CN113027531B - Cold region tunnel freeze injury regulation and control system based on Internet of things - Google Patents
Cold region tunnel freeze injury regulation and control system based on Internet of things Download PDFInfo
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- 230000009746 freeze damage Effects 0.000 title description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 230000008014 freezing Effects 0.000 claims abstract description 19
- 238000007710 freezing Methods 0.000 claims abstract description 19
- 230000006378 damage Effects 0.000 claims abstract description 16
- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 15
- 208000014674 injury Diseases 0.000 claims abstract description 15
- 230000008054 signal transmission Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000006855 networking Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention discloses a cold region tunnel freezing injury regulation and control system based on the Internet of things, which comprises a signal comparison module, a frequency comparison module, a detection AND gate module and a driving emission module, wherein a triode Q3 is used for detecting an output signal of an AND gate comparator U1, an analog-to-digital conversion module is arranged at the input end of the AND gate comparator U1, a digital-to-analog conversion module is arranged at the output end of the AND gate comparator U1, when the AND gate comparator U1 outputs a high level, the triode Q3 is conducted, a relay K1 is powered on, a signal transmission channel of the Internet of things router is directly disconnected, meanwhile, a signal is sent to a terminal of the cold region tunnel freezing injury regulation and control system of the Internet of things by a signal transmitter E1, the terminal of the cold region tunnel freezing injury regulation and control system of the Internet of things can give an early warning in time, and relevant personnel can be informed to overhaul corresponding sensors.
Description
Technical Field
The invention relates to the technical field of Internet of things, in particular to a cold region tunnel freezing injury regulation and control system based on the Internet of things.
Background
With the continuous development of traffic construction in China, more and more engineering cases are used for constructing tunnels in severe cold areas. The cold region tunnel is affected by cold weather, and is easy to freeze damage, such as frost cracking, spalling and the like of the tunnel lining. In the prior art, a cold region tunnel freezing early warning system and a method (application No. 2018102288914) perform long-term real-time monitoring on stress and strain of a tunnel lining structure by selecting a section of a cold region tunnel portal, which is likely to generate lining structure freezing, timely master stress and deformation states of the tunnel lining structure, timely eliminate unsafe factors of the tunnel lining structure through early warning, provide technical support for ensuring operation safety of the cold region tunnel, and can well predict the occurrence of the cold region tunnel freezing;
however, the cold region tunnel freeze injury regulation and control system based on the Internet of things comprises a cold region tunnel freeze injury early warning system, in the application process, the monitoring area and efficiency of the early warning system for the cold region tunnel freezing injury are improved by adding the Internet of things, in practical application, certain conditions for the signal transmission of the sensor of the Internet of things are not considered, particularly when the temperature is minus 30-40 ℃ in the north, the tunnel freeze injury early warning system in the cold region transmits the signal by using a 4G router, even if the 5G router is used for transmitting signals, the signal attenuation is increased when the temperature is 40-50 ℃ below zero in the north, even the router is stuck, and the key period for monitoring the freezing injury of the tunnel in the cold region is in the moment, even if the sensor is specially made or frequency-adjusted, the signal transmission in the cold winter environment is attenuated, therefore, signals in the transmission and receiving processes of the internet of things cold region tunnel freezing damage monitoring sensor and the router need to be monitored and judged specially in real time.
Disclosure of Invention
In view of the above situation, the system and the method can monitor the signals received by the internet of things router in the cold region tunnel freeze injury regulation and control system in real time, and can directly trigger the frequency regulation module and the signal compensation module of the internet of things router to work according to the monitoring state, and even can directly disconnect the signal transmission channel of the internet of things router.
