CN111141986A - Weak current control monitoring system and method based on Internet of things - Google Patents
Weak current control monitoring system and method based on Internet of things Download PDFInfo
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Abstract
The invention provides a weak current control monitoring system and method based on the Internet of things, which comprises a monitoring module, a control module and a power supply module, wherein the monitoring module is used for receiving monitoring signals and transmitting the monitoring signals to the control module, and the monitoring signals comprise environment monitoring signals and current monitoring signals; the control module is used for receiving the environment monitoring signal and the current monitoring signal, converting the received monitoring signal into a fault signal and transmitting the fault signal into the interference module, wherein the fault signal comprises a circuit fault signal and an environment fault signal; the interference module is used for receiving the fault signal, regulating and controlling the circuit fault signal by adopting passive interference and regulating and controlling the environment fault signal by adopting active interference; the short-range communication module is used for transmitting signals among the monitoring module, the control module and the interference module, wherein the short-range communication module is formed by electrically connecting a plurality of ZigBee generators with the monitoring module, the control module and the interference module.
Description
Technical Field
The invention relates to the technical field of weak current monitoring, in particular to a weak current control monitoring system and method based on the Internet of things.
Background
At present, light current security protection is a crucial step in light current engineering, especially to the light current case in the family among the intelligent home engineering now, generally all can be through weak current crossover sub and the management and control power of configuration intelligent control in the light current case, among the prior art, only can detect the situation of light current case through the temperature, but its monitoring effect is relatively poor, and when environmental fault, often also can arouse the current-voltage trouble, with it the same current-voltage trouble, often also can make the temperature rise in the light current case. Therefore, the limitation of monitoring is high, the temperature in the weak current box can only be monitored, and the current of the weak current box cannot be detected, so that the reason of temperature rise cannot be judged, and further the weak current box cannot be prevented from being broken down and the reason of the fault of the weak current box cannot be judged.
Disclosure of Invention
The invention provides a weak current control monitoring system and method based on the Internet of things, which are used for solving the problems that a weak current box is not strong in monitoring effect and monitoring efficiency and cannot control the protection of a weak current system.
The utility model provides a weak current control monitoring system based on thing networking which characterized in that includes:
the monitoring module is used for receiving monitoring signals and transmitting the monitoring signals to the control module, wherein the monitoring signals comprise environment monitoring signals and current monitoring signals;
the control module is used for receiving the environment monitoring signal and the current monitoring signal, converting the received monitoring signal into a fault signal and transmitting the fault signal into the interference module, wherein the fault signal comprises a circuit fault signal and an environment fault signal;
the interference module is used for receiving the fault signal, regulating and controlling the circuit fault signal by adopting passive interference and regulating and controlling the environment fault signal by adopting active interference;
the short-range communication module is used for carrying out wireless signal transmission among the monitoring module, the control module and the interference module, wherein the short-range communication module is formed by electrically connecting a plurality of ZigBee generators with the monitoring module, the control module and the interference module.
Further: the monitoring module consists of a temperature feedback circuit and a current-voltage transmitter connected with a weak current box in series, wherein,
the temperature feedback circuit is composed of a platinum resistor RG, a first direct current power supply, a second direct current power supply, an operational amplifier and a comparator, wherein the first direct current power supply is connected with the platinum resistor RG in series and is connected with the inverting input end of the operational amplifier, the output end of the operational amplifier is connected with the first resistor in series and is connected with the positive input end of the comparator, the output end of the comparator is externally connected with the ZigBee generator, wherein,
the first direct current power supply is also electrically connected with the first resistor through a first capacitor, is electrically connected with the input end of the comparator through a voltage stabilizing diode, and is electrically connected with the output end of the comparator;
the positive phase input end of the operational amplifier is connected with the grounding end, a second capacitor is further connected between the positive phase input end and the grounding end, and the negative phase input end is electrically connected with the output end of the operational amplifier; a third resistor is connected between the inverting input end and the output end of the operational amplifier;
the third input end of the comparator is connected with the second direct-current power supply, the second direct-current power supply is also electrically connected with the output end of the comparator, and a fourth resistor is also connected between the second direct-current power supply and the output end of the comparator;
the negative input end of the comparator is connected with the grounding end, and a second resistor is further connected between the negative input end of the comparator and the grounding end;
further: the current voltage transducer is used for receiving a power supply end current voltage fluctuation signal in the weak current box, inputting the current voltage fluctuation signal into the ZigBee generator and transmitting the current voltage fluctuation signal into the ZigBee generator,
the current and voltage fluctuation signal
Further: the control module consists of a digital controller, an A/D converter and a D/A converter, wherein,
the A/D converter is used for converting the received monitoring signal into a digital signal and transmitting the digital signal into the digital controller;
the digital controller is used for judging the fault type of the digital signal and transmitting the fault type into the D/A converter;
the D/A converter is used for converting the fault type into an electric signal and inputting the electric signal into the ZigBee generator.
