CN102437549A - Two-bus short-circuit protective isolation device and method - Google Patents
Two-bus short-circuit protective isolation device and method Download PDFInfo
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- CN102437549A CN102437549A CN2011104398828A CN201110439882A CN102437549A CN 102437549 A CN102437549 A CN 102437549A CN 2011104398828 A CN2011104398828 A CN 2011104398828A CN 201110439882 A CN201110439882 A CN 201110439882A CN 102437549 A CN102437549 A CN 102437549A
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Abstract
The invention provides a two-bus short-circuit protective isolation device and method. The device comprises a control unit, a short-circuit signal acquisition and protection unit and a two-bus transceiving unit, wherein, the short-circuit signal acquisition and protection unit comprises a plurality of short-circuit signal acquisition and protection modules, and each short-circuit signal acquisition and protection module is connected with a detector through two branch buses; and the two buses are connected to the control unit through the two-bus transceiving unit so that the control unit communicates with the detectors. The two-bus short-circuit protective isolation method comprises the following steps: each short-circuit signal acquisition and protection module determines whether short circuit occurs in the detector connected with the module; if determining that short circuit occurs in the detector, each short-circuit signal acquisition and protection module sends an alarm signal to the control unit; if the control unit receives the alarm signal, the control unit outputs a control signal to the corresponding one of the plurality of the short-circuit signal acquisition and protection modules; and the corresponding short-circuit signal acquisition and protection module disconnects the two branch buses according to the control signal so as to disconnect the short-circuited detectors and an overall circuit of the two buses.
Description
Technical field
The present invention relates to the method that the protection of a kind of two bus short circuits protection spacer assembly, two bus short circuits is isolated; This two bus short circuits protection spacer assembly makes protective current to adjust according to the size of protection zone equipment work electric current, can be applicable to the temperature detection device in the high-power grid type fan intelligent fire-fighting system, the short-circuit protection of smoke alarm.
Background technology
In recent years, the MW class wind turbine group develops rapidly.The fire-fighting equipment of wind turbine generator all is hand fire extinguisher basically on the road at present.For this reason, in case wind turbine generator breaking out of fire under unmanned situation may face the accident of all being burnt, cause great economic loss.Therefore a cover is stable, the fan intelligent fire-fighting system is even more important for the wind-driven generator group equipment reliably.
Usually adopt the two line communication mode between fan intelligent fire-fighting system controller and detector, to communicate; Detector is distributed in the zones of different of wind turbine generator; When short circuit appears in a certain area detection device, can cause whole piece two bus loop communications paralysis.
Therefore, need design with lower cost meet the requirements, strong interference immunity, short-circuit protection function complete protection spacer assembly.
Summary of the invention
According to an aspect of the present invention, a kind of two bus short circuits protection spacer assembly is provided, this device comprises: control unit; Short-circuit signal is gathered and protected location; Comprise a plurality of short-circuit signal collections and protection module; The collection of each short-circuit signal is connected with a detector through branch road two buses with protection module; Each short-circuit signal collection confirms with protection module whether its detector that is connected is short-circuited, if confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit with alarm signal; Two bus Transmit-Receive Units; Two buses are connected to control unit, make control unit communicate by letter, wherein with detector; If control unit receives alarm signal; Then control unit outputs to corresponding in said a plurality of short-circuit signal collection and the protection module with control signal, and a said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses, so that detector that is short-circuited and two bus total loops are broken off.
Two bus short circuits protections spacer assembly also can comprise: two bus voltage collecting units, gather the bus voltage of two buses, and convert the bus voltage of two buses in the preset range value, and the voltage of conversion is sent to control unit.
If control unit confirms the voltage of conversion and is higher than predetermined threshold, but being connected of control unit disconnected branches two buses and detector then.
Two bus short circuits protection spacer assembly also can comprise: the light-emitting diode indicating member, be connected to control unit, and when detector is short-circuited, be included in the corresponding lumination of light emitting diode in the light-emitting diode indicating member, to give the alarm.
Each short-circuit signal collection and protection module can comprise: relay, and one in the first branch road bus in branch road two buses and the second branch road bus is connected to said relay; Positive temperature coefficient device, an end of positive temperature coefficient device is connected to relay, and the other end of positive temperature coefficient device is connected to detector; Electric bridge, an end of electric bridge is connected to positive temperature coefficient device; Optocoupler is connected to the other end of electric bridge.
