CN109188063A - A kind of sensor self-adaptation type composite electric fire hazard monitoring detector - Google Patents
A kind of sensor self-adaptation type composite electric fire hazard monitoring detector Download PDFInfo
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- CN109188063A CN109188063A CN201811119126.5A CN201811119126A CN109188063A CN 109188063 A CN109188063 A CN 109188063A CN 201811119126 A CN201811119126 A CN 201811119126A CN 109188063 A CN109188063 A CN 109188063A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
Abstract
" a kind of sensor self-adaptation type composite electric fire hazard monitoring detector ", including sensor self-identifying unit, sensor sample amplifies filter unit, power circuit unit, voltage zero-crossing signal sample processing unit, sensor refers to pressure stabilizing reference cell, CAN communication and protection location, sound-light alarm driving unit and MCU microprocessor, the detector can be with the open circuit of the type of automatic identification sensor and sensor connecting line, short-circuit condition, the amplifying circuit of different gains is set for the residual current transformer formula sensor or temp.-measuring type sensor after self-identifying, it is provided with Second-Order Active Filters simultaneously, pressure stabilizing reference circuit and voltage zero-crossing signal processing technique are referred to using sensor, Signal Isolation Technology, CAN communication bus alarm signal active upload technology and high performance MCU microprocessor, it is combined with Software algorithm is closed, measurement accuracy and the anti-electromagnetism for substantially increasing detector are dry around ability, shorten alarm signal uplink time, reduce the wrong report of detector, improve the job stability of detector.
Description
Technical field
The present invention relates to a kind of detector for electric fire protection, in particular relate to a kind of sensor self-adaptation type Combined type electric
Gas fire monitoring detector.
Background technique
In recent years, China's electrical fire is constantly in high-incidence multiple situation, according to the statistics made by the departments concerned, 2011 to 2016
Year, China occurs electrical fire 52.4 ten thousand altogether, account for 30% or more of national fire total amount, the prevention and treatment of electrical fire have gone up for
National strategy is particularly important the quality requirement of electrical fire-detector.
Detector for electric fire protection is China's electric fire disaster warning leading products that emphasis is promoted at this stage, and main includes residue
Current monitoring detection alarm and monitoring temperature detection alarm two major classes.Although electrical fire-detector obtains in use at the scene
Be widely applied, but be still in the junior stage at present, product quality problem is more: first is that detector to acquisition signal measurement not
Standard, error is larger, while electromagnetic compatibility immunity performance is insufficient, therefore causes largely to report by mistake.The measurement method of residual current at present
Period peak-peak and rectified mean value detection method are mostly used, the method is only applicable to the application of pure sine wave, does not examine
Consider the influence of load harmonic current generation.Residual current transformer equilibrium response and impact characteristics it is bad and generation wrong report
Sizable ratio is also accounted for the wrong report etc. that capacitive load normal leakage electric current generates.Second is that detector design safety factor (DSF) is low:
Detector for electric fire protection is generally located in low-voltage distribution cabinet, and what is monitored under normal conditions is that the low pressure of 220V or 380V is matched
Electrical circuit, temp.-measuring type detector is mostly used for temperature at monitoring connecting terminal, if the power supply power supply part of detector and thermometric
Sensor section is without being effectively isolated the safety for sealing in the risk of detector it is easy to appear high pressure and influencing whole system
Operation, while communication and not being isolated for power unit can also generate the above problem.Third is that detector intelligence degree is low: due to electricity
Gas fire monitoring detector is generally mounted in power distribution cabinet, while monitoring the residual current and cable temperature of distribution line, therefore
Most of power distribution cabinet needs to configure two distinct types of product simultaneously and is just able to satisfy detection requirement, and this aspect will be such that system becomes
Complicated, failure rate increase is obtained, while also making cost increase.