Further: the interference module comprises a passive interference module and an active interference module, wherein,
the passive interference module comprises a power supply switching circuit and an overcurrent protection circuit;
the active interference module comprises a digital alarm, a picture processor and a camera, the digital alarm and the camera are both wirelessly connected with the picture processor through the ZigBee generator, wherein,
the picture processor is in wireless connection with the control module through the ZigBee generator, receives pictures shot by the camera, generates the environment monitoring signal, and judges whether the environment fault signal is output or not.
Further: the power supply switching module comprises a main power supply, a standby power supply, a comparator, a selector, a contactor, a first signal switch and a second signal switch,
the main power supply output end is electrically connected with the input end of the first signal switch and the first input end of the comparator;
the output end of the standby power supply is electrically connected with the reference voltage input end of the comparator and the normally open electric contact of the selector;
the output end of the comparator is electrically connected with the selection input end of the selector;
the first output end of the selector is electrically connected with the first signal switch through the contactor;
a second output of the selector is electrically connected to the second signal switch input, wherein,
and the input end of the second signal switch is also electrically connected with the output end of the normally open contact of the selector.
Further: the over-current protection circuit comprises a first resistor, a first triode, a second resistor, a third resistor, a fourth resistor, a voltage stabilizing diode and a capacitor, wherein,
the output end of the first resistor is electrically connected with the base electrode of the first triode and the collector electrode of the second triode, and the output end of the first resistor is also electrically connected with the output end of the comparator through a second resistor;
the first triode emission set is connected with the base electrode of the second triode;
the emission set of the second triode is electrically connected with the input end of the comparator, wherein,
a voltage stabilizing diode is further connected between the base electrode of the second triode and the second resistor, and a capacitor is further connected between the emission set of the second triode and the second resistor;
the reference voltage input end of the comparator is electrically connected with the main power supply output end, and the output end of the comparator is electrically connected with the first signal switch and the second signal switch.
A weak current control monitoring method based on the Internet of things comprises the following steps:
monitoring abnormal signals of environment and current and voltage, and converting the abnormal signals into monitoring signals;
converting the monitoring signal into a fault signal, wherein the fault signal comprises a circuit fault signal and an environmental fault signal;
and regulating and controlling the circuit fault signal by adopting passive interference, and regulating and controlling the environment fault signal by adopting active interference.
Further: the monitoring of the environment and the abnormal signals of the current and the voltage and the conversion of the abnormal signals into the monitoring signals comprise the following steps:
step 1: an environment abnormal signal output by the environment signal is set as Y, wherein k is 0, k is 1KThe following expression is obtained:
wherein, ckIs the amount of change in current, TkIs the variation of the resistance of the platinum resistor, vkIs the voltage magnitude of the input voltage;
step 2: the abnormal signal of the current and voltage is judged, the abnormal signal of the current and voltage is set as y, (y is 1, y is 0), and the abnormal signal output by the current and voltage signal is set as ykThe following expression is obtained:
wherein, wkIs the amount of change in waveform, ikIs the amount of change in current, vkIs the voltage magnitude of the input voltage;
and step 3: let the abnormal value be toOutputting an abnormal signal through abnormal value calculation;
wherein, when t isoWhen the value is more than 1, the abnormality is caused by the environment, an environment abnormal signal is output, and when t is greater than 1oWhen the voltage is less than 1, the abnormality is caused by the internal circuit voltage, and a current voltage abnormality signal is output when t isoWhen the current is equal to 1, the environment abnormal signal and the current are output simultaneouslyAbnormal voltage signal when toWhen 0, no abnormality occurs.