When detector is short-circuited; The electric current of positive temperature coefficient device of flowing through increases; Cause the internal driving of positive temperature coefficient device to increase, cause that voltage difference appears in the positive temperature coefficient device two ends, said voltage difference makes the light-emitting diode conducting of optocoupler through electric bridge; Optocoupler outputs to control unit with alarm signal; Control unit outputs to relay with control signal, breaks off in the first branch road bus be connected to relay and the second branch road bus, with detector that is short-circuited and the disconnection of two bus total loops.
Two bus voltage collecting units can comprise first voltage grading resistor and second voltage grading resistor that is one another in series; One end ground connection of first voltage grading resistor; The other end of first voltage grading resistor is connected to an end of second voltage grading resistor; The other end of second voltage grading resistor is connected to the positive pole that is included in the electric bridge in the two bus Transmit-Receive Units; The output voltage of the positive pole of said electric bridge offers the bus voltage collecting unit as bus voltage, and the voltage of the node between first voltage grading resistor and second voltage grading resistor is sent to control unit.
The resistance value of second voltage grading resistor can be 5 times of resistance value of first voltage grading resistor.
The light-emitting diode indicating member can comprise a plurality of light-emitting diodes of parallel connection, and when detector was short-circuited, control unit was applied to corresponding in said a plurality of diode with control signal, makes a said corresponding lumination of light emitting diode, to give the alarm.
According to a further aspect in the invention; Provide a kind of use two bus short circuits protection spacer assembly to realize the method that the protection of two bus short circuits is isolated; Said two bus short circuits protection spacer assembly comprises control unit, short-circuit signal collection and protected location and two bus Transmit-Receive Units; Short-circuit signal collection and protected location comprise a plurality of short-circuit signal collections and protection module; Two bus Transmit-Receive Units are connected to control unit with two buses, and said method comprises: each short-circuit signal collection confirms with protection module whether its detector that is connected is short-circuited; If confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit with alarm signal; If control unit receives alarm signal, then control unit outputs to corresponding in said a plurality of short-circuit signal collection and the protection module with control signal; A said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses, so that detector that is short-circuited and two bus total loops are broken off.
Each short-circuit signal collection and protection module can comprise: relay, and one in the first branch road bus in branch road two buses and the second branch road bus is connected to said relay; Positive temperature coefficient device, an end of positive temperature coefficient device is connected to relay, and the other end of positive temperature coefficient device is connected to detector; Electric bridge, an end of electric bridge is connected to positive temperature coefficient device; Optocoupler is connected to the other end of electric bridge, wherein; When detector was short-circuited, the electric current of the positive temperature coefficient device of flowing through increased, and caused the internal driving of positive temperature coefficient device to increase; Cause that voltage difference appears in the positive temperature coefficient device two ends; Said voltage difference makes the light-emitting diode conducting of optocoupler through electric bridge, and optocoupler outputs to control unit with alarm signal, and control unit outputs to relay with control signal; Disconnection is connected in the first branch road bus and the second branch road bus of relay, so that detector that is short-circuited and two bus total loops are broken off.
Description of drawings
Through the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention, characteristics and advantage will become apparent, wherein:
Fig. 1 is the system block diagram that illustrates according to two bus short circuits protection spacer assembly of the present invention;
Fig. 2 illustrates according to the first short-circuit signal collection in short-circuit signal collection of the present invention and the protected location and the circuit diagram of protection module;
Fig. 3 illustrates according to the second short-circuit signal collection in short-circuit signal collection of the present invention and the protected location and the circuit diagram of protection module
Fig. 4 is the circuit diagram that illustrates according to two bus Transmit-Receive Units of the present invention;
Fig. 5 is the circuit diagram that illustrates according to bus voltage collecting unit of the present invention;
Fig. 6 is the circuit diagram that illustrates according to control unit of the present invention and LED indicating member.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
Two buses are a kind of high reliability, are used for the bus that automatic synchronous coding is separated code communication, can carry out remote serial transmission to the data of field node.
Range detector (such as temperature detection device, smoke alarm) (for example is distributed in operation field; Wind turbine generator, various mine) zones of different; Be connected to controller through two buses; Detector can send to controller via two buses with detection data (the for example real-time status information of operation field), to realize real-time monitoring.
