Broken line monitoring circuit and monitoring method of intelligent terminal control loop

Abstract

The invention provides a broken line monitoring circuit and monitoring method for an intelligent terminal control loop, and the circuit comprises the steps: through the arrangement of a CPU control unit, a relay drive and broken line monitoring loop, a switching-on loop or / and a switching-off loop of a switch device, and a relay circuit, according to a waveform sequence outputted by the relay drive and broken line monitoring loop, a broken line monitoring loop is obtained; determining whether a closing loop or / and an opening loop of the switch equipment is / are disconnected, when the closing loop or / and the opening loop of the switch equipment is / are in a disconnected state, no matter what state the relay is in, the output waveform sequence of the relay driving and disconnection monitoring loop is always at a high level, and when the waveform sequence is a waveform or sine wave with a fixed frequency, the relay driving and disconnection monitoring loop outputs a disconnection state. And comparing the waveform sequence data with a preset data model to determine whether a closing loop or / and an opening loop of the switch equipment is / are disconnected. Complete monitoring of a control loop can be realized, and circuit setting is simple and easy to realize.

Description

Technical Field

[0001] The present invention belongs to the technical field related to monitoring of a terminal control loop, and in particular relates to a disconnection monitoring circuit and a monitoring method for a smart terminal control loop. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, the construction of a new type of power load management system has been fully launched to create a three-level load management system and fully apply a dedicated channel for load control. In the construction of the system, many intelligent terminals were installed on the load side of the system. The functions of the intelligent terminal, such as power setting control, electric energy control, remote control, and user flexible load control, are all output to the relay according to the preset rules after the intelligent terminal receives the corresponding command from the master station, and performs the corresponding control phase action. The control line is generally a 220V L line or N line connected to the opening circuit or closing circuit of the switch device through the output side of the relay. The control circuit is an important part of the power system. It can cut off the fault point in time when a power system fault occurs to protect equipment and personal safety. The most direct harm of the control circuit disconnection is that the switch cannot be opened and closed normally. When the control circuit is disconnected during opening, it means that the closing circuit is abnormal and the switch cannot be closed. When the control circuit is disconnected during closing, it means that the opening circuit is abnormal and the switch cannot be opened normally. How to monitor the disconnection of this control circuit is particularly important. The current method for this monitoring is to monitor the circuit status through the jump relay and closing relay of the switch device, and report it step by step.

[0004] However, the existing solutions have the following disadvantages:

[0005] 1. Most switchgear does not have communication function, and those without it cannot realize the function of line disconnection monitoring;

[0006] Second, the realization of communication function requires laying out communication cables or adding wireless communication modules, which is difficult to implement;

[0007] 3. There is a certain time delay when uploading via the communication function. Summary of the invention

[0008] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a line break monitoring circuit and monitoring method for a smart terminal control loop, which can realize complete monitoring of the control loop, improve the response time of the smart terminal to this fault, and can also monitor the status of the control loop locally when the smart terminal performs remote control. The circuit setting is simple and easy to implement.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a disconnection monitoring circuit for a control circuit of an intelligent terminal, comprising: a CPU control unit, a relay drive and disconnection monitoring circuit, a closing circuit and / or an opening circuit of a switch device, and a relay circuit, wherein:

[0011] The CPU control unit is connected to the second end of the relay drive and disconnection monitoring circuit and the first end of the relay circuit respectively;

[0012] The first end of the relay drive and disconnection monitoring circuit is connected to the second end of the relay circuit;

[0013] The third end of the relay circuit is connected to the closing circuit and / or the opening circuit of the switch device through a control line;

[0014] The CPU control unit is configured to determine whether the closing circuit and / or the opening circuit of the switching device are disconnected based on the collected waveform sequence output by the relay drive and disconnection monitoring circuit; when the waveform sequence is a high level, the closing circuit and / or the opening circuit of the switching device are in a disconnected state; if the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with a preset data model, it is determined whether the closing circuit and / or the opening circuit of the switching device are disconnected.

