CN102437549B - Two lines bus short-circuit protection isolating device and the method for two lines bus short-circuit protection isolation - Google Patents
Two lines bus short-circuit protection isolating device and the method for two lines bus short-circuit protection isolation Download PDFInfo
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- CN102437549B CN102437549B CN201110439882.8A CN201110439882A CN102437549B CN 102437549 B CN102437549 B CN 102437549B CN 201110439882 A CN201110439882 A CN 201110439882A CN 102437549 B CN102437549 B CN 102437549B
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Abstract
A kind of method for providing two lines bus short-circuit protection isolating device and the isolation of two lines bus short-circuit protection, described device includes：Control unit；Short-circuit signal is gathered and protection location; including the collection of multiple short-circuit signals and protection module; each short-circuit signal is gathered and protection module is connected by branch road two lines bus with a detector; each short-circuit signal is gathered and protection module determines whether its detector for being connected is short-circuited; if it is determined that detector is short-circuited, then alarm signal is sent to control unit by short-circuit signal collection and protection module；Two lines bus Transmit-Receive Unit; two lines bus are connected to control unit; so that control unit communicates with detector; if control unit receives alarm signal; then control unit exports to corresponding in the collection of the multiple short-circuit signal and protection module control signal; the corresponding short-circuit signal collection and protection module disconnect the detector being short-circuited and two lines bus total loop according to control signal disconnected branches two lines bus.
Description
Technical field
The present invention relates to a kind of method of two lines bus short-circuit protection isolating device two lines bus short-circuit protection isolation, the two lines bus
Short-circuit protection isolating device causes that protective current can be adjusted according to the size of protection zone equipment operating current, can be applied to
Temperature detector, the short-circuit protection of smoke alarm in high-power grid type fan intelligent fire-fighting system.
Background technology
In recent years, MW class wind turbine group is developed rapidly.The fire-fighting equipment of wind power generating set is basic on current road
On be all hand fire extinguisher.For this reason, once wind power generating set occurs fire in the case of nobody, may
The accident all burnt is faced, great economic loss is caused.Therefore a set of stabilization, reliable fan intelligent fire-fighting system pair
It is even more important for wind power generating set equipment.
Generally communicated between fan intelligent fire-fighting system controller and detector using two line communication mode, visited
The different zones that device is distributed in wind power generating set are surveyed, when short circuit occurs in some region of detector, whole piece two can be caused total
Line loop communication paralysis.
Accordingly, it would be desirable to go out to meet the requirements with relatively low Cost Design, the protection that strong interference immunity, short-circuit protection function are complete
Isolating device.
The content of the invention
According to an aspect of the present invention, there is provided a kind of two lines bus short-circuit protection isolating device, the device includes：Control is single
Unit；Short-circuit signal is gathered and protection location, including the collection of multiple short-circuit signals and protection module, and each short-circuit signal is gathered and protected
Shield module is connected by branch road two lines bus with a detector, and the collection of each short-circuit signal and protection module determine what it was connected
Whether detector is short-circuited, if it is determined that detector is short-circuited, then short-circuit signal collection and protection module are by alarm signal
It is sent to control unit；Two lines bus are connected to control unit by two lines bus Transmit-Receive Unit so that control unit is led to detector
Letter, wherein, if control unit receives alarm signal, control signal output is arrived the multiple short-circuit signal by control unit
Corresponding one in collection and protection module, the corresponding short-circuit signal collection and protection module disconnect according to control signal
Branch road two lines bus, the detector being short-circuited and two lines bus total loop are disconnected.
Two lines bus short-circuit protection isolating device may also include：Two lines bus voltage acquisition unit, gathers the bus electricity of two lines bus
Pressure, the bus voltage of two lines bus is converted to the value in preset range, and the voltage of conversion is sent into control unit.
If the control unit determine that the voltage of conversion is higher than predetermined threshold, then control unit can disconnected branches two lines bus and spy
Survey the connection of device.
Two lines bus short-circuit protection isolating device may also include：Light emitting diode indicating member, is connected to control unit, works as spy
When survey device is short-circuited, the corresponding lumination of light emitting diode in light emitting diode indicating member is included in, to send alarm.