The technical scheme includes that the device comprises a signal comparison module, a frequency comparison module, a detection AND gate module and a driving emission module, wherein the signal comparison module samples data signals sent by an Internet of things router by using a signal sampler, amplifies the sampling analog signals subjected to digital-to-analog conversion in phase by using an operational amplifier AR1, denoises by using a noise reduction circuit composed of an operational amplifier AR2, a capacitor C1 and a capacitor C2, and finally compares data reference signals with output signals of the operational amplifier AR2 by using an operational amplifier AR 4;
the frequency comparison module samples the frequency of a data signal sent by the router of the Internet of things by using a frequency sampler, amplifies the frequency sampling analog signal subjected to digital-to-analog conversion in the same phase by using an operational amplifier AR5, and compares a frequency reference signal with an output signal of an operational amplifier AR5 by using an operational amplifier AR 6;
the detection and gate module detects an output signal of an operational amplifier AR4 by using a triode Q1, if the output voltage of the operational amplifier AR4 is at a high level, the triode Q1 is conducted, a trigger signal compensation module performs signal compensation on a data signal sent by the Internet of things router and inputs the data signal into a first input port of an AND gate comparator U1 through an adjustable resistor RW1, meanwhile, the triode Q2 detects the output signal of the operational amplifier AR6, if the output voltage of the operational amplifier AR4 is at the high level, the triode Q2 is conducted, the frequency adjustment module of the Internet of things router is directly triggered to adjust the data transmission frequency and inputs the data transmission frequency into a second input port of the AND gate comparator U1 through the adjustable resistor RW 2;
the driving transmitting module detects an output signal of the AND gate comparator U1 by using a triode Q3, wherein an analog-to-digital conversion module is arranged at the input end of the AND gate comparator U1, a digital-to-analog conversion module is arranged at the output end of the AND gate comparator U1, when the AND gate comparator U1 outputs a high level, the triode Q3 is conducted, a relay K1 is powered on, a signal transmission channel of the Internet of things router is directly disconnected, and meanwhile, a signal transmitter E1 sends a signal to a terminal of a tunnel freezing injury regulation and control system in a cold region of the Internet of things.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1. when the signal attenuation is abnormal, the triode Q1 is conducted, the direct trigger signal compensation module carries out signal compensation on the data signal sent by the Internet of things router, compensates the attenuation voltage emitted by the signal Internet of things router, identifies different standards of the voltage of the triode Q1 and the voltage of the AND gate comparator U1 for adjusting, and inputs the different standards into the first input port of the AND gate comparator U1 through the adjustable resistor RW 1; if the signal frequency is abnormal in the severe cold environment, the triode Q2 is conducted, and the frequency adjusting module of the router of the internet of things is directly triggered to adjust the data transmitting frequency; if both are unusual, the sensor itself can not normally work under severe cold weather, consequently AND gate comparator U1 output is high level signal this moment, triode Q3 switches on, relay K1 gets electric, the direct disconnection thing networking router signal transmission passageway, signal transmitter E1 sends the signal to thing networking cold district tunnel freeze injury governing system terminal simultaneously, thing networking cold district tunnel freeze injury governing system terminal is early warning in time, inform relevant personnel to overhaul corresponding sensor.