Backflow cable anti-theft monitoring circuit and device

Abstract

The utility model relates to a backflow cable anti-theft monitoring circuit and device. The backflow cable anti-theft monitoring circuit comprises a main control circuit, a power supply circuit, a receiving sampling circuit and a signal generating circuit. The output end of the power supply circuit is respectively connected with the main control circuit, the communication circuit, the receiving sampling circuit and the signal generation circuit; the input end of the signal generation circuit is connected with the main control circuit, the output end of the signal generation circuit is connected with a transmitting magnetic ring, and the signal generation circuit is used for generating a first characteristic signal according to a signal generation instruction output by the main control circuit; the input end of the receiving sampling circuit is connected with the receiving magnetic ring, the output end of the receiving sampling circuit is connected with the main control circuit, and the receiving sampling circuit is used for detecting loop current and a second characteristic signal in the backflow cable through the receiving magnetic ring and sending the loop current and the second characteristic signal to the main control circuit; and the main control circuit is used for outputting a signal generation instruction to the signal generation circuit and judging whether the backflow cable is stolen or not according to the loop current and the second characteristic signal.

Description

Technical Field

[0001] This application relates to the field of cable anti-theft technology, and in particular to return cable anti-theft monitoring circuits and devices. Background Technology

[0002] As a crucial component of high-voltage cable grounding systems, the return cable is susceptible to damage from theft, cutting, or breakage, which can lead to cable instability and even accidents. Therefore, effective online monitoring of the return cable's status, timely alarm activation, and troubleshooting are essential for reducing the failure rate of operating high-voltage cables, minimizing asset losses, and ensuring the safe and stable operation of the power grid.

[0003] However, existing anti-theft technologies for return cables suffer from problems such as low identification accuracy, low reliability, and high power consumption. Therefore, there is a need for a device that can accurately identify when a return cable is stolen or damaged, thereby ensuring the safety and stability of the power grid operation. Utility Model Content

[0004] This application provides a return cable anti-theft monitoring circuit and device to at least solve the problem of low identification accuracy in existing return cable anti-theft technologies in related technologies.

[0005] In a first aspect, embodiments of this application provide a return cable anti-theft monitoring circuit, applied in a return cable anti-theft monitoring device comprising a receiving magnetic ring and a transmitting magnetic ring. The return cable anti-theft monitoring circuit includes a main control circuit, a power supply circuit, a receiving sampling circuit, and a signal generation circuit; wherein...

[0006] The output terminal of the power supply circuit is connected to the main control circuit, communication circuit, receiving and sampling circuit and signal generation circuit respectively, and is used to provide working voltage;

[0007] The input terminal of the signal generation circuit is connected to the main control circuit, and the output terminal is connected to the transmitting magnetic ring. It is used to generate a first characteristic signal according to the signal generation command output by the main control circuit, and to transmit the first characteristic signal to the return cable through the transmitting magnetic ring.

[0008] The input terminal of the receiving sampling circuit is connected to the receiving magnetic ring, and the output terminal is connected to the main control circuit. It is used to detect the loop current and the second characteristic signal in the return cable through the receiving magnetic ring, and send the loop current and the second characteristic signal to the main control circuit.

[0009] The main control circuit is used to output signal generation instructions to the signal generation circuit, and to determine whether the return cable has been stolen based on the loop current and the second characteristic signal.

[0010] In one embodiment, the receiving sampling circuit includes a first interface, a sampling unit, a first operational amplifier unit, and a second operational amplifier unit; wherein,

[0011] The sampling unit is connected to the receiving magnetic ring through the first interface. The sampling unit is used to collect the current in the return cable, obtain the sampled current, and convert it into a voltage signal.

[0012] The input terminal of the first operational amplifier unit is connected to the sampling circuit, and the output terminal is connected to the main control circuit. It is used to amplify the voltage signal to obtain the loop current and input it to the main control circuit.

[0013] The input terminal of the second operational amplifier unit is connected to the output terminal of the first operational amplifier unit, and the output terminal of the second operational amplifier unit is connected to the main control circuit. This is used to amplify the loop current to obtain the second characteristic signal and input it to the main control circuit.

[0014] In one embodiment, the first operational amplifier unit includes a first resistor, a second resistor, and a first operational amplifier, wherein,

[0015] The first resistor is connected between the sampling unit and the negative input terminal of the first operational amplifier; the second resistor is connected between the negative input terminal and the output terminal of the first operational amplifier; and a bias voltage is applied to the positive input terminal of the first operational amplifier.

