CN109194358B - Hydrology water resource data transmission system based on thing networking - Google Patents
Hydrology water resource data transmission system based on thing networking Download PDFInfo
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- CN109194358B CN109194358B CN201811159543.2A CN201811159543A CN109194358B CN 109194358 B CN109194358 B CN 109194358B CN 201811159543 A CN201811159543 A CN 201811159543A CN 109194358 B CN109194358 B CN 109194358B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The invention discloses a hydrology and water resource data transmission system based on the Internet of things, which comprises a signal receiving circuit, a frequency modulation calibration circuit and a voltage stabilization output circuit, wherein the signal receiving circuit receives signals at the input end of a signal transmission channel for a control terminal in the hydrology and water resource data transmission system based on the Internet of things, the signals are filtered by a pi-shaped filter circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2, the frequency modulation calibration circuit receives the signals from the signal receiving circuit in two paths, one path of the signals is subjected to frequency modulation by a frequency modulation circuit consisting of a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, the other path of the signals is subjected to attenuation by an attenuation circuit consisting of a potentiometer RW2, a capacitor C3 and a capacitor C4, then an interference signal filtering circuit consisting of a capacitor C6-C9, a voltage stabilizing tube D1 and a triode Q3 is used for filtering interference signals, and finally the voltage stabilization output circuit uses a triode Q85, the automatic calibration of the signal is realized, and the signal distortion is prevented.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a hydrology and water resource data transmission system based on the Internet of things.
Background
Hydrology water resource based on thing networking is along with the continuous development of internet of things, realized remote control terminal can be real-time with regional jurisdiction within the hydrology water resource real time monitoring, people have improved people to hydrology water resource management efficiency, wherein the hydrology water resource data transmission system based on thing networking is important component, transmission system will confirm whether the signal can distort in the transmission, and among the hydrology water resource data transmission process, the environmental variation is big, temperature, humidity, especially, the interference of various electronic equipment or the electromagnetic interference between the numerous signal, need guarantee in real time that the signal in the signal transmission passageway for control terminal can be stable and efficient transmission among the hydrology water resource data transmission system based on thing networking.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the invention aims to provide a hydrology and water resource data transmission system based on the internet of things, which has the characteristics of ingenious conception and humanized design, detects signals in a signal transmission channel for a control terminal in the hydrology and water resource data transmission system based on the internet of things in real time, and can automatically calibrate the signals and prevent signal distortion.
The technical scheme includes that the hydrology and water resource data transmission system based on the Internet of things comprises a signal receiving circuit, a frequency modulation calibration circuit and a voltage stabilization output circuit, wherein the signal receiving circuit receives signals at the input end of a signal transmission channel for a control terminal in the hydrology and water resource data transmission system based on the Internet of things, the signals are filtered through a pi-type filter circuit formed by an inductor L1, a capacitor C1 and a capacitor C2, the frequency modulation calibration circuit receives the signals in two paths, one path of the signals is subjected to frequency modulation through a frequency modulation circuit formed by a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, a double-T frequency selection circuit formed by resistors R11-R13 and capacitors C10-C12 is designed to screen out single frequency signals in the signals, the signals are attenuated through an attenuation circuit formed by a potentiometer 2, a capacitor C3 and a capacitor C4, and then capacitors C6-C9, a voltage regulator D1 and D1 are, An interference signal filtering circuit composed of a triode Q3 is filtered by clutter, wherein a triode Q4 plays a role in feeding back and adjusting the frequency of an output signal of a frequency modulation circuit, and finally the voltage stabilizing output circuit is stabilized and output by a triode voltage stabilizing circuit composed of a triode Q5 and a voltage stabilizing tube D4, namely the output is input into a signal transmission channel for a control terminal in a hydrology and water resource data transmission system based on the Internet of things;