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Because the cold region tunnel freezing injury regulation and control system is characterized in that a sensor collects cold region tunnel information, signals are transmitted between Internet of things routers, in order to monitor the signal state of the Internet of things routers under cold conditions all the time, firstly, a signal comparison module samples data signals sent by the Internet of things routers by using a signal sampler (the model of the signal sampler can be selected as GN 2012), meanwhile, an operational amplifier AR1 is used for amplifying the sampling analog signals after digital-to-analog conversion in phase, in order to ensure the accuracy of the signals, a noise reduction circuit consisting of an operational amplifier AR2, a capacitor C1 and a capacitor C2 is used for denoising, a high-frequency signal is directly coupled to the output end of the operational amplifier AR2 by using the capacitor C1, the signal-to-noise ratio of the output end of the operational amplifier AR1 is improved, meanwhile, a RC filter circuit consisting of a resistor R3 and a capacitor C2 is used for filtering the signal clutter of the in-phase input end of the operational amplifier AR2, the noise reduction effect is realized, and meanwhile, a data reference signal is buffered by the operational amplifier AR3, and finally, the data reference signal is compared with the output signal of the operational amplifier AR2 by using the operational amplifier AR4, when the signal attenuation is abnormal, the voltage of the inverting input end of the operational amplifier AR4 is too low, the output signal of the operational amplifier AR4 is a high voltage signal, the triode Q1 is conducted, the direct trigger signal compensation module performs signal compensation on the data signal sent by the Internet of things router, compensates the attenuation voltage sent by the signal Internet of things router, and is input into the first input port of the AND gate comparator U1 through the adjustable resistor RW1, the adjustable resistor RW1 plays a role of attenuating voltage, since there is a certain attenuation state in normal signal transmission, the signal output by the op amp AR4 is prevented from being a normal signal, i.e. a low voltage signal, however, the and gate comparator U1 recognizes that the high level of the numerator is sensitive, and therefore, the adjustable resistor RW1 needs to be further attenuated before being input into the first input end of the and gate comparator U1;
similarly, the frequency comparison module samples the frequency of the data signal sent by the router of the internet of things by using a frequency sampler (which may be a frequency sampler of the type SAS 6812A), amplifies the frequency-sampled analog signal subjected to digital-to-analog conversion in the same phase by using an operational amplifier AR5, inputs a frequency reference signal into the inverting input end of the operational amplifier AR6 after buffering the signal by using the operational amplifier AR7, compares the frequency reference signal with the output signal of the operational amplifier AR5 by using the operational amplifier AR6, if the signal frequency is abnormal in a severe cold environment, that is, the frequency is abnormal too high, the potential of the inverting input end of the operational amplifier AR6 is abnormal too high, that is, the operational amplifier AR6 outputs a high-level signal, the triode Q2 is turned on, directly triggers the frequency adjustment module of the router of the internet of things to adjust the data transmission frequency, and inputs the frequency-sampled analog signal into the second input end of the gate comparator U1 by using the adjustable resistor 2, wherein the function of the adjustable resistor 2 is the same as the function of the adjustable resistor 1, the voltage identification is different standards for adjusting the voltage identification of the transistor Q2 and the AND gate comparator U1.
Finally, the AND gate comparator U1 receives signals output by the operational amplifier AR4 and the operational amplifier AR6, if the signals are abnormal, namely the outputs of the operational amplifier AR4 and the operational amplifier AR6 are both high level, the signal abnormality at the moment can not be adjusted by the signal compensation module and the router frequency adjustment module alone, and possibly the sensor itself can not work normally under severe cold weather, so the AND gate comparator U1 outputs a high level signal at the moment, wherein the input end of the AND gate comparator U1 is provided with an analog-to-digital conversion module, the output end of the AND gate comparator U1 is provided with a digital-to-analog conversion module, when the AND gate comparator U1 outputs high level, the triode Q3 is conducted, the relay K1 is powered, the signal transmission channel of the Internet of things router is directly disconnected, meanwhile, the signal emitter E1 sends a signal to the cold region tunnel freezing injury regulation and control system terminal of the Internet of the cold region, and the cold region tunnel freezing injury regulation and control system terminal of the Internet of things can give an early warning in time, and informing related personnel to overhaul the corresponding sensor, otherwise, outputting the signal of low level by the AND gate comparator U1, and driving the emission module to stop working because the triode Q3 is not conducted.
