CN102842903A - Power over Ethernet system and surge protection device thereof - Google Patents
Power over Ethernet system and surge protection device thereof Download PDFInfo
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- CN102842903A CN102842903A CN2012103341672A CN201210334167A CN102842903A CN 102842903 A CN102842903 A CN 102842903A CN 2012103341672 A CN2012103341672 A CN 2012103341672A CN 201210334167 A CN201210334167 A CN 201210334167A CN 102842903 A CN102842903 A CN 102842903A
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Abstract
The invention discloses a power over Ethernet (POE) system and a surge protection device thereof. The POE system comprises a POE power supply device, a diode (D1), a diode (D2), a transient voltage suppression device (D3) and common mode energy discharge devices (D4) and (D5), wherein the POE power supply device is used for providing a power supply and outputting a positive phase power supply terminal and a negative phase power supply terminal; one of the power supply terminals is connected with a switch device; a POE control chip controls the on/off of the switch device; the positive electrode of the D1 is connected with the negative phase power supply terminal of the POE system and the negative electrode of the D1 is connected with the power supply high-voltage terminal of the POE system; the negative electrode of the D2 is connected with the negative phase power supply terminal of the POE system and the positive electrode of the D2 is connected with the power supply low-voltage terminal of the POE system; and the D4 and the D5 are connected between the power supply low-voltage terminal and the grounding terminal as well as between the power supply high-voltage terminal and the grounding terminal respectively. By the POE system and the surge protection device thereof, surge protection can be realized, the integration level of the system can be increased and the hardware cost can be reduced.
Description
Technical field
The application relates to the circuit protection technical field, relates in particular to a kind of POE (POE, Power over ethernet) system and surge protective device thereof.
Background technology
Along with the development of information technology, excited the demand of people to the information transmission technology.People require to insert the Internet at any time, anywhere fast, and this just welcomes the very big demand of the wireless networking of 3G.Simultaneously, people also need be in the far-end image data, and can receive data in real time.In order to satisfy the demand, industry adopts the POE system to solve the problem of transmission of remote equipment real time data acquisition and far end system power supply simultaneously usually at present.
The POE system refers under the situation that existing Ethernet wiring architecture is not done to change; Be some Network Based between the interconnection agreement (IP; Internet Protocol) terminal; Like IP phone machine, wireless local network connecting point (AP), web camera etc., in the time of transmission of data signals, kind equipment provides the technology of direct current supply for this reason.The POE technology can guarantee the normal operation of existing network when guaranteeing existing structure wiring safety, reduce cost to greatest extent.
But the POE system usually need spread line out of doors with the ether twisted pair network cable and connect, and the POE communication equipment is a weak electricity system.Therefore the POE system is easy to receive that extraneous surge interference causes system continuous firing perhaps not cause expendable damage.These surges disturb and comprise like interference such as thunderbolt, automobile discharges.For avoiding these to disturb,, still there is part POE equipment under the thunderbolt environment, to be difficult to escape death by sheer luck though announced in the existing P OE standard technique that some POE systems resist the standard that surge disturbs.
Be two kinds of main technical scheme of the anti-interference resist technology of present POE system below.
Prior art one:
Fig. 1 is the circuit diagram of the anti-interference resist technology of the described POE of prior art one system.Referring to Fig. 1, this technical scheme directly is provided with a protective circuit 101 at said POE control chip and POE feeder ear (being the RJ45 joint shown in Fig. 1).This protective circuit 101 adopts the mode of three-level protective to realize.Wherein, piezo-resistance RV1, RV2 and RV3 bleed off significant amount of energy are adopted in first order protection; Second level protection adopts inductance L 1 and L2 to stop the high-frequency current energy; Third level protection adopts Transient Voltage Suppressor (TVS, Transient Voltage Suppressor) like VD1, VD2, the remaining surge energy of VD3 bleed off.