the frequency modulation calibration circuit comprises a triode Q1, the base of a triode Q1 is connected with one end of a capacitor C14, one end of a capacitor C15 and one end of a resistor R5, the other end of the resistor R5 is grounded, the other end of a capacitor C14 is connected with the negative electrode of a diode D3, the collector of a triode Q1 is connected with the other end of the capacitor C15, the collector of a triode Q2 and one end of a capacitor C5, the emitter of a triode Q1 is connected with one end of a resistor R6 and a capacitor C16, the base of a triode Q2 is connected with the collector of a triode Q4 and one end of a resistor R7, the emitter of a triode Q2 is connected with one end of a resistor R8 and a resistor R12 and one end of a capacitor C10, the other end of a capacitor C5 is connected with one end of a capacitor C13, the other ends of a resistor R6 and a resistor R7 and the other end of a resistor R8 and one end of a capacitor C16, the other end of a capacitor C13 and the other end of a capacitor R12, the other ends of the resistor R and the capacitor C are grounded, the other ends of the resistor R and the capacitor C are connected with the non-inverting input end of the operational amplifier AR, the anode of the diode D is connected with the anode of the diode D, the cathode of the diode D is connected with one end of the resistor R, the other end of the resistor R is connected with the contact 2 of the potentiometer RW, one end of the capacitor C, the collector of the triode Q and the emitter of the triode Q, the contact 1 of the potentiometer RW is connected with the other end of the capacitor C and one end of the capacitor C, the contact 3 of the potentiometer RW is connected with the other end of the capacitor C and one end of the resistor R, the other end of the resistor R is connected with one end of the capacitor C, the base of the triode Q is connected with the base of the triode Q and the other end of the capacitor C, the other end of the capacitor C9 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of a voltage regulator tube D1 is grounded, and the other end of the resistor R10 is connected with the inverting input end of the amplifier AR 3.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1. the attenuator circuit composed of the potentiometer RW2, the capacitor C3 and the capacitor C4 attenuates, high potential signals cannot be directly used for detecting signal abnormality, attenuation is needed first and then detection is needed, the attenuated signals are filtered by noise through an interference signal filtering circuit composed of the capacitors C6-C9, the voltage regulator tube D1 and the triode Q3, the triode Q4 plays a role in feeding back and adjusting the frequency of the output signals of the frequency modulation circuit, the triode Q4 is used for coordinating two paths of signals, when the two paths of output signals are abnormal in frequency and contain low level signals, the triode Q4 is conducted, signals are fed back to the base electrode potential of the triode Q2, the two paths of signals can be compared through the final operational amplifier AR3, the operational amplifier AR3 plays a role of a comparator at the moment, automatic calibration of the signals is achieved, and signal distortion is prevented.
2. The frequency modulation circuit formed by the triode Q1, the triode Q2, the capacitor C15 and the capacitor C16 is used for frequency modulation, stabilizing the signal frequency and preventing the signal frequency from being interfered by other equipment signals, so that the signal frequency is abnormal, the stable signal frequency does not have abnormal frequency, and a single-frequency signal is needed, and therefore, a double-T frequency selection circuit formed by the resistors R11-R13 and the capacitors C10-C12 is designed to screen out the single-frequency signal in the signal.
Drawings
Fig. 1 is a block diagram of a hydrology and water resource data transmission system based on the internet of things.
Fig. 2 is a schematic diagram of the internet of things-based hydrology and water resource data transmission system.
