CN107272570A - A kind of switching circuit based on CPLD - Google Patents
A kind of switching circuit based on CPLD Download PDFInfo
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- CN107272570A CN107272570A CN201710702179.9A CN201710702179A CN107272570A CN 107272570 A CN107272570 A CN 107272570A CN 201710702179 A CN201710702179 A CN 201710702179A CN 107272570 A CN107272570 A CN 107272570A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1108—Relay module
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of switching circuit based on CPLD, Network Security Device is can apply to, including：With the network interface connection of Network Security Device, the bistable relay for switch data link；It is connected with bistable relay, the control relay circuit for driving bistable relay；It is connected with the voltage input end of Network Security Device, for gathering the electric signal of Network Security Device, and exports the Acquisition Circuit of collection signal；It is connected with Acquisition Circuit, the CPU of Network Security Device and control relay circuit, for the signal sent according to the collection signal or CPU, the CPLD of the working condition of control relay control circuit.When Network Security Device breaks down, CPLD control relays control circuit drives bistable relay switch data link, communication network is set directly physically to turn on, it is to avoid the communication disruption caused by Network Security Device Single Point of Faliure, it is ensured that internetwork proper communication.
Description
Technical field
The present invention relates to Network Security Device field, more particularly to a kind of switching circuit based on CPLD.
Background technology
With developing rapidly for information network, the communication between network is more and more closer, and the opening due to network naturally
Attribute, the safety problem of inter-net communication is more and more, thus, and internetwork communication security is also by pay attention to day by day.
In the prior art, in order to ensure internetwork secure communication, understand application network safety means between networks, make
The network network package that is sent to another network needs to first pass through the Network Security Device and analyzed and processed, and
Only after confirming without threatening, the network package after processing is just forwarded to another network according to predetermined routing rule,
Complete internetwork secure communication, that is to say, that up-link and downlink are directed to Network Security Device, up-link is passed
Defeated uplink traffic will be sent to downlink, just had to pass through Network Security Device and carried out safety verification, if the verification passes,
Uplink traffic can be transmitted to downlink by Network Security Device.Therefore, once Network Security Device Single Point of Faliure, then can not be by
Uplink traffic is transmitted to downlink, so as to cause internetwork communication disruption.
Therefore, how in Network Security Device Single Point of Faliure, still ensure that internetwork proper communication is ability
The current technical issues that need to address of field technique personnel.
The content of the invention
It is an object of the invention to provide a kind of switching circuit based on CPLD, in Network Security Device Single Point of Faliure, according to
It is old to ensure that internetwork proper communication.
In order to solve the above-mentioned technical problem, the switching circuit based on CPLD that the present invention is provided, sets applied to network security
It is standby, including：
With the network interface connection of the Network Security Device, the bistable relay for switch data link；
It is connected with the bistable relay, the control relay circuit for driving the bistable relay；
It is connected with the Network Security Device, for gathering the electric signal of the Network Security Device, and exports collection letter
Number Acquisition Circuit；
It is connected with the Acquisition Circuit, the CPU of the Network Security Device and the control relay circuit, for foundation
The signal that the collection signal or the CPU are sent, controls the CPLD of the working condition of the control relay circuit.
Preferably, the CPLD specifically for：
Periodically obtain the signal that the CPU is sent；
If the signal that the CPU is sent can not be received in current period, the control relay circuit work is controlled
Make, to drive the bistable relay.
Preferably, the Acquisition Circuit is specially：
It is connected with the voltage input end of the Network Security Device, the voltage signal for gathering the voltage input end,
And export the Acquisition Circuit of corresponding collection signal.
Preferably, the Acquisition Circuit specifically includes ADM706 chips, input and the electricity of the ADM706 chips
Input connection is pressed, the output end of the ADM706 chips is connected with the input of the CPLD.
Preferably, the control relay circuit specifically includes L9110 chips, the first input end of the L9110 chips
It is connected respectively with two output ends of the CPLD with the second input, the first output end of the L9110 chips and second defeated
Go out end to be connected with two inputs of the bistable relay respectively.
Preferably, the bistable relay is specially IM43GR relays.