Summary of the invention
The purpose of the present invention is to provide a kind of Electro Magnetic Compatibility is preferable, measurement accuracy, security performance and intelligent journey
A kind of higher sensor self-adaptation type composite electric fire hazard monitoring detector is spent, for this purpose, the present invention uses following technical side
Case:
A kind of sensor self-adaptation type composite electric fire hazard monitoring detector, including sensor self-identifying unit, sensor are adopted
Sample amplification filter unit, power conversion unit, voltage zero-crossing signal sample processing unit, sensor refer to pressure stabilizing reference cell,
CAN communication and protection location, sound-light alarm driving unit and MCU microprocessor；
Further setting, the sensor self-identifying unit include that sensor open circuit, short-circuit recognition unit and sensor type are known
Other unit；
The sensor open circuit, short-circuit recognition unit include sensor signal input terminal P1, sensor with reference to pressure stabilizing benchmark list
Member, field-effect tube Q1, operational amplifier U2 and MCU microprocessor, the collected signal of sensor is through terminals P 1 and voltage-stabiliser tube
A termination sensor of TVS1, the both ends resistance R5 parallel output, R5 obtain stable DC reference with reference to pressure stabilizing reference cell
Reference voltage, this is conducive to the accurate measurement of signal, and the other end of R5 connects the homophase input of operational amplifier U2 by resistance R8
End amplifies input signal by the operational amplifier U2 and carries out digital-to-analogue through the MCU microprocessor after filtering
Conversion, while 3 pulse square wave signals that the port the I/O output period of MCU microprocessor is 40mS control field-effect tube Q1's
On-off, MCU microprocessor acquires data when being Q1 opening state between the high period of each pulse signal, then to acquisition
To data be analyzed and processed and judge the circuit break and short circuit failure for whether having sensor connecting line, if Q1 is opening shape
Under state, the average value of the sum of all sample point datas is less than given decision threshold and continuous three periods in half of sampling period
Decision condition is effective, can be judged as sensor connecting line open circuit, if Q1 is in the on state, institute in half of sampling period
There is the average value of the sum of sample point data effective greater than given decision threshold and continuous three period decision conditions, then may be used
Judge sensor for short circuit.
Further setting, the type identification unit of the sensor includes sensor signal input terminal P1, field-effect tube
Q1, amplifier filter unit and MCU microprocessor, after the MCU microprocessor completes the initialization to each peripheral hardware, by
3 pulse square wave signal driving FET Q1's that its PTC5 foot output period is 20mS is switched on or off, in this 3 pulses
The voltage value of MCU meeting timing acquiring and processing through the filtered sensor input signal V2 of amplification during square-wave signal generates,
If electrical fire-detector mating is residual current transformer formula sensor, V2 value can be high electricity in the control signal
On a declining curve according to the flash-over characteristic of inductance during flat, in the control signal, V2 value can be because of inductance between low period
The trend risen is presented in characteristic voltage at the bigoted point of direct current, if the sensor being coupled is temp.-measuring type sensor, is surveying
It measures V2 value in the period and is presented stable output state, the MCU microprocessor type of automatic identification sensor accordingly.
Further setting, the amplifier filter unit are provided with operational amplifier U2B and operational amplifier U2A,
Residual current transformer formula sensor or the amplification of temp.-measuring type sensor input signal are adjusted separately by the MCU microprocessor
The different gains of circuit U 2B, if self-identifying is temp.-measuring type sensor, the MCU microprocessor of detector be can according to need certainly
Dynamic to obtain its gain tune higher, if what is detected is mutual-inductor type sensor, the MCU microprocessor of detector is automatically by it
Gain tune obtains lower, in this way, not only can detecte the maximum output signal of sensor, but also the waveform of output signal is lost
Really spend detection accuracy that is small, thus improving signal.
Further setting, the amplifier filter unit further includes Second-Order Active Filters, the second order active
Filter includes operational amplifier U2A, resistance R9, R10, capacitor C2, C6, C7, and the Second-Order Active Filters export connecting resistance
R11, and it is connected to by R11, three terminal capacitor V1 the ADC sampling end of MCU microprocessor, the Second-Order Active Filters can subtract
The influence that few 11 times or more higher hamonic waves generate measurement error makes detector can be very good to adapt to have the load of frequency conversion class
Or the application of frequency conversion class power supply.
Further setting, the sensor with reference to pressure stabilizing reference cell include resistance R19, by capacitor C23, C24,
The filter circuit of C25, C26, inductance L2, L3 composition, by being operational amplifier U1B and U1A and described after U1 pressure stabilizing
MCU microprocessor provides stable reference voltage, to improve the measurement accuracy to signal.
