CN1658464A - Protection method of multiplexer network interface and communication equipment with multiplexer network interface - Google Patents
Protection method of multiplexer network interface and communication equipment with multiplexer network interface Download PDFInfo
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- CN1658464A CN1658464A CN 200410005657 CN200410005657A CN1658464A CN 1658464 A CN1658464 A CN 1658464A CN 200410005657 CN200410005657 CN 200410005657 CN 200410005657 A CN200410005657 A CN 200410005657A CN 1658464 A CN1658464 A CN 1658464A
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- 238000004891 communication Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 18
- 230000006698 induction Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 3
- 208000028659 discharge Diseases 0.000 description 36
- 238000013461 design Methods 0.000 description 20
- 230000005611 electricity Effects 0.000 description 9
- 238000009413 insulation Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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Abstract
This invention discloses a multi-path net port defending method and the communication device with multi-path net port. The method is: mutually short connect the central heads of winding (TX+, TX-) external connected signal of every isolating transformer; mutually short connect the central heads of winding (RX+, RX-) external connected signal of every isolating transformer; the central heads and the ground form the electric passageway. When a random pair of signal wire senses the passing voltage, the passing voltage discharges to the ground through the central head. This invention realizes the protection to multi-path net port by using single-path protective circuit, and it greatly save the cost and the structure space demand. And the invention is reliable and easily operated.
Description
Technical field
The present invention relates to communication technical field, the communication equipment that relates in particular to the means of defence of multi-path network port and have multi-path network port.
Background technology
Development along with electronics, mechanics of communication, the demand that the raising of communication apparatus status, importance and user are growing, the integrated level of electronics, communication chip is more and more higher on the one hand, the density of circuit design is increasing, also require simultaneously the adaptability and the reliability of operation of equipment stronger on the other hand, this two aspect is a contradiction each other; The integrated level of electronics, communication product is high more, and current densities is big more, and it is fragile more that the antijamming capability of chip, circuit or equipment just becomes, and stability, reliability are poor more; And simultaneously because the raising of communication apparatus importance and status and user's more strict demand requires the necessary reliable and stable operation of equipment; The contradiction of these two aspects has determined that guard technology is urgent in the importance and the development of electronics, communications industry; Present communication apparatus, Ethernet switch still is that equipment such as router all contain multi-path network port, as 24 road network mouths or the 48 road network oral sexes equipment of changing planes, pressure in view of structure space, cost, so the protection of multi-path network port is designed to a difficult point of present protection design, also be a primary study direction of protection design.
Protection for multi-path network port equipment at present mainly contains following three kinds of schemes:
Scheme one, protect design separately at every road network mouth.Because network interface is a balanced line, and the lightning overvoltage of balanced line induction is mainly based on common mode disturbances, and differential mode interference is very little; So the prime protective circuit commonly used of every road network mouth is illustrated in fig. 1 shown below, wherein the mode among Fig. 11 (shown in the component of left side) is to adopt four two utmost point protection devices, and mode 2 (shown in the component of right side) is to adopt two three utmost point protection devices.
In this scheme, owing to need protect design to each road network mouth, so switch for one 48 port, (every road network mouth all contains two pairs of holding wires just to need to use 96 three utmost point discharge tubes or 192 secondary discharge tubes, promptly send holding wire to TX+～TX-, the received signal line is to RX+～RX-), not only cost height, and needs is the macrostructure space very.Integrated and the low-cost design of the high density original intention of this and product is disagreed.
Scheme two, as shown in Figure 2, this scheme remains at every road network mouth and protects design separately, because network interface is a balanced line, and the lightning overvoltage of balanced line induction is mainly based on common mode disturbances, differential mode interference is very little; So utilize coupling differential mode, the isolation common mode characteristic of isolating transformer, the common mode disturbances and the chip of signal outside line induction isolated, thereby reach the purpose of protecting chip; In this scheme, when TX+, TX-simultaneously respond to an identical interference over the ground, and when not having differential mode disturbance volt between TX+ and the TX-, because transformer has the characteristic of isolating common mode disturbances, so chip has obtained protection.At TX+, when common mode disturbances is sensed in the outside line of TX-signal, has high voltage over the ground on the network interface holding wire of transformer prime, and other parts all be over the ground low-pressure section (for example: power supply, holding wires such as network interface ACT and LINK indication, and other holding wires, power line, ground wire etc. on the PCB veneer), so use this scheme to the PCB layout designing requirement than higher, need strict control insulation distance, guarantee high-voltage signal outside line before the transformer and other all low-voltage signals, power supply, between insulation breakdown does not take place, could realize this conceptual design.