But; This technical scheme of prior art one adopts complicated three-level protective circuit; Not only components and parts are more, and all devices in the said three-level protective circuit all can't be shared by all the POE power supply ports in the POE system, and overlap POE power supply port needs many cover protective circuits more; Therefore cause the integrated level of POE electric power system lower, cost is higher.
Prior art two:
Fig. 2 is the circuit diagram of the anti-interference resist technology of the described POE of prior art two system.Referring to Fig. 2, this technical scheme is mainly used in the protection of POE cross-over connection electric power system, promptly between the input RJ45 interface of the RJ45 interface of POE electric power system output and far-end, protective circuit 201 is set.As shown in the figure, the concrete mode that adopts piezo-resistance, TVS pipe, semiconductor discharge tube and inductor combination is protected between POE power supply output and input and to the protection of POE electric power system in the said protective circuit 201.
But; The number of devices of above-mentioned prior art two described protective circuits is more; And all devices can't be by each power supply ports share in the POE system; Need a protective circuit be set in each output port outside correspondence of POE electric power system, therefore cause the integrated level of POE electric power system lower, cost is higher.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of POE system and surge protective device thereof, with when realization is carried out surge protection to the POE system, improves level of integrated system, reduces hardware cost.
Technical scheme of the present invention is achieved in that
The surge protective device of a kind of POE POE system comprises:
Diode D1, the negative feeder ear of the said POE of its anodal connection system, negative pole connects the power supply high-pressure side of POE system;
Diode D2, its negative pole connect the negative feeder ear of said POE system, the anodal power supply low-pressure end that connects the POE system;
Transient Voltage Suppressor spare D3, its negative pole connect the power supply high-pressure side of said POE system, the anodal power supply low-pressure end that connects said POE system;
The common mode energy device D4 that releases is connected between the power supply low-pressure end and earth terminal of said POE system;
The common mode energy device D5 that releases is connected between the power supply high-pressure side and earth terminal of said POE system.
In a kind of optimal way, this device further comprises:
Semiconductor discharge tube D6 is connected between the negative feeder ear and earth terminal of said POE system.
In a kind of optimal way, this device further comprises: protective tube, be connected on the negative feeder ear of said POE system, and the operating current of this protective tube is greater than the running current of said POE system negative feeder ear.
In a kind of optimal way, the voltage of voltage regulation of said Transient Voltage Suppressor spare D3 is greater than the POE control chip maximum working voltage in the said POE system, less than the minimum damage voltage of the POE control chip in the said POE system.
In a kind of optimal way, the said common mode energy device D4 that releases is a piezo-resistance, and the said common mode energy device D5 that releases also is piezo-resistance.
In a kind of optimal way, the said common mode energy device D4 that releases is a Transient Voltage Suppressor spare, and the positive pole of this Transient Voltage Suppressor spare connects the power supply low-pressure end of said POE system, and negative pole connects said earth terminal; The said common mode energy device D5 that releases is a semiconductor discharge tube.
A kind of POE system comprises:
The POE electric supply installation is used to insert the power supply of POE, and exports positive feeder ear and negative feeder ear, is connected with switching device on one of them feeder ear, comprises in this POE electric supply installation that the POE control chip is to control opening and closure of this switching device;
This POE system also comprises surge protective device, and this surge protective device comprises:
Diode D1, the negative feeder ear of the said POE of its anodal connection system, negative pole connects the power supply high-pressure side of POE system;
Diode D2, its negative pole connect the negative feeder ear of said POE system, the anodal power supply low-pressure end that connects the POE system;
Transient Voltage Suppressor spare D3, its negative pole connect the power supply high-pressure side of said POE system, the anodal power supply low-pressure end that connects said POE system;
The common mode energy device D4 that releases is connected between the power supply low-pressure end and earth terminal of said POE system;
The common mode energy device D5 that releases is connected between the power supply high-pressure side and earth terminal of said POE system.
