CN218006271U - POE network port circuit and network equipment - Google Patents
POE network port circuit and network equipment Download PDFInfo
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- CN218006271U CN218006271U CN202222236769.6U CN202222236769U CN218006271U CN 218006271 U CN218006271 U CN 218006271U CN 202222236769 U CN202222236769 U CN 202222236769U CN 218006271 U CN218006271 U CN 218006271U
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Abstract
The utility model relates to a POE net gape circuit and network equipment, POE net gape circuit includes network interface, network transformer, control circuit and impedance circuit, and impedance circuit one end is connected to the center tap of the first winding of network transformer, and the other end is anodal as the POE power for exceed the threshold value at POE supply current, increase impedance in order to restrict POE supply current. At the center tap of POE net gape circuit, the impedance circuit is added to POE power supply positive pole input side promptly, can exceed the threshold value at POE supply current, and increase input impedance is in order to restrict POE supply current to avoid the network transformer to flow through the overcurrent time by burning out.
Description
Technical Field
This application belongs to the network equipment field, especially relates to a POE net gape circuit and network equipment.
Background
At present, when a Power Over Ethernet (POE) system in the market supplies Power, a Power supply is directly connected to a data line for supplying Power, and no related protection function exists. If a pair of differential lines in a certain network cable is connected to the positive electrode and the negative electrode of an external power supply, the differential lines are short-circuited to burn out the signal transformer; or the Power Sourcing Equipment (PSE) end is connected to an external Power supply, and current can flow back into the PSE end to damage the PSE system.
However, in the prior art, reverse connection of the schottky diode to the positive electrode and the negative electrode of the power supply is proposed to solve the problem of device burnout caused by overcurrent, overvoltage and reverse connection when the PSE device is in butt joint, but in practical application, the schottky diode is always burnt out under the condition of reverse connection of polarity, i.e. the problem cannot be completely solved.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide a POE gateway circuit and a network device, which aim to solve at least one of the above problems.
A first aspect of the embodiments of the present application provides a POE gateway circuit, including:
the first network interface comprises a first differential line pair port and a second differential line pair port, and is used for connecting Ethernet equipment so as to transmit electric energy and data;
a network transformer including a first winding and a second winding coupled to the first winding, and a third winding and a fourth winding coupled to the third winding, wherein two ends of the first winding are respectively connected to the first differential line pair ports, and two ends of the third winding are respectively connected to the second differential line pair ports;
the control circuit is provided with a first receiving positive terminal and a first receiving negative terminal which are connected with two ends of the second winding, and a first emitting positive terminal and a first emitting negative terminal which are connected with two ends of the fourth winding; and
impedance circuit, one end is connected to the center tap of first winding, and the other end is anodal as POE power, the center tap of third winding is as POE power negative pole for exceeding the threshold value at POE supply current, increase impedance is in order to restrict POE supply current.
In one embodiment, the impedance circuit comprises a thermistor or a self-healing fuse.
In one embodiment, the power supply further comprises a unidirectional conducting circuit, wherein an input end of the unidirectional conducting circuit is connected to one end of the impedance circuit, and an output end of the unidirectional conducting circuit is connected to a center tap of the first winding.
In one embodiment, the unidirectional conducting circuit includes a diode, and an anode and a cathode of the diode are respectively an input end and an output end of the unidirectional conducting circuit.
In one embodiment, the protection circuit further comprises a first protection circuit and a second protection circuit for short-circuit protection, wherein the first protection circuit is connected between the first end of the first winding and the first port of the first differential line pair in series, and the second protection circuit is connected between the first end of the third winding and the first port of the second differential line pair in series.
In one embodiment, the first protection circuit includes a first capacitor and the second protection circuit includes a second capacitor.
In one embodiment, the system further includes a second network interface and a POE protocol detection module, where the second network interface includes a third differential line pair port and a fourth differential line pair port, and the second network interface is used for POE protocol detection;
the network transformer further comprises a fifth winding, a sixth winding coupled with the fifth winding, a seventh winding and an eighth winding coupled with the seventh winding, wherein two ends of the fifth winding are respectively connected to the ports of the third differential line pair, two ends of the seventh winding are respectively connected to the ports of the fourth differential line pair, the control circuit further comprises a second receiving positive terminal and a second receiving negative terminal which are respectively connected with two ends of the sixth winding, and a second transmitting positive terminal and a second transmitting negative terminal which are respectively connected with two ends of the eighth winding;
and the POE protocol detection module is connected with the second network interface, the center tap of the fifth winding and the center tap of the seventh winding and is used for detecting the power supply protocol standard and the voltage of the POE equipment to be detected, which is accessed by the second network interface.