There is following shortcoming in this scheme:
1, this circuit design mainly requires than higher the isolating transformer voltage endurance capability.
2, this circuit design utilizes the characteristic of isolating transformer to realize the protection design, need strict control insulation distance, in case insulation breakdown occurs, can cause the damage of device, chip or the circuit of the connection of breakdown holding wire or power line, (wherein a line punctures also can to cause common mode disturbances to convert differential mode interference damage network interface chip to, and an other line does not puncture, and will produce common mode disturbances slip mould and disturb).Therefore, for the highdensity equipment of Multi-netmouth, this scheme be difficult to realize design purpose, and is can realization property not strong; Simultaneously to CAD engineer's requirement than higher, and risk is bigger.
Scheme three, is as shown in Figure 3 still protected design separately at every road network mouth.Elementary at transformer, TX+ and TX-can contain centre cap, realize centre cap protection design over the ground so, have in fact just realized the protection design over the ground of TX+ and TX-; This design has reduced the possibility that common mode disturbances slip mould disturbs greatly, and the protection device of using than the design of scheme one reduces by half; But this scheme is owing to need protect design to each road network mouth, so switch for one 48 port, still need to use 48 three utmost point discharge tubes or 96 secondary discharge tubes, the cost height, and need very macrostructure space, disagree for the integrated and low-cost design of the high density of product original intention.
Summary of the invention
In view of this, the communication equipment that the invention provides a kind of means of defence of multi-path network port and have multi-path network port, solving prior art in the multi-path network port protection or have the big and cost height of structure space, or existence is to device and the demanding problem of insulation distance.
For addressing the above problem, the invention provides following technical scheme:
A kind of means of defence of multi-path network port, the every road network mouth in the described multi-path network port has isolating transformer, this isolating transformer with external a pair of transmission holding wire (TX+, TX-) and one to received signal line (RX+ RX-) isolates with communication equipment; This method is: with in each isolating transformer as receiving and sending holding wire (TX+, the mutual short circuit of the centre cap of winding TX-) outward; With in each isolating transformer as external received signal line (RX+, the mutual short circuit of the centre cap of winding RX-); Make the centre cap behind the mutual short circuit form electric path with ground, when any a pair of holding wire induction overvoltage, this overvoltage is released to ground by the centre cap of described short circuit.
According to said method: the direct ground connection of the centre cap of short circuit is formed electric path; Perhaps the centre cap with short circuit forms electric path by lightning protection circuit ground connection.
A kind of communication equipment with multi-path network port, the every road network mouth in this communication equipment has isolating transformer, with external a pair of transmission holding wire (TX+, TX-) and one to received signal line (RX+ RX-) isolates with communication equipment; Wherein: conduct receives and sends holding wire (TX+ outward in the isolating transformer of described multi-path network port, the mutual short circuit of the centre cap of winding TX-) becomes the first short circuit circuit, in the isolating transformer of described multi-path network port as external received signal line (RX+, the mutual short circuit of the centre cap of winding RX-) becomes the second short circuit circuit; This first and second short circuits circuit be electrically connected, when any a pair of holding wire induction overvoltage, this overvoltage is released to ground by centre cap, the short circuit circuit of isolating transformer.
According to above-mentioned communication equipment with multi-path network port:
Described electrical connection is meant behind the mutual short circuit of first, second short circuit circuit directly ground connection; Or behind the mutual short circuit of first, second short circuit circuit by protective circuit ground connection; Described first, second short circuit circuit is respectively by protective circuit ground connection.Described protective circuit is two utmost point discharge tubes, piezo-resistance, Transient Voltage Suppressor (TVS pipe), voltage switch type surge suppressor (TSS pipe) or its combination.
Described first, second short circuit circuit is by one three utmost point discharge tube ground connection.
