CN201038746Y - Protector for surge - Google Patents
Protector for surge Download PDFInfo
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- CN201038746Y CN201038746Y CNU2007201544681U CN200720154468U CN201038746Y CN 201038746 Y CN201038746 Y CN 201038746Y CN U2007201544681 U CNU2007201544681 U CN U2007201544681U CN 200720154468 U CN200720154468 U CN 200720154468U CN 201038746 Y CN201038746 Y CN 201038746Y
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Abstract
The utility model discloses a surge protection device for the Ethernet power supply unit, which comprises: a first surge protection circuit that is connected between the power supply source and the control chip and is used for discharging the surge energy between the positive terminal and the grounding terminal of the power supply source; a second surge protection circuit that is connected between the power supply source and the control chip and is used for discharging the surge energy between the positive terminal and the negative terminal of the power supply source; a third surge protection circuit that is connected between the power supply source and the control chip and is used for discharging the surge energy between the negative terminal and the grounding terminal of the power supply source. The utility model can restrict the surge coming from the direction of power supply source and power supply network port.
Description
Technical field
The utility model relates to the communications field, relates more specifically to a kind of surge protective device that is used for Power over Ethernet equipment.
Background technology
Power over Ethernet (Power over Ethernet is called for short PoE) can come to provide data to connect and power supply simultaneously as the user by using one five class Ethernet cable, and does not need to carry out in addition power-supply wiring.This not only needs to power for those but the power supply and the equipment of being inconvenient to obtain are helpful especially, and also very helpful for general terminal equipment.IP phone, WAP (wireless access point), network security camera etc. all are good examples.
Power over Ethernet has the following advantages:
Flexibility: the AC power part that no longer is absolutely necessary, WAP (wireless access point) also needn't be positioned near the AC power.
Remote management capability: IP phone and WAP (wireless access point) can realize remote power feeding or outage; Distance host can determine how many electric weight each terminal equipment needs, and determines to start which equipment.
Higher reliability: feeder ear adopts redundant power in the distance.
Compatibility in the global range: Power over Ethernet can be us provides global range interior multiple power source supply standard.
The Power over Ethernet technology provides about 48 volts DC power supply by the Ethernet cable, offers each electric current that is subjected to electrical nodes and is limited in 350 milliamperes.The power loss that the deduction cable transmission causes, it can offer each total continuous power that is subjected to electrical nodes is 12.95 watts, this is enough for general comparatively small-sized ustomer premises access equipment.
The IEEE802.3af standard definition method of manufacturing Ethernet power supply power supply unit (PowerSourcing Equipment, be called for short PSE) and power receiving equipment (Powered Device, abbreviation PD).Power supply unit is the equipment that power supply is provided to ethernet link, and power receiving equipment is to accept power supply or according to the equipment of certain rule application power supply from ethernet link.
The major function of power supply unit is, whether detect has power receiving equipment by ethernet link request power supply, and the type that detects power receiving equipment, and the power supply that corresponding power is provided is to power receiving equipment.The terminal power supply unit can directly provide power supply by the downlink Ethernet cable for power receiving equipment.
Power supply unit is supported two kinds of Power over Ethernet patterns, difference called after Mode A and Mode B: 1,2,3,6 four data lines in the Mode A employing Ethernet cable (wherein, 1,2 lines are for sending data wire, 3,6 lines are for receiving data wire) transmit power supply, Mode B then adopts 4,5,7,8 four idle lines in the Ethernet cable to transmit power supply.
The down link of terminal power supply unit can adopt Mode A or Mode B, also can adopt two kinds of patterns respectively at different links.And this kind equipment can compatible 10,000,000,100,000,000 and even the Ethernet of gigabit.But in actual use, the terminal power supply unit should not uploaded the transmission of electricity source with A and two kinds of patterns of B to same ethernet link simultaneously, and an ethernet link can only be worked in one mode at synchronization.And in stride for the power supply unit (Fig. 1 has provided the schematic diagram of middle straddle type Power over Ethernet equipment), generally only adopt 4,5,7,8 four idle lines in the Ethernet cable to transmit power supply, promptly can only be operated in Mode B, and present standard is not also supported gigabit Ethernet.