The invention has the beneficial effects that: the environmental condition of the weak current box and the current and voltage condition of the weak current can be monitored at any time, fault signals can be processed in time through a short-range communication technology, and the operation of the weak current box is protected. When environmental faults occur, the alarm is timely given to find operation and maintenance personnel for repair, and when current and voltage faults occur, the power supply is timely converted or the power is cut off through passive interference, so that the overcurrent phenomenon caused by current surge of the weak current box is prevented, and the switching equipment of the weak current box is prevented from being burnt. The voltage switching belongs to seamless switching, the time is fast, and the normal operation of the weak current box cannot be influenced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic composition diagram according to an embodiment of the present invention;
fig. 2 is a flowchart of a weak current control monitoring method based on the internet of things according to an embodiment of the present invention;
FIG. 3 is a temperature feedback circuit diagram according to an embodiment of the present invention;
FIG. 4 is a power switching circuit diagram according to an embodiment of the present invention;
FIG. 5 is an embodiment of an over-current protection circuit;
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, the present invention is a weak current control monitoring system based on internet of things, and the system comprises:
and the monitoring module is used for receiving a monitoring signal and transmitting the monitoring signal into the control module, wherein the monitoring signal comprises an environment monitoring signal and a current monitoring signal. The environmental monitoring signal is a fault signal based on surface existence, which is generated by natural environment, human factors and machine faults of the weak current box, such as whether a box body of the weak current box is damaged, water inflow of the weak current box, fire of the weak current box, dim flashing of a signal lamp in the weak current box and the like. The current signal monitoring mainly comprises current fluctuation, voltage fault and voltage fluctuation based on the current fluctuation, and the like, wherein the current voltage fluctuation fault is caused by a load end and a network end when the weak current box runs.
The control module is used for receiving the environment monitoring signal and the current monitoring signal, converting the received monitoring signal into a fault signal and transmitting the fault signal into the interference module, wherein the fault signal comprises a circuit fault signal and an environment fault signal; and the submodule is used for receiving the fault signal, judging which fault signal is, and sending the processing scheme of the fault signal to the interference module. If the signal is a signal requiring active interference, the alarm gives an alarm to call operation and maintenance personnel to remove the fault, and if the signal is a signal requiring passive interference, the passive interference module automatically processes the fault according to the circuit function.
And the interference module is used for receiving the fault signal, regulating and controlling the circuit fault signal by adopting passive interference and regulating and controlling the environment fault signal by adopting active interference.
The short-range communication module is used for carrying out wireless signal transmission among the monitoring module, the control module and the interference module, wherein the short-range communication module is formed by electrically connecting a plurality of ZigBee generators with the monitoring module, the control module and the interference module. The connection of each component is used for forming each module into a wireless network for short-range communication, and when a fault signal exists, the wireless network can process the fault signal in time.
The invention is based on the combination of the wireless communication technology of the Internet of things equipment, the circuit monitoring technology and the interference technology of a direct current circuit. According to the invention, the temperature condition and the environmental condition of the smart home equipment weak current box are monitored by the monitoring equipment. And the control module judges the received abnormal signal and processes the abnormal signal into a fault signal by feeding back the abnormal signal data in the electric signals of the temperature condition and the environmental condition to the control module. The interference module is used for active interference and passive interference, the active interference is mainly used for solving a fault in the weak current box environment, and operation and maintenance personnel are searched for carrying out fault treatment through alarming. For the fault signal of the current and the voltage, the power supply or the current protection circuit is automatically switched through the passive interference module, and the power supply is automatically switched based on the main circuit and the auxiliary circuit. The current protection is mainly carried out by opening two signal switches of the automatic switching power circuit and directly cutting off the two signal switches to carry out power-off protection.
The invention has the advantages that: the environmental condition of the weak current box and the current and voltage condition of the weak current can be monitored at any time, fault signals can be processed in time through a short-range communication technology, and the operation of the weak current box is protected. When environmental faults occur, the alarm is timely given to find operation and maintenance personnel for repair, and when current and voltage faults occur, the power supply is timely converted or the power is cut off through passive interference, so that the overcurrent phenomenon caused by current surge of the weak current box is prevented, and the switching equipment of the weak current box is prevented from being burnt. The voltage switching belongs to seamless switching, the time is fast, and the normal operation of the weak current box cannot be influenced.