Further setting, the voltage zero-crossing signal sample processing unit includes connecting terminal P2 and power transformer T1
, the armature winding of the power transformer T1 connects with the input of optocoupler U6, and the output of optocoupler U6 is connected to voltage zero-cross letter
The input terminal of number sample processing unit,By comparator U1, resistance R1, R2, R3, R4 and capacitor C1 are realized to input voltage mistake
The MCU microprocessor is output to after the shaping amplification of zero-signal and the Hysteresis control of signal, the MCU microprocessor passes through
The periodic signal of supply voltage controls the sampling period signal of digital-to-analogue conversion ADC, so that the virtual value for reaching sampled signal is surveyed
The period purpose synchronous with mains voltage cycle is measured, the measurement accuracy to signal is further improved.
Further setting, the power circuit includes power supply connecting terminal P2, isolating transformer T1 and filtered electrical
Road, the power supply are connected to the primary of isolating transformer T1, and the secondary of T1 is connected to rectifier bridge U5 and then passes through filtering
After capacitor C21, three end filter CL1, filter capacitor C19, C20 filtering, enter three terminal regulator U4 all the way, by three terminal regulator
U4 output gives detector each functional unit power supply respectively after filter element L1, C16, C17, C18 are filtered again, another way
It is connected to the ADC reference data voltage regulator circuit of MCU by VDD, provides reference data regulated power supply for MCU；
The communication and protection location includes electromagnetic isolation device U9, and regulated power supply is isolated in CAN communication driver U10, DC/DC
U8, common mode inductance LH1, surge suppression device TVS3, TVS4, TVS5, fast quick-recovery insure PTC1, PTC2, filter capacitor C27
~C36, the electromagnetic isolation device U9 realize the isolation of communication signal, and the isolation regulated power supply U8 realizes telecommunication circuit and supplies
Isolation between power supply,.
Further setting, the MCU microprocessor use 32 MKE06Z64 microprocessors of ARM of NXP company, institute
The MKE06Z64 microprocessor stated have good EMC Electro Magnetic Compatibility, wider Acclimation temperature range, high-precision ADC,
Various excellent properties such as integrated CAN controller, the meter in such a way that the platform uses effective value measurement in the present invention
Residual current value is calculated, i.e., completes the data sampling of 64 sampled points in the 20mS of each measurement period, data conversion, each adopt
The operations such as sampling point data are squared, the summation of all sampled point square values, extraction of square root, relative to flat by peak meter algorithm and rectification
The calculation method of mean value obtains the residual-current electrical fire detector of residual current, and the present invention can more accurately measure electricity
Residual current value in road comprising 11 times and harmonic component below, it is possible to reduce because harmonic current influences the measurement error generated
So as to cause false alarm.Current general detector is all made of period peak-peak due to being influenced by CPU operational capability
And the detection method of rectified mean value checks and calculates residual current value, but such method can be because of the influence of load current harmonic wave
And biggish measurement error is generated, and generate false alarm, the serious performance for reducing product.
Further setting, the MKE06Z64 microprocessor, by the CAN controller built in it, using total based on CAN
The communication mode and real-time software Processing Algorithm of line, the warning message that any detector occurs in system can be immediately on host
It passes, alarm time can foreshorten to second grade, strive for valuable time for paroxysmal fire incident.
It is had the beneficial effect that with invention
Since this sensor self-adaptation type composite electric fire hazard monitoring detector has sensor type identification and sensor
The intelligent functions of connecting line open circuit, short circuit identification, simplify the structure of electrical fire-detector, improve electrical fire detection
The job stability of device can be accomplished to be directed to residual current transformer formula also just because of the type of automatic identification sensor
The different characteristics of sensor and temp.-measuring type sensor are provided with the amplifier of different gains in detector, both can detecte biography
The spiking output of sensor, while making the waveform distortion of output signal small again, thus improve the inspection of sensor signal
Survey precision.Due to using high performance MCU microprocessor, the anti-electromagnetism for improving detector is dry around ability, can be using more
Accurate effective value measurement mode calculates 11 times and the residual current value of harmonic component below, filters due to being provided with second order active
Wave device keeps detector better so that the residual current value of 11 times or more harmonic components can be measured accurately
The application with the load of frequency conversion class or frequency conversion class power supply is adapted to, the measurement accuracy of detector is improved, due in sensor
Amplifying circuit and MCU microprocessor power supply circuit in use refer to pressure stabilizing reference circuit, used in sampled signal
Voltage zero-crossing signal processing technique, these measures improve detector to the measurement accuracy of acquisition signal, due to using electricity
Source signal isolation technology and signal of communication isolation technology, improve the safe running performance of detector, are based on CAN due to using
The active upload immediately of warning message may be implemented in the communication mode of fieldbus.Due to detector measuring accuracy and safety
The raising of energy, reduces the false alarm of detector, improves the job stability of detector.