Surge is meant the transient overvoltage that exceeds normal working voltage.Thunder and lightning is a kind of of surge voltage, and lightning protection in fact is a kind of function of Surge Protector, because the surge voltage that the surge voltage of thunderbolt and energy will be higher than other kinds far away, so we claim lightning surge usually.
Thunderbolt mainly contains two kinds of forms: direct stroke and indirect lightning strike.Direct stroke is meant that thunder and lightning directly hits on object, thereby has produced electrical effect, thermal effect and mechanical force.When indirect lightning strike was meant thunder discharge, nearby electrostatic effect that produces on the conductor and electromagnetic induction may make and produce spark between the metal parts.The invasion approach of thunderbolt has following two kinds:
1. the side effect of conventional lightning conductor produces secondary indirect lightning strike effect, senses on the indoor transmission line when lightning current process is taken shelter from the thunder needle guide ground.Integrated higher microelectronic device, shock-resistant ability, thereby be more vulnerable to damage when thunderbolt takes place.
2. introduce indirect lightning strike by power line or feeder, be coupled to all kinds of transmission lines and destruction equipment by inductive couplings (magnetic induction).
Power line is introduced indirect lightning strike: outdoor supply line adopts aerial line mostly, and the probability that thunder and lightning and civil power are coupled is very high.
The holding wire indirect lightning strike: during induction thunder invasion holding wire, the PORT COM of easy damage equipment.The communication lightning prevention circuit is mainly adopted in the lightning protection of communication network.At present, the normal mode that adopts of computer remote networking have telephone wire, special line, X.25, DDN and frame relay etc., communication network equipment is mainly modulator-demodulator, Ethernet switch, router etc.Usually select lightning prevention circuit according to type, bandwidth, the line electricity equality of communication line, the communication lightning prevention circuit is connected on the communication line.
Along with the fast development of electronic technology, integrated circuit is more and more higher to the sensitivity of voltage and current pulse, and except that the direct stroke influence, impulse overvoltage that thunder and lightning causes and electric current become one of principal element that causes electronic equipment damage and work interruption.Therefore, to the protection of protection, especially indirect lightning strike of thunderbolt, become the problem that industry such as post and telecommunications is paid close attention to and taken precautions against.
The utility model content
One or more problems in view of the above, the utility model provide a kind of surge protective device that is used for Power over Ethernet equipment.
Comprise according to the surge protective device that is used for Power over Ethernet equipment of the present utility model: first surge protection circuit, be connected between power supply and the control chip, be used to the release anode of power supply and the surge energy between the earth terminal; Second surge protection circuit is connected between power supply and the control chip, is used to the release anode of power supply and the surge energy between the negative terminal; And the 3rd surge protection circuit, be connected between power supply and the control chip, be used to the release negative terminal of power supply and the surge energy between the earth terminal.
Between first, second and the 3rd surge protection circuit and control chip, also be connected with surge residual voltage decoupling circuit, be used for postponing and hinder the surge residual amount of energy arriving control chip.
Can also comprise according to surge protective device of the present utility model: the 4th surge protection circuit, be connected between control chip and the power supply network interface, be used to the release positive output end of power supply network interface and the surge energy between the negative output terminal.
Wherein, the 4th surge protection circuit comprises: elementary protective circuit, be connected between control chip and the power supply network interface, and be used to the release positive output end of power supply network interface and the surge energy between the negative output terminal; Secondary protective circuit is connected between elementary protective circuit and the control chip, is used for further the release positive output end of power supply network interface and the surge energy between the negative output terminal.