As an embodiment of the present invention, a temperature feedback circuit diagram of the present invention is shown in fig. 3: the monitoring module of the invention consists of a temperature feedback circuit and a current-voltage transmitter connected in series with a weak current box, wherein,
the temperature feedback circuit is composed of a platinum resistor RG, a first direct-current power supply V1+, a second direct-current power supply VS, an operational amplifier A, a comparator G, a first resistor RT1, a second resistor RT2 and a third resistor RT3, wherein the first direct-current power supply V1+ is connected with the platinum resistor RG in series and connected with the inverting input end of the operational amplifier A, the output end of the operational amplifier A is connected with the second resistor RT2 in series and connected with the positive input end of the comparator G, and the output end of the comparator G is externally connected with the ZigBee generator.
The principle of the temperature feedback circuit is that through the principle that the resistance value of the platinum resistor RG changes due to the environmental temperature, a current signal of a first direct current power supply V1+ passes through the platinum resistor RG, the platinum resistor RG senses the temperature rise and the resistance value rises, and the operational amplifier A amplifies the current signal according to the proportion to obtain a current signal which can be contrastingly monitored. And comparing a second direct current power supply VS serving as a reference voltage with a signal processed by the operational amplifier A, judging the fluctuation range of the current and the voltage, and further judging the internal temperature condition of the weak current box.
The first direct current power supply V1+ is also electrically connected with the second resistor RT2 through a second capacitor CT2, the second capacitor CT2 is used as an energy storage device, the voltage of the first direct current power supply V1+ can be made uniform and smoothly transmitted to the voltage stabilizing diode DT1, the first direct current power supply V1+ is electrically connected with the output end of the comparator G directly to be used as the power supply of the ZigBee generator, and the voltage stabilizing diode DT1 is electrically connected with the input end of the comparator G.
The inverting input END of the operational amplifier a is electrically connected to a ground END, so as to reduce the signal-to-noise ratio of the power supply voltage, wherein a first capacitor CT1 is further connected between the non-inverting input END of the operational amplifier a and the ground END, and the capability of reducing the signal-to-noise ratio can be enhanced through the filtering effect of the first capacitor CT 1. The inverting input end of the operational amplifier is electrically connected with the output end of the operational amplifier A; the first resistor RT1 is connected between the non-inverting input end and the output end of the operational amplifier A, so that the current signal amplified by the operational amplifier A can be subjected to impedance matching, and the current signal entering the input end of the first comparator G is subjected to impedance matching because the first capacitor CT1 exists in the circuit, so that the output error of the first comparator G is prevented.
The third input end of the first comparator G is connected with the second direct current power supply VS, the second direct current power supply VS is further electrically connected with the output end of the comparator G, and the third resistor RT3 is further connected between the second direct current power supply VS and the output end of the comparator G; the second dc power VS is used as a reference voltage, which can be compared with the input voltage to determine the temperature variation according to the output current curve.
The negative input END of the first comparator G is connected to the ground END, wherein a fourth resistor RT4 is further connected between the negative input END of the first comparator G and the ground END. The internal space of the comparator is saved while the input and output of the first comparator G are stabilized.
As an example: the current voltage transducer of the monitoring module is used for receiving a power supply end current voltage fluctuation signal in a weak circuit and a temperature change signal of the temperature feedback circuit, inputting the signals into the ZigBee generator, and sending the signals to the control module by the ZigBee generator, wherein,
the current and voltage fluctuation signal is measured by the current and voltage transmitter and the power end of the weak current box.
The current-voltage transmitter monitors voltage and current fluctuation of the weak current box conversion equipment as a circuit signal through a weak current power supply connected with the weak current box; and the environment temperature of the weak current box is measured through the temperature feedback circuit, so that double monitoring of the temperature and the circuit is realized.
As an embodiment of the present invention: the control module consists of a digital controller, an A/D converter and a D/A converter, wherein,
the A/D converter is used for converting the received monitoring signal into a digital signal and transmitting the digital signal into the digital controller;
the digital controller is used for judging whether the environment fault signal or the circuit fault signal is the digital signal and transmitting the fault signal into the D/A converter;
the D/A converter is used for converting the fault type into an electric signal and inputting the electric signal into the ZigBee generator.