[0015] In a second aspect, the present invention provides a method for monitoring a line break of a control loop of an intelligent terminal, using a line break monitoring circuit of a control loop of an intelligent terminal as described above, comprising:

[0016] Acquire the waveform sequence output by the relay drive and disconnection monitoring circuit;

[0017] The waveform sequence is judged, and when the waveform sequence is at a high level, it is determined that the closing circuit and / or the opening circuit of the switch device is in a disconnected state;

[0018] If the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with the preset data model, it is determined whether the closing circuit and / or the opening circuit of the switching device are broken.

[0019] One or more of the above technical solutions have the following beneficial effects:

[0020] In the present invention, through the CPU control unit, the relay drive and disconnection monitoring circuit, the closing circuit or / and the opening circuit of the switch device, and the setting of the relay circuit, according to the waveform sequence output by the relay drive and the disconnection monitoring circuit, it is determined whether the closing circuit or / and the opening circuit of the switch device is disconnected. When the closing circuit or / and the opening circuit of the switch device is in a disconnected state, no matter what state the relay is in, the waveform sequence output by the relay drive and the disconnection monitoring circuit is always at a high level. When the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with the preset data model, it is determined whether the closing circuit or / and the opening circuit of the switch device is disconnected. The scheme of the present invention can realize the complete monitoring of the control circuit, improve the response time of the intelligent terminal to this fault, and can also monitor the status of the control circuit locally when the intelligent terminal performs remote control. The circuit setting is simple and easy to implement.

[0021] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 This is a schematic diagram of a line break monitoring circuit in Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of a disconnection monitoring module in Embodiment 1 of the present invention;

[0025] Figure 3 The relay circuit diagram in the first embodiment of the present invention;

[0026] Figure 4 The circuit diagram of the relay drive and disconnection monitoring circuit in the first embodiment of the present invention;

[0027] Figure 5 This is a flow chart of a line break monitoring method in Embodiment 1 of the present invention. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0030] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0031] Embodiment 1

[0032] This embodiment discloses a disconnection monitoring circuit of a smart terminal control circuit, comprising: a CPU control unit, a relay drive and disconnection monitoring circuit, a closing circuit and / or an opening circuit of a switch device, and a relay circuit, wherein:

[0033] The CPU control unit is connected to the second end of the relay drive and disconnection monitoring circuit and the first end of the relay circuit respectively;

[0034] A first end of the relay drive and disconnection monitoring loop is connected to a second end of the relay circuit;

[0035] The third end of the relay circuit is connected to the closing circuit and / or the opening circuit of the switch device through a control line;

[0036] A CPU control unit is configured to determine whether a closing circuit or / and an opening circuit of a switching device is disconnected based on a waveform sequence collected from an output of a relay drive and a disconnection monitoring circuit; when the waveform sequence is at a high level, the closing circuit or / and the opening circuit of the switching device is in a disconnected state; if the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with a preset data model, it is determined whether the closing circuit or / and the opening circuit of the switching device is disconnected.

[0037] like Figure 1 As shown, the line break monitoring circuit of the intelligent terminal control circuit proposed in this embodiment includes a CPU control unit, a relay drive and line break monitoring circuit, a relay circuit K and a closing circuit and / or an opening circuit of the switching device, and the L line is connected to the closing circuit and / or the opening circuit of the switching device via the relay circuit.

[0038] The CPU part can be combined with N-way relay driving and disconnection monitoring circuits and N-way relay circuits K to form a device with N-way control circuit disconnection monitoring.

[0039] In this embodiment, the intelligent terminal body structure has multiple module slots. According to the structure of the slots, the circuit break monitoring device composed of the CPU control unit, relay drive and line break monitoring circuit, and relay circuit can be designed into a corresponding structure, so that the line break monitoring device becomes a pluggable module on the terminal body.

[0040] There is a USB interface on the slot of the smart terminal body, and the CPU in the module communicates with the CPU of the smart terminal body through the USB interface. The module receives the control command sent by the smart terminal to perform relay action, and the closing and opening of the relay can control the closing and opening actions of the switch device.

[0041] The module's relay has the function of action preprocessing before action; and the output mode and pulse output width of the relay can be configured through parameters.