Can also comprise according to surge protective device of the present utility model: the 5th surge protection circuit; be connected between control chip and the power supply network interface, be used to the release positive output end and the earth terminal of power supply network interface and the power negative output terminal of network interface and the surge energy between the earth terminal.
Wherein, first, second and the 3rd surge protection circuit are made up of piezo-resistance or Transient Suppression Diode or gas discharge tube.Surge residual voltage decoupling circuit is made up of common mode inductance.Elementary protective circuit, secondary protective circuit and the 5th surge protection circuit are made up of inductance and Transient Suppression Diode or inductance and pressure sensitive inductive or inductance and gas discharge tube respectively.
Wherein, the response voltage of piezo-resistance is higher than 57 volts, is lower than 10 to 20 volts of the tenability limits of control chip.The puncture voltage of Transient Suppression Diode is higher than 57 volts, be lower than 10 to 20 volts of the tenability limits of control chip.
By the utility model, can realize inhibition to the surge that comes self powered supply and power supply network interface direction.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 is an existing Ethernet power supply schematic diagram;
Fig. 2 is between the power supply and control chip of Power over Ethernet equipment, the device schematic diagram when all not adding surge protection circuit between power supply network interface and the control chip;
Fig. 3 is the block diagram according to the surge protective device that is used for Power over Ethernet equipment of the utility model embodiment;
Fig. 4 is the device schematic diagram when having added surge protection circuit between the power supply of the utility model embodiment and the control chip;
Fig. 5 is between the power supply and control chip according to the utility model embodiment, the device schematic diagram when having added surge protection circuit between control chip and the power supply network interface;
Fig. 6 is the device schematic diagram when having added surge protection circuit in addition between control chip shown in Fig. 5 and power supply network interface;
Fig. 7 and Fig. 8 are before adding surge protection circuit again between control chip shown in Fig. 6 and the power supply network interface and device schematic diagram afterwards; And
Fig. 9 is between the power supply and control chip according to the another embodiment of the utility model, the device schematic diagram when having added surge protection circuit between control chip and the power supply network interface.
Embodiment
POE power supply network interface is made up of data wire and supply lines, and data wire will pass through transformer module before being connected to network interface, and lightning surge reduces greatly through energy behind the transformer module, so surge wants littler to the influence of holding wire.But POE network interface supply lines is directly drawn from POE control chip pin, under the situation that does not add any safeguard procedures, surge directly is added on the pin of POE control chip, can cause the damage of POE control chip so that damage, and then cause the whole system cisco unity malfunction.
The utility model can carry out the characteristic that energy is released or absorbed by utilizing some electronic component; overcome in the existing POE technology limitation to reliability consideration; increase is to the surge protection of POE supply lines, thus to the POE control chip so that whole system protect.
With reference to figure 2, illustrate between the DC power supply and POE control chip of POE equipment, the situation when all not adding protection between power supply network interface and the POE control chip.As shown in Figure 2, under situation about not adding, can directly be added on the pin of POE control chip from power supply or the power supply network surge that comes of making a slip of the tongue according to surge protective device of the present utility model.The POE control chip belongs to integrated circuit, and the voltage max that can stand is usually less than 100V, and the peak value of surge will be higher than this value far away, in this case, very easily causes the damage of POE control chip so that permanent damage.K.20:2003, with surge test standard GB/T 17626.5:1999 IEC61000-4-5:2001 YD/T 950:1998 ITU-T is example.Adopt line-line ± 0.5kV 1.2/50us 1 0/700us, line-ground ± 1.0kV 1.2/50us 10/700us is higher than the tenability limit of chip far away.
Below with reference to accompanying drawing, describe embodiment of the present utility model in detail.