The control module adopts a process of converting an analog signal into a digital signal and then converting the digital signal into the analog signal, wherein the digital controller can classify an incoming electric signal into one of fault signals based on an internally stored reference parameter and then transmit the fault signals into the ZigBee generator.
And sending the data to a lower-layer interference module, and judging whether the problem is processed by active interference or passive interference by the interference module.
Has the advantages that: the fault signal is judged by the conversion of the electric signal and the digital signal, the requirement of data to be processed is low, and therefore, the product using the energy of the digital controller can be completed, and the structure is simple.
As an embodiment of the present invention: the interference module comprises a passive interference module and an active interference module, wherein,
the passive interference module comprises a power supply switching circuit and an overcurrent protection circuit, wherein the power supply switching circuit is electrically connected with the overcurrent protection circuit;
the active interference module comprises a digital alarm, a picture processor and a camera, the digital alarm and the camera are both wirelessly connected with the picture processor through the ZigBee generator, wherein,
the picture processor is in wireless connection with the control module through the ZigBee generator, receives pictures shot by the camera, generates the environment monitoring signal, and judges whether the environment fault signal is output or not.
The active interference module alarms based primarily on changes in the environmental signal. Meanwhile, the problem that the temperature is detected by the temperature feedback circuit belongs to the problem that a camera in the active interference module cannot be detected, and the environment monitoring is a multiple guarantee. And obtaining a picture by monitoring a signal and actively interfering. If environmental faults occur, the control module sends signals to the alarm, the alarm gives an alarm, and operation and maintenance personnel call fault pictures through the camera and actively process the fault pictures.
The design has the advantages that: can be when running into the peripheral environmental fault problem of weak current case, can report to the police through the initiative interference, the peripheral fortune dimension personnel of suggestion are maintained, and the picture of camera also can pass through picture treater and zigBee generator and send fortune dimension personnel to simultaneously, makes things convenient for fortune dimension personnel to maintain.
Fig. 4 is a power switching circuit diagram of an interference module according to an embodiment of the present invention, the power switching circuit includes a main power VM1+, a standby power VS1+, a second comparator G2, a selector S, a contactor KM1, a first signal switch KS1, and a second signal switch KS2,
the main power supply VM1+ output is electrically connected to an input of the first signal switch KS1 and a first input of a second comparator G2;
the output end of the standby power supply VS1+ is electrically connected with the reference voltage input end of the second comparator G2 and the normally open contact of the selector S;
the output end of the second comparator G2 is electrically connected with the selection input end of the selector S;
a first output terminal of the selector S is electrically connected with the first signal switch KS1 through the contactor KM 1;
a second output of the selector S is electrically connected to an input of the second signal switch KS2, wherein,
the input terminal of the second signal switch KS2 is also electrically connected to the output terminal of the normally open contact of the selector S.
The power supply switching is based on the comparison between a main power supply VM1+ and a standby power supply VS1+, wherein the standby power supply VS1+ is used as a reference power supply and outputs a stable level signal, when the voltage of the main power supply VM1+ is insufficient, the standby power supply VS1+ is used as the reference power supply and outputs an abnormal level signal, the output end of a second comparator G2 is connected with a normally closed selection point of a selector, the main power supply VM1+ is a set priority connection point, and a contactor KM1 receives the electric stable level signal and controls a first signal switch KS1 to be opened. When the second comparator G2 receives an abnormal level signal, the normally closed selection point is connected to the other normally closed and normally open selection point, the normally open contact of the selector S and the standby power supply VS1+ are closed, and the standby power supply VS1+ is turned on.
The beneficial effect of this scheme lies in: the main power supply and the standby power supply are switched through the change of the level signal, seamless switching is achieved, and the weak current box is prevented from being in a non-electricity state for a long time due to the power switching of the passive interference module.
As an embodiment of the present invention, as shown in fig. 5, an overcurrent protection circuit of an interference module of the present invention: the overcurrent protection circuit comprises a first resistor RC1, a first triode P1, a second triode P2, a second resistor RC2, a third comparator G3, a third resistor RC3, a fourth resistor RC4, a voltage stabilizing diode D2 and a filter capacitor CP, wherein,
the output end of the first resistor RC1 is electrically connected with the base of the first triode P1 and the collector of the second triode P2, and the output end of the first resistor RC1 is also electrically connected with the input end of the second triode P2 through a second resistor RC 2;
the first triode P1 emission set is connected with the base of the second triode P2;
the emitting set of the second transistor P2 is electrically connected to the input terminal of the third comparator G3, wherein,
a voltage stabilizing diode D2 is connected between the base electrode of the second triode P2 and the second resistor RC2, and a filter Capacitor (CP) is connected between the emission set of the second triode P2 and the second resistor RC 2;
the third comparator G3 has a reference voltage input electrically connected to the main power supply VM1+ output and an output electrically connected to the first signal switch KS1 and the second signal switch KS 2.