Preferably, the CPLD specifically includes 10M02SCN153C8G-ND chips.
Preferably, the Network Security Device is specially the Network Security Device with 10Bbe RJ45 network interfaces.
The switching circuit based on CPLD that the present invention is provided, can apply to Network Security Device, including：With network security
The network interface connection of equipment, the bistable relay for switch data link；It is connected with bistable relay, for driving bistable
The control relay circuit of state relay；It is connected with the voltage input end of Network Security Device, for gathering Network Security Device
Electric signal, and export collection signal Acquisition Circuit；With Acquisition Circuit, the CPU of Network Security Device and Control electricity
Road is connected, for the signal sent according to the collection signal or CPU, the working condition of control relay control circuit
CPLD.As can be seen here, when Network Security Device failure, exception can occur for the signal that collection signal or CPU are sent, and CPLD will
The abnormal abnormal signal that signal or CPU are sent that gathers is got, so that it is determined that Network Security Device failure, control relay control
Circuit work processed, to drive bistable relay switch data link, makes up-link be pointing directly at downlink, communication network
Directly physically turn on, then uplink traffic is kept away without just can directly be issued to downlink by Network Security Device again
Exempted from the internetwork communication disruption caused by Network Security Device Single Point of Faliure, further ensure that it is internetwork just
Normal open is believed.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, the required accompanying drawing used in embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of circuit block diagram of the switching circuit based on CPLD provided in an embodiment of the present invention；
Fig. 2 is the control relay circuit figure for employing L9110 chips；
Fig. 3 is the Acquisition Circuit figure for employing ADM706 chips.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art on the premise of creative work is not paid, obtained it is all its
His embodiment, belongs to the scope of the present invention.
It is an object of the invention to provide a kind of switching circuit based on CPLD, in Network Security Device Single Point of Faliure, according to
It is old to ensure that internetwork proper communication.
In order that those skilled in the art is better understood from technical solution of the present invention, below in conjunction with the accompanying drawings and specific implementation
The present invention is described in further detail for mode.
Fig. 1 is a kind of circuit block diagram of the switching circuit based on CPLD provided in an embodiment of the present invention.As shown in figure 1, should
For the switching circuit 2 based on CPLD 23 of Network Security Device 1, including：
It is connected with the network interface 10 of Network Security Device 1, the bistable relay 20 for switch data link.
Wherein, data link includes up-link and downlink, and up-link is used to transmit uplink traffic, downlink
For transmitting downlink traffic.Specifically, bistable relay 20 is connected with the data wire of the network interface 10 of Network Security Device 1, both
Can by disconnect the normal open switch of itself and close itself normally closed switch by up-link and downlink be directed to network pacify
Full equipment 1, can also be pointing directly at downlink by disconnecting the normally closed switch of itself and closing normal open switch by up-link.
Such as, when 1 normal work of Network Security Device, bistable relay 20 then disconnects the normal open switch of itself and closes itself
Up-link and downlink are directed to Network Security Device 1 itself by normally closed switch；And when 1 failure of Network Security Device,
Bistable relay 20 then disconnects the normally closed switch of itself and closes normal open switch is pointing directly at downlink by up-link, makes
The uplink downlink of network is directly physically turned on.Even if furthermore, it should be noted that because bistable relay 20 is obstructed
Electricity, the characteristic of the working condition before also can still remaining powered off, so when 1 power down of Network Security Device, switching circuit 2
Working condition will not also change, therefore, and the switching circuit 2 provided in an embodiment of the present invention based on CPLD 23 is more reliable.
Preferably embodiment, in order that the more reliable and more stable work of switching circuit 2, bistable relay 20 can
To select IM43GR relays.
It is connected with bistable relay 20, the control relay circuit 21 for driving bistable relay 20.
Wherein, bistable relay 20 has two input circuits, when inputting a positive pulse voltage, bistable state relay
Device 20 can disconnect normally closed switch and transfer to close normal open switch；When inputting a negative arteries and veins voltage, bistable relay 20 can disconnect often
Switch transfers closure normally closed switch.Control relay circuit 21 is then by exporting different pulse voltages to bistable relay
20 to drive bistable relay 20 to enter different working conditions, so that data link is switched into corresponding state.