With reference to figure 3, the surge protective device that is used for Power over Ethernet equipment according to the utility model embodiment is described.As shown in Figure 3, this surge protective device comprises: first surge protection circuit 302, be connected between power supply and the control chip, and be used to the release anode of power supply and the surge energy between the earth terminal; Second surge protection circuit 304 is connected between power supply and the control chip, is used to the release anode of power supply and the surge energy between the negative terminal; And the 3rd surge protection circuit 306, be connected between power supply and the control chip, be used to the release negative terminal of power supply and the surge energy between the earth terminal.
Between first, second and the 3rd surge protection circuit and control chip, also be connected with surge residual voltage decoupling circuit 308, be used for postponing and hinder the surge residual amount of energy arriving control chip.
Can also comprise according to surge protective device of the present utility model: the 4th surge protection circuit 310, be connected between control chip and the power supply network interface, be used to the release positive output end of power supply network interface and the surge energy between the negative output terminal.
Wherein, the 4th surge protection circuit comprises: elementary protective circuit, be connected between control chip and the power supply network interface, and be used to the release positive output end of power supply network interface and the surge energy between the negative output terminal; Secondary protective circuit is connected between elementary protective circuit and the control chip, is used for further the release positive output end of power supply network interface and the surge energy between the negative output terminal.
Can also comprise according to surge protective device of the present utility model: the 5th surge protection circuit 312; be connected between control chip and the power supply network interface, be used to the release positive output end and the earth terminal of power supply network interface and the power negative output terminal of network interface and the surge energy between the earth terminal.
Wherein, first, second and the 3rd surge protection circuit are made up of piezo-resistance or Transient Suppression Diode or gas discharge tube.Surge residual voltage decoupling circuit is made up of common mode inductance.Elementary protective circuit, secondary protective circuit and the 5th surge protection circuit are made up of inductance and Transient Suppression Diode or inductance and pressure sensitive inductive or inductance and gas discharge tube respectively.
Wherein, the response voltage of piezo-resistance is higher than 57 volts, is lower than 10 to 20 volts of the tenability limits of control chip.The puncture voltage of Transient Suppression Diode is higher than 57 volts, be lower than 10 to 20 volts of the tenability limits of control chip.
With reference to figure 4, the situation of having added surge protection circuit according between the power supply of the utility model embodiment and the control chip is described.As shown in Figure 4, from the voltage of power supply output-44V～-57V between, though surge has been added in the input of power supply, rather than directly be added in the output of power supply, but, still may surpass the tenability limit of POE control chip in the surge residual voltage of the output of power supply in surge moment.
Surge protection circuit to this direction is made up of piezo-resistance 2, piezo-resistance 19, Transient Suppression Diode 20 and 18 4 devices of common mode inductance.
In Fig. 4, S1 is that the power supply outbound course is added in the surge between-48 ground (GND) and the protection ground, the just anode of power supply and the surge between the earth terminal; S2 be the power supply outbound course be added in-48 ground and-surge between the 48V, the just anode of power supply and the surge between the negative terminal; S3 is that the power supply outbound course is added in-48V and the surge of protection between the ground, the just negative terminal of power supply and the surge between the earth terminal.
Differential mode (between line) surge is applied to the S2 position, promptly GND and-48V between.The surge residual voltage just has been applied on the Transient Suppression Diode 20 like this, and no matter applying forward on Transient Suppression Diode still is the reverse surge residual voltage, and the voltage between line all can be suppressed near the breakdown potential nip of Transient Suppression Diode.
Wherein, the puncture voltage of Transient Suppression Diode can not be lower than 57V, otherwise POE normal power supply upper limit 57V also can be breakdown, but puncture voltage can not be too high, be lower than POE control chip tenability limit value 10～20V, deboost with the POE control chip is that 90V is an example, and puncture voltage is advisable about with 70V.
When common mode surge (GND or-48V to protection ground GNDP) when being added in S1 or S2 position; piezo-resistance 2 or 19 conductings; line-ground voltage is suppressed at the response voltage district of piezo-resistance, has reduced the surge residual voltage, common mode inductance 18 has played the effect that postpones and hinder the surge residual amount of energy simultaneously.