In the specific structure of the signal comparison module, the non-inverting input terminal of the operational amplifier AR1 is connected to the signal sampling input port of the router, the input signal is a sampled analog signal after digital-to-analog conversion, the inverting input terminal of the operational amplifier AR1 is connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R1 is grounded, the other end of the resistor R2 is connected to the output terminal of the operational amplifier AR1 and one end of the resistor R3 and the capacitor C1, the other end of the resistor R3 is connected to one end of the capacitor C2 and the non-inverting input terminal of the operational amplifier AR2, the other end of the capacitor C2 is grounded, the other end of the capacitor C1 is connected to the output terminal of the operational amplifier AR2 and one end of the resistor R5 and the inverting input terminal of the operational amplifier AR4, the inverting input terminal of the operational amplifier AR2 is connected to one end of the resistor R4 and the other end of the resistor R5, the other end of the resistor R4 is grounded, the non-inverting input terminal of the operational amplifier AR4 is connected to one end of the non-inverting input terminal R6, the non-inverting input terminal of the operational amplifier AR4, and the non-inverting input terminal of the operational amplifier R6 is connected to one end of the amplifier AR3, The inverting input end of the operational amplifier AR3 is connected with the data reference signal at the non-inverting input end; the frequency comparison module comprises an operational amplifier AR5, wherein the in-phase input end of the operational amplifier AR5 is connected with a data signal frequency sampling input port, the frequency sampling signal is a sampling frequency analog signal after digital-to-analog conversion, the reverse-phase input end of the operational amplifier AR5 is connected with one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R8 is grounded, the other end of the resistor R9 is connected with the output end of the operational amplifier AR5 and the in-phase input end of the operational amplifier AR6, the reverse-phase input end of the operational amplifier AR6 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with the reverse-phase input end and the output end of the operational amplifier AR7, and the in-phase input end of the operational amplifier AR7 is connected with a frequency reference signal;
the detection and gate module comprises an adjustable resistor RW1, one end of the adjustable resistor RW1 is connected with a base electrode of a triode Q1 and an output end of an operational amplifier AR4, a collector electrode of the triode Q1 is connected with +3.3V of a power supply, an emitter electrode of the triode Q1 is connected with one end of a resistor R7 and an input port of a signal compensation module, the other end of the resistor R7 is grounded, the other end of the adjustable resistor RW1 is grounded, the sliding end of an adjustable resistor RW1 is connected with a first input port of an AND gate comparator U1, a second input port of the AND gate comparator U1 is connected with the sliding end of the adjustable resistor RW2, one end of the adjustable resistor RW2 is connected with a base electrode of the triode Q2 and an output end of the operational amplifier AR6, an emitter electrode circuit of the triode Q2 is connected with an input port of the operational amplifier frequency adjustment module, a collector electrode of the triode Q2 is connected with +2.5V of the collector electrode, and the other end of the adjustable resistor RW2 is grounded; the driving transmitting module comprises a triode Q3, the collector of the triode Q3 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with +5V of a power supply, the base of the triode Q3 is connected with the output end of an AND gate comparator U1, the emitter of the triode Q3 is connected with one end of a resistor R11 and the power supply end of a relay K1, the grounding end of a relay K1 is grounded, the contact 3 of the relay K1 is connected with one end of a resistor R13, the other end of the resistor R13 is grounded, the contact 4 of the relay K1 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with a signal output port, and the contact 5 of the relay K1 is connected with a signal input port of a router.
When the system is used in detail, because the cold region tunnel freezing injury regulation and control system is characterized in that a sensor collects cold region tunnel information, signals are transmitted among Internet of things routers, in order to monitor the signal state of the Internet of things routers under cold conditions at any time, firstly, a signal comparison module samples data signals sent by the Internet of things routers by using a signal sampler (the signal sampler with the model of GN2012 can be selected), meanwhile, data reference signals buffer signals by using an operational amplifier AR3 to play a role of smoothing the signals, and finally, an operational amplifier AR4 is used for comparing the data reference signals with signals output by the operational amplifier AR2, when the signals are attenuated abnormally, the voltage of the reverse phase input end of the operational amplifier AR4 is too low, the signals output by the operational amplifier AR4 are high-voltage signals, a triode Q1 is conducted, and a direct