In the present invention; Short circuit occurring for fear of a certain area detection device causes the situation of whole piece two bus loop communications paralysis to take place; Each area detection device is protected through the bus spacer assembly; Short-circuited region is isolated from two buses, thereby realize protection two bus total loops of control unit.Simultaneously, in order to reduce the complexity of wiring, the bus spacer assembly has adopted two bus-powered modes.
Fig. 1 is the system block diagram that illustrates according to two bus short circuits protection spacer assembly of the present invention.
With reference to Fig. 1, two bus short circuits protection spacer assembly comprises control unit 11, short-circuit signal collection and protected location 12 and two bus Transmit-Receive Units 13.
Short-circuit signal collection and protected location 12 can comprise a plurality of short-circuit signal collections and protection module, and the collection of each short-circuit signal is connected with a detector through branch road two buses with protection module.That is, can divide expenditure a plurality of branch road two buses from two bus total loops, each branch road two bus can connect a detector.
Each short-circuit signal collection confirms with protection module whether its detector that is connected is short-circuited, if confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit 11 with alarm signal.
If control unit 11 receives alarm signal; Then control unit 11 outputs to corresponding short-circuit signal collection and protection module in short-circuit signal collection and the protected location 12 with control signal; Said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses; So that the detector that is short-circuited and two bus total loops are broken off, thereby protect two bus total loops.
Two bus Transmit-Receive Units 13 are connected to control unit 11 with two buses, make control unit 11 communicate by letter with each detector.
Two bus short circuits protection spacer assembly also can comprise two bus voltage collecting units 14.Two bus voltage collecting units 14 are gathered the bus voltage of two buses, convert the bus voltage of two buses in the preset range value, and the voltage of conversion is sent to control unit 11.If control unit 11 confirms that the voltage of conversion is higher than predetermined threshold, the then connection of control unit disconnected branches two buses is not damaged to protect corresponding detector.
In addition, two bus short circuits protection spacer assembly also can comprise LED (light-emitting diode) indicating member 15.LED indicating member 15 is connected to control unit 11, and when detector was short-circuited, the corresponding LED that is included in the LED indicating member was luminous, to give the alarm, shows to have the detector that is short-circuited.
Describe each modular unit of two bus short circuits protection spacer assembly below in detail with reference to Fig. 2 to Fig. 5.
Fig. 2 illustrates according to the first short-circuit signal collection in short-circuit signal collection of the present invention and the protected location and the circuit diagram of protection module.
With reference to Fig. 2, the first short-circuit signal collection and protection module comprise relay J K1, positive temperature coefficient (PTC) device F1, electric bridge and optocoupler O1.
Relay J K1 can adopt the twin coil magnetic latching relay.The operating current of twin coil magnetic latching relay is low, and its contact open/close state is kept by the magnetic force that permanent magnet produces when normality.When the contact of magnetic latching relay needs cut-off/close, only need to use just (instead) dc pulse voltage excitation coil, magnetic latching relay just can have been accomplished the state exchange of cut-off/close in moment.When the contact was in hold mode, coil need not continue energising, but only the magnetic force through permanent magnet is constant with regard to the state of latching relay.According to the operating feature of magnetic latching relay, can just can make its action from direct power taking on two buses, need not pass through externally fed, reduced the wiring difficulty.
With reference to Fig. 2, one among the first branch road bus B US1 in branch road two buses and the second branch road bus B US2 is connected to relay J K1.Be connected to relay J K1 though the first branch road bus B US1 has been shown among Fig. 2, also can the second branch road bus B US2 be connected to relay J K1.The two ends of detector can be connected respectively to the first branch road bus B US1 and the second branch road bus B US2.
The end of PTC device F1 is connected to relay J K1, and the other end of PTC device F1 is connected to detector, and the other end of PTC device F1 is applied in branch road two bus signals BUS1_Out1.