Preferably embodiment, in order that the more reliable and more stable work of control relay circuit 21, relay control
Circuit 21 processed can select L9110 chips, by the first input end of L9110 chips and the second input respectively with CPLD's 23
Two output end connections, the first output end and the second output end of L9110 chips is defeated with two of bistable relay 20 respectively
Enter end connection.Wherein, the first output end of L9110 chips is IA pins, and the first output end of L9110 chips is IB pins.
Moreover, usually, a piece of L9110 chips can drive 8 bistable relays 20, every 8 bistable relays
20 can switch the data link for two network interfaces 10 being connected with same bistable relay 20 again, make the two network interfaces 10 mutual
Mutually bypass, so, when the quantity of network interface 10 of Network Security Device 1 increases by a pair, 8 bistables of corresponding increase just can be passed through
State relay 20 and extend a piece of L9110 chips, realize the extension of switching circuit 2.
It is connected with Network Security Device 1, for gathering the electric signal of Network Security Device 1, and exports adopting for collection signal
Collector 22.
Acquisition Circuit 22 is used for the electric signal for gathering Network Security Device 1, can be the voltage for gathering Network Security Device 1
The current signal of signal or Network Security Device 1, and the voltage signal collected or current signal are converted into adopted
Collect signal output to CPLD 23.
As preferred embodiment, for the ease of the collection and analysis of electric signal, and ensure to gather the accuracy of signal,
The input of Acquisition Circuit 22 can be connected with the voltage input end of Network Security Device 1, to gather Network Security Device 1
The electric signal of voltage input end, and export collection signal corresponding with the electric signal.
Preferably embodiment, in order that the relatively reliable work of Acquisition Circuit 22, Acquisition Circuit 22 can be selected
ADM706 chips, the input of ADM706 chips are connected with the voltage input end of Network Security Device 1, the output of ADM706 chips
End is connected with CPLD 23 input.Wherein, the input of ADM706 chips is PFI pins, and the output end of ADM706 chips is
PFO pins, and usually, the voltage of the voltage input end of Network Security Device 1 is 12V, then when the power down of Network Security Device 1
When, ADM706 chips collect voltage signal at PFI pins and can changed therewith, and when ADM706 chips are at PFI pins
When collecting the magnitude of voltage as little as 10.41V of voltage signal representative, ADM706 chips will export a low electricity by PFO pins
Flat caution signal is to CPLD 23.
It is connected with Acquisition Circuit 22, the CPU 11 of Network Security Device 1 and control relay circuit 21, for according to collection
The signal that signal or CPU 11 are sent, the CPLD 23 of the working condition of control relay control circuit 21.
Specifically, CPLD 23 is connected with the output end of Acquisition Circuit 22, it is therefore an objective to obtain collection signal；CPLD 23 with
The connections of CPU 11 include CPLD 23 and CPU 11 GPIO connection, and using the communication link of iic bus interface and CPU 11
Connect.Moreover, CPU 11 can be by setting BYPASS registers and BYPASS functions mask register in CPLD 23 directly to change
Become the opening ways of default switching state and switching circuit 2.
Preferably embodiment, in order to according to the instantaneous operating conditions of Network Security Device 1 control switching circuit 2
Working condition, CPLD 23 can periodically obtain the signal that CPU 11 is sent by GPIO；When can not be connect in current period
When receiving the signal of the transmissions of CPU 11, then control relay control circuit 21 works, to drive bistable relay 20 to switch to
Default switching state.Specifically, CPU 11 sets the BYPASS function mask registers in CPLD 23, makes the cycles of CPLD 23
Property obtain the heartbeat signal that CPU 11 is sent by GPIO, when more than default threshold time (can for one acquisition cycle)
When can't detect heartbeat signal, then it is assumed that CPU 11 has been hung extremely, Network Security Device 1 occurs in that failure, CPLD 23 control after
Electrical apparatus control circuit 21 exports a positive pulse voltage, normally opened to drive the disconnection normally closed switch of bistable relay 20 to transfer closure
Switch, makes bistable relay 20 enter CPU 11 by the default switching state of BYPASS registers, internetwork to ensure
Proper communication.