Detailed description of the invention
Fig. 1 is detector entirety realization principle block diagram of the present invention；
Fig. 2 is that Fig. 1 sensor sample amplifies filter unit schematic circuit；
Fig. 3 is Fig. 1 sensor type and open circuit, short-circuit recognition unit main body line map；
Fig. 4 is Fig. 1 power circuit unit schematic circuit；
Fig. 5 is that Fig. 1 refers to pressure stabilizing reference cell main body line map；
Fig. 6 is Fig. 1 CAN communication and protection location schematic circuit；
Fig. 7 is Fig. 1 MCU microprocessor main body line map；
Fig. 8 is Fig. 1 voltage zero-crossing signal sample processing unit main body line map；
Fig. 9 is the waveform diagram of automatic identification residual current formula sensor and temp.-measuring type sensor；
Figure 10 is the open circuit of detector external sensor line, short-circuit recognition subroutine flow chart；
Figure 11 is detector automatic identification residual current transformer formula sensor and temp.-measuring type sensor subroutine flow chart.
Specific embodiment
In conjunction with Fig. 1~Figure 11, by specific embodiment, the invention will be further described.
A kind of sensor self-adaptation type composite electric fire hazard monitoring detector, as shown in Figure 1, including sensor self-identifying
Unit, sensor sample amplify filter unit, power circuit unit, voltage zero-crossing signal sample processing unit, sensor reference
Pressure stabilizing reference cell, CAN communication and protection location, sound-light alarm driving unit and MCU microprocessor；
Further setting, the sensor self-identifying unit include the open circuit of sensor connecting line, short-circuit recognition unit and sensor
Type identification unit；
The main body route of breaking, the short-circuit recognition unit of the sensor connecting line is as shown in figure 3, include sensor signal input terminal
Sub- P1, field-effect tube Q1 further include the sensor of the amplifier filter unit of Fig. 2, Fig. 5 with reference to pressure stabilizing reference cell and Fig. 7
MCU microprocessor, the collected signal of sensor through terminals P 1 and voltage-stabiliser tube TVS1, the both ends resistance R5 parallel output, R5's
Vref map interlinking 5 sensor in one end refers to the Vref of pressure stabilizing reference cell and obtains stable DC reference reference voltage, this is advantageous
In the accurate measurement of signal, the other end of R5 passes through the non-inverting input terminal of the operational amplifier U2B of resistance R8 map interlinking 2, passes through institute
The MCU microprocessor through Fig. 7 carries out digital-to-analogue conversion after the operational amplifier U2B and U2A stated amplifies filtering processing to signal,
The on-off for 3 pulse square wave signal control figures, the 3 field-effect tube Q1 that the MCU microprocessor output period is 40mS simultaneously, MCU are micro-
Processor acquires data when being Q1 opening state between the high period of each pulse signal, and external according to the detector of Figure 10
The open circuit of sensor connecting line, short-circuit recognition subroutine flow chart are analyzed and processed collected data and judge whether have
The circuit break and short circuit failure of sensor connecting line, if Q1 is in the on state, all sample point datas in half of sampling period
The sum of average value be less than given decision threshold and continuous three period decision conditions are effective, can be judged as that sensor connects
Wiring open circuit, if Q1 is in the on state, in half of sampling period the sum of all sample point datas it is average be greater than it is given
Decision threshold and continuous three period decision conditions are effective then can determine whether sensor connecting line for short circuit.