One end of electric bridge is connected to PTC device F1.Electric bridge can comprise 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 series connection, the first diode VD1 and the second diode VD2 are parallelly connected 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; Flow through electric current moment of PTC device F1 increases; Cause the internal driving of PTC device F1 to increase, cause that voltage difference appears in PTC device F1 two ends, this voltage difference makes the light-emitting diode conducting of optocoupler O1 through electric bridge; Optocoupler O1 outputs to control unit 11 with alarm signal SUBSBAD1, and alarm signal SUBSBAD1 becomes low level by previous high level.After control unit 11 detects alarm signal SUBSBAD1 step-down level; Control signal is outputed to relay J K1; Disconnection is connected among the first branch road bus B US1 and the second branch road bus B US2 of relay J K1; So that the detector that is short-circuited and two bus total loops are broken off, thereby protect two bus total loops.Particularly; Control signal can comprise the first control signal CHANNEL10 and the second control letter CHANNEL11; Can the first control signal CHANNEL11 be sent to relay J K1 through the first triode Q1, can the second control signal CHANNEL10 be sent to relay J K1 through the second triode Q2.The second control signal CHANNEL10 can be used for reset operation, and the first control signal CHANNEL11 can be used for opening operation.
Fig. 3 illustrates according to the second short-circuit signal collection in short-circuit signal collection of the present invention and the protected location and the circuit diagram of protection module.
The second short-circuit signal collection and protection module comprise relay J K2, positive temperature coefficient (PTC) device F2, electric bridge and optocoupler O2.One among the first branch road bus B US1 in branch road two buses and the second branch road bus B US2 is connected to relay J K1.The first branch road bus B US1 and the second branch road bus B US2 can be connected respectively to the two ends of detector.
The end of PTC device F2 is connected to relay J K2, and the other end of PTC device F2 is connected to detector, is applied in branch road two bus signals BUS1_Out2.Optocoupler O1 is connected to the other end of electric bridge.
When protected detector was short-circuited, optocoupler O2 outputed to control unit 11 with alarm signal SUBSBAD2, and alarm signal SUBSBAD2 becomes low level by previous high level.After control unit 11 detects alarm signal SUBSBAD2 step-down level; (CHANNEL20 and the second control letter CHANNEL21) outputs to relay J K2 with control signal; Disconnection is connected among the first branch road bus B US1 and the second branch road bus B US2 of relay J K2; So that the detector that is short-circuited and two bus total loops are broken off, thereby protect two bus total loops.The second control signal CHANNEL20 can be used for reset operation, and the first control signal CHANNEL21 can be used for opening operation.
The second short-circuit signal collection and protection module are identical with operation with structure with reference to described first short-circuit signal collection of Fig. 2 and protection module, no longer detail here.
As stated, short-circuit signal collection and protected location 12 can comprise a plurality of short-circuit signal collections and protection module.It is identical with operation with the structure of protection module that each short-circuit signal is gathered, and for example, collection of n short-circuit signal and protection module comprise relay J Kn, positive temperature coefficient (PTC) device Fn, electric bridge and optocoupler On.The collection of each short-circuit signal is connected with a detector through branch road two buses with protection module.Here no longer repeat rice and describe the structure and the operation of each short-circuit signal collection and protection module.
Fig. 4 is the circuit diagram that illustrates according to two bus Transmit-Receive Units of the present invention.
Two bus Transmit-Receive Units 13 can adopt the meter bus slave computer chip (for example model is the meter bus slave computer chip of XY001) of band function of supplying power, and meter bus slave computer chip oneself power consumption is low, adopts the nonpolarity mode of connection, and antijamming capability is strong.The meter bus slave computer chip can provide the 5V stabilized voltage power supply to supply power to control unit 11; The 7th pin of meter bus slave computer chip is received data from bus interface, then these data is sent to the serial ports reception pin of control unit 11; The 4th pin of the meter bus slave computer chip serial data of Self Control unit 11 in the future sends to bus.As shown in Figure 4, two bus Transmit-Receive Units 13 can comprise electric bridge (being made up of a plurality of diode VD9-VD13), the output voltage of electric bridge positive pole (among Fig. 4+20V) offer the following bus voltage collecting unit that will describe as bus voltage.
Fig. 5 is the circuit diagram that illustrates according to bus voltage collecting unit of the present invention.