This scheme is enlargied the electric current through two triodes in proper order, obtains a stable amplified current, then the amplified current through comparing with main power supply VM1+, normally can normal operating when the circuit current, when the circuit current spills over, in time through first signal switch KS1 with second signal switch KS2 is with the power shutoff. And weak current equipment is prevented from being burnt out due to overcurrent.
Has the advantages that: the overcurrent protection circuit controls the on-off of the power supply of the weak current box, so that weak current equipment and the weak current box can be better protected from being burnt out or burning the weak current equipment due to current overflow.
As shown in fig. 2, the weak current control monitoring method based on the internet of things is characterized by comprising the following steps:
monitoring abnormal signals of environment and current and voltage, and converting the abnormal signals into monitoring signals;
converting the monitoring signal into a fault signal, wherein the fault signal comprises a circuit fault signal and an environmental fault signal;
and regulating and controlling the circuit fault signal by adopting passive interference, and regulating and controlling the environment fault signal by adopting active interference.
The method has the advantages that: the environmental condition of the weak current box and the current and voltage condition of the weak current can be monitored at any time, fault signals can be processed in time through a short-range communication technology, and the operation of the weak current box is protected. When environmental faults occur, the alarm is timely given to find operation and maintenance personnel for repair, and when current and voltage faults occur, the power supply is timely converted or the power is cut off through passive interference, so that the overcurrent phenomenon caused by current surge of the weak current box is prevented, and the switching equipment of the weak current box is prevented from being burnt. In addition, the voltage is seamlessly switched, the time is fast, and the normal operation of the weak current box is not influenced.
As an embodiment of the present invention: the monitoring of the environment and the abnormal signals of the current and the voltage and the conversion of the abnormal signals into the monitoring signals comprise the following steps:
step 1: an environment abnormal signal output by the environment signal is set as Y, wherein k is 0, k is 1KThe following expression is obtained:
wherein, ckIs the amount of change in current, TkIs the variation of the resistance of the platinum resistor, vkIs the voltage magnitude of the input voltage;
step 2: the abnormal signal of the current and the voltage is judged, the abnormal signal of the current and the voltage is set as y, and the abnormal signal output by the current and voltage signal is set as y (y is 1 and y is 0)kThe following expression is obtained:
wherein, wkIs the amount of change in waveform, ikIs the amount of change in current, vkIs the voltage magnitude of the input voltage;
and step 3: let the abnormal value be toOutputting an abnormal signal through abnormal value calculation;
wherein, when t isoWhen the value is more than 1, the abnormality is caused by the environment, an environment abnormal signal is output, and when t is greater than 1oWhen the voltage is less than 1, the abnormality is caused by the internal circuit voltage, and a current voltage abnormality signal is output when t isoWhen the current value is equal to 1, an environment abnormal signal and a current and voltage abnormal signal are simultaneously output, and when t is equal tooWhen 0, no abnormality occurs.
The principle of the embodiment is as follows: by the environmental monitoring signal, by ckAmount of change in current, TkVariation of resistance value of platinum resistor, vkA voltage amount of the input voltage; further, by calculating an abnormal value of the monitor signal, the obtained abnormal signal Y is judgedKWhether the signal is an abnormal signal;
by monitoring the current-voltage signal in the circuit, in variable, according to wkAmount of change in waveform, ikAmount of change in current, vkA voltage amount of the input voltage; further, by calculating an abnormal value of the monitor signal, the obtained abnormal signal y is judgedkWhether the signal is an abnormal signal;
the existence of abnormal signals can affect each other, but the probability of causing abnormality due to large abnormal value is also the largest. Therefore, it is possible to determine which abnormal signal is by the ratio of the abnormal value of the abnormal signal of the two signals.