In a kind of optimal way, said surge protective device further comprises: semiconductor discharge tube D6 is connected between the power supply control end and earth terminal of said POE system.
In a kind of optimal way, said surge protective device further comprises: protective tube, be connected on the power supply control end of said POE system, and the operating current of this protective tube is greater than the running current of said POE system power supply control end.
In a kind of optimal way, the voltage of voltage regulation of said Transient Voltage Suppressor spare D3 is greater than the POE control chip maximum working voltage in the said POE system, less than the minimum damage voltage of the POE control chip in the said POE system.
Compared with prior art; Surge protective device of the present invention both can have been realized the protection to the surge interference of POE control device; Has only simultaneously the direct-connected related device of negative feeder ear in the scheme of the present invention with said POE system; Like diode D1 and D2 and further additional semiconductor discharge tube D6 and series connection protective tube FU; Can not be shared by all feeder ears, and other device such as Transient Voltage Suppressor spare D3, common mode energy device D4, the common mode energy device D5 that releases that releases can be shared by all feeder ears of POE system, for many cover POE power supply ports only needs one overlap Transient Voltage Suppressor spare D3, common mode energy device D4, the common mode energy device D5 that releases that releases and get final product; So relative prior art of the present invention; Can improve the device integrated level, reduce the overall quantity of the device in the surge protective device, thereby reduced hardware cost.
Description of drawings
Fig. 1 is the circuit diagram of the anti-interference resist technology of the described POE of prior art one system;
Fig. 2 is the circuit diagram of the anti-interference resist technology of the described POE of prior art two system;
Fig. 3 is the circuit diagram of the general POE electric supply installation of a kind of POE system;
Fig. 4 is the circuit diagram of a kind of embodiment of POE system according to the invention and surge protective device thereof;
Fig. 5 is the circuit diagram of another embodiment of POE system according to the invention and surge protective device thereof;
Fig. 6 is the circuit diagram of another embodiment of POE system according to the invention and surge protective device thereof;
Fig. 7 is the circuit diagram of another embodiment of POE system according to the invention and surge protective device thereof.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.
Fig. 3 is the circuit diagram of the general POE electric supply installation of a kind of POE system.Referring to Fig. 3, this POE electric supply installation need insert the POE power supply, and for example the POE power supply is 48V, and this POE electric supply installation will be exported the receiving end equipment (PD, Powered Device) that two feeder ears are given the POE system.Said PD equipment is the load equipment of accepting power supply; It is the client device of POE system; Like IP phone, network security video camera, AP and many other ethernet devices such as palmtop PC (PDA) or charger for mobile phone, the feeder ear that the POE system can pass through to be exported is to the PD power devices.
Two feeder ears of said POE electric supply installation output are respectively positive feeder ear (POE_P) and negative feeder ear (POE_N); One of them feeder ear is the power supply control end; For example the power supply control end in the example shown in Fig. 3 is said negative feeder ear, and the high-pressure side that said positive feeder ear directly is connected said POE power supply is the 48V voltage end.Said power supply control end is that the negative feeder ear need connect switching device; Switching device Q1 as shown in Figure 3 is chip controls metal-oxide semiconductor fieldeffect transistor (MOS FET; Metal-Oxide-Semiconductor Filed Effect Transisitor); This switching device of POE control chip U1 control Q1 in this POE electric supply installation opens and closure, thereby realizes the power supply control to the POE feeder ear.Scheme according to chip producer is different, and some POE control chip is integrated in chip internal with MOS FET, and some then is placed on the POE chip exterior.For this dual mode, the present invention can be suitable for.In addition, the resistance R sense in the POE system is used for the actual power power of detection system.
The circuit of POE electric supply installation shown in Figure 3 is the general operating circuit of POE system.Because it is outdoor that the supply line of POE system usually is exposed at, receive that easily surge disturbs.And a little less than said U1 and Q1 be highly brittle, damaged by thunder and lightning easily, so surge protective device need further be set.