Each short-circuit signal is gathered and protection module may include：Relay, tie point bus in branch road two lines bus and
One in second branch road bus is connected to the relay；Positive temperature coefficient device, one end connection of positive temperature coefficient device
To relay, the other end of positive temperature coefficient device is connected to detector；Electric bridge, one end of electric bridge is connected to positive temperature coefficient device
Part；Optocoupler, is connected to the other end of electric bridge.
When detector is short-circuited, the electric current increase of positive temperature coefficient device is flowed through, cause positive temperature coefficient device
Internal driving increases, and causes positive temperature coefficient device two ends voltage difference occur, and the voltage difference makes optocoupler by electric bridge
Control signal output is arrived relay by alarm signal output to control unit, control unit by LEDs ON, optocoupler
Device, disconnects in the tie point bus and the second branch road bus of relay, by the detector being short-circuited
Disconnected with two lines bus total loop.
Two lines bus voltage acquisition unit may include the first voltage grading resistor being one another in series and the second voltage grading resistor, first
One end ground connection of voltage grading resistor, the other end of the first voltage grading resistor is connected to one end of the second voltage grading resistor, second point
The other end of piezoresistance device is connected to the positive pole of the electric bridge being included in two lines bus Transmit-Receive Unit, the output of the positive pole of the electric bridge
Voltage is supplied to bus voltage collecting unit, the section between the first voltage grading resistor and the second voltage grading resistor as bus voltage
The voltage of point is sent to control unit.
The resistance value of the second voltage grading resistor can be 5 times of the resistance value of the first voltage grading resistor.
Light emitting diode indicating member may include multiple light emitting diodes of parallel connection, when detector is short-circuited, control
Unit applies control signals to corresponding in the multiple diode so that the corresponding light emitting diode hair
Light, to send alarm.
According to another aspect of the present invention, there is provided a kind of to realize two lines bus short circuit using two lines bus short-circuit protection isolating device
The method of protective separation, the two lines bus short-circuit protection isolating device includes control unit, short-circuit signal collection and protection location
With two lines bus Transmit-Receive Unit, short-circuit signal collection and protection location include multiple short-circuit signal collections and protection module, two lines bus
Two lines bus are connected to control unit by Transmit-Receive Unit, and methods described includes：Each short-circuit signal is gathered and protection module determines it
Whether the detector for being connected is short-circuited；If it is determined that detector is short-circuited, then short-circuit signal collection and protection module will
Alarm signal is sent to control unit；If control unit receives alarm signal, control unit arrives control signal output
Corresponding one in the multiple short-circuit signal collection and protection module；The corresponding short-circuit signal collection and protection module
According to control signal disconnected branches two lines bus, the detector being short-circuited and two lines bus total loop are disconnected.
Each short-circuit signal is gathered and protection module may include：Relay, tie point bus in branch road two lines bus and
One in second branch road bus is connected to the relay；Positive temperature coefficient device, one end connection of positive temperature coefficient device
To relay, the other end of positive temperature coefficient device is connected to detector；Electric bridge, one end of electric bridge is connected to positive temperature coefficient device
Part；Optocoupler, is connected to the other end of electric bridge, wherein, when detector is short-circuited, flow through the electricity of positive temperature coefficient device
Stream increase, causes the internal driving of positive temperature coefficient device to increase, and causes positive temperature coefficient device two ends voltage difference occur, described
Voltage difference makes the LEDs ON of optocoupler, optocoupler to control unit, control alarm signal output by electric bridge
Unit processed by control signal output to relay, in disconnecting the tie point bus and the second branch road bus of relay
One, the detector being short-circuited and two lines bus total loop are disconnected.