Further setting, the main body route of the type identification unit of the sensor is as shown in figure 3, include sensor signal
It input terminal P1, field-effect tube Q1, further include the amplifier filter unit of Fig. 2 and the MCU microprocessor of Fig. 7, when the micro- place MCU
After device completion is managed to the initialization of each peripheral hardware, the field Fig. 3 is driven by 3 pulse square wave signals that its PTC5 foot output period is 20mS
Effect pipe Q1's is switched on or off, and MCU microprocessor is understood timing acquiring and handled during this 3 pulse square wave signals generate
Amplify the voltage value of filtered sensor input signal V2 through Fig. 2, and according to Figure 11 detector automatic identification residual current formula
Sensor and temp.-measuring type sensor subroutine flow chart carry out the type of identification sensor, if electrical fire-detector mating is
Residual current transformer formula sensor, the controlling of sampling timing based on V2 is as shown in the T2 of Fig. 9, the output control sequential based on Q1
As shown in the T1 of Fig. 9, in the case where the voltage value of output V2 between high period of control signal Q1 is according to the flash-over characteristic of inductance
Drop trend, in control signal, V2 voltage value can be because of characteristic voltage presentation rising at the bigoted point of direct current of inductance between low period
Trend, if the sensor being coupled is temperature transducer, stable output state is presented in V2 value in measurement period,
The MCU microprocessor type of automatic identification sensor accordingly.
Further setting, as shown in Fig. 2, the sensor sample amplification filter unit is provided with operational amplifier U2B
With operational amplifier U2A, high relative to residual current transformer formula sensor output signal Voltage, waveform distortion is larger, this
Lower gain amplifier need to set, temp.-measuring type sensor output signal Voltage is low, and waveform distortion is smaller, can be set compared with
High gain amplifier needs the gain amplifier point to dissimilar sensor input signal to meet the needs of measurement accuracy
It is not adjusted, the MCU microprocessor is after completing sensor type identification, by MCU microprocessor to field-effect tube
The adjust automatically to operational amplifier U2B gain amplifier is realized in the control of Q2, is believed to realize to input dissimilar sensor
Number gain amplifier it is adaptive, and general electrical fire-detector needs two distinct types of detector and different gains
Amplifying circuit can just obtain such measurement effect.
In the present invention, after detector detects different types of sensor, detector is provided with two different gains
Adjustment circuit, detector can adjust separately not in two gain adjustment circuits according to the different technologies feature of sensor
Same lean.When detector detects that sensor be coupled is residual current transformer formula sensor, Q2 remains pass
The gain amplifier of disconnected off state, operational amplifier U2B is only determined by resistance R15, R13, C8, C9 jointly, because Q2 is off
Its influence to gain can be ignored when cut-off, when the sensor that detector is coupled is temp.-measuring type sensor, need
Control Q2 is on state, and the gain amplifier of operational amplifier U2B is jointly true by the value of R15, R13, R16, C8, C9 at this time
It is fixed, therefore temp.-measuring type sensor can be met to gain amplifier by the ratio end parallel resistance R16 to operational amplifier U2B
Demand.Therefore, if what detector detected is temp.-measuring type sensor, detector be can according to need its gain tune automatically
It is higher, if what detector detected is residual current transformer formula sensor, detector automatically by its gain tune compared with
It is low, in this way, not only can detecte the maximum output signal of sensor, but also make the waveform distortion of output signal small, because
And improve the detection accuracy of signal.
Further setting, as shown in Fig. 2, the sensor sample amplification filter unit further includes second-order active filter
Device, the Second-Order Active Filters include operational amplifier U2A, resistance R9, R10, capacitor C2, C6, C7, the second order active
Filter exports connecting resistance R11, and the ADC sampling end of MCU microprocessor is connected to by R11, three terminal capacitor V1, and described two
Rank active filter can reduce the influence that 11 times or more higher hamonic waves generate measurement error, and detector is made to can be very good to fit
There should be the application of the load of frequency conversion class or frequency conversion class power supply.
Further setting, as shown in figure 5, the sensor includes resistance R19 with reference to pressure stabilizing reference cell, by capacitor
C23, C24, C25, C26 and inductance L2, L3 composition filter circuit, by after U7 pressure stabilizing be operational amplifier U1B, U1A and
The MCU microprocessor provides stable reference data voltage, to improve the measurement accuracy to signal.
Further setting, as shown in figure 4, the voltage zero-crossing signal sample processing unit includes connecting terminal P2 and electricity
The armature winding of source transformer T1, the power transformer T1 are connected with the input of optocoupler U6, and the output of optocoupler U6 passes through
R18 is connected to input terminal VCC, GND of Fig. 8 voltage zero-crossing signal sample processing unit,By comparator U1, resistance R1, R2,
R3, R4 and capacitor C1 are realized described to being output to after the shaping amplification of input voltage zero cross signal and the Hysteresis control of signal
The external interrupt pin PTD0 of MCU microprocessor, the MCU microprocessor control digital-to-analogue by the periodic signal of supply voltage
The sampling period signal for converting ADC, thus the mesh that the effective value measurement period for reaching sampled signal is synchronous with mains voltage cycle
, further improve the measurement accuracy to signal.