Fig. 4 is the circuit diagram of a kind of embodiment of POE system according to the invention and surge protective device thereof.Referring to Fig. 4, in this embodiment, said surge protective device comprises:
Diode D1, the positive pole of this diode D1 connects the negative feeder ear, and the negative pole of this diode D1 connects the power supply high-pressure side (for example being the 48V voltage end) of POE system here.
Diode D2, the negative pole of this diode D2 connect the negative feeder ear of said POE system, the anodal power supply low-pressure end (for example here being the 0V voltage end) that connects the POE system.
Transient Voltage Suppressor spare (TVS; Transient Voltage Suppressor) D3; Be connected between the high-pressure side (48V) and low-pressure end (0V) of power supply of said POE system, this Transient Voltage Suppressor spare D3 can realize the voltage stabilizing between the high low-voltage end of POE control chip.
The common mode energy device D4 that releases is connected between the power supply low-pressure end and earth terminal of said POE system.
The common mode energy device D5 that releases is connected between the power supply high-pressure side and earth terminal of said POE system.
Said earth terminal is connected to the earth or metal chassis, and release device D4 and D5 of said common mode energy can provide the path of the common mode energy of releasing, with the common mode disturbances energy of releasing between said power supply low-pressure end, high-pressure side and the earth terminal.In the present embodiment, the said common mode energy device D4 that releases is a piezo-resistance, and the said common mode energy device D5 that releases also is a piezo-resistance.
Adopt technical scheme of the present invention, when the negative feeder ear of POE system received the interference of surges such as thunderbolt, if lightning voltage is a positive electricity, then surge current flow to the earth through D5 again from D1, thereby releases surge energy, realizes the protection to U1 and Q1; If lightning voltage is a negative electricity, then surge current flows to the negative feeder ear from the earth through D4 and D2, thereby releases surge energy, realizes the protection to U1 and Q1.
When the positive feeder ear of POE system received the interference of surges such as thunderbolt, if lightning voltage is a positive electricity, then surge current flow to the earth from D5, thereby releases surge energy, realizes the protection to U1 and Q1; If lightning voltage is a negative electricity, then surge current flows to the positive feeder ear from the earth through D5, thereby releases surge energy, realizes the protection to U1 and Q1.
In a word, through technical scheme of the present invention, the voltage clamp of negative feeder ear (POE_N) of feeder ear that can make the POE system between 48V and 0V, thereby protect said POE control device (comprising control chip U1 and MOS FET) not to be damaged.
The voltage of voltage regulation of said Transient Voltage Suppressor spare D3 is greater than the POE control chip maximum working voltage in the said POE system; Minimum damage voltage less than the POE control chip in the said POE system; To guarantee when surges such as thunderbolt disturb; Voltage fluctuation between two power ends of said POE power supply (being 48V and 0V) is no more than the operating voltage range of said POE control chip U1, thereby can further protect the POE control chip.Said minimum damage voltage is meant the minimum voltage that possibly damage said POE control chip, and this minimum damage voltage is the property value that dispatches from the factory of POE control chip.
Fig. 5 is the circuit diagram of another embodiment of POE system according to the invention and surge protective device thereof.As shown in Figure 5, in this embodiment, can also go up series connection protective tube FU at negative feeder ear (POE_N), the operating current of this protective tube need be greater than the running current of said POE system negative feeder ear.At said negative feeder ear series connection protective tube, after can damaging at the circuit of POE electric supply installation, effectively prevent to damage circularly the ether circuit and the opposite end PD equipment that are attached thereto.
In addition; Among this embodiment; Said protective device can also be according to the grade of the resistance surge energy of the antijamming capability of control chip and system, for example when the antijamming capability of control chip is more weak or the grade of the surge energy that needs to resist when higher, can optionally add semiconductor discharge tube D6; Can further increase the path of the surge interfering energy of releasing, further improve protective capability said POE control device.