Brief description of the drawings
By the detailed description for carrying out below in conjunction with the accompanying drawings, above and other objects of the present invention, feature and advantage will
Become more fully apparent, wherein：
Fig. 1 is the system block diagram for showing two lines bus short-circuit protection isolating device of the invention；
Fig. 2 is to show the collection of the first short-circuit signal and protection in short-circuit signal collection of the invention and protection location
The circuit diagram of module；
Fig. 3 is to show the collection of the second short-circuit signal and protection in short-circuit signal collection of the invention and protection location
The circuit diagram of module
Fig. 4 is the circuit diagram for showing two lines bus Transmit-Receive Unit of the invention；
Fig. 5 is the circuit diagram for showing bus voltage collecting unit of the invention；
Fig. 6 is the circuit diagram for showing control unit of the invention and LED indicating members.
Specific embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
Two lines bus be a kind of high reliability, for automatic synchronization coding and decoding communication bus, can be to field node
Data carry out remote serial transmission.
Various detectors (such as temperature detector, smoke alarm) are distributed in operation field (for example, wind-driven generator
Group, various mines) different zones, be connected to controller by two lines bus, detector can be by detection data (such as operation field
Real time status information) be sent to controller via two lines bus, to realize monitor in real time.
In the present invention, whole piece two lines bus circuit communication is caused to be paralysed in order to avoid short circuit occurs in some region of detector
Situation occur, the detector to each region protects by Bus isolation device, by short-circuited region from two lines bus isolation,
So as to realize the protection to the two lines bus total loop of control unit.Meanwhile, in order to reduce the complexity of wiring, Bus isolation device
Employ two lines bus power supply mode.
Fig. 1 is the system block diagram for showing two lines bus short-circuit protection isolating device of the invention.
Reference picture 1, two lines bus short-circuit protection isolating device includes that control unit 11, short-circuit signal is gathered and protection location 12
And two lines bus Transmit-Receive Unit 13.
Short-circuit signal is gathered and protection location 12 may include multiple short-circuit signal collections and protection module, each short-circuit signal
Collection and protection module are connected by branch road two lines bus with a detector.I.e., it is possible to branch out multiple from two lines bus total loop
Branch road two lines bus, each branch road two lines bus can connect a detector.
Each short-circuit signal is gathered and protection module determines whether its detector for being connected is short-circuited, if it is determined that visited
Survey device to be short-circuited, then alarm signal is sent to control unit 11 by short-circuit signal collection and protection module.
If control unit 11 receives alarm signal, control unit 11 exports to short-circuit signal collection control signal
With the corresponding short-circuit signal collection in protection location 12 and protection module, the corresponding short-circuit signal collection and protection module according to
Control signal disconnected branches two lines bus, the detector being short-circuited and two lines bus total loop are disconnected, so as to protect two lines bus
Total loop.
Two lines bus are connected to control unit 11 by two lines bus Transmit-Receive Unit 13 so that control unit 11 is led to each detector
Letter.
Two lines bus short-circuit protection isolating device may also include two lines bus voltage acquisition unit 14.Two lines bus voltage acquisition unit
The bus voltage of 14 collection two lines bus, the bus voltage of two lines bus is converted to the value in preset range, and the electricity that will be changed
Pressure is sent to control unit 11.If control unit 11 determines that the voltage of conversion is higher than predetermined threshold, control unit disconnects branch
The connection of road two lines bus, to protect corresponding detector without damage.
Additionally, two lines bus short-circuit protection isolating device may also include LED (light emitting diode) indicating member 15.LED is indicated
Unit 15 is connected to control unit 11, and when detector is short-circuited, the corresponding LED being included in LED indicating members lights, with
Alarm is sent, shows there is the detector being short-circuited.
Describe the modules unit of two lines bus short-circuit protection isolating device in detail referring to Fig. 2 to Fig. 5.
Fig. 2 is to show the collection of the first short-circuit signal and protection in short-circuit signal collection of the invention and protection location
The circuit diagram of module.
Reference picture 2, the collection of the first short-circuit signal and protection module include relay JK1, positive temperature coefficient (PTC) device
F1, electric bridge and optocoupler O1.