Further setting, as shown in figure 4, the power circuit includes power supply connecting terminal P2, isolating transformer
T1 and filter circuit, the power supply are connected to the primary of isolating transformer T1, and it is right that the secondary of T1 is connected to rectifier bridge U5
After filtering afterwards by filter capacitor C19, C20, C21, three end filter CL1, enter three terminal regulator U4 all the way, by three-terminal voltage-stabilizing
Device U4 output gives detector each functional unit power supply respectively after filter element L1, C16, C17, C18 are filtered again, another
Road is connected to the end ADC reference data pressure stabilizing pin VREFH of MCU microprocessor by VDD, provides reference for MCU microprocessor
Reference pressure stabilization power.
Further setting, as shown in fig. 6, the CAN communication and protection location includes electromagnetic isolation device U9, CAN communication
Driver U10, regulated power supply U8, common mode inductance LH1, surge suppression device TVS3, TVS4, TVS5 is isolated in DC/DC, quickly extensive
Double insurance PTC1, PTC2, filter capacitor C27~C36, the electromagnetic isolation device U9 realize the isolation of communication signal, the isolation
Regulated power supply U8 realizes being isolated between telecommunication circuit and power supply,.
Further setting, as shown in Figure 1, the MCU microprocessor is micro- using 32 MKE06Z64 of ARM of NXP company
Processor, the MKE06Z64 microprocessor have good EMC Electro Magnetic Compatibility, and wider Acclimation temperature range is high
The ADC of precision is internally integrated various excellent properties such as CAN controller, in the present invention using the MCU microprocessor
Residual current value is calculated using effective value measurement mode, i.e., completes the data of 64 sampled points in the 20mS of each measurement period
The operations such as sampling, data conversion, each sample point data be squared, all sampled point square value summations, extraction of square root, relative to logical
Cross the residual-current electrical fire detector of the calculation method acquisition residual current of peak meter algorithm and rectified mean value, this hair
Bright residual current value that can more accurately in measuring circuit comprising 11 times and harmonic component below, it is possible to reduce because of harmonic wave electricity
Stream influence generate measurement error so as to cause false alarm；
Further setting, the MKE06Z64 microprocessor, by the CAN controller built in it, use is CAN bus based
Communication mode and bus architecture without principal and subordinate cooperate real-time software Processing Algorithm, the alarm signal that any detector occurs in system
Breath can realize and upload immediately to host that alarm time can foreshorten to second grade, strive for for paroxysmal fire incident
Valuable time.Under normal conditions the alarm time of alarm system depend primarily on detector measurement determine the time and
Warning message uplink time, the latter are the principal elements of alarm time, and current most similar product is all made of RS485
Bus and fire-fighting private communication bus, and both communication modes can only report alarm signal under the detector patrol mode of poll
Breath, alarm time are influenced, are typically necessary by traffic rate, the quantity of sensing point be coupled, poll-interval etc.
Tens seconds time.
It should be understood that the above embodiment is merely an example for clearly illustrating the present invention, and not to reality
The restriction of mode is applied, for those of ordinary skill in the art, can also be made on the basis of the above description other
Various forms of variations or variation, there is no necessity and possibility to exhaust all the enbodiments, and extended from this
Obvious changes or variations are still in the protection scope of this invention.