trigger signal compensation module compensates the data signals sent by the Internet of things routers, compensating the attenuation voltage emitted by the signal internet-of-things router, and in a similar way, the frequency comparison module samples the frequency of the data signal sent by the internet-of-things router by using a frequency sampler (the frequency sampler with the model of SAS6812A can be selected), amplifies the frequency sampling analog signal subjected to digital-to-analog conversion by using the operational amplifier AR5 in the same phase, meanwhile, a frequency reference signal is buffered by the operational amplifier AR7 and then is input into the reverse phase input end of the operational amplifier AR6, the operational amplifier AR6 compares the frequency reference signal with the output signal of the operational amplifier AR5, if the frequency of the signal is abnormal in a severe cold environment, namely the frequency is abnormal, the potential of the non-phase input end of the operational amplifier AR6 is abnormal, namely the operational amplifier AR6 outputs a high-level signal, the triode Q2 is switched on, directly triggering the frequency adjustment module of the internet-of-things router to adjust the data emission frequency, and finally the AND gate comparator U1 receives the operational amplifier AR4, If the signals output by the operational amplifier AR6 are both abnormal, that is, the outputs of the operational amplifier AR4 and the operational amplifier AR6 are both at high level, the signal abnormality at this time cannot be adjusted by the signal compensation module and the router frequency adjustment module alone, and it is possible that the sensor itself cannot normally operate in severe cold weather, so the and gate comparator U1 outputs a high level signal at this time, wherein, the input end of the AND gate comparator U1 is provided with an analog-to-digital conversion module, the output end of the AND gate comparator U1 is provided with a digital-to-analog conversion module, when the AND gate comparator U1 outputs high level, the triode Q3 is conducted, the relay K1 is electrified, the signal transmission channel of the router of the Internet of things is directly disconnected, meanwhile, the signal emitter E1 sends a signal to the Internet of things cold region tunnel freezing injury regulation and control system terminal, the Internet of things cold region tunnel freezing injury regulation and control system terminal gives an early warning in time, and related personnel are notified to overhaul corresponding sensors.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (1)
1. A cold region tunnel freezing injury regulation and control system based on the Internet of things comprises a signal comparison module, a frequency comparison module, a detection AND gate module and a driving emission module, and is characterized in that the signal comparison module samples data signals sent by a router of the Internet of things by using a signal sampler, amplifies the sampled analog signals after digital-to-analog conversion in phase by using an operational amplifier AR1, denoises by using a noise reduction circuit consisting of an operational amplifier AR2, a capacitor C1 and a capacitor C2, and finally compares data reference signals with output signals of the operational amplifier AR2 by using an operational amplifier AR 4;
the frequency comparison module samples the frequency of a data signal sent by the router of the Internet of things by using a frequency sampler, amplifies the frequency sampling analog signal subjected to digital-to-analog conversion in the same phase by using an operational amplifier AR5, and compares a frequency reference signal with an output signal of an operational amplifier AR5 by using an operational amplifier AR 6;
the detection and gate module detects an output signal of an operational amplifier AR4 by using a triode Q1, if the output voltage of the operational amplifier AR4 is at a high level, the triode Q1 is conducted, a trigger signal compensation module performs signal compensation on a data signal sent by the Internet of things router and inputs the data signal into a first input port of an AND gate comparator U1 through an adjustable resistor RW1, meanwhile, the triode Q2 detects the output signal of the operational amplifier AR6, if the output voltage of the operational amplifier AR6 is at the high level, the triode Q2 is conducted, the frequency adjustment module of the Internet of things router is directly triggered to adjust the data transmission frequency and inputs the data transmission frequency into a second input port of the AND gate comparator U1 through the adjustable resistor RW 2;
the driving transmitting module detects a signal output by an AND gate comparator U1 by using a triode Q3, wherein an analog-to-digital conversion module is arranged at the input end of the AND gate comparator U1, a digital-to-analog conversion module is arranged at the output end of the AND gate comparator U1, when the AND gate comparator U1 outputs a high level, the triode Q3 is conducted, a relay K1 is powered on, a signal transmission channel of the Internet of things router is directly disconnected, and meanwhile, a signal transmitter E1 sends a signal to a terminal of a tunnel freezing injury regulation and control system in a cold region of the Internet of things;