Wherein, the response voltage of piezo-resistance can not be lower than 57V, otherwise POE normal power supply upper limit 57V also can be breakdown, but response voltage can not be too high, be lower than POE control chip tenability limit value 10～20V, deboost with the POE control chip is that 90V is an example, and the piezo-resistance response voltage is advisable about with 70V.
With reference to figure 5 to Fig. 8, the situation that illustrates between the power supply and control chip according to the utility model embodiment, all added surge protection circuit between control chip and the power supply network interface.
In Fig. 5 to Fig. 8, S4 is that power supply network interface direction is added in the surge between POE supply lines positive voltage terminal and the protection ground, the positive output end of the network interface of just powering and the surge between the earth terminal; S5 is that power supply network interface direction is added in the surge between POE supply lines positive voltage terminal and the negative voltage side, the positive output end of the network interface of just powering and the surge between the negative output terminal; S6 is that power supply network interface direction is added in the surge between POE supply lines negative voltage side and the protection ground, just the negative output terminal buckled of power supply network and the surge between the earth terminal.
Wherein, the difference mode surge protection of power supply network interface direction is realized by the second class protection circuit.Wherein, this second class protection circuit comprises: the primary and secondary protective circuit.
As shown in Figure 5, elementary protective circuit is made up of inductance 9,11 and 12 3 devices of Transient Suppression Diode, is used for the elementary protection to differential mode (between line) surge.Differential mode (between line) surge is applied to the S5 position, promptly GNDOUT and-48VOUT between.Surge is by inductance 9 and 11 after-applied on the Transient Suppression Diode 12.When on Transient Suppression Diode 12, applying the forward surge, Transient Suppression Diode 12 conductings, surge energy is released.When the reverse surge voltage that applies on Transient Suppression Diode 12 surpasses the puncture voltage of Transient Suppression Diode 12, Transient Suppression Diode 12 is breakdown, surge energy is released or is absorbed, and makes that the voltage between line remains near the breakdown potential nip of Transient Suppression Diode.
Wherein, the puncture voltage of Transient Suppression Diode 12 can not be lower than 57V, otherwise also can be breakdown when POE works in upper voltage limit 57V, but puncture voltage can not be too high, be lower than POE control chip deboost value 10～20V, deboost with the POE control chip is that 90V is an example, and puncture voltage is advisable with 70V.
Transient Suppression Diode needs the reaction time, and when surge arrived, the reaction time was the smaller the better.But need the reaction time after all,, when the surge residual voltage is added in Transient Suppression Diode 12, also be added in simultaneously on the POE control chip, so cause the damage of POE control chip easily so that damage if adopt the one-level protection.
For better the POE control chip being protected, it is very necessary that secondary protective circuit seems.As shown in Figure 6, secondary protective circuit is made up of inductance 8,13 and 14 3 devices of Transient Suppression Diode, is used for realizing that the secondary to differential mode (between line) surge protects.Secondary protective circuit principle is with elementary protective circuit; but be different from and elementary be; because the inhibition of inductance 8,13; surge reaches Transient Suppression Diode 14 to postpone than Transient Suppression Diode 12; be that Transient Suppression Diode 12 is prior to 14 work; promptly be applied to surge energy on 14 and all or greatly released by Transient Suppression Diode 12 or absorb, dropping on the Transient Suppression Diode 14 is the residual voltage of surge S5, and Transient Suppression Diode 14 is released to residual amount of energy again.Thereby, protected the POE control chip effectively.
To the protection of the common mode surge of power supply network interface direction, then form by Transient Suppression Diode 16.Realization is to the protection of common mode (line is to protection ground GNDP) surge.
As shown in Figure 7, under the situation that does not add Transient Suppression Diode 16, common mode (line ground) surge is equivalent to directly be added between the source S and drain D of NMOS pipe 15, causes the damage of NMOS pipe 15 easily so that damage.