Connect consuming parts or feeding pack between described first, second short circuit circuit, and the first and second short circuit circuits are respectively by protective circuit ground connection; Described protective circuit comprises two piezo-resistances, is connected with ground with first, second short circuit circuit respectively; Described protective circuit also comprises one two utmost point discharge tube or one three utmost point discharge tube, and described two piezo-resistances are by this two utmost points discharge tube or three utmost point discharge tube ground connection; Described protective circuit also comprises two discharge two utmost points, and described two piezo-resistances are respectively by one two utmost point discharge tube ground connection.
The present invention has following beneficial effect:
1, eliminated the common mode overvoltage and converted the differential mode overvoltage to, reliable operation is implemented easily;
2, multi-path network port only adopts one road protection circuit to protect, and has not only saved the protection device cost, and also very little to the structure space requirement, can satisfy communication apparatus low cost, high integrated and high reliability request.
3, do not have very high requirement owing to the centre cap short circuit realization network interface protection with winding, thereby to isolating transformer voltage endurance capability and insulation distance, so risk is less, cost is also lower.
Description of drawings
Fig. 1, Fig. 2, Fig. 3 are multi-path network port protection schematic diagram in the prior art;
Fig. 4 for, Fig. 5, Fig. 6, Fig. 7 for the present invention to not containing remote feeding electricity or the long-range protection schematic diagram that is subjected to the multi-path network port of electricity;
Fig. 8, Fig. 9, Figure 10, Figure 11 are that the present invention is to containing remote feeding electricity or the long-range protection schematic diagram that is subjected to the multi-path network port of electricity.
Embodiment
Present communication apparatus, Ethernet switch still is that equipment such as router all contain multi-path network port, as 24 road network mouths or the 48 road network oral sexes equipment of changing planes, wherein every road network mouth all has isolating transformer, this isolating transformer with external a pair of transmission holding wire (hereinafter to be referred as TX+, TX-) and one to received signal line (, RX-) isolate with communication equipment hereinafter to be referred as RX+.The present invention does not protect separately each road network mouth, but with in each isolating transformer as receiving and sending holding wire (TX+ outward, the mutual short circuit of the centre cap of winding TX-), with in each isolating transformer as external received signal line (RX+, the mutual short circuit of the centre cap of winding RX-); Centre cap behind the mutual short circuit can be conducted with ground, and when any a pair of holding wire induction overvoltage, this overvoltage is released to ground by described centre cap.
Mutually the centre cap of short circuit with conduct (or title is electrically connected) dual mode arranged, promptly directly be connected with ground and be connected with ground by protective circuit.
Consult shown in Figure 4, TX0+, TX0-, RX0+, RX0-are four holding wires of first via network interface, TXm+, TXm-, RXm+, RXm-are four holding wires of m+1 (m is the integer more than or equal to 0) road network mouth, T0, R0 are respectively the centre caps of transformer TX0+～TX0-and RX+～RX-, and promptly the winding of the winding of the winding of TX0+～T0 and TX0-～T0 and RX0+～R0 and RX0-～R0 equates, other network interface corresponding relation unanimities.All mutual short circuits of centre cap T0～Tm become the first short circuit circuit, and all mutual short circuits of centre cap R0～Rm become the second short circuit circuit; The first short circuit circuit and the second short circuit circuit are by protective circuit ground connection.In Fig. 4, protective circuit is two two utmost point discharge tube F1, F2, is connected between the first short circuit circuit (GND) and ground, the second short circuit circuit and the ground.
Do not lose general, when supposing first via network interface outside line induction lightening overvoltage (mainly is common mode, even TX0+, TX0-, the voltage to earth of the induction on RX0+, RX0-four lines is identical), if overvoltage is positive polarity (the negative polarity principle is identical), then the overvoltage on the TX0+ line is released by TX0+ → T0 → F1 → GND, and electric current is from top to bottom in the direction of primary; Overvoltage on the TX0-line is released by TX0-→ T0 → F1 → GND, and electric current is from bottom to top in the direction of primary, and promptly the sense of current of the sense of current of TX0+ line and TX0-is opposite in primary.Because the winding of TX0+～T0 and TX0～-winding of T0 equates that be coupled to secondary electric current this moment and cancel each other, promptly finally being coupled to secondary electric current is zero, illustrate that the common mode overvoltage is in the secondary differential mode overvoltage that do not convert at this moment.In like manner, RX0+ and RX0-can not introduce differential mode interference simultaneously by discharge tube F2 bleed off common mode disturbances yet.In like manner, when responding to common mode disturbances on other road network mouths, also can carry out the bleed off common mode disturbances by F1 and F2, so just realized with of the protection of one road protection circuit multi-path network port,, saved cost and structure space demand greatly, and this scheme reliability height is implemented easily.