In one embodiment, the protection circuit further comprises a third protection circuit and a fourth protection circuit for short-circuit protection, the third protection circuit is connected in series between the first end of the fifth winding and the first port of the third differential line pair, and the fourth protection circuit is connected in series between the first end of the seventh winding and the first port of the fourth differential line pair.
In one embodiment, the third protection circuit includes a third capacitor and the fourth protection circuit includes a fourth capacitor.
A second aspect of the embodiments of the present application provides a network device, including the foregoing POE gateway circuit.
Compared with the prior art, the embodiment of the application has the advantages that: the center tap of the network transformer in the POE network port circuit, namely the impedance circuit is added on the positive input side of the POE power supply, so that the power supply current can exceed the threshold value, the input impedance is increased to limit the POE power supply current, and the network transformer is prevented from being burnt when the current flowing through the network transformer is too large.
Drawings
Fig. 1 is a schematic diagram of a POE gateway circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a POE gateway circuit according to another embodiment of the present application;
fig. 3 is a schematic circuit diagram of a network device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation as a limitation of the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, an embodiment of the present application provides a POE gateway circuit, which can be applied to a network device, such as a router or a switch, to protect the network device from overcurrent, overvoltage, or reverse connection.
The POE network port circuit in the first embodiment of the present application includes a first network interface 110, a network transformer 120, a control circuit 130, and an impedance circuit 140.
The first network interface 110 may be an interface of RJ45 specification, or a first network interface 110 of other specifications, where the first network interface includes at least two pairs of differential line pair ports, and based on the POE network circuit, the network transformer 120 is often required to be adapted to the two pairs of differential line pair ports to transmit POE power supply current. Therefore, the embodiment is described with two corresponding pairs of differential pair ports as an example, and includes first differential pair ports 1 and 2 and second differential pair ports 3 and 6.
The first network interface 110 is used to connect ethernet devices for transmitting power and data. Generally, the first network interface 110 is used as a LAN interface for connecting ethernet devices, such as routers, switches, etc.; when the first network interface 110 is used as the POE output interface, stable power and data transmission is provided for POE powered devices, such as a network camera, through a network cable. The supply voltage is for example 53.5V.
The network transformer 120 includes a first winding and a second winding coupled to the first winding, and a third winding and a fourth winding coupled to the third winding, both ends of the first winding are respectively connected to the first differential line pair ports 1, 2, and both ends of the third winding are respectively connected to the second differential line pair ports 3, 6.
In one example, the first winding is a primary winding and the second winding is a secondary winding; the third winding is a primary winding, and the fourth winding is a secondary winding. The two ends of the winding of the network transformer 120 are used for transmitting network signals of the differential line pair, and communicate with the external device of the first network interface 110. The first winding has a center tap CT1 for transmitting POE supply current, and the third winding has a center tap CT2 for transmitting POE supply current.
The control circuit 130 has a first receiving positive terminal RX1+, a first receiving negative terminal RX 1-at both ends of the second winding, and a first transmitting positive terminal TX1+, a first transmitting negative terminal TX 1-at both ends of the fourth winding, the control circuit 130 is, for example, a controller CPU, and the control circuit 130 is connected to the network transformer 120 for communicating with the external device through the network transformer 120 and the first network interface 110.
One end of the impedance circuit 140 is connected to the center tap CT1 of the first winding, and the other end of the impedance circuit 140 serves as POE power supply positive electrode POE + for increasing the impedance to limit the POE power supply current when the POE power supply current exceeds a threshold, and the center tap CT2 of the third winding serves as POE power supply negative electrode POE-.
For example, the impedance circuit 140 includes a thermistor PTC, and when the POE supply current is greater than the trigger current of the thermistor PTC, the resistance of the thermistor PTC increases, so that the POE supply current decreases and even cuts off the input, so as to protect the network transformer 120. As another example, the impedance circuit 140 includes a self-healing fuse or a current limiting chip.
POE net gape circuit in this application second embodiment still includes unidirectional flux circuit 150, and unidirectional flux circuit 150's input is connected to the one end of impedance circuit 140, and unidirectional flux circuit 150's output is connected to the center-tapped CT1 of first winding. The POE power supply device is used for preventing the POE power supply positive pole POE + and the POE power negative pole POE from being connected with the POE power supply with opposite polarity, and preventing the POE network port circuit from being reversely filled by POE power supply current, so that the equipment is damaged or burnt.
