CN207664592U - Over-current detection applied to fire alarm control system protects circuit - Google Patents
Over-current detection applied to fire alarm control system protects circuit Download PDFInfo
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- CN207664592U CN207664592U CN201721872773.4U CN201721872773U CN207664592U CN 207664592 U CN207664592 U CN 207664592U CN 201721872773 U CN201721872773 U CN 201721872773U CN 207664592 U CN207664592 U CN 207664592U
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Abstract
The utility model discloses a kind of over-current detections applied to fire alarm control system to protect circuit; including microcontroller; with electric current input pin, power pins, analog voltage output pin, the current detecting chip D5 and comparator D4 that filter pin, the first photoelectric coupled circuit D9, the second photoelectric coupled circuit D10 and half-bridge drive integrated circuit.The purpose of quick self-protection after the utility model realizes the enhancing of system drive ability and breaks down well.Therefore, the utility model is suitable for popularization and application.
Description
Technical field
The utility model is related to technical field of fire control, and in particular to be a kind of mistake applied to fire alarm control system
Stream detection protection circuit.
Background technology
Self-protection mode of the existing fire alarm control system circuit after overcurrent occurs, substantially by hardware
It realizes, is arranged for example, by using self-recovery fuse combination peripheral circuit.Existing this self-protection mode, major defect exist
In：
(1) driving capability is insufficient.Existing fire alarm control system, because there is self-recovery fuses in circuit for it
(it is with certain resistance value), and without the function of realizing Current amplifier, so driving capability is not strong (about 500mA or so), nothing
Method loads larger equipment.
(2) time for detecting overcurrent and protection consuming is longer.The operating principle of self-recovery fuse is a kind of moving for energy
State balances, and flows through the electric current of self-recovery fuse because the relationship of heating effect of current will produce a degree of heat, works as self- recoverage
When fuse is in low resistive state, self-recovery fuse is failure to actuate；When flowing through the electric current increase of self-recovery fuse element, from
Higher temperature can be reached by restoring fuse, at this point, self-recovery fuse can be in high resistant guard mode, the increase of impedance limits
Electric current so that electric current drastically declines within a very short time, to play the role of circuit arrangement protection.It is not difficult to find out, when being
When overcurrent occurs for system circuit, self-recovery fuse resistance plays the disconnected resistance function of current and the consuming regular hour is needed (about to need 1~2
Second), to increase the time of failure removal response.
Therefore, it is necessary to a kind of over-current detection and protection circuit of software and hardware combining be designed, to enhance fire alarm control
While system drive ability processed, shorten the protection response time after overcurrent.
Utility model content
Deficiency in view of the above technology, the utility model provide a kind of overcurrent inspection applied to fire alarm control system
Protection circuit is surveyed, can be shortened system while enhancing fire alarm control system driving capability and the protection sound after overcurrent occurs
Between seasonable.
To achieve the above object, the technical solution adopted in the utility model is as follows：
Over-current detection applied to fire alarm control system protects circuit, including microcontroller, have electric current input pin,
Power pins, analog voltage output pin, the current detecting chip D5 and comparator D4 that filter pin, the first photoelectric coupled circuit
D9, the second photoelectric coupled circuit D10 and half-bridge drive integrated circuit；
The electric current input pin of the current detecting chip D5 meets Ucc+；The power pins of current detecting chip D5 and filtering
Pin meets VDD；Analog voltage output pin meets the IN of comparator D4-End, and in analog voltage output pin and comparator
The IN of D4-Capacitance C16 is connected between end, capacitance C16 accesses microcontroller by lead, and capacitance C16 is acquired by microcontroller
Voltage signal；
The IN of the comparator D4+End meets VDD through resistance R15, while being also grounded through resistance R16；Comparator D4 output ends
Access the external interrupt of microcontroller；
The first photoelectric coupled circuit D9 connects the pulse input end and microcontroller of half-bridge drive integrated circuit simultaneously, and meets 12V+
And VDD；
The second photoelectric coupled circuit D10 connects microcontroller, and the SD signals of half-bridge drive integrated circuit are connect by triode V11
Input terminal, and meet 12V+And VDD；Triode V11 emitters meet Ucc-；
The half-bridge drive integrated circuit connects the electric current input pin of current detecting chip D5.