Relay JK1 can use twin coil magnetic latching relay.The action current of twin coil magnetic latching relay is low, and it is touched
The magnetic force that point open/close state is produced in normality by permanent magnet is kept.When the contact of magnetic latching relay need disconnect/
During closure, it is only necessary to which, with just (anti-) DC pulse voltage excitation coil, magnetic latching relay can complete disconnected opening/closing in moment
The State Transferring of conjunction.When contact is in hold mode, coil need not continue to be powered, and can only be protected by the magnetic force of permanent magnet
The state for holding relay is constant.According to the operating feature of magnetic latching relay, direct power taking can just make it from two lines bus
Action, is not required to by externally fed, reduces wiring difficulty.
Reference picture 2, a connection in the tie point bus B US1 and the second branch road bus B US2 in branch road two lines bus
To relay JK1.Although showing that tie point bus B US1 is connected to relay JK1 in Fig. 2, can also be by second
Road bus B US2 is connected to relay JK1.The two ends of detector can be connected respectively to tie point bus B US1 and the second branch road
Bus B US2.
The other end that one end of PTC devices F1 is connected to relay JK1, PTC device F1 is connected to detector, PTC devices
The other end of F1 is applied in branch road two lines bus signal BUS1_Out1.
One end of electric bridge is connected to PTC devices F1.Electric bridge may include the first diode VD1, the second diode VD2, the 3rd
Diode VD3 and the 4th diode VD4, the first diode VD1 connects with the second diode VD2, the 3rd diode VD3 and the 4th
Diode VD4 connects, and the first diode VD1 and the second diode VD2 are in parallel with the 3rd diode VD3 and the 4th diode VD4.
Optocoupler O1 is connected to the other end of electric bridge.
When protected detector is short-circuited, the electric current moment increase of PTC devices F1 is flowed through, cause PTC devices F1
Internal driving increase, cause PTC device F1 two ends voltage difference occur, the voltage difference makes that optocoupler O1's is luminous by electric bridge
Diode current flow, by alarm signal SUBSBAD1 outputs to control unit 11, alarm signal SUBSBAD1 is by elder generation for optocoupler O1
Preceding high level becomes low level.It is after control unit 11 detects alarm signal SUBSBAD1 change low levels, control signal is defeated
Go out to relay JK1, disconnect in the tie point bus B US1 and the second branch road bus B US2 of relay JK1
It is individual, the detector being short-circuited and two lines bus total loop are disconnected, so as to protect two lines bus total loop.Specifically, control letter
The control letter CHANNEL11 of the first control signal CHANNEL10 and second number are may include, can be by the first triode Q1 by the first control
Signal CHANNEL11 processed is sent to relay JK1, can be sent the second control signal CHANNEL10 by the second triode Q2
To relay JK1.Second control signal CHANNEL10 can be used for the operation that resets, and the first control signal CHANNEL11 can be used to break
Open operation.
Fig. 3 is to show the collection of the second short-circuit signal and protection in short-circuit signal collection of the invention and protection location
The circuit diagram of module.
Second short-circuit signal gather and protection module include relay JK2, positive temperature coefficient (PTC) device F2, electric bridge and
Optocoupler O2.One in tie point bus B US1 and the second branch road bus B US2 in branch road two lines bus is connected to relay
Device JK1.Tie point bus B US1 and the second branch road bus B US2 can be connected respectively to the two ends of detector.
The other end that one end of PTC devices F2 is connected to relay JK2, PTC device F2 is connected to detector, is applied in branch
Road two lines bus signal BUS1_Out2.Optocoupler O1 is connected to the other end of electric bridge.
When protected detector is short-circuited, alarm signal SUBSBAD2 outputs are arrived control unit by optocoupler O2
11, alarm signal SUBSBAD2 becomes low level by previous high level.Control unit 11 detects alarm signal SUBSBAD2
After becoming low level, control signal (the control letters of CHANNEL20 and second CHANNEL21) output, to relay JK2, is disconnected
To one in the tie point bus B US1 and the second branch road bus B US2 of relay JK2, by the detector being short-circuited
Disconnected with two lines bus total loop, so as to protect two lines bus total loop.Second control signal CHANNEL20 can be used for the operation that resets,
First control signal CHANNEL21 can be used for opening operation.
