device and outputs 48V voltage. The power supply module 21 is coupled to the first connection line and the second connection line of one of the secondary differential line pairs 23 through the first inductor L1 and the second inductor L2, and coupled to the first connection line and the second connection line of the other secondary differential line pair 23 through the third inductor L3 and the fourth inductor L4, forming a voltage between the two differential line pairs; the dc voltage is transmitted to the receiving device through the interface 22.

Based on the above, because the ethernet signal is an ac voltage, the ethernet signal and the dc voltage can be output by superposition with the dc voltage without mutual influence, so that the ethernet signal and the dc voltage are both transmitted to the receiving end device through the two secondary differential line pairs 23 and the switching port 22, and the ethernet power supply is realized. In addition, the direct current voltage output by the power supply module 21 supplies power to the power receiving end device through the two secondary differential line pairs 23, so that the network transformer 12 does not need to pass through large current, the requirement of the network transformer 12 on the coil is not high, for example, the cross-sectional area of the coil can be made smaller, and the network transformer 12 is lower in cost and smaller in size.

In addition, the utility model also provides a power over Ethernet module.

In an embodiment of the present invention, as shown in fig. 3, a power over ethernet module includes:

The main board 10, the main board 10 is provided with an Ethernet physical layer chip 11, a network transformer 12 and a primary differential line pair 13; the network transformer 12 has a primary coil and a secondary coil, the primary coil is connected with the Ethernet physical layer chip 11 through a primary differential line pair 13; an ethernet physical layer chip 11 for transmitting and receiving ethernet signals;

The interface board 20, there are power supply module 21, switching port 22 and secondary differential line pair 23 on the interface board 20; the secondary coil is connected with the switching port 22 through a secondary differential line pair 23; the power supply module 21 has a power input end and a power output port, the power input end of the power supply module 21 is connected with a power supply, and the power output port of the power supply module 21 is connected with the secondary differential line pair 23; the interface 22 is used for connecting a power end device;

a network transformer 12 for isolating the primary differential pair 13 from the secondary differential pair 23;

The power supply module 21 is configured to output a dc power source through the secondary differential pair 23 and the adapter 22 to supply power to the receiving-end device.

It should be noted that, the ethernet physical layer chip 11, the network transformer 12, the power supply module 21, the switching port 22, the primary differential line pair 13 and the secondary differential line pair 23 form a power over ethernet circuit, and the power over ethernet circuit is the same as the power over ethernet circuit in the foregoing embodiments, and reference is made to the foregoing implementation. The ethernet power sourcing module of the present utility model is different from the ethernet power sourcing circuit described above in that the ethernet physical layer chip 11, the network transformer 12 and the primary differential line pair 13 are disposed on the motherboard 10, and the power sourcing module 21, the switching port 22 and the secondary differential line pair 23 are disposed on the interface board 20. Thus, compared with the prior art, the power over ethernet module of the present utility model can save the space of the motherboard 10, and can realize the power over ethernet with the network transformer 12 and the power over ethernet module 21 separated. When power over ethernet is not required, the power module 21 can be removed directly from the interface board 20, and no adjustment of the network transformer 12 on the motherboard 10 is required, which is advantageous for a compatible design.

Further, in an embodiment of the present utility model, as shown in fig. 3, the interface board 20 is further provided with a high-frequency isolation circuit 24; the power output port of the power supply module 21 is connected with a secondary differential line pair 23 through a high-frequency isolation circuit 24; the high frequency isolation circuit 24 is used to isolate the ethernet signal on the secondary differential pair 23 from entering the power module 21.

It should be noted that, the high-frequency isolation circuit 24 is disposed on the interface board 20, which can save the space of the motherboard 10, and is beneficial to compatible design.

Further, in an embodiment of the present utility model, as shown in fig. 3, the number of the primary differential line pairs 13 and the secondary differential line pairs 23 is two, and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module 21 includes a first power output end and a second power output end;

The first power output end of the power supply module 21 is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair 23 through a high-frequency isolation circuit;

the second power output terminal of the power supply module 21 is connected to the first connection line and the second connection line of the other secondary differential line pair 23 through high-frequency isolation circuits, respectively.

It should be noted that, the two primary differential line pairs 13 and the two secondary differential line pairs 23 connect the main board 10 and the interface board 20, so as to complete the transmission of the ethernet signal and supply power to the powered device.

Further, in an embodiment of the present utility model, as shown in fig. 3, the high-frequency isolation circuit 24 includes a first inductor L1, a second inductor L2, a third inductor L3, and a fourth inductor L4;

The first power output end of the power supply module 21 is connected with the first connecting wire of one secondary differential wire pair 23 through a first inductor L1 and connected with the second connecting wire of one secondary differential wire pair 23 through a second inductor L2;

The second power output terminal of the power supply module 21 is connected to the first connection line of the other secondary differential line pair 23 through a third inductor L3, and is connected to the second connection line of the other secondary differential line pair 23 through a fourth inductor L4.

It should be noted that, the interface board 20 adopts an inductor with a simple structure as an isolation circuit to isolate the ethernet signal from entering the power supply module 21, and the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 are convenient to be installed on the interface board 20 and occupy a small space.