Specifically, the first photoelectric coupled circuit D9 and the second photoelectric coupled circuit D10 include a light emitting diode, one
Photodiode and a NPN type triode, light emitting diode match each other with photodiode, and photodiode with
The base stage of NPN type triode connects, wherein light emitting diode anode meets VDD, and cathode connects microcontroller；Photodiode anode connects
12V+, cathode connects the base stage of NPN type triode；The collector of NPN type triode in first photoelectric coupled circuit D9 connects half-bridge driven
The driving pulse input terminal of integrated circuit, emitter meet Ucc-；The collector of NPN type triode in second photoelectric coupled circuit D10
Meet 12V+, emitter connects the base stage of triode V11.
Further, the half-bridge drive integrated circuit includes driving chip D8, diode V5, capacitance C22, high pressure mos
Pipe V6, high pressure mos pipes V9；The collector of NPN type triode in the first photoelectric coupled circuit D9 connects the excitation of driving chip D8
Pulse input end, the SD signal input parts of the driving chip D8 connect the collector and 12V of triode V11 simultaneously+, high-end output
The grid of terminated high voltage mos pipes V6, low side export the grid of terminated high voltage mos pipes V9, and feedback input end connects high pressure mos pipes simultaneously
The drain electrode of the source electrode, high pressure mos pipes V9 of V6, common ground terminate Ucc-, the ports VCC then meet 12V+, and connect via capacitance C21
Ucc-；The diode V5 anodes meet capacitance C21, and cathode connects the bootstrap voltage mode input terminal of driving chip D8, and two pole
Pipe V5 cathode also connect the feedback input end of driving chip D8 through capacitance C22；The drain electrode of the high pressure mos pipes V6 connects current detecting core
The electric current input pin of piece D5；The source electrode of the high pressure mos pipes V9 meets Ucc-。
Compared with prior art, the utility model has the advantages that：
(1) the utility model by design current detection chip, comparator, the first photoelectric coupled circuit, the second photoelectric coupled circuit and
The property of half-bridge drive integrated circuit, comparator output level depends on the current value size that current detecting chip flows through, and passes through
Microcontroller controls the first photoelectric coupled circuit, the conducting of the second photoelectric coupled circuit and off-state, to which drive control half-bridge driven is integrated
The high pressure mos pipes of circuit are turned on or off, and when overload or short trouble occur for system, the response time of protection is extremely short (about
10us), equipment is protected well, eliminates security risk.The normal work of fire alarm control system is not only ensured, and
And the advantages that minimum using high pressure mos pipe input currents, temperature stability energy is good, capability of resistance to radiation is strong, amplifying power is strong,
Driving chip, which need to only export smaller signal just, can drive high pressure mos to manage, and realize the amplification of signal, entire to greatly improved
The driving capability (can reach 10A or so) of system, is to kill two birds with one stone.
(2) current detecting chip is dexterously arranged according to Current Voltage situation of change when the system failure in the utility model, real
When acquisition system running current, and utilize comparator carry out curent change judgement.Pass through the IN in comparator D4-Hold shunt-wound capacitance
C16 carries out charge and discharge, on the one hand, as the input voltage of comparator, provides guarantee for the accurate response of high pressure mos pipes, avoids
Break down (such as overload or short circuit) when, comparator D4 exports high level signal to microcontroller, leads to the integrated electricity of half-bridge driven
Road is connected with current detecting chip；On the other hand, while ensureing to protect the response time, it can also prevent system power fluctuation from making
At high pressure mos pipes malfunction, keep protection act more acurrate.
(3) comparator of the utility model is connect with microcontroller external interrupt, only system jam when, microcontroller is just held
Row interrupt routine, the type for judging failure at this time provide foundation for later maintenance processing.Pass through the first optocoupler of drive control
Circuit, the second photoelectric coupled circuit on or off realize the quick self-protection response of system.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
The utility model is described in further detail with embodiment for explanation below in conjunction with the accompanying drawings, and the mode of the utility model includes
But it is not limited only to following embodiment.
Embodiment
As shown in Figure 1, the utility model provides a kind of over-current detection protection circuit, fire alarming and controlling system can be applied to
In system, mainly by microcontroller, current detecting chip D5, comparator D4, the first photoelectric coupled circuit D9, the second photoelectric coupled circuit D10 and
Half-bridge drive integrated circuit forms.