Second short-circuit signal is gathered and protection module and the first short-circuit signal collection described by reference picture 2 and protection module
It is structurally and operationally identical, I will not elaborate.
As described above, short-circuit signal collection and protection location 12 may include multiple short-circuit signal collections and protection module.Often
The collection of individual short-circuit signal and protection module it is structurally and operationally identical, for example, the collection of the n-th short-circuit signal and protection module include after
Electrical equipment JKn, positive temperature coefficient (PTC) device Fn, electric bridge and optocoupler On.Each short-circuit signal is gathered and protection module passes through
Branch road two lines bus are connected with a detector.The structure that rice describes the collection of each short-circuit signal and protection module is not repeated herein
And operation.
Fig. 4 is the circuit diagram for showing two lines bus Transmit-Receive Unit of the invention.
Two lines bus Transmit-Receive Unit 13 can using the meter bus slave computer chip with function of supplying power (such as model XY001's
Meter bus slave computer chip), meter bus slave computer chip oneself power consumption is low, using the nonpolarity mode of connection, strong antijamming capability.
Meter bus slave computer chip can provide 5V voltage-stabilized power supplies and be powered with to control unit 11；7th pin of meter bus slave computer chip
Data are received from bus, the serial ports for then transmitting this data to control unit 11 receives pin；Meter bus slave computer chip
The 4th pin the serial data from control unit 11 is sent to bus.As shown in figure 4, two lines bus Transmit-Receive Unit 13 can be wrapped
Electric bridge (being made up of multiple diode VD9-VD13) is included, the output voltage (+20V in Fig. 4) of electric bridge positive pole is used as bus voltage
It is supplied to bus voltage collecting unit which will be described.
Fig. 5 is the circuit diagram for showing bus voltage collecting unit of the invention.
Bus voltage collecting unit 14 includes the first voltage grading resistor R9 and the second voltage grading resistor R10 that are one another in series,
One end ground connection of the first voltage grading resistor R9, the other end of the first voltage grading resistor R9 is connected to the second voltage grading resistor R10's
One end, the other end of the second voltage grading resistor R10 is connected to the positive pole of the electric bridge being included in two lines bus Transmit-Receive Unit 13, described
The output voltage of the positive pole of electric bridge is supplied to bus voltage collecting unit 14 as bus voltage.First voltage grading resistor R9 and
The voltage SPOWER of the node between two voltage grading resistor R10 is sent to control unit 11.
Under normal circumstances, the bus voltage of two lines bus is with different in the range of 12-24V, the bus voltage of load
1/6 partial pressure (that is, the resistance of the second voltage grading resistor R10 is carried out by the first voltage grading resistor R9 and the second voltage grading resistor R10
Value is 5 times of the resistance value of the first voltage grading resistor R9), partial pressure value is made in bus voltage working range less than 5V, so that full
Sufficient control unit 11 carries out the requirement of modulus (AD) sampling.
If as described above, control unit 11 determines that the voltage (voltage after partial pressure) of conversion is higher than predetermined threshold, controlled
The connection of unit disconnected branches two lines bus processed and detector, to protect corresponding detector without damage.
Fig. 6 is the circuit diagram for showing control unit of the invention and LED indicating members.
Control unit 11 can be using single-chip microcomputer, microprocessor, programmable logic controller (PLC) etc..In Figure 5, control unit 11
Employ single-chip microcomputer PIC16F690-I/SS.Control unit 11 can be detected to the short-circuit condition of multiple detectors.
As described above, when protected detector is short-circuited, control unit 11 can be by control signal output to multiple
Short-circuit signal gathers the branch road two lines bus connected with corresponding in protection module, the detector that disconnection is short-circuited, with
The detector being short-circuited and two lines bus total loop are disconnected, so as to protect two lines bus total loop.
LED indicating members 15 may include multiple LED of parallel connection.When protected detector is short-circuited, control unit
11 can apply control signals to corresponding in multiple LED so that a corresponding LED lights, to send alarm.It is many
It is individual can LED emission different colours light, for example, a LED can launch green glow, the 2nd LED can launch feux rouges etc., with show occur
Region where the detector of short circuit.