Detailed Description
The foregoing and other technical matters, features and effects 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 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
In the first embodiment, the Internet of things-based hydrology and water resource data transmission system comprises a signal receiving circuit, a frequency modulation calibration circuit and a voltage stabilization output circuit, wherein the signal receiving circuit receives signals at the input end of a signal transmission channel for a control terminal in the Internet of things-based hydrology and water resource data transmission system, the signals are filtered by a pi-type filter circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2, the frequency modulation calibration circuit receives the signals output by the signal receiving circuit in two paths, one path of the signals is subjected to frequency modulation by a frequency modulation circuit consisting of a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, a double-T frequency selection circuit consisting of resistors R11-R13 and capacitors C10-C12 is designed to screen out single frequency signals, the other path of the signals is attenuated by an attenuator RW2, a capacitor C3 and a capacitor C4, and then an interference signal filtering circuit consisting of capacitors C6-C9, a voltage regulator D1 and a triode Q3 is applied, the triode Q4 plays a role in feeding back and adjusting the frequency of the output signal of the frequency modulation circuit, and finally the voltage-stabilizing output circuit utilizes a triode voltage-stabilizing circuit consisting of a triode Q5 and a voltage-stabilizing tube D4 to stabilize the voltage and then output the voltage, namely the voltage is input into a signal transmission channel for a control terminal in the Internet of things-based hydrology and water resource data transmission system;
the frequency modulation calibration circuit receives signals output by the signal receiving circuit in two paths, one path of the frequency modulation calibration circuit is subjected to frequency modulation through a frequency modulation circuit consisting of a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, the signal frequency is stabilized, the situation that the signal frequency is abnormal due to the interference of other equipment signals is prevented, the stable signal frequency does not have abnormal frequency, but needs single frequency signals, therefore, a double-T frequency selection circuit consisting of resistors R11-R13 and capacitors C10-C12 is designed to screen out the single frequency signals in the signals, two paths of the signals are attenuated through an attenuation circuit consisting of a potentiometer RW2, a capacitor C3 and a capacitor C4, high potential signals cannot be directly used for detecting the signal abnormality and need to be attenuated and then detected, the attenuated signals are filtered out by noise waves through an interference signal circuit consisting of capacitors C6-C9, a voltage regulator D1 and a triode Q3, wherein the triode Q4 plays a role in feeding back and adjusting the frequency of the frequency, the triode Q4 is used for coordinating two paths of signals, when the frequency of two paths of output signals is abnormal and contains low level signals, the triode Q4 is conducted, a signal is fed back to the base electrode potential of the triode Q2, the frequency of the output signal of one path of signals is reduced, the final operational amplifier AR3 can compare the two paths of signals, and the operational amplifier AR3 plays a role of a comparator at the moment, so that the automatic calibration of the signals is realized, and the signal distortion is prevented;
the frequency modulation calibration circuit has a specific circuit structure, wherein the base electrode of a triode Q is connected with one end of a capacitor C, one end of the capacitor C and one end of a resistor R, the other end of the resistor R is grounded, the other end of the capacitor C is connected with the negative electrode of a diode D, the collector electrode of the triode Q is connected with the other end of the capacitor C, the collector electrode of the triode Q is connected with one end of the capacitor C, the emitter electrode of the triode Q is connected with the collector electrode of the triode Q and one end of the resistor R, the emitter electrode of the triode Q is connected with the resistor R, one end of the resistor R and one end of the capacitor C, the other end of the capacitor C is connected with one end of the capacitor C, the other ends of the resistor R, the other end of the resistor R and one end of the capacitor C are grounded, the other end of the resistor R and one end of the capacitor C, the other ends of the resistor R and the capacitor C are grounded, the other ends of the resistor R and the capacitor C are connected with the non-inverting input end of the operational amplifier AR, the anode of the diode D is connected with the anode of the diode D, the cathode of the diode D is connected with one end of the resistor R, the other end of the resistor R is connected with the contact 2 of the potentiometer RW, one end of the capacitor C, the collector of the triode Q and the emitter of the triode Q, the contact 1 of the potentiometer RW is connected with the other end of the capacitor C and one end of the capacitor C, the contact 3 of the potentiometer RW is connected with the other end of the capacitor C and one end of the resistor R, the other end of the resistor R is connected with one end of the capacitor C, the base of the triode Q is connected with the base of the triode Q and the other end of the capacitor C, the other end of the capacitor C9 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of a voltage regulator tube D1 is grounded, and the other end of the resistor R10 is connected with the inverting input end of the amplifier AR 3.
In the second embodiment, on the basis of the first embodiment, a signal at the input end of a signal transmission channel for a control terminal in a hydrological and water resource data transmission system based on the internet of things is received, and is filtered by a pi-type filter circuit composed of an inductor L1, a capacitor C1 and a capacitor C2, so that the anti-interference performance of the signal is improved, one end of the capacitor C1 is connected with one end of an inductor L1 and a signal input port, the other end of the capacitor C1 is grounded, the other end of the inductor L1 is connected with one end of a capacitor C2 and one end of a resistor R1, the other end of the capacitor C2 is grounded, and the other end of the resistor 483r 6 is connected with the.