The current detecting chip D5 has electric current input pin (IP+ and IP-), power pins (VCC), analog voltage
Output pin (VIOUT), filtering pin (FILTER), wherein electric current input pin (IP+) meets Ucc+；Current detecting chip D5
Power pins and filtering pin meet VDD；Analog voltage output pin meets the IN of comparator D4-End, and in analog voltage
The IN of output pin and comparator D4-Capacitance C16 is connected between end, capacitance C16 accesses microcontroller by lead.
The IN of the comparator D4+End meets VDD through resistance R15, while being also grounded through resistance R16；Comparator D4 output ends
Then access the external interrupt of microcontroller.
The first photoelectric coupled circuit D9 and the second photoelectric coupled circuit D10 is examined for controlling half-bridge drive integrated circuit with electric current
Survey the connection or disconnection of chip D5.
Specifically, the first photoelectric coupled circuit D9 and the second photoelectric coupled circuit D10 include light emitting diode, one
A photodiode and a NPN type triode, wherein light emitting diode anode meets VDD, and cathode connects microcontroller；Photosensitive two pole
Pipe anode meets 12V+, cathode connects the base stage of NPN type triode；Emitter in first photoelectric coupled circuit D9 meets Ucc-；Second optocoupler electricity
The collector of NPN type triode in the D10 of road meets 12V+, emitter connects the base stage of triode V11.
The half-bridge drive integrated circuit then include driving chip D8, diode V5, capacitance C22, high pressure mos pipes V6,
V9.The collector of NPN type triode in the first photoelectric coupled circuit D9 connects the driving pulse input terminal of driving chip D8
(IN), the SD signal input parts of driving chip D8The collector and 12V of triode V11 are connect simultaneously+, high-end output end
(HO) grid (there are one drive resistance R26 for the two series connection) of high pressure mos pipes V6 is connect, low side output end (LO) connects high pressure mos pipes
The grid (there are one drive resistance R31 for the two series connection) of V9, feedback input end (VS) while source electrode, the height for meeting high pressure mos pipes V6
The drain electrode of pressure mos pipes V9 and microcontroller, common ground end (COM) meet Ucc-, the ports VCC then meet 12V+, and via capacitance C21
Meet Ucc-.The diode V5 anodes meet capacitance C21, and cathode connects the bootstrap voltage mode input terminal (VB) of driving chip D8, and
Diode V5 cathode also connect the feedback input end of driving chip D8 through capacitance C22；The drain electrode of the high pressure mos pipes V6 connects electric current
The electric current input pin (IP-) of detection chip D5；The source electrode of the high pressure mos pipes V9 meets Ucc-.Wherein, Ucc-And Ucc+For fire
Calamity controlling alarm system power supply, VDD are protection circuit internal power supply.
Self-protection after the increase of the utility model feasible system electric current and overcurrent, the specific implementation process is as follows：
When initial, microcontroller exports three poles in the first photoelectric coupled circuit D9, the first photoelectric coupled circuit D9 of high level signal driving
The emitter of pipe is connected with collector, to drive high pressure mos pipes V6 to be connected so that the electric power loop of fire alarm control system
It connects, and system drive ability can reach 10A or so, at the same time, microcontroller acquires the voltage signal at capacitance C16.
Current detecting chip D5 acquires current signal, and by the current signal transfer to capacitance C16, by comparator D4 into
Row IN+Terminal voltage and IN-Terminal voltage compares, the IN of comparator D4-Terminal voltage value size is by flowing through the electric current of current detecting chip D5
Value determines.If IN+Terminal voltage is more than IN-Terminal voltage then illustrates that system is normal operating condition, the high electricity of comparator output at this time
It is flat.
If IN+Terminal voltage is less than IN-Terminal voltage, then comparator D4 output levels overturning and as in the outside of microcontroller
Break signal, microcontroller receive the voltage signal at the places acquisition capacitance C16 after external interrupt signal, then by voltage signal progress AD
Conversion, the type for judging the system failure at this time.If the voltage value of AD conversion is more than preset value, which was
It carries；If the voltage value of AD conversion is less than preset value, which is short circuit.
While confirming the system failure, the second photoelectric coupled circuit of MCU driving D10 work, the collector of triode V11 with
Emitter is connected, at this point, the V6 cut-offs of high pressure mos pipes, to disconnect the electric power loop of fire alarm control system.
The utility model by rational circuit structure and flow scheme design, realize well system drive ability enhancing and
The self-protection after overcurrent occurs.For compared with prior art, the utility model has effectively achieved to system overload or short circuit
The purpose of detection and " high current-small voltage ", preferably meets the real work needs of fire alarm control system.Cause
This, the utility model is suitable for the large-scale promotion application in fire fire-fighting technical field.