Consult shown in Figure 5ly, two two utmost point discharge tube F1, F2 among Fig. 4 are replaced with one three utmost point discharge tube F3, its operation principle is identical.
Consult shown in Figure 6ly,, be about to the whole short circuits interconnection of centre cap R of centre cap and the RX+～RX-of all TX+～TX-, then by one two utmost point discharge tube F ground connection with first short circuit circuit among Fig. 4 and the mutual short circuit of the second short circuit circuit.
Consult Fig. 7, be with the whole ground connection behind the short circuits mutually of the centre cap R of the centre cap T of all TX+～TX-and RX+～RX-, it is equal to two utmost point discharge tube F among Fig. 6 is removed, directly with direct ground connection behind the first short circuit circuit and the mutual short circuit of the second short circuit circuit.
Fig. 4, Fig. 5 and Fig. 6 discharge tube can also be used piezo-resistance, Transient Voltage Suppressor (TransientVoltage Suppressor TVS pipe), voltage switch type surge suppressor (Thyristor Surge Suppressor; TSS pipe) or their combining form.
For among the IEEE 802.3 regulation contain the 48V remote feeding electricity or 48 long-range be subjected to the electricity network interfaces, can not adopt such scheme.As shown in Figure 8: since between the centre cap R of the centre cap T of TX+ and TX-and RX+ and RX-by 48V voltage, so the direct short circuit of T and R can not link together by discharge tube.Because discharge tube belongs to the switching mode protection device, be in open circuit under the normal condition, need a voltage that surpasses its operation voltage to be applied to that device just can move on the discharge tube; Under the situation that applies surge, discharge tube device action conducting, this moment, discharge tube was in short-circuit condition; After the surge pulse finishes, if the voltage about 20V of maintenance is continued at the discharge tube two ends, discharge tube will be kept the short circuit conducting state; If so use discharge tube between the 48V power line, after conducting under the effect of discharge tube at surge because the discharge tube two ends are applied with 48V voltage, so discharge tube will keep the short circuit conducting state always, this moment the power supply fault that will be short-circuited.So must use protective circuit, wait the protection that realizes that protection and 48V to the network interface chip are subjected to electricity/feeding pack as the protection device of piezo-resistance or other clamped types.(48V is by 4 line remote feeding electricities in the netting twine, be require among the IEEE 802.3 can realize content (optional in the network interface design)).
In Fig. 8, all mutual short circuits of centre cap T0～Tm become the first short circuit circuit, and all mutual short circuits of centre cap R0～Rm become the second short circuit circuit, and are connected 48V between the first short circuit circuit and the second short circuit circuit and are subjected to electricity/feeding pack.Protective circuit comprises two piezo-resistance M, and these two piezo-resistances are connected with ground with ground, the second short circuit circuit with the first short circuit circuit respectively.(be any TX+～TX-, or arbitrarily during the induction overvoltage of RX+～RX-), this overvoltage is by (TXm+～TXm-)/(RXm+～RXm-) → Tm/Rm → M → GND releases, and its principle is identical with Fig. 4 when any a pair of holding wire.
Consult shown in Figure 9ly, the protective circuit in this scheme is to have increased by one two utmost point discharge tube F on the basis of Fig. 8, and two piezo-resistances that are connected with first, second short circuit circuit are by this two utmost points discharge tube ground connection.(be any TX+～TX-, or arbitrarily during the induction overvoltage of RX+～RX-), this overvoltage is by (TXm+～TXm-)/(RXm+～RXm-) → Tm/Rm → M → F → GND releases when any a pair of holding wire.
Consult shown in Figure 10ly, protective circuit is to have increased by two two utmost point discharge tube F1, F2 on the basis of Fig. 8, and by one two utmost point discharge tube ground connection, its operation principle is identical with Fig. 9 respectively for two piezo-resistances that are connected with first, second short circuit circuit.