[0042] like Figure 2 As shown, the module also includes EEPROM, power circuit and output interface. The USB interface realizes the communication between the module and the intelligent terminal and provides power to the module. The USB interface is a standard interface on the intelligent terminal. The power circuit converts the power of the USB interface into power for the CPU, relay, EEPROM, etc. The CPU is the core component of the module and plays the role of disconnection monitoring data collection, preprocessing, feature extraction, and model building. The EEPROM stores the set parameters and disconnection event records.

[0043] Relay circuit such as Figure 3 As shown, it specifically includes: the first end of the resistor R13 is connected to 3P3V, the second end of the resistor R13 is connected to the first end of the second optocoupler U2, the second end GPO1 of the second optocoupler U2 is connected to the pin of the CPU, the fourth end of the second optocoupler U2 is connected to the anode of the diode D7 and the relay LS1, the cathode of the diode D7 is connected to the relay LS1, the pin 3 and the pin 2 of the relay LS1 are the output terminals DO1- and DO1+ of the relay LS1 respectively, and the output terminals DO1- and DO1+ of the relay LS1 are respectively connected to the output terminal J1.

[0044] Relay drive and disconnection monitoring circuit Figure 4As shown, the output terminal DO1+ of the relay LS1 is connected to R5 and R6 connected in series, the other end of R6 is connected to the midpoint of the bridge arm formed by D1 and D5, the output terminal DO1- of the relay LS1 is connected to R9 and R10 connected in series, the other end of R10 is connected to the midpoint of the bridge arm formed by D2 and D6; wherein, D1, D2, D5, and D6 form a full-wave rectifier bridge circuit; the cathode of D2 is connected to the cathode of the voltage-stabilizing diode D4, the anode of the voltage-stabilizing diode D4 is connected to the anode of D6, the anode and the cathode of the voltage-stabilizing diode D4 are connected to the first end and the second end of C2 respectively, the first end and the second end of C2 are connected to the first end of R3 and the first end of R12 respectively, the second end of R3 and the second end of R12 are connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the base of the transistor Q2, and the collector of the transistor Q3 is connected to the first end of R7 One end, the collector of transistor Q2 is connected to the first end of R7, the emitter of transistor Q2 is connected to the first end of C2, the base of transistor Q2 is connected to the base of transistor Q3 through R4, the second end of R7 is connected to the base of transistor Q4, the emitter of transistor Q4 is connected to the second end of C2, the emitter of transistor Q4 is also connected to the base of transistor Q4 through R11, the collector of transistor Q4 is connected to the second end of the first optocoupler U1 and the positive electrode of D3 respectively, the negative electrode of D3 is connected to the emitter of transistor Q2 through R1, the negative electrode of D3 is connected to C3 and R14 in sequence and then connected to the base of transistor Q3; the first end of the first optocoupler U1 is connected to the negative electrode of D3, the fourth end and the third end of the first optocoupler U1 are connected to the first end and the second end of C1 respectively, the first end of C1 is connected to the first end of R2, and the second end of R2 is connected to GP IN1.

[0045] Among them, the GPO1 end is connected to the CPU pin, and the relay is controlled by the high and low levels of the CPU pin. DO1+ and DO1- are the output ends of the relay, and J1 is the output terminal. D1, D2, D5, and D6 form a full-wave rectifier bridge circuit; R5, R6, R9, and R10 play a current limiting role; D4 is a voltage-stabilizing diode, which limits the voltage after rectification to a certain range; C2 is a uF-level capacitor, which is continuously charged and discharged with the rectified voltage; Q2, Q3, and Q4 are transistors, which follow the voltage at the C2 end and are continuously turned on and off; the first optical coupler U1 also follows the on and off of the transistors Q2, Q3, and Q4, and GP IN1 is connected to the ADC pin of the CPU end. The CPU collects analog signals through ADC and converts them into digital signals. After data collection, the CPU will perform preprocessing, and then feature extraction to form a preset data model.