[0016] The second operational amplifier unit includes a third resistor, a fourth resistor, and a second operational amplifier, wherein,

[0017] The third resistor is connected between the output terminal of the first operational amplifier unit and the positive input terminal of the second operational amplifier; the negative input terminal of the second operational amplifier is grounded; the fourth resistor is connected between the negative input terminal and the output terminal of the second operational amplifier; the output terminal of the second operational amplifier serves as the output terminal of the second operational amplifier unit.

[0018] In one embodiment, the signal generation circuit includes a switching unit, a driving unit, an H-bridge, and a second interface; wherein,

[0019] The input terminal of the switching unit is connected to the main control circuit, the driving unit is connected between the output terminal of the switching unit and the output terminal of the H-bridge, and the output terminal of the H-bridge is connected to the transmitting magnetic ring through the second interface;

[0020] The switching unit is used to turn on after receiving the signal generation instruction and output a drive signal; the driving unit drives the H-bridge to generate a first feature signal after receiving the drive signal.

[0021] In one embodiment, the switching unit includes a first MOSFET and a second MOSFET; wherein,

[0022] The gate of the first MOSFET is electrically connected to the output terminal of the main control circuit; the source of the first MOSFET is grounded; the drain of the first MOSFET, the source of the second MOSFET, and the gate of the second MOSFET are connected to a 12V voltage; the drain of the second MOSFET serves as the output terminal of the switching unit.

[0023] In one embodiment, the driving unit includes a first half-bridge driving chip and a second half-bridge driving chip; wherein,

[0024] The first half-bridge driver chip is connected between the switching unit and the first bridge arm of the H-bridge, and is used to drive the MOS transistor on the first bridge arm to switch on and off.

[0025] The second half-bridge driver chip is connected between the switching unit and the second bridge arm of the H-bridge, and is used to drive the MOS transistor on the second bridge arm to switch on and off.

[0026] In one embodiment, the return cable anti-theft monitoring circuit further includes a communication circuit, wherein,

[0027] The communication circuit is connected to the main control circuit, and the main control circuit uses the communication circuit to achieve data interaction with external devices.

[0028] In one embodiment, the return cable anti-theft monitoring circuit further includes a power detection circuit, and the power supply circuit includes a power supply battery; wherein,

[0029] The input terminal of the power detection circuit is electrically connected to the power supply battery, and the control terminal and output terminal of the power detection circuit are electrically connected to the main control circuit.

[0030] When the power detection circuit receives the battery detection command from the main control circuit, it samples the voltage of the power supply battery and feeds back the collected voltage value to the main control circuit.

[0031] Secondly, embodiments of this application provide a device including an anti-theft host, a transmitting magnetic ring, and a receiving magnetic ring, wherein the anti-theft host includes the return cable anti-theft monitoring circuit described in any of the above embodiments;

[0032] The transmitting magnetic ring is connected to the output terminal of the signal generation circuit; the receiving magnetic ring is connected to the receiving sampling circuit.

[0033] The transmitting and receiving magnetic rings adopt a HALF structure and are secured to the return cable.

[0034] The return cable anti-theft monitoring circuit and device provided in this application embodiment have at least the following technical effects:

[0035] The return cable anti-theft monitoring circuit and device provided in this application are based on electromagnetic coupling technology, which monitors the on / off status of the return cable circuit in real time, realizes real-time monitoring of return cable disconnection, and has the advantages of accurate identification, high reliability and low power consumption mode. By directly reading the anti-theft signal, it ensures that the return cable can be identified and the alarm mechanism can be triggered when it is stolen or damaged, thereby ensuring the safety and stability of the power grid operation.

[0036] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 This is a structural block diagram of the return cable anti-theft monitoring circuit in one embodiment of this application;

[0039] Figure 2 This is a structural block diagram of the receiving sampling circuit in one embodiment of this application;

[0040] Figure 3 This is a structural block diagram of a signal generation circuit in one embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the structure of the return cable anti-theft monitoring device in one embodiment of this application. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0043] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0045] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0046] In one embodiment of this application, a return cable anti-theft monitoring circuit is provided, as detailed in the following reference. Figure 1This circuit is used in a return cable anti-theft monitoring device that includes a receiving magnetic ring and a transmitting magnetic ring. The return cable anti-theft monitoring circuit includes a main control circuit, a power supply circuit, a receiving sampling circuit, and a signal generation circuit.