Consult shown in Figure 11ly, the protective circuit in this scheme is to have increased by one three utmost point discharge tube F on the basis of Fig. 8, and two piezo-resistances that are connected with first, second short circuit circuit are by this three utmost points discharge tube ground connection, and its operation principle is identical with Fig. 9.
The above only is preferred embodiment of the present invention; not in order to restriction the present invention; those of ordinary skill in the art can make amendment, be equal to replacement and improvement etc. within the spirit and principles in the present invention, but all should be included within protection scope of the present invention.
Claims (10)
1, a kind of means of defence of multi-path network port, the every road network mouth in the described multi-path network port has isolating transformer, this isolating transformer with external a pair of transmission holding wire (TX+, TX-) and one to received signal line (RX+ RX-) isolates with communication equipment; It is characterized in that this method is:
With in each isolating transformer as receiving and sending holding wire (TX+, the mutual short circuit of the centre cap of winding TX-) outward;
With in each isolating transformer as external received signal line (RX+, the mutual short circuit of the centre cap of winding RX-);
Make the centre cap behind the mutual short circuit form electric path with ground, when any a pair of holding wire induction overvoltage, this overvoltage is released to ground by the centre cap of described short circuit.
2, the method for claim 1 is characterized in that, the direct ground connection of the centre cap of short circuit is formed electric path; Perhaps the centre cap with short circuit forms electric path by lightning protection circuit ground connection.
3, a kind of communication equipment with multi-path network port, the every road network mouth in this communication equipment has isolating transformer, with external a pair of transmission holding wire (TX+, TX-) and one to received signal line (RX+ RX-) isolates with communication equipment; It is characterized in that: conduct receives and sends holding wire (TX+ outward in the isolating transformer of described multi-path network port, the mutual short circuit of the centre cap of winding TX-) becomes the first short circuit circuit, in the isolating transformer of described multi-path network port as external received signal line (RX+, the mutual short circuit of the centre cap of winding RX-) becomes the second short circuit circuit; This first and second short circuits circuit be electrically connected, when any a pair of holding wire induction overvoltage, this overvoltage is released to ground by centre cap, the short circuit circuit of isolating transformer.
4, communication equipment as claimed in claim 3 is characterized in that, described electrical connection is meant behind the mutual short circuit of first, second short circuit circuit directly ground connection; Perhaps pass through protective circuit ground connection behind the mutual short circuit of first, second short circuit circuit; Perhaps first, second short circuit circuit is respectively by protective circuit ground connection.
5, communication equipment as claimed in claim 4 is characterized in that, described protective circuit is two utmost point discharge tubes, piezo-resistance, Transient Voltage Suppressor (TVS pipe), voltage switch type surge suppressor (TSS pipe) or its combination.
6, communication equipment as claimed in claim 3 is characterized in that, described first, second short circuit circuit is by one three utmost point discharge tube ground connection.
7, communication equipment as claimed in claim 3 is characterized in that, connects consuming parts or feeding pack between described first, second short circuit circuit, and the first and second short circuit circuits are respectively by protective circuit ground connection.
8, communication equipment as claimed in claim 7 is characterized in that, described protective circuit comprises two piezo-resistances, is connected with ground with first, second short circuit circuit respectively.
9, communication equipment as claimed in claim 8 is characterized in that, described protective circuit also comprises one two utmost point discharge tube or one three utmost point discharge tube, and described two piezo-resistances are by this two utmost points discharge tube or three utmost point discharge tube ground connection.