Claims (7)
1. a kind of sensor self-adaptation type composite electric fire hazard monitoring detector, including sensor self-identifying unit, sensor
Amplifier filter unit, power circuit unit, voltage zero-crossing signal sample processing unit, sensor refer to pressure stabilizing benchmark list
Member, CAN communication and protection location, sound-light alarm driving unit and MCU microprocessor；
It is characterized in that: the sensor self-identifying unit includes open circuit, short-circuit recognition unit and the sensor of sensor connecting line
Type identification unit；
The open circuit of the sensor connecting line, short-circuit recognition unit include sensor signal input terminal P1, sensor reference
Pressure stabilizing reference cell, field-effect tube Q1, operational amplifier U2 and MCU microprocessor, the collected signal of sensor is through terminals P 1
With voltage-stabiliser tube TVS1, the both ends resistance R5 parallel output, the sensor that a termination of R5 is described is obtained with reference to pressure stabilizing reference cell
The other end of stable DC reference reference voltage, R5 meets operational amplifier U2 by resistance R8, passes through the operation amplifier
Device U2 through the MCU microprocessor carries out digital-to-analogue conversion, while the micro- place MCU after amplifying, being filtered to input signal
Managing the device output period is that 3 pulse square wave signals of 40mS control the on-off of field-effect tube Q1, and MCU microprocessor is in each arteries and veins
Rush the high period of signal i.e. Q1 opening state when acquire data, then collected data are analyzed and processed and are sentenced automatically
It is disconnected to have the circuit break and short circuit failure for whether having sensor connecting line；
The type identification unit of the sensor includes sensor signal input terminal P1, field-effect tube Q1, amplifier filtering
Unit and MCU microprocessor export week by its PTC5 foot after the MCU microprocessor completes the initialization to each peripheral hardware
Phase is being switched on or off for 3 pulse square wave signal driving FET Q1 of 20mS, generates the phase in this 3 pulse square wave signals
Interior MCU microprocessor meeting timing acquiring simultaneously handles the voltage value through amplifying filtered sensor input signal V2, and according to
Residual current transformer formula sensor or the V2 voltage value of temp.-measuring type sensor different technologies feature and determine sensor automatically
Type.
2. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, it is characterized in that: described
Sensor sample amplification filter unit be provided with operational amplifier U2B and operational amplifier U2A, pass through the micro- place MCU
Reason device adjusts separately residual current transformer formula sensor or the different of temp.-measuring type sensor input signal amplifying circuit U2B increase
Benefit；
The sensor sample amplification filter unit further includes Second-Order Active Filters, and the Second-Order Active Filters include
Operational amplifier U2A, resistance R9, R10, capacitor C2, C6, C7, the Second-Order Active Filters export connecting resistance R11, and pass through
R11, three terminal capacitor V1 are connected to the ADC sampling end of MCU microprocessor.
3. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, characterized in that described
Sensor with reference to pressure stabilizing reference cell include resistance R1, the filtered electrical that is made of capacitor C1, C2, C3, C4, inductance L1, L2
Road, by providing stable reference data electricity after U1 pressure stabilizing for operational amplifier U1B, U1A and the MCU microprocessor
Pressure.
4. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, it is characterized in that: described
Voltage zero-crossing signal sample processing unit include connecting terminal P2 and power transformer T1, the power transformer T1's
Armature winding is connected with the input of optocoupler U6, and the output of optocoupler U6 is connected to voltage zero-crossing signal sample processing unit by R18
Input terminal,By comparator U1, the shaping of input voltage zero cross signal is put in resistance R1, R2, R3, R4 and capacitor C1, realization
The MCU microprocessor, the period that the MCU microprocessor passes through supply voltage are output to after the big and Hysteresis control of signal
Signal controls the sampling period signal of digital-to-analogue conversion ADC, to reach effective value measurement period and the power supply electricity of sampled signal
Press the purpose of cycle synchronisation.
5. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, it is characterized in that: described
Power circuit include power supply connecting terminal P2, isolating transformer T1 and filter circuit, the power supply be connected to every
Primary from transformer T1, the secondary of T1 be connected to rectifier bridge U5 then pass through filter capacitor C21, three end filter CL1,
Filter capacitor C19, C20 filtering after, all the way enter three terminal regulator U4, by three terminal regulator U4 output through filter element L1,
C16, C17, C18 give detector each functional unit power supply respectively after filtering again, and another way is connected to the micro- place MCU by VDD
The ADC reference data voltage regulator circuit for managing device, provides reference data regulated power supply for MCU microprocessor.
6. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, it is characterized in that: described
Communication and protection location include electromagnetic isolation device U9, regulated power supply U8, common mode is isolated in CAN communication driver U10, DC/DC
Inductance LH1, surge suppressor TVS3, TVS4, TVS5, fast quick-recovery insure PTC1, PTC2, filter capacitor C27~C36, described
Electromagnetic isolation device U9 realizes the isolation of communication signal, and the isolation regulated power supply U8 is realized between telecommunication circuit and power supply
Isolation.