Certainly, CPU 11 can also set the BYPASS function mask registers in CPLD 23, CPLD 23 is obtained in real time
The collection signal for taking Acquisition Circuit 22 to export, when the collection signal is low level caution signal, then it is assumed that Network Security Device 1
Power down, control relay control circuit 21 exports a positive pulse voltage, normally closed to drive bistable relay 20 to disconnect
Switch transfers to close normal open switch, bistable relay 20 is entered CPU 11 by the default switching state of BYPASS registers,
To ensure internetwork proper communication.
Significantly, since this circuit employs bistable relay 20, so each Network Security Device 1 is again
After upper electricity, bistable relay 20 can all keep switching state of last time when powering off, that is to say, that switching circuit 2 can be kept
Working condition during secondary power-off.Therefore, on each Network Security Device 1 after electricity, CPU 11 can be set according to actual needs
BYPASS registers in CPLD23, to update the working condition of switching circuit 2, and after the setup, then restart one
Secondary switching circuit 2, the switching state of bistable relay 20 is updated to corresponding with the Current Content in BYPASS registers
Switching state, complete switching circuit 2 working condition refreshing；Then CPU 11 is again by setting in CPLD 23
BYPASS registers, to set when 1 failure of Network Security Device, the working condition to be kept of switching circuit 2.Specifically, CPU
11 can be by setting the BYPASS functions mask register in CPLD 23 to change the working method of switching circuit 2 so that when
When Network Security Device 1 is re-powered, CPLD 23 first has to obtain CPU 11 by GPIO transmission control signals, and according to this
The pulse voltage forward or backwards that control signal control relay control circuit 21 is exported, to drive bistable relay 20
Disconnect normally closed switch to transfer to close normal open switch or disconnect normal open switch to transfer to close normally closed switch, to refresh switching circuit 2
Working condition.
It is, of course, understood that BYPASS registers and BYPASS functions mask register inside CPLD 23 can be with
It is configured by the pre-programmed to CPLD 23, the online updatings of CPU 11 can also be passed through.Moreover, in order to which switching circuit 2 can
More reliable work, CPU 11 can make CPLD 23 exist by setting the BYPASS function mask registers inside CPLD 23
When electric on Network Security Device 1, obtain the control signal that CPU 11 is sent by GPIO first, and simultaneously according to collection signal or
The working condition for the real-time control relay control circuit 21 of heartbeat signal that CPU 11 is sent periodically is obtained, was implemented
Journey can be found in described above, will not be repeated here.
Preferably embodiment, in order that switching circuit 2 is more prone to extension, CPLD 23 can be selected
10M02SCN153C8G-ND chips, maximum can support the 10Gbe RJ45 network interfaces of 96 passages.
Preferably, switching circuit 2 can apply to the Network Security Device with 10Bbe RJ45 network interfaces.
It is worth noting that, bypass can be specifically to use two network interfaces 10 to two network interfaces 10 being mentioned above mutually
Cross spider is bypassed, that is to say, that a cross spider is connected between the two network interfaces 10, can be with when enabling this cross spider
Corresponding data wire on two network interfaces 10 is physically turned on, so that up-link is pointing directly at down data links,
Uplink traffic can not directly be issued to downlink by Network Security Device 1, and then ensure that internetwork proper communication.
In addition, the relatively reliable work in order to ensure switching circuit 2, Acquisition Circuit 22 mentioned above and bistable relay 20 are also
Integrated circuit can be selected.
In order that those skilled in the art is better understood from technical scheme provided in an embodiment of the present invention, below with use
Exemplified by the control relay circuit 21 of L9110 chips, combined circuit figure, the present invention is described in further detail.