[0046] When the relay terminal J1 connects the control line L, the GPIN1 terminal will have three data models according to the relay state. When the relay is not closed, the GPIN1 terminal will collect a waveform similar to the fixed frequency of charging and discharging the capacitor continuously; when the relay is closed, the GPIN1 terminal will collect a sine wave based on a certain level; when the control line loses power, no matter what the relay state is, the GPIN1 terminal will collect a high level.

[0047] like Figure 5 As shown, a separate process is established in the CPU program to collect data and execute commands from the intelligent terminal at all times. When the CPU does not receive a command, the data collected by the ADC is compared with the corresponding preset data model according to the current state of the relay.

[0048] The data of the local preset data model is stored in three forms. The first form is the analog-to-digital conversion value, namely the AD value, the second form is the signal amplitude value, and the third form is the signal phase value.

[0049] The data of the preset data model are sorted according to the one-to-one correspondence between the phase value and the amplitude value.

[0050] The length of the actual collected data is twice the data length of the preset data model. Performing FFT transformation on the actual collected data will obtain the amplitude and phase values ​​of the actual collected signal. The actual collected data will be sorted one by one according to the starting phase and corresponding amplitude in the preset data model. After sorting, the data with the same length as the data in the preset data model will be intercepted for comparison, and then the result will be obtained and sent to the smart terminal immediately. When the consistency of the collected data with the local corresponding preset model data reaches more than 90%, the current data status can be accurately determined.

[0051] It should be noted that because the phase of the AC signal is 0-360° cycle, if the first data in the preset data model sorting is 45°, the actual collected data starts from a phase of 45°, and the second data is also consistent with the actual model, and so on.

[0052] When the line disconnection monitoring module leaves the factory, three line disconnection states will be artificially created in the laboratory or production line. The monitoring module will store the collected data to form the most original preset data model.

[0053] When the disconnection monitoring module is applied to the actual use environment, the preset data model will be continuously revised according to the judgment results each time. The preset data model after each revision becomes the basis for the next judgment.

[0054] The preset data model is not static. When the disconnection monitoring module is installed in the actual use environment of the smart terminal, the smart terminal should compare each judgment of the disconnection monitoring module with the state of manual feedback and then feed back to the disconnection monitoring module.

[0055] The disconnection monitoring module compares the data of the preset data model with the actual collected data according to the feedback status. The data intercepted after sorting is compared with the preset data model using a local approximation network algorithm to correct the data of the preset data model. Specifically, the weighted value of the data intercepted after sorting is assigned to 1, and the initial weighted value of the data of the preset data model is N. Each time the preset data model is corrected, the weighted value becomes N+1, and then becomes M. The M value changes continuously with the number of corrections. The data correction method is M*original data+1*the sum of the values ​​intercepted after sorting divided by M+1.

[0056] Embodiment 2

[0057] The purpose of this embodiment is to provide a disconnection monitoring method for a control loop of an intelligent terminal, which adopts a disconnection monitoring circuit for a control loop of an intelligent terminal as in the first embodiment, including:

[0058] Acquire the waveform sequence output by the relay drive and disconnection monitoring circuit;

[0059] The waveform sequence is judged, and when the waveform sequence is at a high level, it is determined that the closing circuit and / or the opening circuit of the switch device is in a disconnected state;

[0060] If the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with the preset data model, it is determined whether the closing circuit and / or the opening circuit of the switching device are broken.

[0061] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0062] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A disconnection monitoring circuit for a smart terminal control loop, characterized in that: include: CPU control unit, relay drive and line break monitoring circuit, closing circuit and / or opening circuit of switchgear, and relay circuit, wherein: The CPU control unit is connected to the second end of the relay drive and disconnection monitoring circuit and the first end of the relay circuit respectively; The first end of the relay drive and disconnection monitoring circuit is connected to the second end of the relay circuit; The third end of the relay circuit is connected to the closing circuit and / or the opening circuit of the switch device through a control line; The CPU control unit is configured to determine whether the closing circuit and / or the opening circuit of the switching device are disconnected based on the collected waveform sequence output by the relay drive and disconnection monitoring circuit; when the waveform sequence is a high level, the closing circuit and / or the opening circuit of the switching device are in a disconnected state; if the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with a preset data model, it is determined whether the closing circuit and / or the opening circuit of the switching device are disconnected.