Simultaneously; In the embodiment shown in fig. 5; After adding the above semiconductor discharge tube D6; Device D5 adopts piezo-resistance because said common mode energy is released, and therefore can also cause said semiconductor discharge tube D6 and common mode energy to release the piezo-resistance while conducting of device D5 when releasing energy receiving thunderbolt, and said surge protective device can not burnt out yet.
Certainly, in a further embodiment, saidly go up series connection protective tube FU and said interpolation semiconductor discharge tube D6 also can choose one of which wantonly at negative feeder ear (POE_N).
Fig. 6 is the circuit diagram of another embodiment of POE system according to the invention and surge protective device thereof.Referring to Fig. 6; This embodiment and embodiment shown in Figure 4 are basic identical; Difference is, among the embodiment shown in Figure 6, the said common mode energy device D4 that releases is Transient Voltage Suppressor spare (TVS); The positive pole of this Transient Voltage Suppressor spare connects the power supply low-pressure end of said POE system, and negative pole connects said earth terminal.The said common mode energy device (D5) of releasing is the semiconductor discharge tube.Utilize this device, can provide equally the surge energy path of the earth of releasing, and the common mode disturbances energy between said power supply low-pressure end, high-pressure side and the earth terminal of can releasing.
On basis embodiment illustrated in fig. 6, the present invention can also go up series connection protective tube FU and/or between the negative feeder ear of said POE system and earth terminal, connect semiconductor discharge tube D6 at negative feeder ear (POE_N), and is as shown in Figure 7.
Among above-mentioned each embodiment; Thereby the function of the surge energy protection POE control device of releasing except can realize that surge disturbs the time simultaneously, has only the direct-connected related device of negative feeder ear with said POE system among said each embodiment; Like diode D1 and D2 and further additional semiconductor discharge tube D6 and series connection protective tube FU; Can not be shared by all feeder ears, and other device such as Transient Voltage Suppressor spare D3, common mode energy device D4, the common mode energy device D5 that releases that releases can be shared by all feeder ears of POE system, so the relative prior art of the present invention; Can improve the device integrated level; Reduce the overall quantity of the device in the surge protective device, saved the space of surge protective device, reduced hardware cost.
In addition; The present invention adopts same printed circuit board (PCB; PrintedCircuitBoard), can realize the POE port protection of lower cost according to the applied environment of system and the parameter of resisting the grade selection different circuits device of lightning surge energy.Simultaneously, select the suitable devices parameter, can make different antijamming capability POE chips be effectively protected.
For example, in such as above-mentioned Fig. 4 and the embodiment that does not add semiconductor discharge tube D6 shown in Figure 6, actual size of resisting surge energy depends on conveyance capacity and the response speed of D1, D2, D3, D4, D5 and the antijamming capability of U1 and Q1 self.In the actual test, can resist surge energy greater than ± 4KV.
If it is indoor that equipment only only is used in, common mode disturbances possibly only need full test ± 2KV, and DM EMI only needs full test ± 1KV or do not test.This moment, perhaps the transient current of the common mode energy of D2 and D4 had only 20A, can adopt other device of corresponding parametric degree through said D1 and D5.For example D1, D2 adopt common rectifier diode (like M7); The piezo-resistance that can adopt 100A if D4 and D5 adopt piezo-resistance is (but because the piezo-resistance self character; Preferably select the piezo-resistance of big slightly conveyance capacity); Again because the 48V power domain has the effect of electric capacity charging, discharge, the electric current of D3 can be greater than 40A, so D3 can use the TVS pipe of SMA.
If actual test shows U1, Q1, and Rsnece is damaged easily, then can change D1, D2 is a fast diode, perhaps the diode of low pressure differential can well be protected the POE circuit.