In the third embodiment, on the basis of the first embodiment, the voltage stabilizing output circuit utilizes a triode voltage stabilizing circuit composed of a triode Q5 and a voltage stabilizing tube D4 to stabilize voltage and then output, so that the stability of signals is further improved, that is, the voltage stabilizing output circuit is input into a signal transmission channel for a control terminal in a hydrology and water resource data transmission system based on the internet of things, a collector of the triode Q5 is connected with one end of a resistor R14 and an output end of an operational amplifier AR3, a base of the triode Q5 is connected with the other end of the resistor R14 and a negative electrode of the voltage stabilizing tube D4, an anode of the voltage stabilizing tube D4 is grounded, and an emitter of the triode Q5 is connected.
When the system is used in detail, the hydrology and water resource data transmission system based on the Internet of things comprises a signal receiving circuit, a frequency modulation calibration circuit and a voltage stabilization output circuit, wherein the signal receiving circuit receives signals at the input end of a signal transmission channel for a control terminal in the hydrology and water resource data transmission system based on the Internet of things, the signals are filtered by a pi-shaped filter circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2, the frequency modulation calibration circuit receives the signals output by the signal receiving circuit in two paths, one path of the signals is subjected to frequency modulation by a frequency modulation circuit consisting of a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, the signal frequency is stabilized, the interference of other equipment signals is prevented from being received, the signal frequency is abnormal, the stable signal frequency does not have abnormal frequency, and needs a single frequency signal, so that a double T frequency selection circuit consisting of a resistor R11-R13 and a capacitor C10-C12 is designed at the same, two paths of signals are attenuated by an attenuator RW2, a capacitor C3 and a capacitor C4, high potential signals cannot be directly used for detecting signal abnormality and need to be attenuated and then detected, the attenuated signals are filtered by noise waves by an interference signal filtering circuit consisting of a capacitor C6-C9, a voltage stabilizing tube D1 and a triode Q3, wherein the triode Q4 plays a role in feeding back and adjusting the frequency of the output signals of the frequency modulation circuit, the triode Q4 is used for coordinating two paths of signals, when the two paths of output signals are abnormal in frequency and contain low level signals, the triode Q4 is conducted, the signals are fed back to the base electrode potential of the triode Q2, the frequency of the output signals of one path is reduced, so that a final operational amplifier AR3 can compare the two paths of signals, the operational amplifier AR3 plays a role of a comparator at the moment, and finally the voltage stabilizing output circuit outputs the signals after voltage stabilizing circuit consisting of the triode Q5 and the voltage stabilizing tube D, the automatic calibration of the signal is realized, and the signal distortion is prevented.
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. The hydrology and water resource data transmission system based on the Internet of things comprises a signal receiving circuit, a frequency modulation calibration circuit and a voltage stabilization output circuit, and is characterized in that the signal receiving circuit receives signals at the input end of a signal transmission channel, the signal transmission channel is used for a control terminal in the hydrology and water resource data transmission system based on the Internet of things, the signals are filtered through a pi-shaped filter circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2, the frequency modulation calibration circuit receives the output signals of the signal receiving circuit in two paths, the first path is subjected to frequency modulation through a frequency modulation circuit consisting of a triode Q1, a triode Q2, a capacitor C15 and a capacitor C16, single frequency signals in double-T frequency selection circuit signals consisting of resistors R11-R13 and capacitors C10-C12 are screened out, the second path is subjected to attenuation through an attenuation circuit consisting of a potentiometer 2, a capacitor RW 3 and a capacitor C4, and then the capacitors C6-C9 and a voltage stabilization tube D1, An interference signal filtering circuit composed of a triode Q3 is used for filtering clutter, wherein a triode Q4 feeds back and adjusts the frequency of an output signal of a frequency modulation circuit, and finally the voltage stabilization output circuit is used for stabilizing the voltage and outputting the voltage after a triode voltage stabilizing circuit composed of a triode Q5 and a voltage stabilizing tube D4 is used, namely the voltage and the output voltage is input into a signal transmission channel for a control terminal in a hydrology and water resource data transmission system based on the Internet of things;