the detection and gate module comprises an adjustable resistor RW1, one end of the adjustable resistor RW1 is connected with a base electrode of a triode Q1 and an output end of an operational amplifier AR4, a collector electrode of the triode Q1 is connected with +3.3V of a power supply, an emitter electrode of the triode Q1 is connected with one end of a resistor R7 and an input port of a signal compensation module, the other end of the resistor R7 is grounded, the other end of the adjustable resistor RW1 is grounded, the sliding end of an adjustable resistor RW1 is connected with a first input port of an AND gate comparator U1, a second input port of the AND gate comparator U1 is connected with the sliding end of the adjustable resistor RW2, one end of the adjustable resistor RW2 is connected with a base electrode of the triode Q2 and an output end of the operational amplifier AR6, an emitter electrode circuit of the triode Q2 is connected with an input port of the operational amplifier frequency adjustment module, a collector electrode of the triode Q2 is connected with +2.5V of the collector electrode, and the other end of the adjustable resistor RW2 is grounded;
the driving transmitting module comprises a triode Q3, the collector of a triode Q3 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with +5V of a power supply, the base of the triode Q3 is connected with the output end of an AND gate comparator U1, the emitter of a triode Q3 is connected with one end of a resistor R11 and the power supply end of a relay K1, the grounding end of a relay K1 is grounded, a contact 3 of the relay K1 is connected with one end of a resistor R13, the other end of the resistor R13 is grounded, a contact 4 of the relay K1 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with a signal output port, and a contact 5 of the relay K1 is connected with a signal input port of a router;
the signal comparison module comprises an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with a router signal sampling input port, the input signal of the router signal sampling input port is a sampling analog signal after digital-to-analog conversion, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R1 is grounded, the other end of the resistor R2 is connected with the output end of the operational amplifier AR1 and one end of a resistor R3 and a capacitor C1, the other end of the resistor R3 is connected with one end of a capacitor C2 and the non-inverting input end of the operational amplifier AR2, the other end of a capacitor C2 is grounded, the other end of a capacitor C1 is connected with the output end of the operational amplifier AR2 and one end of a resistor R5 and the inverting input end of the operational amplifier AR4, the inverting input end of the operational amplifier AR4 AR, one end of the resistor R5, the other end of the resistor R4 is connected with the non-inverting input end of the operational amplifier AR4, the other end of the operational amplifier AR4 is grounded, the non-inverting input end of the operational amplifier AR4 is connected with the non-inverting input end of the amplifier AR4, The inverting input end of the operational amplifier AR3 is connected with the data reference signal at the non-inverting input end;
the frequency comparison module comprises an operational amplifier AR5, wherein the in-phase input end of the operational amplifier AR5 is connected with a data signal frequency sampling input port, the frequency sampling signal of the data signal frequency sampling input port is a sampling frequency analog signal after digital-to-analog conversion, the reverse-phase input end of the operational amplifier AR5 is connected with one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R8 is grounded, the other end of the resistor R9 is connected with the output end of the operational amplifier AR5 and the in-phase input end of the operational amplifier AR6, the reverse-phase input end of the operational amplifier AR6 is connected with one end of a resistor R10, the other end of the resistor R10 is connected with the reverse-phase input end and the output end of the operational amplifier AR7, and the in-phase input end of the operational amplifier AR7 is connected with a frequency reference signal.
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|---|---|---|---|---|
| GB619957A (en) * | 1946-02-14 | 1949-03-17 | Farnsworth Television & Radio | Rectifier circuit frequency multiplier |
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| CN112395171A (en) * | 2020-12-14 | 2021-02-23 | 深圳市知德信息技术咨询有限公司 | Block chain enterprise data management system |
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2021
- 2021-03-30 CN CN202110343931.1A patent/CN113027531B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB619957A (en) * | 1946-02-14 | 1949-03-17 | Farnsworth Television & Radio | Rectifier circuit frequency multiplier |
| CN107948025A (en) * | 2017-11-03 | 2018-04-20 | 黄河科技学院 | The Internet of Things signal condition indicating circuit of internet of things home appliance |
| CN109104163A (en) * | 2018-09-30 | 2018-12-28 | 张健 | A kind of bridge project management system based on Internet of Things |
| CN110380744A (en) * | 2019-07-31 | 2019-10-25 | 江苏省苏中建设集团股份有限公司 | A kind of construction site management of fire safety system based on Internet of Things |
| CN112395171A (en) * | 2020-12-14 | 2021-02-23 | 深圳市知德信息技术咨询有限公司 | Block chain enterprise data management system |
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