CN107947108A - Over-current detection applied to fire alarm control system protects circuit and implementation method - Google Patents
Over-current detection applied to fire alarm control system protects circuit and implementation method Download PDFInfo
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- CN107947108A CN107947108A CN201711445515.2A CN201711445515A CN107947108A CN 107947108 A CN107947108 A CN 107947108A CN 201711445515 A CN201711445515 A CN 201711445515A CN 107947108 A CN107947108 A CN 107947108A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
Abstract
The invention discloses a kind of over-current detection 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 for filtering pin, and comparator D4, the first photoelectric coupled circuit D9, the second photoelectric coupled circuit D10 and half-bridge drive integrated circuit.The present invention still further there is provided the implementation method of over-current detection protection circuit.The purpose of quick self-protection after the present invention realizes the enhancing of system drive ability and breaks down well.Therefore, the present invention is suitable for promoting and applying.
Description
Technical field
The present invention relates to technical field of fire control, and in particular to be that a kind of overcurrent applied to fire alarm control system is examined
Survey protection circuit and implementation method.
Background technology
Self-protection mode of the existing fire alarm control system circuit after overcurrent occurs, substantially by hardware
Realize, arranged for example with resettable fuse combination peripheral circuit.Existing this self-protection mode, major defect exist
In：
(1) driving force deficiency.Existing fire alarm control system, because of it, there is resettable fuse in circuit
(it is with certain resistance value), and without the function of realizing Current amplifier, so driving force 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 resettable fuse is a kind of the dynamic of energy
State balances, and flows through the electric current of resettable fuse because the relation of heating effect of current can produce a degree of heat, works as self- recoverage
When fuse is in low resistive state, resettable fuse is failure to actuate；When flowing through the electric current increase of resettable fuse element, from
Higher temperature can be reached by recovering fuse, and at this time, resettable fuse can be in high resistant guard mode, the increase limitation of impedance
Electric current so that electric current drastically declines within a very short time, so as to play the role of circuit arrangement protection.It is not difficult to find out, when being
When overcurrent occurs for system circuit, the disconnected resistance function of current is played in resettable fuse resistance needs the consuming regular hour (about to need 1~2
Second), so that, add the time that failure removal responds.
Therefore, it is necessary to the over-current detection and protection circuit of a kind of software and hardware combining are designed, to strengthen fire alarm control
While system drive ability processed, shorten the protection response time after overcurrent.
The content of the invention
For the deficiency of above-mentioned technology, the present invention provides a kind of over-current detection guarantor applied to fire alarm control system
Protection circuit and implementation method, can be while fire alarm control system driving force be strengthened, after shortening system generation overcurrent
Protect the response time.
To achieve the above object, the technical solution adopted by the present invention 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 for filtering pin, and comparator 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 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 gathered by microcontroller
Voltage signal；
The IN of the comparator D4+End meets VDD through resistance R15, while is also grounded through resistance R16；Comparator D4 output terminals
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 at the same time, 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 connection of NPN type triode, wherein, light emitting diode cathode meets VDD, and anode connects microcontroller；Photodiode cathode connects
12V+, anode 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 at the same time+, high-end output
The grid of terminated high voltage mos pipes V6, the grid of low side output terminated high voltage mos pipes V9, feedback input end connect high pressure mos pipes at the same time
The drain electrode of the source electrode, high pressure mos pipes V9 of V6, common ground termination Ucc-, VCC ports then meet 12V+, and connect via capacitance C21
Ucc-；The diode V5 cathodes meet capacitance C21, and anode connects the bootstrap voltage mode input terminal of driving chip D8, and two pole
Pipe V5 anode 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-。
Based on foregoing circuit, present invention also offers its implementation, comprises the following steps：
(1) the high-end output terminal of microcontroller output high level and connection the first photoelectric coupled circuit D9, driving chip D8 put high electricity
It is flat, the V6 conductings of driving high pressure mos pipes；
(2) current detecting chip D5 gathers current signal；
(3) comparator D4 compares IN+End and IN-The magnitude of voltage at end, works as IN+The magnitude of voltage at end is less than IN-The magnitude of voltage at end
When, the upset of comparator D4 output levels；
(4) microcontroller is according to the IN of comparator D4-The voltage signal at end, judges the type of the system failure at this time, and connects
Second photoelectric coupled circuit D10；
The collector of (5) second photoelectric coupled circuit D10 trigger triodes V11 is turned on emitter, and driving chip D8's is high-end
Output terminal sets low level, and high pressure mos pipes V6 cut-offs, realize overcurrent protection.