[0047] The power supply circuit is connected to the main control circuit, the communication circuit, the receiving sampling circuit, and the signal generation circuit to provide operating voltage. The signal generation circuit is connected to the main control circuit at its input and to the transmitting magnetic ring at its output. It generates a first characteristic signal according to the signal generation command output by the main control circuit and transmits the first characteristic signal to the return cable through the transmitting magnetic ring. The receiving sampling circuit is connected to the receiving magnetic ring at its input and to the main control circuit at its output. It detects the loop current and the second characteristic signal in the return cable through the receiving magnetic ring and sends the loop current and the second characteristic signal to the main control circuit.

[0048] In this embodiment, the return cable anti-theft monitoring circuit further includes a communication circuit, which is connected to the main control circuit. The main control circuit interacts with external devices via the communication circuit. Preferably, the return cable anti-theft monitoring circuit of this application also includes a Bluetooth interface and a screen interface, enabling the anti-theft device to interact with other Bluetooth devices via Bluetooth communication technology, and to send monitoring data to a display device via the screen interface, thereby presenting the monitoring data to the user.

[0049] The main control circuit outputs signal generation instructions to the signal generation circuit and determines whether the return cable has been stolen based on the loop current and the second characteristic signal. For example, if the second characteristic signal and loop current are not received, or the value of the loop current is not within a preset range, or the second characteristic signal does not match the first characteristic signal, the return cable is determined to have been stolen. The main control circuit then issues an alarm signal and reports the alarm information to the corresponding platform via the communication circuit so that the user is aware. In this embodiment, the main control circuit includes a main control chip, which can be an STM32 microcontroller.

[0050] In one specific embodiment, reference is made to Figure 2The receiving sampling circuit of this embodiment includes a first interface, a sampling unit, a first operational amplifier unit, and a second operational amplifier unit. The sampling unit is connected to a receiving magnetic ring through the first interface. The sampling unit is used to collect the current in the return cable, obtain the sampled current, and convert it into a voltage signal. The input terminal of the first operational amplifier unit is connected to the sampling circuit, and its output terminal is connected to the main control circuit. It is used to amplify the voltage signal to obtain the loop current and input it to the main control circuit. The input terminal of the second operational amplifier unit is connected to the output terminal of the first operational amplifier unit, and its output terminal is connected to the main control circuit. It is used to amplify the loop current to obtain the second characteristic signal and input it to the main control circuit.

[0051] Specifically, refer to Figure 3 The signal generation circuit includes a switching unit, a driving unit, an H-bridge, and a second interface. The input terminal of the switching unit is connected to the main control circuit. The driving unit and the rectifier unit are respectively connected between the output terminal of the switching unit and the output terminal of the H-bridge. The output terminal of the H-bridge is connected to the transmitting magnetic ring through the second interface. The switching unit is used to turn on after receiving the signal generation command and output a driving signal. The driving unit, after receiving the driving signal, drives the H-bridge to generate a first characteristic signal.

[0052] In this embodiment, when monitoring of the return cable is not required, the main control circuit issues a corresponding command to disconnect the switching unit, and the H-bridge stops generating the first characteristic signal. Simultaneously, the main control circuit can also control the power supply circuit to stop supplying power to circuits other than the main control chip, thereby putting the anti-theft circuit into a low-power standby mode, reducing power consumption and extending the lifespan of the anti-theft device. When anti-theft monitoring is required, the switching unit is turned on, thus activating the anti-theft device.

[0053] In this embodiment, the switching unit includes a first MOSFET and a second MOSFET; wherein the gate of the first MOSFET is electrically connected to the output terminal of the main control circuit; the source of the first MOSFET is grounded; the drain of the first MOSFET, the source of the second MOSFET, and the gate of the second MOSFET are connected to a 12V voltage; the drain of the second MOSFET serves as the output terminal of the switching unit. When the switching unit receives a signal generation command from the main control chip, it outputs a drive signal, which drives the H-bridge to generate a first characteristic signal, and sends the first characteristic signal to the transmitting magnetic ring through the second interface, which then sends the first characteristic signal to the return cable.

[0054] The driving unit includes a first half-bridge driver chip and a second half-bridge driver chip. The first half-bridge driver chip is connected between the switching unit and the first arm of the H-bridge, and is used to drive the switching of the MOSFETs on the first arm. The second half-bridge driver chip is connected between the switching unit and the second arm of the H-bridge, and is used to drive the switching of the MOSFETs on the second arm. In this embodiment, the driver chip can be an IR2101STRPBF driver, which has independent high-voltage and low-voltage side reference output channels.