The invention has the beneficial effects that: the abnormal value can be calculated, and finally the reason of the abnormal value is judged by comparison. Finally, the exception can be positioned, and the exception output by positioning can be processed preferentially.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a weak current control monitoring system based on thing networking which characterized in that includes:
the monitoring module is used for monitoring an environment and current and voltage abnormal signal, generating a monitoring signal and transmitting the monitoring signal to the control module, wherein the monitoring signal comprises an environment monitoring signal and a current and voltage monitoring signal;
the control module is used for receiving the environment monitoring signal and the current and voltage monitoring signal, converting the received monitoring signal into a fault signal and transmitting the fault signal to the interference module, wherein the fault signal comprises a circuit fault signal and an environment fault signal;
the interference module is used for receiving the fault signal, regulating and controlling the circuit fault signal by adopting passive interference and regulating and controlling the environment fault signal by adopting active interference;
the short-range communication module is used for configuring wireless signal transmission among the monitoring module, the control module and the interference module, wherein the short-range communication module is composed of a plurality of ZigBee generators, and the ZigBee generators are electrically connected with the monitoring module, the control module and the interference module.
2. The weak current control monitoring system based on the internet of things as claimed in claim 1, wherein: the monitoring module consists of a temperature feedback circuit and a current-voltage transmitter connected with a weak current box in series, the output end of the temperature feedback circuit is electrically connected with the current-voltage transmitter, wherein,
the temperature feedback circuit consists of a platinum Resistor (RG), a first direct current power supply (V1+), a second direct current power supply (VS), an operational amplifier (A), a comparator (G), a first resistor (RT1), a second resistor (RT2) and a third resistor (RT3), the first direct current power supply (V1+) is connected with the platinum Resistor (RG) in series and is connected with the inverting input end of the operational amplifier (A), the output end of the operational amplifier (A) is connected with the second resistor (RT2) in series and is connected with the positive input end of the comparator (G), and the output end of the comparator (G) is externally connected with the current-voltage transmitter, wherein,
the first direct current power supply (V1+) is also electrically connected with the second resistor (RT2) through a second capacitor (CT2) and is electrically connected with the input end of the comparator (G) through a voltage stabilizing diode (DT1), and the first direct current power supply (V1+) is directly electrically connected with the output end of the comparator (G);
the inverting input END of the operational amplifier (A) is electrically connected with a grounding END (END), a first capacitor (CT1) is further connected between the non-inverting input END of the operational amplifier (A) and the grounding END (END), and the inverting input END of the operational amplifier (A) is electrically connected with the output END of the operational amplifier (A); the first resistor (RT1) is connected between the non-inverting input end of the operational amplifier (A) and the output end of the operational amplifier (A);
the third input end of the comparator (G) is connected with the second direct current power supply (VS), the second direct current power supply (VS) is also electrically connected with the output end of the comparator (G), and the third resistor (RT3) is also connected between the second direct current power supply (VS) and the output end of the comparator (G);
the negative input END of the comparator (G) is connected with the grounding END (END), and a fourth resistor (RT4) is further connected between the negative input END of the comparator (G) and the grounding END (END).
3. The weak current control monitoring system based on the internet of things as claimed in claim 2, wherein:
the current voltage transducer of the monitoring module is used for receiving a power supply end current voltage fluctuation signal in a weak circuit and a temperature change signal of the temperature feedback circuit, inputting the signals into the ZigBee generator, and sending the signals to the control module by the ZigBee generator, wherein,
the current and voltage fluctuation signal is measured by the current and voltage transmitter and the power end of the weak current box.
4. The weak current control monitoring system based on the internet of things as claimed in claim 1, wherein: the control module consists of a digital controller, an A/D converter and a D/A converter, wherein,
the A/D converter is used for converting the received monitoring signal into a digital signal and transmitting the digital signal into the digital controller;
the digital controller is used for judging whether the digital signal is stored as a fault signal or not and transmitting the fault signal to the D/A converter;
and the D/A converter is used for converting the fault signal into an electric signal and inputting the electric signal into the ZigBee generator.