Describe to realize that two lines bus short circuit is protected using above-mentioned two lines bus short-circuit protection isolating device of the invention below
The method for protecting isolation, methods described may include following steps：Each short-circuit signal is gathered and protection module determines what it was connected
Whether detector is short-circuited；If it is determined that detector is short-circuited, then short-circuit signal collection and protection module are by alarm signal
It is sent to control unit；If control unit receives alarm signal, control signal output is arrived the multiple by control unit
Short-circuit signal is gathered and corresponding in protection module；The corresponding short-circuit signal collection and protection module are according to control
Signal disconnected branches two lines bus, the detector being short-circuited and two lines bus total loop are disconnected.
In the present invention, use PTC devices and optocoupler to realize the detection to detector short circuit, use magnetic holding
Relay realizes the protection to two lines bus total loop, has used LED to indicate short-circuit condition, using magnetic latching relay
Low power consumption characteristic, built-in multichannel defencive function circuit, reduces use cost.Two lines bus short-circuit protection of the invention every
Various operation fields (for example, wind power generating set, various mines etc.) are can be widely applied to from device, implementing monitoring can be improved
Stability and security.
Although the present invention, those skilled in the art are particularly shown and described with reference to its exemplary embodiment
It should be understood that in the case where the spirit and scope of the present invention that claim is limited are not departed from, form can be carried out to it
With the various changes in details.
Claims (10)
1. a kind of two lines bus short-circuit protection isolating device, including：
Control unit；
Short-circuit signal gather and protection location, including multiple short-circuit signals collection and protection module, each short-circuit signal collection and
Protection module is connected by branch road two lines bus with a detector, and the collection of each short-circuit signal and protection module determine that it is connected
Detector whether be short-circuited, if it is determined that detector is short-circuited, then short-circuit signal collection and protection module are by alarm signal
Number it is sent to control unit；
Two lines bus are connected to control unit by two lines bus Transmit-Receive Unit so that control unit communicates with detector,
Wherein, if control unit receives alarm signal, control unit believes control signal output to the multiple short circuit
Corresponding one in number collection and protection module, the corresponding short-circuit signal collection and protection module are disconnected according to control signal
Spending road two lines bus, the detector being short-circuited and two lines bus total loop are disconnected,
Wherein, the collection of each short-circuit signal and protection module include：
Relay, one in tie point bus and the second branch road bus in branch road two lines bus is connected to the relay；
Positive temperature coefficient device, one end of positive temperature coefficient device is connected to relay, and the other end of positive temperature coefficient device connects
It is connected to detector；
Electric bridge, one end of electric bridge is connected to positive temperature coefficient device；
Optocoupler, is connected to the other end of electric bridge.
2. two lines bus short-circuit protection isolating device according to claim 1, also includes：Two lines bus voltage acquisition unit, adopts
Collect the bus voltage of two lines bus, the bus voltage of two lines bus is converted to the value in preset range, and the voltage hair that will be changed
It is sent to control unit.
3. two lines bus short-circuit protection isolating device according to claim 2, wherein, if the control unit determine that the electricity of conversion
Pressure is higher than predetermined threshold, then the connection of control unit disconnected branches two lines bus and detector.
4. two lines bus short-circuit protection isolating device according to claim 2, also includes：Light emitting diode indicating member, even
Control unit is connected to, when detector is short-circuited, the corresponding light emitting diode hair in light emitting diode indicating member is included in
Light, to send alarm.
5. two lines bus short-circuit protection isolating device according to claim 1, wherein, when detector is short-circuited, flow through
The electric current increase of positive temperature coefficient device, causes the internal driving of positive temperature coefficient device to increase, and causes positive temperature coefficient device
There is voltage difference in two ends, and the voltage difference makes the LEDs ON of optocoupler by electric bridge, and optocoupler is by alarm signal
To control unit, control unit is by control signal output to relay, and the tie point for disconnecting relay is total for number output
One in line and the second branch road bus, the detector being short-circuited and two lines bus total loop are disconnected.