Fig. 2 is the control relay circuit figure for employing L9110 chips.As shown in Figure 2：
The VCC1 pins and VCC2 pins of L9110 chips are connected with 5V chip power supply voltage ends VDD5V respectively, GND1 pins
It is connected simultaneously with the one end on ground, electric capacity C12 one end and electric capacity C13 respectively with GND2 pins, electric capacity the C12 other end and electric capacity
The C13 other end is connected with 5V chip power supply voltage ends VDD5V respectively, and IA pins and IB pins are respectively connected to the of CPLD 23
One output control signal ctr1 and the second output control signal ctr2, OA pin export the first drive signal I1 respectively with OB pins
With the second drive signal I2 connections.
Above by taking the control relay circuit 21 using L9110 chips as an example, combined circuit figure makees further to the present invention
Detailed description, it can be seen that, the control signal that control relay circuit 21 can be exported according to CPLD 23 is to bistable state relay
Device 20 exports corresponding drive signal.
In order that those skilled in the art is better understood from technical scheme provided in an embodiment of the present invention, below with use
Exemplified by the Acquisition Circuit 22 of ADM706 chips, combined circuit figure, the present invention is described in further detail.
Fig. 3 is the Acquisition Circuit figure for employing ADM706 chips.As shown in Figure 3：
Connected between the MR pins and GND pin of ADM706 chips by electric capacity C236, and reset key SW1 and electric capacity
C236 is in parallel, and MR pins are connected through resistance R154 with 3.3V chip power supply voltage ends VDD3V3,3.3V chip power supply voltage ends
VDD3V3 is connected with one end of VCC pin, electric capacity C114 simultaneously, and the electric capacity C114 other end is connected and ground with GND pin simultaneously
Connection, RESET pins are connected with resistance R116 one end and resistance R117 one end simultaneously, resistance the R116 other end and resistance
R157 one end is connected with 3.3V chip power supply voltage ends VDD3V3 respectively, resistance R117 other end access system reset signal
Reset, PFI pin are connected with resistance R155 one end and one end of resistance 156 simultaneously as the input of ADM706 chips, electricity
The resistance R155 other end is connected with 12V voltage input ends VDD12V, and the other end ground connection of resistance 156, PFO pins are used as ADM706
The output end of chip is connected with the resistance R157 other end and CPLD 23 collection signal input part (not showing in Fig. 3) simultaneously, defeated
Go out to gather signal CO, WDO pin and WDI pins are hanging.
Above by taking the Acquisition Circuit 22 using ADM706 chips as an example, combined circuit figure makees further detailed to the present invention
Describe in detail bright.As can be seen here, Acquisition Circuit 22 can gather the electric signal of Network Security Device 1 and export corresponding collection signal CO
To CPLD 23.Moreover, the Acquisition Circuit 22 of above-mentioned use ADM706 chips has independent reseting module, when will include this
When the switching circuit 2 of Acquisition Circuit 22 is built in Network Security Device 1, the internal resource of Network Security Device 1 can be saved.
In summary, the switching circuit based on CPLD that the present invention is provided, can apply to Network Security Device, including：
With the network interface connection of Network Security Device, the bistable relay for switch data link；It is connected, uses with bistable relay
In the control relay circuit of driving bistable relay；It is connected with the voltage input end of Network Security Device, for gathering net
The electric signal of network safety means, and export the Acquisition Circuit of collection signal；With Acquisition Circuit, the CPU of Network Security Device and after
Electrical apparatus control circuit is connected, and for the signal sent according to collection signal or CPU, control relay controls the working condition of circuit
CPLD.As can be seen here, when Network Security Device failure, exception can occur for the signal that collection signal or CPU are sent, and CPLD is just
The abnormal abnormal signal that signal or CPU are sent that gathers can be got, so that it is determined that Network Security Device failure, control relay
Circuit work is controlled, to drive bistable relay switch data link, up-link is pointing directly at downlink, communication network
Network is directly physically turned on, then uplink traffic just can directly be issued to downlink without passing through Network Security Device again,
The internetwork communication disruption caused by Network Security Device Single Point of Faliure is avoided, further be ensure that internetwork
Proper communication.
The switching circuit provided by the present invention based on CPLD is described in detail above.Each in specification is implemented
Example is described by the way of progressive, and it is difference with other embodiments, each embodiment that each embodiment, which is stressed,
Between identical similar portion mutually referring to.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention,
Some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into the protection domain of the claims in the present invention
It is interior.