7. sensor self-adaptation type composite electric fire hazard monitoring detector according to claim 1, it is characterized in that: described
MCU microprocessor use 32 MKE06Z64 microprocessors of ARM of NXP company, the MKE06Z64 microprocessor passes through it
Built-in CAN controller realizes warning message using CAN bus based communication mode and real-time software Processing Algorithm
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| CN110264659A (en) * | 2019-05-22 | 2019-09-20 | 应急管理部沈阳消防研究所 | A kind of compound detector for electric fire protection and its monitoring method |
| CN110618238A (en) * | 2019-09-29 | 2019-12-27 | 欧勒姆电气(珠海)有限公司 | Self-adaptive driving circuit of gas sensor |
| CN110660188A (en) * | 2019-09-30 | 2020-01-07 | 四川赛科安全技术有限公司 | Temperature and residual current mixed detection and identification method for electrical fire detector |
| CN110969797A (en) * | 2019-11-14 | 2020-04-07 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fire alarm monitoring method and circuit |
| CN111053989A (en) * | 2020-01-09 | 2020-04-24 | 贵州权盛嘉智能科技有限公司 | Intelligent fire-fighting electrical system |
| CN112150751A (en) * | 2020-08-27 | 2020-12-29 | 福建信通慧安科技有限公司 | Fire detector, gateway and fire early warning system |
| CN113405593A (en) * | 2021-05-19 | 2021-09-17 | 蚌埠依爱消防电子有限责任公司 | Time-sharing multiplexing and self-adapting method for temperature and leakage current detection channels |
| CN113447616A (en) * | 2021-06-22 | 2021-09-28 | 成都归谷环境科技有限责任公司 | PWM output value calculation method of CO2 sensor |
| CN114062772A (en) * | 2020-08-07 | 2022-02-18 | 天津首瑞智能电气有限公司 | Residual current measuring circuit |
| CN114383657A (en) * | 2021-12-30 | 2022-04-22 | 成都天地直方发动机有限公司 | Multifunctional mining sensor detection system |
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| CN110264659A (en) * | 2019-05-22 | 2019-09-20 | 应急管理部沈阳消防研究所 | A kind of compound detector for electric fire protection and its monitoring method |
| CN110264659B (en) * | 2019-05-22 | 2024-03-01 | 应急管理部沈阳消防研究所 | Composite electric fire monitoring detector and monitoring method thereof |
| CN110618238A (en) * | 2019-09-29 | 2019-12-27 | 欧勒姆电气(珠海)有限公司 | Self-adaptive driving circuit of gas sensor |
| CN110660188B (en) * | 2019-09-30 | 2021-07-23 | 四川赛科安全技术有限公司 | Temperature and residual current mixed detection and identification method for electrical fire detector |
| CN110660188A (en) * | 2019-09-30 | 2020-01-07 | 四川赛科安全技术有限公司 | Temperature and residual current mixed detection and identification method for electrical fire detector |
| CN110969797A (en) * | 2019-11-14 | 2020-04-07 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fire alarm monitoring method and circuit |
| CN111053989A (en) * | 2020-01-09 | 2020-04-24 | 贵州权盛嘉智能科技有限公司 | Intelligent fire-fighting electrical system |
| CN114062772A (en) * | 2020-08-07 | 2022-02-18 | 天津首瑞智能电气有限公司 | Residual current measuring circuit |
| CN112150751A (en) * | 2020-08-27 | 2020-12-29 | 福建信通慧安科技有限公司 | Fire detector, gateway and fire early warning system |
| CN113405593A (en) * | 2021-05-19 | 2021-09-17 | 蚌埠依爱消防电子有限责任公司 | Time-sharing multiplexing and self-adapting method for temperature and leakage current detection channels |
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| CN113447616B (en) * | 2021-06-22 | 2022-09-02 | 成都归谷环境科技有限责任公司 | PWM output value calculation method of CO2 sensor |
| CN114383657A (en) * | 2021-12-30 | 2022-04-22 | 成都天地直方发动机有限公司 | Multifunctional mining sensor detection system |
| CN114383657B (en) * | 2021-12-30 | 2023-11-14 | 成都天地直方发动机有限公司 | Multifunctional mining sensor detection system |
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Application publication date: 20190111 |