In one embodiment, the unidirectional conducting circuit 150 includes a diode D1, and an anode and a cathode of the diode D1 are an input end and an output end of the unidirectional conducting circuit 150, respectively.
The POE mesh port circuit in the third embodiment of the present application further includes a first protection circuit 162 for short-circuit protection, and the first protection circuit 162 is connected in series between the first end of the first winding and the first port 1 of the first differential line pair port 1, 2. A second protection circuit 164 for short circuit protection is also included, the second protection circuit 164 being connected in series between the first end of the third winding and the first port 3 of the second differential pair port 3, 6. The method is used for solving the problem that the ports 1 and 2 of the first differential line pair or the ports 3 and 6 of the second differential line pair are burnt out by short circuit when the network line sequence of the first network interface 110 is wrongly connected and the power supply anode and cathode of the PSE device are directly connected.
For example, the first protection circuit 162 includes a first capacitor C1, and the second protection circuit 164 includes a second capacitor C2, and the capacitors can play a role in blocking direct current and direct current, and can transmit an alternating current communication signal, and cut off a direct current POE supply current, and play a role in protecting the network device.
Referring to fig. 2, optionally, the POE gateway circuit further includes a second network interface 170 and a POE protocol detection module 180, where the second network interface 170 includes third differential line pair ports 11 and 12 and fourth differential line pair ports 13 and 16, and the second network interface 170 is used for POE protocol detection;
the network transformer 120 further includes a fifth winding and a sixth winding coupled to the fifth winding, and a seventh winding and an eighth winding coupled to the seventh winding, both ends of the fifth winding are respectively connected to the third differential line pair ports 11 and 12, and both ends of the seventh winding are respectively connected to the fourth differential line pair ports 13 and 16. In one example, the fifth winding is a primary winding and the sixth winding is a secondary winding; the seventh winding is a primary winding, and the eighth winding is a secondary winding. The two ends of the winding of the network transformer 120 are used for transmitting the network signal of the differential line pair, and communicate with the external device of the second network interface 170.
The control circuit 130 further includes a second receiving positive terminal RX2+, a second receiving negative terminal RX2-, and a second transmitting positive terminal TX2+, a second transmitting negative terminal TX2-, connected to both ends of the sixth winding.
The POE protocol detection module 180 is connected to the second network interface 170, the center tap CT3 of the fifth winding, and the center tap CT4 of the seventh winding, and is configured to detect a power supply protocol standard and a voltage of the POE device to be tested, which is accessed by the second network interface 170. Generally, the second network interface 170 is used only for testing and is not used for network communication.
Optionally, the POE mesh circuit further includes a third protection circuit 166 and a fourth protection circuit 168 for short-circuit protection, the third protection circuit 166 is connected in series between the first end of the fifth winding and the first port 11 of the third differential line pair port 11, 12, and the fourth protection circuit 168 is connected in series between the first end of the seventh winding and the first port 13 of the fourth differential line pair port 13, 16. The method and the device are used for solving the problem that the ports 11 and 12 of the third differential line pair or the ports 13 and 16 of the fourth differential line pair are burnt out by short circuit when the network line sequence of the second network interface 170 is mistakenly connected and the anode and the cathode of the power supply of the POE device to be tested are directly connected.
The third protection circuit 166 includes a third capacitor C3 and the fourth protection circuit 168 includes a fourth capacitor C4. The capacitor can play a role in blocking direct current and alternating current, can transmit alternating-current communication signals, and cuts off direct-current transmission of the POE equipment to be tested, so that the function of protecting network equipment is played.
Referring to fig. 3, a second aspect of the embodiment of the present application provides that the network device includes the POE gateway circuit. The POE network port circuit can play roles in preventing short circuit, reverse connection, overcurrent and the like on network equipment, and the reliability of the network equipment is improved.
Optionally, the network Device is further provided with a battery, a DC-DC circuit connected to the battery for voltage conversion, and a PSE module connected to the DC-DC circuit for detecting, classifying, supplying or powering off an external Power Device (PD Device). The DC-DC circuit is also connected with a control circuit 130 of the POE network port circuit, and the control circuit 130 controls the voltage conversion of the DC-DC circuit; the PSE module will be connected to the above-mentioned POE power supply positive POE +, POE power supply negative POE-, and also be used to provide the above-mentioned POE power supply current.