It should also be noted that, in this manual, such as first and second etc relational terms are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or behaviour
There is any this actual relation or order between work.Moreover, term " comprising ", "comprising" or its any variant are intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of key element not only include that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
Claims (8)
1. a kind of switching circuit based on CPLD, applied to Network Security Device, it is characterised in that including：
With the network interface connection of the Network Security Device, the bistable relay for switch data link；
It is connected with the bistable relay, the control relay circuit for driving the bistable relay；
It is connected with the Network Security Device, for gathering the electric signal of the Network Security Device, and exports collection signal
Acquisition Circuit；
It is connected with the Acquisition Circuit, the CPU of the Network Security Device and the control relay circuit, for according to described
The signal that signal or the CPU are sent is gathered, the CPLD of the working condition of the control relay circuit is controlled.
2. switching circuit according to claim 1, it is characterised in that the CPLD specifically for：
Periodically obtain the signal that the CPU is sent；
If the signal that the CPU is sent can not be received in current period, the control relay circuit is controlled to work, with
Drive the bistable relay.
3. switching circuit according to claim 2, it is characterised in that the Acquisition Circuit is specially：
It is connected with the voltage input end of the Network Security Device, the voltage signal for gathering the voltage input end, and it is defeated
Go out the Acquisition Circuit of corresponding collection signal.
4. switching circuit according to claim 3, it is characterised in that the Acquisition Circuit specifically includes ADM706 chips,
The input of the ADM706 chips is connected with the voltage input end, and the output end of the ADM706 chips is with the CPLD's
Input is connected.
5. the switching circuit according to claim 1-4 any one, it is characterised in that the control relay circuit is specific
Including L9110 chips, two output ends of the first input end and the second input of the L9110 chips respectively with the CPLD
Connection, two inputs of the first output end and the second output end of the L9110 chips respectively with the bistable relay
Connection.
6. switching circuit according to claim 5, it is characterised in that the bistable relay is specially IM43GR relays
Device.
7. switching circuit according to claim 5, it is characterised in that the CPLD specifically includes 10M02SCN153C8G-
ND chips.
8. switching circuit according to claim 7, it is characterised in that the Network Security Device is specially to have 10Bbe
The Network Security Device of RJ45 network interfaces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710702179.9A CN107272570A (en) | 2017-08-16 | 2017-08-16 | A kind of switching circuit based on CPLD |
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| CN201710702179.9A CN107272570A (en) | 2017-08-16 | 2017-08-16 | A kind of switching circuit based on CPLD |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111858417A (en) * | 2020-07-30 | 2020-10-30 | 山东超越数控电子股份有限公司 | CPLD-based platform network interface management and control method and system |
| CN113746644A (en) * | 2021-09-06 | 2021-12-03 | 铵泰克（北京）科技有限公司 | Safe and effective network Bypass control method |
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| CN102340418A (en) * | 2011-07-14 | 2012-02-01 | 北京星网锐捷网络技术有限公司 | Bypass protection device and method |
| CN203406889U (en) * | 2013-07-16 | 2014-01-22 | 北京工蜂电子技术有限公司 | Internet access BYPASS system capable of setting equipment fault flexibly when power is down |
| CN104333477A (en) * | 2014-11-26 | 2015-02-04 | 上海斐讯数据通信技术有限公司 | Bypass control method and bypass control system as well as network device |
| EP3113232A1 (en) * | 2015-06-30 | 2017-01-04 | Anton Naebauer | Optimised photovoltaic module with bypass network |
| CN205647540U (en) * | 2016-03-07 | 2016-10-12 | 深圳市祈飞科技有限公司 | Net gape BYPASS system of cutting off power supply controllablely |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111858417A (en) * | 2020-07-30 | 2020-10-30 | 山东超越数控电子股份有限公司 | CPLD-based platform network interface management and control method and system |
| CN113746644A (en) * | 2021-09-06 | 2021-12-03 | 铵泰克（北京）科技有限公司 | Safe and effective network Bypass control method |
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Application publication date: 20171020 |