Bus voltage collecting unit 14 comprises the first voltage grading resistor R9 and the second voltage grading resistor R10 that is one another in series; The end ground connection of the first voltage grading resistor R9; The other end of the first voltage grading resistor R9 is connected to the end of the second voltage grading resistor R10; The other end of the second voltage grading resistor R10 is connected to the positive pole that is included in the electric bridge in the two bus Transmit-Receive Units 13, and the output voltage of the positive pole of said electric bridge offers bus voltage collecting unit 14 as bus voltage.The voltage SPOWER of the node between the first voltage grading resistor R9 and the second voltage grading resistor R10 is sent to control unit 11.
Under normal circumstances; In the scope of the bus voltage of two buses along with the 12-24V that do not coexist of load; Bus voltage carries out 1/6 dividing potential drop (promptly through the first voltage grading resistor R9 and the second voltage grading resistor R10; The resistance value of the second voltage grading resistor R10 is 5 times of resistance value of the first voltage grading resistor R9), in the bus voltage working range, make partial pressure value, thereby satisfy the requirement that control unit 11 carries out modulus (AD) sampling less than 5V.
As stated, be higher than predetermined threshold, then being connected of control unit disconnected branches two buses and detector, be not damaged to protect corresponding detector if control unit 11 is confirmed the voltages (voltage after partial) of conversion.
Fig. 6 is the circuit diagram that illustrates according to control unit of the present invention and LED indicating member.
As stated; When protected detector is short-circuited; Control unit 11 can output to corresponding in a plurality of short-circuit signal collections and the protection module with control signal; The branch road that detector connected two buses that disconnection is short-circuited so that the said detector that is short-circuited and two bus total loops are broken off, thereby are protected two bus total loops.
Use above-mentioned two bus short circuits protection spacer assembly according to the present invention is described below realizes the method that the protection of two bus short circuits is isolated, said method can comprise the steps: that each short-circuit signal collection and protection module confirm whether its detector that is connected is short-circuited; If confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit with alarm signal; If control unit receives alarm signal, then control unit outputs to corresponding in said a plurality of short-circuit signal collection and the protection module with control signal; A said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses, so that detector that is short-circuited and two bus total loops are broken off.
In the present invention; Used PTC device and optocoupler to realize detection to the detector short circuit; Used magnetic latching relay to realize protection, used LED that short-circuit condition is indicated, utilized the low-power consumption characteristic of magnetic latching relay two bus total loops; Built-in multichannel defencive function circuit has reduced use cost.Two bus short circuits protection spacer assembly according to the present invention can be widely used in various operation fields (for example, wind turbine generator, various mines etc.), can improve and implement stability in monitoring and fail safe.
Although specifically shown and described the present invention with reference to its exemplary embodiment; But it should be appreciated by those skilled in the art; Under the situation of the spirit and scope of the present invention that do not break away from claim and limited, can carry out the various changes on form and the details to it.
Claims (11)
1. a bus short circuit is protected spacer assembly, comprising:
Control unit;
Short-circuit signal is gathered and protected location; Comprise a plurality of short-circuit signal collections and protection module; The collection of each short-circuit signal is connected with a detector through branch road two buses with protection module; Each short-circuit signal collection confirms with protection module whether its detector that is connected is short-circuited, if confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit with alarm signal;
Two bus Transmit-Receive Units are connected to control unit with two buses, make control unit communicate by letter with detector,
Wherein, If control unit receives alarm signal; Then control unit outputs to corresponding in said a plurality of short-circuit signal collection and the protection module with control signal; A said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses, so that detector that is short-circuited and two bus total loops are broken off.
2. two bus short circuits protection spacer assembly according to claim 1; Also comprise: two bus voltage collecting units; Gather the bus voltage of two buses, convert the bus voltage of two buses in the preset range value, and the voltage of conversion is sent to control unit.
3. two bus short circuits according to claim 2 protection spacer assembly wherein, is higher than predetermined threshold if control unit is confirmed the voltage of conversion, and then control unit disconnected branches two buses and detector is connected.
4. two bus short circuits protection spacer assembly according to claim 2; Also comprise: the light-emitting diode indicating member is connected to control unit, when detector is short-circuited; Be included in the corresponding lumination of light emitting diode in the light-emitting diode indicating member, to give the alarm.