Optionally, the network device is further provided with a direct current output interface, and the direct current output interface is connected to an output of the DC-DC circuit or an output of the PSE module and is used for providing a stable power supply voltage to the outside.
Optionally, the network device is further provided with a dc detection interface for detecting a voltage of the power supply.
The network equipment can be used as a portable multifunctional security tester and can be used for solving the problems encountered in security monitoring and installation engineering. For example, when a camera is installed, power can be supplied through a security tester, the use performance can be tested, and monitoring pictures can be previewed and various parameters can be set. The tester has the advantages of small and exquisite shell body, long endurance, convenience in carrying and higher construction efficiency.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A POE network port circuit, comprising:
the first network interface comprises a first differential line pair port and a second differential line pair port, and is used for connecting Ethernet equipment so as to transmit electric energy and data;
the network transformer comprises a first winding, a second winding coupled with the first winding, a third winding and a fourth winding coupled with the third winding, wherein two ends of the first winding are respectively connected to the ports of the first differential line pair, and two ends of the third winding are respectively connected to the ports of the second differential line pair;
the control circuit is provided with a first receiving positive terminal and a first receiving negative terminal which are connected with two ends of the second winding, and a first emitting positive terminal and a first emitting negative terminal which are connected with two ends of the fourth winding; and
impedance circuit, one end is connected to the center tap of first winding, and the other end is anodal as POE power, the center tap of third winding is as POE power negative pole for when POE supply current surpassed the threshold value, increase impedance in order to restrict POE supply current.
2. The POE gateway circuit of claim 1, wherein said impedance circuit comprises a thermistor or a self-healing fuse.
3. The POE network port circuit of claim 1, further comprising a unidirectional conducting circuit having an input connected to one end of said impedance circuit and an output connected to a center tap of said first winding.
4. The POE network port circuit as recited in claim 3, wherein the unidirectional conduction circuit comprises a diode, and the anode and the cathode of the diode are respectively an input end and an output end of the unidirectional conduction circuit.
5. The POE mesh circuit of claim 1, further comprising a first protection circuit and a second protection circuit for short circuit protection, the first protection circuit being connected in series between the first end of the first winding and the first port of the first differential pair port, the second protection circuit being connected in series between the first end of the third winding and the first port of the second differential pair port.
6. The POE gateway circuit of claim 5, wherein the first protection circuit comprises a first capacitor and the second protection circuit comprises a second capacitor.
7. The POE mesh circuit of any one of claims 1 to 6, further comprising a second network interface and a POE protocol detection module, wherein the second network interface comprises a third differential line pair port and a fourth differential line pair port, and wherein the second network interface is used for POE protocol detection;
the network transformer further comprises a fifth winding, a sixth winding coupled with the fifth winding, a seventh winding and an eighth winding coupled with the seventh winding, wherein two ends of the fifth winding are respectively connected to the ports of the third differential line pair, two ends of the seventh winding are respectively connected to the ports of the fourth differential line pair, the control circuit further comprises a second receiving positive terminal and a second receiving negative terminal which are respectively connected with two ends of the sixth winding, and a second transmitting positive terminal and a second transmitting negative terminal which are respectively connected with two ends of the eighth winding;
and the POE protocol detection module is connected with the second network interface, the center tap of the fifth winding and the center tap of the seventh winding and is used for detecting the power supply protocol standard and the voltage of the POE equipment to be detected, which is accessed by the second network interface.
8. The POE mesh circuit of claim 7, further comprising a third protection circuit and a fourth protection circuit for short circuit protection, the third protection circuit being connected in series between the first end of the fifth winding and the first port of the third differential pair port, the fourth protection circuit being connected in series between the first end of the seventh winding and the first port of the fourth differential pair port.
9. The POE gateway circuit of claim 8, wherein said third protection circuit comprises a third capacitor and said fourth protection circuit comprises a fourth capacitor.
10. A network device comprising the POE gateway circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222236769.6U CN218006271U (en) | 2022-08-23 | 2022-08-23 | POE network port circuit and network equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222236769.6U CN218006271U (en) | 2022-08-23 | 2022-08-23 | POE network port circuit and network equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218006271U true CN218006271U (en) | 2022-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222236769.6U Active CN218006271U (en) | 2022-08-23 | 2022-08-23 | POE network port circuit and network equipment |
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|---|---|
| CN (1) | CN218006271U (en) |
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- 2022-08-23 CN CN202222236769.6U patent/CN218006271U/en active Active
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