As shown in Figure 8, under the situation that adds Transient Suppression Diode 16, the common mode surge energy is released rapidly by Transient Suppression Diode 16 or is absorbed, and NMOS pipe 15 is protected.
Wherein, Transient Suppression Diode 16 puncture voltages can not be lower than 57V, otherwise also can be breakdown when POE works in upper voltage limit 57V, but puncture voltage can not be too high, be lower than POE control chip deboost value 10～20V, deboost with the POE control chip is that 90V is an example, and puncture voltage is advisable with 70V.
As shown in Figure 9, NMOS pipe 15 may be placed on POE control chip outside, also can be integrated in the inside of POE control chip.
Wherein, Transient Suppression Diode can be replaced by similar devices such as gas discharge tube and piezo-resistances.
Piezo-resistance can be suppressed similar devices such as diode and piezo-resistance by gas discharge tube, transient voltage and replace.
Energy is released or the electronic devices and components of absorption function as long as have, and major part can be applied to herein.But, in the utility model, no matter adopting which kind of electronic component, the puncture voltage of this element all can not be too little, otherwise also can be breakdown during operate as normal; Can not be too big, otherwise surge energy can't puncture when arriving.And the response speed of element is fast as far as possible, so that energy is released rapidly.
For example:, therefore want relatively short protective device of choice reaction time because surge energy need discharge as early as possible.As reaction time of gas discharge tube, piezo-resistance, Transient Suppression Diode all more than the us level, can satisfy the requirement of rapid release energy in the surge protection, and can absorb transient state macro-energy surge.
The above is embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present utility model.
Claims (10)
1. a surge protective device is used for Power over Ethernet equipment, it is characterized in that, comprising:
First surge protection circuit is connected between power supply and the control chip, is used to the release anode of described power supply and the surge energy between the earth terminal;
Second surge protection circuit is connected between described power supply and the described control chip, is used to the release anode of described power supply and the surge energy between the negative terminal; And
The 3rd surge protection circuit is connected between described power supply and the described control chip, is used to the release negative terminal of described power supply and the surge energy between the described earth terminal.
2. surge protective device according to claim 1; it is characterized in that; between described first, second and the 3rd surge protection circuit and described control chip, also be connected with surge residual voltage decoupling circuit, be used for postponing and hinder the surge residual amount of energy arriving described control chip.
3. surge protective device according to claim 2 is characterized in that, also comprises:
The 4th surge protection circuit is connected between described control chip and the power supply network interface, is used to the release positive output end of described power supply network interface and the surge energy between the negative output terminal.
4. surge protective device according to claim 3 is characterized in that, described the 4th surge protection circuit comprises:
Elementary protective circuit is connected between described control chip and the described power supply network interface, is used to the release positive output end of described power supply network interface and the surge energy between the negative output terminal;
Secondary protective circuit is connected between described elementary protective circuit and the described control chip, is used for further the release positive output end of described power supply network interface and the surge energy between the negative output terminal.
5. surge protective device according to claim 4 is characterized in that, also comprises:
The 5th surge protection circuit is connected between described control chip and the described power supply network interface, positive output end and the negative output terminal of described earth terminal and described power supply network interface and the surge energy between the described earth terminal of the described power supply network interface that is used to release.
6. surge protective device according to claim 5 is characterized in that, described first, second and the 3rd surge protection circuit are made up of piezo-resistance or Transient Suppression Diode or gas discharge tube.
7. surge protective device according to claim 6 is characterized in that, described surge residual voltage decoupling circuit is made up of common mode inductance.
8. surge protective device according to claim 7; it is characterized in that described elementary protective circuit, described secondary protective circuit and described the 5th surge protection circuit are made up of inductance and Transient Suppression Diode or inductance and pressure sensitive inductive or inductance and gas discharge tube respectively.