If equipment then needs test ± 4KV with out of doors, waveform is 10/700us even bigger surge energy.Need change D1, D2, D3 and D4 and D5 into conveyance capacity bigger device this moment.In order to improve the number of times that anti-thunderbolt is disturbed, can adopt many D4 and D5 parallel connection to use simultaneously.
When needs are tested large disturbance voltage more or bigger interfering energy, can weld D6 simultaneously, like Fig. 5 and shown in Figure 7, be used to share D1, D2, D3, RV1, RV2, D4, the last electric current of D5.
Experiment showed, that technical scheme of the present invention disturbs under the surge interference with 1.5KV10/700us at the common mode surge of 4KV 10/700us, the POE system can continuous firing, is not damaged.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (10)
1. the surge protective device of a POE POE system is characterized in that, comprising:
Diode (D1), the negative feeder ear of the said POE of its anodal connection system, negative pole connects the power supply high-pressure side of POE system;
Diode (D2), its negative pole connect the negative feeder ear of said POE system, the anodal power supply low-pressure end that connects the POE system;
Transient Voltage Suppressor spare (D3), its negative pole connect the power supply high-pressure side of said POE system, the anodal power supply low-pressure end that connects said POE system;
The common mode energy device (D4) of releasing is connected between the power supply low-pressure end and earth terminal of said POE system;
The common mode energy device (D5) of releasing is connected between the power supply high-pressure side and earth terminal of said POE system.
2. surge protective device according to claim 1 is characterized in that, this device further comprises:
Semiconductor discharge tube (D6) is connected between the negative feeder ear and earth terminal of said POE system.
3. surge protective device according to claim 1 is characterized in that, this device further comprises:
Protective tube is connected on the negative feeder ear of said POE system, and the operating current of this protective tube is greater than the running current of said POE system negative feeder ear.
4. according to each described surge protective device of claim 1 to 3; It is characterized in that; The voltage of voltage regulation of said Transient Voltage Suppressor spare (D3) is greater than the POE control chip maximum working voltage in the said POE system, less than the minimum damage voltage of the POE control chip in the said POE system.
5. according to each described surge protective device of claim 1 to 3, it is characterized in that said common mode energy is released device (D4) for piezo-resistance, the said common mode energy device (D5) of releasing also is piezo-resistance.
6. according to each described surge protective device of claim 1 to 3; It is characterized in that; The said common mode energy device (D4) of releasing is a Transient Voltage Suppressor spare, and the positive pole of this Transient Voltage Suppressor spare connects the power supply low-pressure end of said POE system, and negative pole connects said earth terminal; The said common mode energy device (D5) of releasing is a semiconductor discharge tube.
7. a POE system is characterized in that, comprising:
The POE electric supply installation is used to insert the power supply of POE, and exports positive feeder ear and negative feeder ear, is connected with switching device on one of them feeder ear, comprises in this POE electric supply installation that the POE control chip is to control opening and closure of this switching device;
This POE system also comprises surge protective device, and this surge protective device comprises:
Diode (D1), the negative feeder ear of the said POE of its anodal connection system, negative pole connects the power supply high-pressure side of POE system;
Diode (D2), its negative pole connect the negative feeder ear of said POE system, the anodal power supply low-pressure end that connects the POE system;
Transient Voltage Suppressor spare (D3), its negative pole connect the power supply high-pressure side of said POE system, the anodal power supply low-pressure end that connects said POE system;
The common mode energy device (D4) of releasing is connected between the power supply low-pressure end and earth terminal of said POE system;
The common mode energy device (D5) of releasing is connected between the power supply high-pressure side and earth terminal of said POE system.
8. POE according to claim 7 system is characterized in that said surge protective device further comprises:
Semiconductor discharge tube (D6) is connected between the power supply control end and earth terminal of said POE system.
9. POE according to claim 7 system is characterized in that said surge protective device further comprises:
Protective tube is connected on the power supply control end of said POE system, and the operating current of this protective tube is greater than the running current of said POE system power supply control end.