The specific working principle of the power over ethernet module is the same as that of the power over ethernet circuit, and will not be described here again. The power over ethernet module of the present utility model is different from the above-mentioned power over ethernet circuit in that, since the ethernet physical layer chip 11, the network transformer 12 and the two primary differential line pairs 13 are disposed on the motherboard 10, and the power supply module 21, the switching port 22, the two secondary differential line pairs 23, the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 are disposed on the interface board 20, the power over ethernet separated by the network transformer 12 and the power supply module 21 is realized, the space of the motherboard is saved, and for high density products, such motherboard 10 is easier to develop hardware, which is beneficial to miniaturization and high density of the products. Moreover, when power over ethernet is not needed, the power supply module 21 and the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 can be directly removed from the interface board 20, and at this time, the network transformer 12 on the motherboard 10 does not need to be adjusted, which is beneficial to compatible design.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (8)

1. A power over ethernet circuit, comprising:

An Ethernet physical layer chip for transmitting and receiving Ethernet signals;

the power supply terminal equipment is connected with the interface;

the differential line assembly comprises a primary differential line pair and a secondary differential line pair;

The network transformer is provided with a primary coil and a secondary coil, the primary coil is connected with the Ethernet physical layer chip through the primary differential line pair, and the secondary coil is connected with the switching port through the secondary differential line pair; the network transformer is used for isolating the primary differential line pair and the secondary differential line pair;

The power supply module is provided with a power input end and a power output port, the power input end of the power supply module is connected with a power supply, and the power output port of the power supply module is connected with the secondary differential line pair; the power supply module is used for outputting a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port.

2. The power over ethernet circuit as recited in claim 1, wherein said power over ethernet circuit further comprises a high frequency isolation circuit; the power output port of the power supply module is connected with the secondary differential line pair through the high-frequency isolation circuit; the high-frequency isolation circuit is used for isolating Ethernet signals on the secondary differential line pair from entering the power supply module.

3. The power over ethernet circuit of claim 2, wherein the number of primary differential line pairs and the number of secondary differential line pairs are two, and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module comprises a first power output end and a second power output end;

The first power output end of the power supply module is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair through the high-frequency isolation circuit;

And the second power output end of the power supply module is respectively connected with the first connecting wire and the second connecting wire of the other secondary differential wire pair through the high-frequency isolation circuit.

4. A power over ethernet circuit as recited in claim 3, wherein said high frequency isolation circuit comprises a first inductor, a second inductor, a third inductor, and a fourth inductor;

The first power output end of the power supply module is connected with a first connecting wire of one secondary differential wire pair through the first inductor and connected with a second connecting wire of one secondary differential wire pair through the second inductor;

The second power output end of the power supply module is connected with the first connecting wire of the other secondary differential wire pair through the third inductor and the second connecting wire of the other secondary differential wire pair through the fourth inductor.

5. A power over ethernet module, comprising:

the main board is provided with an Ethernet physical layer chip, a network transformer and a primary differential line pair; the network transformer is provided with a primary coil and a secondary coil, and the primary coil is connected with the Ethernet physical layer chip through the primary differential line pair; the Ethernet physical layer chip is used for sending and receiving Ethernet signals;

the interface board is provided with a power supply module, a conversion interface and a secondary differential line pair; the secondary coil is connected with the switching port through the secondary differential line pair; the power supply module is provided with a power input end and a power output port, the power input end of the power supply module is connected with a power supply, and the power output port of the power supply module is connected with the secondary differential line pair; the transfer port is used for connecting power receiving end equipment;

the network transformer is used for isolating the primary differential line pair and the secondary differential line pair;

And the power supply module is used for outputting a direct current power supply to supply power to the power receiving end equipment through the secondary differential line pair and the switching port.

6. The power over ethernet module as recited in claim 5, wherein the interface board is further provided with a high frequency isolation circuit; the power output port of the power supply module is connected with the secondary differential line pair through the high-frequency isolation circuit; the high-frequency isolation circuit is used for isolating Ethernet signals on the secondary differential line pair from entering the power supply module.

7. The power over ethernet module as recited in claim 6 wherein the primary differential line pair and the secondary differential line pair are two in number and each differential line pair includes a first connection line and a second connection line;

The power output port of the power supply module comprises a first power output end and a second power output end;

The first power output end of the power supply module is respectively connected with a first connecting wire and a second connecting wire of one secondary differential wire pair through the high-frequency isolation circuit;

And the second power output end of the power supply module is respectively connected with the first connecting wire and the second connecting wire of the other secondary differential wire pair through the high-frequency isolation circuit.

8. The power over ethernet module as recited in claim 7 wherein said high frequency isolation circuit comprises a first inductor, a second inductor, a third inductor and a fourth inductor;

The first power output end of the power supply module is connected with a first connecting wire of one secondary differential wire pair through the first inductor and connected with a second connecting wire of one secondary differential wire pair through the second inductor;

The second power output end of the power supply module is connected with the first connecting wire of the other secondary differential wire pair through the third inductor and the second connecting wire of the other secondary differential wire pair through the fourth inductor.