10, communication equipment as claimed in claim 8 is characterized in that, described protective circuit also comprises two discharge two utmost points, and described two piezo-resistances are respectively by one two utmost point discharge tube ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100056573A CN100403617C (en) | 2004-02-21 | 2004-02-21 | Protection method of multiplexer network interface and communication equipment with multiplexer network interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100056573A CN100403617C (en) | 2004-02-21 | 2004-02-21 | Protection method of multiplexer network interface and communication equipment with multiplexer network interface |
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| CN1658464A true CN1658464A (en) | 2005-08-24 |
| CN100403617C CN100403617C (en) | 2008-07-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976831A (en) * | 2010-10-26 | 2011-02-16 | 深圳市槟城电子有限公司 | Gigabit LAN (Local Area Network) lightning arrester with PoE (Power on Ethernet) function |
| CN101477883B (en) * | 2008-09-28 | 2012-05-09 | 福建星网锐捷网络有限公司 | Isolated transformer device, printed circuit board and manufacturing process thereof |
| US8179654B2 (en) | 2008-12-10 | 2012-05-15 | Unihan Corporation | Surge preventing circuit, local area network connector, and network module |
| CN101752853B (en) * | 2008-12-10 | 2012-12-19 | 永硕联合国际股份有限公司 | Surge protection circuit, local area network connector and network module |
| CN103138251A (en) * | 2011-11-24 | 2013-06-05 | 瑞昱半导体股份有限公司 | Network communication device with instant energy protective capacity and printed circuit board thereof |
| CN103855550A (en) * | 2012-12-05 | 2014-06-11 | 技嘉科技股份有限公司 | Connector circuit and high-voltage surge protection method thereof |
| CN106159925A (en) * | 2015-04-03 | 2016-11-23 | 富士康(昆山)电脑接插件有限公司 | Network surge prevention circuit and apply the network surge prevention device of this circuit |
| CN112571421A (en) * | 2020-12-23 | 2021-03-30 | 谙布尔(北京)科学技术有限公司 | Robot joint executor, joint executor module and robot |
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| US3911324A (en) * | 1974-09-16 | 1975-10-07 | Boeing Co | Fail-safe power supply |
| JPH0515056A (en) * | 1991-07-04 | 1993-01-22 | Fujitsu Ltd | External abnormal voltage protection system in transmission device |
| DE4141074C1 (en) * | 1991-12-13 | 1993-06-03 | Siemens Nixdorf Informationssysteme Ag, 4790 Paderborn, De | |
| US5995353A (en) * | 1997-06-17 | 1999-11-30 | Hewlett-Packard Company | Apparatus for discharging an electrostatic discharge via a spark gap coupled in series with a high impedance network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101477883B (en) * | 2008-09-28 | 2012-05-09 | 福建星网锐捷网络有限公司 | Isolated transformer device, printed circuit board and manufacturing process thereof |
| US8179654B2 (en) | 2008-12-10 | 2012-05-15 | Unihan Corporation | Surge preventing circuit, local area network connector, and network module |
| CN101752853B (en) * | 2008-12-10 | 2012-12-19 | 永硕联合国际股份有限公司 | Surge protection circuit, local area network connector and network module |
| CN101976831A (en) * | 2010-10-26 | 2011-02-16 | 深圳市槟城电子有限公司 | Gigabit LAN (Local Area Network) lightning arrester with PoE (Power on Ethernet) function |
| CN103138251A (en) * | 2011-11-24 | 2013-06-05 | 瑞昱半导体股份有限公司 | Network communication device with instant energy protective capacity and printed circuit board thereof |
| KR101475147B1 (en) * | 2012-12-05 | 2014-12-19 | 기가 바이트 테크놀러지 컴퍼니 리미티드 | Connection apparatus circuit and high voltage surge protection method thereof |
| CN103855550A (en) * | 2012-12-05 | 2014-06-11 | 技嘉科技股份有限公司 | Connector circuit and high-voltage surge protection method thereof |
| US9065274B2 (en) | 2012-12-05 | 2015-06-23 | Giga-Byte Technology Co., Ltd. | Connection apparatus circuit and high voltage surge protection method thereof |
| CN103855550B (en) * | 2012-12-05 | 2017-05-24 | 技嘉科技股份有限公司 | Connector circuit and high-voltage surge protection method thereof |
| CN106159925A (en) * | 2015-04-03 | 2016-11-23 | 富士康(昆山)电脑接插件有限公司 | Network surge prevention circuit and apply the network surge prevention device of this circuit |
| US9979370B2 (en) | 2015-04-03 | 2018-05-22 | Foxconn Interconnect Technology Limited | Network filtering circuit for protection lightning surge |
| CN112571421A (en) * | 2020-12-23 | 2021-03-30 | 谙布尔(北京)科学技术有限公司 | Robot joint executor, joint executor module and robot |
| CN112571421B (en) * | 2020-12-23 | 2022-06-07 | 谙布尔(北京)科学技术有限公司 | Robot joint executor, joint executor module and robot |
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| Publication number | Publication date |
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| CN100403617C (en) | 2008-07-16 |
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