10. according to each described POE system of claim 7 to 9; It is characterized in that; The voltage of voltage regulation of said Transient Voltage Suppressor spare (D3) is greater than the POE control chip maximum working voltage in the said POE system, less than the minimum damage voltage of the POE control chip in the said POE system.
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| CN201210334167.2A CN102842903B (en) | 2012-09-11 | 2012-09-11 | A kind of Power over Ethernet system and surge protective device thereof |
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| CN104753048A (en) * | 2013-12-27 | 2015-07-01 | 中兴通讯股份有限公司 | POE power supply protection system and POE power supply protection method |
| CN104934957A (en) * | 2015-07-10 | 2015-09-23 | 上海斐讯数据通信技术有限公司 | POE switch lightning protection circuit |
| CN107104425A (en) * | 2016-02-19 | 2017-08-29 | 横河电机株式会社 | Surge protection device and the field apparatus with surge protection device |
| CN109274083A (en) * | 2018-10-08 | 2019-01-25 | 深圳市三旺通信技术有限公司 | A kind of POE interface surge protection circuit |
| CN109390924A (en) * | 2018-09-11 | 2019-02-26 | 锐捷网络股份有限公司 | Surging protection circuit and POE system |
| CN110581540A (en) * | 2018-06-08 | 2019-12-17 | 华为技术有限公司 | power supply equipment and power over Ethernet system |
| CN112072628A (en) * | 2020-09-22 | 2020-12-11 | 福建星网视易信息系统有限公司 | Data interface protection circuit and data interface |
| CN112714002A (en) * | 2020-12-04 | 2021-04-27 | 杭州士兰微电子股份有限公司 | Power receiving control device, power receiving end equipment and Ethernet power supply system |
| CN115954850A (en) * | 2023-03-14 | 2023-04-11 | 石家庄科林电气股份有限公司 | Miniaturized state quantity input circuit and surge impact protection circuit thereof |
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| WO2015096398A1 (en) * | 2013-12-27 | 2015-07-02 | 中兴通讯股份有限公司 | Poe power supply protection system and method |
| CN104934957A (en) * | 2015-07-10 | 2015-09-23 | 上海斐讯数据通信技术有限公司 | POE switch lightning protection circuit |
| CN107104425A (en) * | 2016-02-19 | 2017-08-29 | 横河电机株式会社 | Surge protection device and the field apparatus with surge protection device |
| CN110581540A (en) * | 2018-06-08 | 2019-12-17 | 华为技术有限公司 | power supply equipment and power over Ethernet system |
| US11183838B2 (en) | 2018-06-08 | 2021-11-23 | Huawei Technologies Co., Ltd. | Power sourcing equipment and power over ethernet system |
| CN109390924A (en) * | 2018-09-11 | 2019-02-26 | 锐捷网络股份有限公司 | Surging protection circuit and POE system |
| CN109274083A (en) * | 2018-10-08 | 2019-01-25 | 深圳市三旺通信技术有限公司 | A kind of POE interface surge protection circuit |
| CN112072628A (en) * | 2020-09-22 | 2020-12-11 | 福建星网视易信息系统有限公司 | Data interface protection circuit and data interface |
| CN112714002A (en) * | 2020-12-04 | 2021-04-27 | 杭州士兰微电子股份有限公司 | Power receiving control device, power receiving end equipment and Ethernet power supply system |
| CN112714002B (en) * | 2020-12-04 | 2023-03-24 | 杭州士兰微电子股份有限公司 | Power receiving control device, power receiving end equipment and Ethernet power supply system |
| CN115954850A (en) * | 2023-03-14 | 2023-04-11 | 石家庄科林电气股份有限公司 | Miniaturized state quantity input circuit and surge impact protection circuit thereof |
| CN115954850B (en) * | 2023-03-14 | 2023-05-09 | 石家庄科林电气股份有限公司 | Miniaturized state quantity input circuit and surge impact protection circuit thereof |
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