6. two lines bus short-circuit protection isolating device according to claim 2, wherein, two lines bus voltage acquisition unit includes that
First voltage grading resistor and the second voltage grading resistor of this series connection, one end ground connection of the first voltage grading resistor, the first divider resistance
The other end of device is connected to one end of the second voltage grading resistor, and the other end of the second voltage grading resistor is connected to and is included in two lines bus
The positive pole of the electric bridge in Transmit-Receive Unit, the output voltage of the positive pole of the electric bridge is supplied to two lines bus voltage to adopt as bus voltage
Collection unit, the voltage of the node between the first voltage grading resistor and the second voltage grading resistor is sent to control unit.
7. two lines bus short-circuit protection isolating device according to claim 6, wherein, the resistance value of the second voltage grading resistor is
5 times of the resistance value of the first voltage grading resistor.
8. two lines bus short-circuit protection isolating device according to claim 4, wherein, light emitting diode indicating member is included simultaneously
Multiple light emitting diodes of connection, when detector is short-circuited, control unit applies control signals to the multiple diode
In corresponding one so that a corresponding lumination of light emitting diode, to send alarm.
9. a kind of method that use two lines bus short-circuit protection isolating device realizes the isolation of two lines bus short-circuit protection, the two lines bus are short
Road protective separation device includes control unit, short-circuit signal collection and protection location and two lines bus Transmit-Receive Unit, and short-circuit signal is adopted
Collection and protection location include multiple short-circuit signal collections and protection module, and it is single that two lines bus are connected to control by two lines bus Transmit-Receive Unit
Unit, methods described includes：
Each short-circuit signal is gathered and protection module determines whether its detector for being connected is short-circuited；
If it is determined that detector is short-circuited, then alarm signal is sent to control unit by short-circuit signal collection and protection module；
If control unit receives alarm signal, control unit exports to the collection of the multiple short-circuit signal control signal
One corresponding with protection module；
The corresponding short-circuit signal collection and protection module will be short-circuited according to control signal disconnected branches two lines bus
Detector and two lines bus total loop disconnect,
Wherein, the collection of each short-circuit signal and protection module include：Relay, the tie point bus in branch road two lines bus and
One in two branch road buses is connected to the relay；Positive temperature coefficient device, one end of positive temperature coefficient device is connected to
Relay, the other end of positive temperature coefficient device is connected to detector；Electric bridge, one end of electric bridge is connected to positive temperature coefficient device
Part；Optocoupler, is connected to the other end of electric bridge.
10. use two lines bus short-circuit protection isolating device according to claim 9 realizes the isolation of two lines bus short-circuit protection
Method, wherein, when detector is short-circuited, the electric current increase of positive temperature coefficient device is flowed through, cause positive temperature coefficient device
Internal driving increase, cause positive temperature coefficient device two ends voltage difference occur, the voltage difference makes optocoupler by electric bridge
LEDs ON, optocoupler by alarm signal output to control unit, control unit by control signal output arrive after
Electrical equipment, disconnects in the tie point bus and the second branch road bus of relay, by the detection being short-circuited
Device disconnects with two lines bus total loop.
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| CN201110439882.8A CN102437549B (en) | 2011-12-23 | 2011-12-23 | Two lines bus short-circuit protection isolating device and the method for two lines bus short-circuit protection isolation |
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| CN201110439882.8A CN102437549B (en) | 2011-12-23 | 2011-12-23 | Two lines bus short-circuit protection isolating device and the method for two lines bus short-circuit protection isolation |
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| CN108281991A (en) * | 2017-01-06 | 2018-07-13 | 中兴通讯股份有限公司 | A kind of circuit protection circuit, method and power cable |
| CN109962449A (en) * | 2017-12-26 | 2019-07-02 | 宁夏赛文技术股份有限公司 | A kind of short-circuit protection and overload detection circuit for MBus main website circuit |
| CN112650089A (en) * | 2020-09-03 | 2021-04-13 | 上海明厦物联网科技有限公司 | Design circuit integrating two-bus short circuit detection and isolation and detection method |
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