Compared with prior art, the invention has the advantages that：
(1) present invention passes through design current detection chip, comparator, the first photoelectric coupled circuit, the second photoelectric coupled circuit and half-bridge
Drive integrated circult, the property of comparator output level depend on the current value size that current detecting chip flows through, pass through monolithic
Machine controls the first photoelectric coupled circuit, the conducting of the second photoelectric coupled circuit and off-state, so that, drive control half-bridge drive integrated circuit
High pressure mos pipes be turned on or off, when overload occurs for system or during short trouble, the response time of protection is extremely short (about 10us),
Equipment is protected well, eliminates security risk.Consequently, it is possible to which the present invention is combined by the effective of software and hardware, not only ensure
The normal work of fire alarm control system, moreover, using high pressure mos pipe input currents are minimum, temperature stabilization performance is good,
The advantages that capability of resistance to radiation is strong, amplifying power is strong, driving chip, which need to only export less signal, just can drive high pressure mos to manage, real
The amplification of existing signal, is to kill two birds with one stone so that the driving force (can reach 10A or so) of whole system greatly improved.
(2) present invention dexterously sets current detecting chip according to Current Voltage situation of change during the system failure, adopts in real time
Collecting system running current, and carry out curent change judgement using comparator.Pass through the IN in comparator D4-Hold shunt-wound capacitance C16
Carry out discharge and recharge, on the one hand, as the input voltage of comparator, manage accurate response for high pressure mos and provide guarantee, avoid occurring
During failure (such as overload or short circuit), comparator D4 exports high level signal to microcontroller, cause half-bridge drive integrated circuit with
Current detecting chip turns on；On the other hand, while ensureing to protect the response time, caused by also preventing that system power fluctuates
High pressure mos pipes malfunction, and make protection act more accurate.
(3) comparator of the invention is connected with microcontroller external interrupt, only system jam when, during microcontroller just performs
Disconnected program, for judging the type of failure at this time, foundation is provided for later maintenance processing.Combination of the invention by software and hardware,
The first photoelectric coupled circuit of drive control, the second photoelectric coupled circuit on or off, realize the quick self-protection response of system.
(4) links of the present invention are all linked with one another, complement each other, it is by overall circuit structure design, with reference to software
Logic judgment, dexterously realize " high current-small voltage " (i.e.：High current is exported during non-overcurrent, when overload or short circuit occurs
Self-protection), so as to preferably meet the real work needs of fire alarm control system.
Brief description of the drawings
Fig. 1 is the circuit diagram of the present invention.
Embodiment
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the invention includes but not only limits
In following embodiments.
Embodiment
As shown in Figure 1, the present invention provides a kind of over-current detection to protect circuit, fire alarm control system can be applied to
In, it is 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 circult 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 is also grounded through resistance R16；Comparator D4 output terminals
Then access the external interrupt of microcontroller.
The first photoelectric coupled circuit D9 and the second photoelectric coupled circuit D10 is used to control half-bridge drive integrated circuit to examine 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 includes light emitting diode, one
A photodiode and a NPN type triode, wherein, light emitting diode cathode meets VDD, and anode connects microcontroller；Photosensitive two pole
Pipe cathode meets 12V+, anode 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 is connect at the same time+, high-end output terminal
(HO) grid (both are in series with a driving resistance R26) of high pressure mos pipes V6 is connect, low side output terminal (LO) connects high pressure mos pipes
The grid (both are in series with a driving resistance R31) of V9, feedback input end (VS) while source electrode, the height for meeting high pressure mos pipes V6
The drain electrode of mos pipes V9 is pressed, common ground end (COM) meets Ucc-, VCC ports then meet 12V+, and meet Ucc via capacitance C21-.It is described
Diode V5 cathodes meet capacitance C21, anode connects the bootstrap voltage mode input terminal (VB) of driving chip D8, and diode V5 is born
Pole also connects the feedback input end of driving chip D8 through capacitance C22；The drain electrode of the high pressure mos pipes V6 connects current detecting chip D5's
Electric current input pin (IP-)；The source electrode of the high pressure mos pipes V9 meets Ucc-.Wherein, Ucc-And Ucc+For fire alarming and controlling system
Power supply, VDD are protection circuit internal power supply.