9. according to each described surge protective device in the claim 1 to 8, it is characterized in that the response voltage of described piezo-resistance is higher than 57 volts, be lower than 10 to 20 volts of the tenability limits of described control chip.
10. according to each described surge protective device in the claim 1 to 8, it is characterized in that the puncture voltage of described Transient Suppression Diode is higher than 57 volts, be lower than 10 to 20 volts of the tenability limits of described control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201544681U CN201038746Y (en) | 2007-05-22 | 2007-05-22 | Protector for surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201544681U CN201038746Y (en) | 2007-05-22 | 2007-05-22 | Protector for surge |
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| Publication Number | Publication Date |
|---|---|
| CN201038746Y true CN201038746Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007201544681U Expired - Lifetime CN201038746Y (en) | 2007-05-22 | 2007-05-22 | Protector for surge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110980A (en) * | 2011-02-23 | 2011-06-29 | 聚信科技有限公司 | Lightning protection circuit |
| CN102723706A (en) * | 2012-05-30 | 2012-10-10 | 武汉烽火网络有限责任公司 | PoE port overvoltage comprehensive protection circuit and method for realizing same |
| CN102842903A (en) * | 2012-09-11 | 2012-12-26 | 迈普通信技术股份有限公司 | Power over Ethernet system and surge protection device thereof |
| CN103259256A (en) * | 2013-03-14 | 2013-08-21 | 北京捷安通达科贸有限公司 | Power signal co-cable transmission type lightning protective device and method |
| 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 |
| CN106532625A (en) * | 2016-11-30 | 2017-03-22 | 深圳市泛海三江科技发展有限公司 | Protection circuit module for network cable power supply channel, power supply channel, power supply equipment and power supply system |
| CN109446139A (en) * | 2018-10-22 | 2019-03-08 | 深圳市共进电子股份有限公司 | A kind of serial ports of band protection |
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2007
- 2007-05-22 CN CNU2007201544681U patent/CN201038746Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110980B (en) * | 2011-02-23 | 2014-06-04 | 华为机器有限公司 | Lightning protection circuit |
| WO2012113216A1 (en) * | 2011-02-23 | 2012-08-30 | 聚信科技有限公司 | Lightning protection circuit |
| CN102110980A (en) * | 2011-02-23 | 2011-06-29 | 聚信科技有限公司 | Lightning protection circuit |
| CN102723706A (en) * | 2012-05-30 | 2012-10-10 | 武汉烽火网络有限责任公司 | PoE port overvoltage comprehensive protection circuit and method for realizing same |
| CN102723706B (en) * | 2012-05-30 | 2015-08-19 | 武汉烽火网络有限责任公司 | PoE port overvoltage integrated protection circuit and its implementation |
| CN102842903A (en) * | 2012-09-11 | 2012-12-26 | 迈普通信技术股份有限公司 | Power over Ethernet system and surge protection device thereof |
| CN102842903B (en) * | 2012-09-11 | 2015-08-12 | 迈普通信技术股份有限公司 | A kind of Power over Ethernet system and surge protective device thereof |
| CN103259256A (en) * | 2013-03-14 | 2013-08-21 | 北京捷安通达科贸有限公司 | Power signal co-cable transmission type lightning protective device and method |
| 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 |
| 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 |
| CN106532625A (en) * | 2016-11-30 | 2017-03-22 | 深圳市泛海三江科技发展有限公司 | Protection circuit module for network cable power supply channel, power supply channel, power supply equipment and power supply system |
| CN106532625B (en) * | 2016-11-30 | 2018-11-30 | 深圳市泛海三江科技发展有限公司 | Protection circuit module, supplying channels, equipment and the system in Power-over-Ethernet channel |
| CN109446139A (en) * | 2018-10-22 | 2019-03-08 | 深圳市共进电子股份有限公司 | A kind of serial ports of band protection |
| CN109446139B (en) * | 2018-10-22 | 2022-05-20 | 深圳市共进电子股份有限公司 | Serial port with protection function |
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