5. The weak current control monitoring system based on the internet of things as claimed in claim 1, wherein: the interference module comprises a passive interference module and an active interference module, the active interference module is electrically connected with the passive interference module, wherein,
the passive interference module comprises a power supply switching circuit and an overcurrent protection circuit, wherein the power supply switching circuit is electrically connected with the overcurrent protection circuit and the active interference module;
the active interference module comprises a digital alarm, a picture processor and a camera, the digital alarm and the camera are both wirelessly connected with the picture processor through the ZigBee generator, wherein,
the picture processor is in wireless connection with the control module through the ZigBee generator, receives pictures shot by the camera, generates the environment monitoring signal, and judges whether the environment fault signal is output or not.
6. The weak current control monitoring system based on the Internet of things of claim 5, wherein the power supply switching module comprises a main power supply (VM1+), a standby power supply (VS1+), a second comparator (G2), a selector (S), a contactor (KM1), a first signal switch (KS1) and a second signal switch (KS2), wherein,
the main power supply (VM1+) output is electrically connected to an input of the first signal switch (KS1) and to a first input of a second comparator (G2);
the output end of the standby power supply (VS1+) is electrically connected with the reference voltage input end of the second comparator (G2) and the normally open contact of the selector (S);
the output end of the second comparator (G2) is electrically connected with the selection input end of the selector (S);
a first output of the selector (S) is electrically connected to the first signal switch (KS1) via the contactor (KM 1);
a second output of said selector (S) is electrically connected to said second signal switch (KS2) input, wherein,
the input end of the second signal switch (KS2) is also electrically connected with the output end of the normally open contact of the selector (S).
7. The weak current control monitoring system based on the Internet of things of claim 6, wherein the over-current protection circuit comprises a first resistor (RC1), a first triode (P1), a second triode (P2), a second resistor (RC2), a third comparator (G3), a third resistor (RC3), a fourth resistor (RC4), a zener diode (D2) and a filter Capacitor (CP), wherein,
the output end of the first resistor (RC1) is electrically connected with the base of the first triode (P1) and the collector of the second triode (P2), and the output end of the first resistor (RC1) is also electrically connected with the input end of the second triode (P2) through a second resistor (RC 2);
the first triode (P1) emission set is connected with the base of the second triode (P2);
the emission set of the second triode (P2) is electrically connected with the input end of a third comparator (G3), wherein,
a voltage-stabilizing diode (D2) is connected between the base electrode of the second triode (P2) and the second resistor (RC2), and a filter Capacitor (CP) is connected between the emission set of the second triode (P2) and the second resistor (RC 2);
the third comparator (G3) reference voltage input is electrically connected to the main power supply (VM1+) output, and its output is electrically connected to the first signal switch (KS1) and the second signal switch (KS 2).
8. A weak current control monitoring method based on the Internet of things is characterized by comprising the following steps:
monitoring abnormal signals of environment and current and voltage, and converting the abnormal signals into monitoring signals;
converting the monitoring signal into a fault signal, wherein the fault signal comprises a circuit fault signal and an environmental fault signal;
and regulating and controlling the circuit fault signal by adopting passive interference, and regulating and controlling the environment fault signal by adopting active interference.
9. The weak current control monitoring method based on the internet of things as claimed in claim 8, wherein the step of monitoring the abnormal signals of the environment, the current and the voltage and converting the abnormal signals into the monitoring signals comprises the following steps:
step 1: an environment abnormal signal is judged, the environment signal is k, (k is 0, k is 1), and the environment abnormal signal output by the environment signal is YKThe following expression is obtained:
wherein, ckIs the amount of change in current, TkIs the variation of the resistance of the platinum resistor, vkIs the voltage magnitude of the input voltage;
step 2: the abnormal signal of the current and the voltage is judged, the abnormal signal of the current and the voltage is set as y, and the abnormal signal output by the current and voltage signal is set as y (y is 1 and y is 0)kThe following expression is obtained:
wherein, wkIs the amount of change in waveform, ikIs the amount of change in current, vkIs the voltage magnitude of the input voltage;
and step 3: let the abnormal value be toOutputting an abnormal signal through abnormal value calculation;
wherein, when t isoWhen the value is more than 1, the abnormality is caused by the environment, an environment abnormal signal is output, and when t is greater than 1oWhen the voltage is less than 1, the abnormality is caused by the internal circuit voltage, and a current voltage abnormality signal is output when t isoWhen the current value is equal to 1, an environment abnormal signal and a current and voltage abnormal signal are simultaneously output, and when t is equal tooWhen 0, no abnormality occurs.
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