Above-described embodiment is only one of preferred embodiments of the present invention, should not be taken to limit the utility model
Protection domain, as long as the utility model body design thought and that mentally makes have no the change of essential meaning or profit
Color, it is solved the technical issues of it is still consistent with the utility model, the scope of protection of the utility model should all be included in
Within.
Claims (3)
1. the over-current detection applied to fire alarm control system protects circuit, including microcontroller, which is characterized in that further include tool
There are electric current input pin, power pins, analog voltage output pin, the current detecting chip D5 and comparator for filtering pin
D4, the first photoelectric coupled circuit D9, the second photoelectric coupled circuit D10 and half-bridge drive integrated circuit；
The electric current input pin of the current detecting chip D5 meets Ucc+；The power pins and filtering pin of current detecting chip D5
Meet VDD；Analog voltage output pin meets the IN of comparator D4-End, and in analog voltage output pin with comparator D4's
IN-Capacitance C16 is connected between end, capacitance C16 accesses microcontroller by lead, and the electricity of capacitance C16 is acquired by microcontroller
Press signal；
The IN of the comparator D4+End meets VDD through resistance R15, while being also grounded through resistance R16；The access of comparator D4 output ends is single
The external interrupt of piece machine；
The first photoelectric coupled circuit D9 connects the pulse input end and microcontroller of half-bridge drive integrated circuit simultaneously, and meets 12V+With
VDD；
The second photoelectric coupled circuit D10 connects microcontroller, and the SD signals input of half-bridge drive integrated circuit is connect by triode V11
End, and meet 12V+And VDD；Triode V11 emitters meet Ucc-；
The half-bridge drive integrated circuit connects the electric current input pin of current detecting chip D5.
2. the over-current detection according to claim 1 applied to fire alarm control system protects circuit, which is characterized in that
The first photoelectric coupled circuit D9 and the second photoelectric coupled circuit D10 is including a light emitting diode, a photodiode and one
NPN type triode, wherein light emitting diode anode meets VDD, and cathode connects microcontroller；Photodiode anode meets 12V+, cathode connects
The base stage of NPN type triode；The collector of NPN type triode in first photoelectric coupled circuit D9 connects swashing for half-bridge drive integrated circuit
Pulse input end is encouraged, emitter meets Ucc-；The collector of NPN type triode in second photoelectric coupled circuit D10 meets 12V+, emitter
Connect the base stage of triode V11.
3. the over-current detection according to claim 2 applied to fire alarm control system protects circuit, which is characterized in that
The half-bridge drive integrated circuit includes driving chip D8, diode V5, capacitance C22, high pressure mos pipes V6, high pressure mos pipes V9；
The collector of NPN type triode in the first photoelectric coupled circuit D9 connects the driving pulse input terminal of driving chip D8, the drive
The SD signal input parts of dynamic chip D8 connect the collector and 12V of triode V11 simultaneously+, high-end output terminated high voltage mos pipes V6's
Grid, low side export the grid of terminated high voltage mos pipes V9, and feedback input end meets source electrode, the high pressure mos of high pressure mos pipes V6 simultaneously
The drain electrode of pipe V9, common ground terminate Ucc-, the ports VCC then meet 12V+, and meet Ucc via capacitance C21-；The diode V5
Anode meets capacitance C21, and cathode connects the bootstrap voltage mode input terminal of driving chip D8, and diode V5 cathode are also through capacitance C22
Connect the feedback input end of driving chip D8；The drain electrode of the high pressure mos pipes V6 connects the electric current input pin of current detecting chip D5；
The source electrode of the high pressure mos pipes V9 meets Ucc-。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721872773.4U CN207664592U (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721872773.4U CN207664592U (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207664592U true CN207664592U (en) | 2018-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721872773.4U Active CN207664592U (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947108A (en) * | 2017-12-27 | 2018-04-20 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
| CN109816915A (en) * | 2019-03-20 | 2019-05-28 | 武汉恒安数联电子科技有限公司 | A kind of fire acousto-optic alarm circuit |
-
2017
- 2017-12-27 CN CN201721872773.4U patent/CN207664592U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947108A (en) * | 2017-12-27 | 2018-04-20 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
| CN109816915A (en) * | 2019-03-20 | 2019-05-28 | 武汉恒安数联电子科技有限公司 | A kind of fire acousto-optic alarm circuit |
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