5. two bus short circuits protection spacer assembly according to claim 1, wherein, each short-circuit signal collection and protection module comprise:
Relay, one in the first branch road bus in branch road two buses and the second branch road bus is connected to said relay;
Positive temperature coefficient device, an end of positive temperature coefficient device is connected to relay, and the other end of positive temperature coefficient device is connected to detector;
Electric bridge, an end of electric bridge is connected to positive temperature coefficient device;
Optocoupler is connected to the other end of electric bridge.
6. two bus short circuits protection spacer assembly according to claim 5, wherein, when detector is short-circuited; The electric current of positive temperature coefficient device of flowing through increases; Cause the internal driving of positive temperature coefficient device to increase, cause that voltage difference appears in the positive temperature coefficient device two ends, said voltage difference makes the light-emitting diode conducting of optocoupler through electric bridge; Optocoupler outputs to control unit with alarm signal; Control unit outputs to relay with control signal, breaks off in the first branch road bus be connected to relay and the second branch road bus, with detector that is short-circuited and the disconnection of two bus total loops.
7. two bus short circuits protection spacer assembly according to claim 2; Wherein, Two bus voltage collecting units comprise first voltage grading resistor and second voltage grading resistor that is one another in series; One end ground connection of first voltage grading resistor, the other end of first voltage grading resistor is connected to an end of second voltage grading resistor, and the other end of second voltage grading resistor is connected to the positive pole that is included in the electric bridge in the two bus Transmit-Receive Units; The output voltage of the positive pole of said electric bridge offers the bus voltage collecting unit as bus voltage, and the voltage of the node between first voltage grading resistor and second voltage grading resistor is sent to control unit.
8. two bus short circuits according to claim 7 protection spacer assembly, wherein, the resistance value of second voltage grading resistor is 5 times of resistance value of first voltage grading resistor.
9. two bus short circuits protection spacer assembly according to claim 4; Wherein, The light-emitting diode indicating member comprises a plurality of light-emitting diodes of parallel connection, and when detector was short-circuited, control unit was applied to corresponding in said a plurality of diode with control signal; Make a said corresponding lumination of light emitting diode, to give the alarm.
10. one kind is used two bus short circuits protection spacer assembly to realize the method that the protection of two bus short circuits is isolated; Said two bus short circuits protection spacer assembly comprises control unit, short-circuit signal collection and protected location and two bus Transmit-Receive Units; Short-circuit signal collection and protected location comprise a plurality of short-circuit signal collections and protection module; Two bus Transmit-Receive Units are connected to control unit with two buses, and said method comprises:
Each short-circuit signal collection confirms with protection module whether its detector that is connected is short-circuited;
If confirm that detector is short-circuited, then short-circuit signal collection and protection module send to control unit with alarm signal;
If control unit receives alarm signal, then control unit outputs to corresponding in said a plurality of short-circuit signal collection and the protection module with control signal;
A said corresponding short-circuit signal collection and protection module are according to control signal disconnected branches two buses, so that detector that is short-circuited and two bus total loops are broken off.
11. two bus short circuits protection partition method according to claim 10, wherein, each short-circuit signal collection and protection module comprise: relay, and one in the first branch road bus in branch road two buses and the second branch road bus is connected to said relay; Positive temperature coefficient device, an end of positive temperature coefficient device is connected to relay, and the other end of positive temperature coefficient device is connected to detector; Electric bridge, an end of electric bridge is connected to positive temperature coefficient device; Optocoupler is connected to the other end of electric bridge,
Wherein, When detector was short-circuited, the electric current of the positive temperature coefficient device of flowing through increased, and caused the internal driving of positive temperature coefficient device to increase; Cause that voltage difference appears in the positive temperature coefficient device two ends; Said voltage difference makes the light-emitting diode conducting of optocoupler through electric bridge, and optocoupler outputs to control unit with alarm signal, and control unit outputs to relay with control signal; Disconnection is connected in the first branch road bus and the second branch road bus of relay, so that detector that is short-circuited and two bus total loops are broken off.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN102437549B CN102437549B (en) | 2017-06-30 |
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| 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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| JP2020504993A (en) * | 2017-01-06 | 2020-02-13 | 中興通訊股▲ふん▼有限公司Ｚｔｅ Ｃｏｒｐｏｒａｔｉｏｎ | Line protection circuit, method and power supply 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 |
Also Published As
| Publication number | Publication date |
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| CN102437549B (en) | 2017-06-30 |
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