2. A disconnection monitoring circuit for a smart terminal control loop as claimed in claim 1, characterized in that: The CPU control unit is connected to the second end of the N-way relay control and monitoring loop and the first end of the N-way relay circuit to form N-way control loop monitoring; wherein N is a positive integer.

3. A disconnection monitoring circuit for a smart terminal control loop as claimed in claim 1, characterized in that: The CPU control unit is configured such that when it is determined that the waveform sequence output by the collected relay drive and disconnection monitoring circuit is a waveform of a fixed frequency, the relay circuit is in an unclosed state; and when it is determined that the waveform sequence output by the collected relay drive and disconnection monitoring circuit is a sine wave, the relay circuit is in a closed state.

4. A disconnection monitoring circuit for a smart terminal control loop as claimed in claim 1, characterized in that: The relay control and monitoring circuit includes a full-wave rectifier bridge circuit, a second capacitor, a transistor and a first optocoupler; the second capacitor continuously charges and discharges according to the state of the full-wave rectifier bridge circuit, and controls the on and off of the transistor, and the first optocoupler follows the on and off of the transistor to operate.

5. A disconnection monitoring circuit for a control loop of an intelligent terminal as claimed in claim 4, characterized in that: The second end of the relay circuit is connected to different bridge arms of the full-wave rectifier bridge circuit through the fifth resistor and the sixth resistor connected in series, and the ninth resistor and the tenth resistor connected in series, respectively. The output end of the full-wave rectifier bridge circuit is connected to the first end and the second end of the Zener diode, and the first end and the second end of the second capacitor, respectively.

6. A disconnection monitoring circuit for a control loop of an intelligent terminal as claimed in claim 5, characterized in that: The first end and the second end of the second capacitor are connected to the base of the third transistor through the third resistor and the twelfth resistor respectively, the emitter of the third transistor is connected to the base of the second transistor, the collector of the third transistor and the collector of the second transistor are connected to the base of the fourth transistor, the collector of the fourth transistor is connected to the first optocoupler, and the emitter of the fourth transistor is connected to the base of the third transistor.

7. A disconnection monitoring circuit for a smart terminal control loop as claimed in claim 1, characterized in that: The preset data model stores analog-to-digital conversion values, signal amplitude values, and signal phase values; wherein the signal amplitude values ​​and the signal phase values ​​are sorted in a one-to-one correspondence.

8. A disconnection monitoring circuit for a smart terminal control loop as claimed in claim 1 or 7, characterized in that: The CPU control unit is configured to: perform Fourier transform on the waveform sequence collected from the output of the relay drive and disconnection monitoring circuit to obtain the amplitude value and phase value of the actual collected signal; compare the amplitude value and phase value of the actual collected signal with the signal amplitude value and signal phase value in the preset model to determine whether the closing circuit and / or opening circuit of the switching device is disconnected.

9. A disconnection monitoring circuit for a control loop of an intelligent terminal as claimed in claim 8, characterized in that: The CPU control unit is configured to: sort the amplitude values ​​and phase values ​​of the actual collected signals one by one according to the amplitude corresponding to the starting phase of the preset model, and after sorting, intercept the data with the same length as that in the preset data model for comparison; if the consistent data exceeds the preset value, determine the state of the closing circuit and / or the opening circuit of the switching device according to the data state of the preset data model.

10. A method for monitoring disconnection of a control loop of an intelligent terminal, using a circuit for monitoring disconnection of a control loop of an intelligent terminal as claimed in any one of claims 1 to 9, characterized in that: include: Acquire the waveform sequence output by the relay drive and disconnection monitoring circuit; The waveform sequence is judged, and when the waveform sequence is at a high level, it is determined that the closing circuit and / or the opening circuit of the switch device is in a disconnected state; If the waveform sequence is a waveform of a fixed frequency or a sine wave, by comparing the size of the waveform sequence data with the preset data model, it is determined whether the closing circuit and / or the opening circuit of the switching device are broken.

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