Self-protection after feasible system electric current of the present invention increase and overcurrent, itself the specific implementation process is as follows：
When initial, microcontroller output high level signal drives three poles in the first photoelectric coupled circuit D9, the first photoelectric coupled circuit D9
The emitter of pipe is turned on collector, so as to drive high pressure mos pipes V6 to turn on so that the electric power loop of fire alarm control system
Connect, and system drive ability can reach 10A or so, at the same time, the voltage signal at microcontroller collection capacitance C16.
Current detecting chip D5 gathers current signal, and by the current signal transfer to capacitance C16, by comparator D4 into
Row IN+Terminal voltage and IN-Terminal voltage contrasts, 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 illustrate that system is normal operating condition at this time, comparator output is high electric
It is flat.
If IN+Terminal voltage is less than IN-Terminal voltage, then comparator D4 output levels overturn and be used as in the outside of microcontroller
Break signal, microcontroller receives the voltage signal that capacitance C16 place is gathered after external interrupt signal, then by voltage signal progress AD
Conversion, judges the type of the system failure at this time.If the magnitude of voltage of AD conversion is more than preset value, which is overload；If
The magnitude of voltage of AD conversion is less than preset value, then the system failure is short circuit.
While confirming the system failure, the second photoelectric coupled circuit of MCU driving D10 work, the current collection of trigger triode V11
Pole is turned on emitter, at this time, high pressure mos pipes V6 cut-offs, so as to disconnect the electric power loop of fire alarm control system.
The present invention is realized the enhancing of system drive ability and is occurred well by rational circuit structure and flow scheme design
Self-protection after overcurrent.For compared with prior art, the present invention have effectively achieved to system overload or short-circuit detecting and
The purpose of " high current-small voltage ", preferably meets the real work needs of fire alarm control system.Therefore, it is of the invention
Suitable for the large-scale promotion application in fire fire-fighting technical field.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention
Enclose, as long as the present invention body design thought and that mentally makes have no the change of essential meaning or polishing, it is solved
Technical problem it is still consistent with the present invention, should be included in protection scope of the present invention within.
Claims (4)
1. applied to the over-current detection protection circuit of fire alarm control system, including microcontroller, it is characterised in that further include tool
There are electric current input pin, power pins, analog voltage output pin, the current detecting chip D5 for filtering pin, and comparator
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 gathered by microcontroller
Press signal；
The IN of the comparator D4+End meets VDD through resistance R15, while is also grounded through resistance R16；The access of comparator D4 output terminals 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 at the same time, 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, it is characterised 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 cathode meets VDD, and anode connects microcontroller；Photodiode cathode meets 12V+, anode 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, it is characterised 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 at the same time+, high-end output terminated high voltage mos pipes V6's
Grid, the grid of low side output terminated high voltage mos pipes V9, feedback input end meet the source electrode of high pressure mos pipes V6, high pressure mos at the same time
The drain electrode of pipe V9, common ground termination Ucc-, VCC ports then meet 12V+, and meet Ucc via capacitance C21-；The diode V5
Cathode meets capacitance C21, and anode connects the bootstrap voltage mode input terminal of driving chip D8, and diode V5 anode 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-。
4. the implementation method of the over-current detection protection circuit applied to fire alarm control system, it is characterised in that including following
Step：
(1) microcontroller exports high level and connects the first photoelectric coupled circuit D9, and the high-end output terminal of driving chip D8 puts high level, drives
Dynamic high pressure mos pipes V6 conductings；
(2) current detecting chip D5 gathers current signal；
(3) comparator D4 compares IN+End and IN-The magnitude of voltage at end, works as IN+The magnitude of voltage at end is less than IN-During the magnitude of voltage at end, compare
Device D4 output levels are overturn；
(4) microcontroller is according to the IN of comparator D4-The voltage signal at end, judges the type of the system failure at this time, and connects the second light
Coupling circuit D10；
The collector of (5) second photoelectric coupled circuit D10 trigger triodes V11 is turned on emitter, the high-end output of driving chip D8
End sets low level, and high pressure mos pipes V6 cut-offs, realize overcurrent protection.
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