the frequency modulation calibration circuit comprises a triode Q, the base electrode of the triode Q is connected with one end of a capacitor C, one end of the capacitor C and one end of a resistor R, the other end of the resistor R is grounded, the other end of the capacitor C is connected with the negative electrode of a diode D, the collector electrode of the triode Q is connected with the other end of the capacitor C, the collector electrode of the triode Q is connected with one end of the capacitor C and one end of the resistor R, the base electrode of the triode Q is connected with the collector electrode of the triode Q and one end of the resistor R, the emitter electrode of the triode Q is connected with the resistor R, one end of the resistor R and one end of the capacitor C, the other end of the capacitor C is connected with one end of the capacitor C, the other ends of the resistor R, the other end of the resistor R and one end of the capacitor C are grounded, the other end of the capacitor C, the other ends of the resistor R and the capacitor C are grounded, the other ends of the resistor R and the capacitor C are connected with the non-inverting input end of the operational amplifier AR, the anode of the diode D is connected with the anode of the diode D, the cathode of the diode D is connected with one end of the resistor R, the other end of the resistor R is connected with the contact 2 of the potentiometer RW, one end of the capacitor C, the collector of the triode Q and the emitter of the triode Q, the contact 1 of the potentiometer RW is connected with the other end of the capacitor C and one end of the capacitor C, the contact 3 of the potentiometer RW is connected with the other end of the capacitor C and one end of the resistor R, the other end of the resistor R is connected with one end of the capacitor C, the base of the triode Q is connected with the base of the triode Q and the other end of the capacitor C, the other end of the capacitor C9 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of a voltage regulator tube D1 is grounded, and the other end of the resistor R10 is connected with the inverting input end of the amplifier AR 3;
the signal receiving circuit comprises a capacitor C1, one end of a capacitor C1 is connected with one end of an inductor L1 and a signal input port, the other end of the capacitor C1 is grounded, the other end of the inductor L1 is connected with one end of a capacitor C2 and one end of a resistor R1, the other end of the capacitor C2 is grounded, and the other end of the resistor R1 is connected with the anode of a diode D3;
the voltage-stabilizing output circuit comprises a triode Q5, wherein the collector of the triode Q5 is connected with one end of a resistor R14 and the output end of an operational amplifier AR3, the base of the triode Q5 is connected with the other end of a resistor R14 and the negative electrode of a voltage-stabilizing tube D4, the positive electrode of the voltage-stabilizing tube D4 is grounded, and the emitter of the triode Q5 is connected with a signal output port.
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| CN201811159543.2A CN109194358B (en) | 2018-09-30 | 2018-09-30 | Hydrology water resource data transmission system based on thing networking |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021213A (en) * | 2015-07-02 | 2015-11-04 | 宁波摩米创新工场电子科技有限公司 | Emitter-coupling-type high-sensitivity photoelectric sensor system |
| CN106208767A (en) * | 2016-08-19 | 2016-12-07 | 天津市百利电气有限公司 | A kind of power supply of low pressure controller dynamic stability |
| CN107498769A (en) * | 2017-08-21 | 2017-12-22 | 濮阳市泰普胶粘制品有限公司 | Rolling mill roller skew correction circuitry |
| CN108566224A (en) * | 2018-04-26 | 2018-09-21 | 郑州工程技术学院 | Internet of Things system based on wireless network |
-
2018
- 2018-09-30 CN CN201811159543.2A patent/CN109194358B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021213A (en) * | 2015-07-02 | 2015-11-04 | 宁波摩米创新工场电子科技有限公司 | Emitter-coupling-type high-sensitivity photoelectric sensor system |
| CN106208767A (en) * | 2016-08-19 | 2016-12-07 | 天津市百利电气有限公司 | A kind of power supply of low pressure controller dynamic stability |
| CN107498769A (en) * | 2017-08-21 | 2017-12-22 | 濮阳市泰普胶粘制品有限公司 | Rolling mill roller skew correction circuitry |
| CN108566224A (en) * | 2018-04-26 | 2018-09-21 | 郑州工程技术学院 | Internet of Things system based on wireless network |
Non-Patent Citations (1)
| Title |
|---|
| "一种高电源抑制比无片外电容LDO设计";张伟等;《电子设计工程》;20180228;第26卷(第3期);全文 * |
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