[0055] In this embodiment, the sampling unit includes a sampling resistor to acquire current signals or characteristic signals in the return cable. The first operational amplifier unit includes a first resistor, a second resistor, and a first operational amplifier. The first resistor is connected between the sampling unit and the negative input terminal of the first operational amplifier; the second resistor is connected between the negative input terminal and the output terminal of the first operational amplifier; and a bias voltage is applied to the positive input terminal of the first operational amplifier.

[0056] The second operational amplifier unit includes a third resistor, a fourth resistor, and a second operational amplifier, wherein: the third resistor is connected between the output terminal of the first operational amplifier unit and the positive input terminal of the second operational amplifier; the negative input terminal of the second operational amplifier is grounded; the fourth resistor is connected between the negative input terminal and the output terminal of the second operational amplifier; and the output terminal of the second operational amplifier serves as the output terminal of the second operational amplifier unit.

[0057] The sampling unit provided in this embodiment, after acquiring the current of the return cable and converting it into a voltage signal, inputs this voltage signal to a first operational amplifier. After processing by the operational amplifier, a loop current signal is obtained and output to the main control chip. Simultaneously, this loop current signal is input to a second operational amplifier. After further processing by the second operational amplifier, a second characteristic signal corresponding to the first characteristic signal is obtained, and then the second characteristic signal is sent to the main control chip. The main control chip determines whether the return cable has been stolen, damaged, or has other problems based on the received loop current and second characteristic signals. In this embodiment, the bias voltage can be set to 0.825V.

[0058] In summary, the return cable anti-theft monitoring circuit provided in this application has the following advantages:

[0059] (1) High-precision identification: Adopting advanced electromagnetic coupling technology, it can accurately distinguish between anti-theft signals and power frequency signals, ensuring the accuracy of alarms;

[0060] (2) Low power mode: The anti-theft monitoring device supports switching between low power mode and working mode to reduce power consumption. It can monitor the status of the return cable and trigger the alarm mechanism.

[0061] (3) High reliability: The transmitting and receiving magnetic rings are easy to install and have a stable structure, which can adapt to various harsh environments and ensure the long-term stable operation of the system.

[0062] Secondly, one embodiment of this application provides a return cable anti-theft monitoring device, including an anti-theft host, a transmitting magnetic ring, and a receiving magnetic ring. The anti-theft host includes the return cable anti-theft monitoring circuit described in any of the above embodiments. The transmitting magnetic ring is connected to the output terminal of the signal generation circuit; the receiving magnetic ring is connected to the receiving sampling circuit; the transmitting magnetic ring and the receiving magnetic ring adopt a HALF structure and are sleeved on the return cable. For specific structural details, refer to... Figure 4 .

[0063] It should be noted that the return cable anti-theft monitoring device provided in this embodiment is used to implement the above-described embodiments, and details already described will not be repeated. As used above, terms such as "module," "unit," and "subunit" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the above embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A return cable anti-theft monitoring circuit, characterized in that, In a return cable anti-theft monitoring device comprising a receiving magnetic ring and a transmitting magnetic ring, the return cable anti-theft monitoring circuit includes a main control circuit, a power supply circuit, a receiving sampling circuit, and a signal generation circuit; wherein, The output terminal of the power supply circuit is connected to the main control circuit, communication circuit, receiving and sampling circuit and signal generation circuit respectively, and is used to provide working voltage; The input terminal of the signal generation circuit is connected to the main control circuit, and the output terminal is connected to the transmitting magnetic ring. It is used to generate a first characteristic signal according to the signal generation command output by the main control circuit, and to transmit the first characteristic signal to the return cable through the transmitting magnetic ring. The input terminal of the receiving sampling circuit is connected to the receiving magnetic ring, and the output terminal is connected to the main control circuit. It is used to detect the loop current and the second characteristic signal in the return cable through the receiving magnetic ring, and send the loop current and the second characteristic signal to the main control circuit. The main control circuit is used to output signal generation instructions to the signal generation circuit, and to determine whether the return cable has been stolen based on the loop current and the second characteristic signal.

2. The anti-theft monitoring circuit for return cables according to claim 1, characterized in that, The receiving sampling circuit includes a first interface, a sampling unit, a first operational amplifier unit, and a second operational amplifier unit; wherein... The sampling unit is connected to the receiving magnetic ring through the first interface. The sampling unit is used to collect the current in the return cable, obtain the sampled current, and convert it into a voltage signal. The input terminal of the first operational amplifier unit is connected to the sampling circuit, and the output terminal is connected to the main control circuit. It is used to amplify the voltage signal to obtain the loop current and input it to the main control circuit. The input terminal of the second operational amplifier unit is connected to the output terminal of the first operational amplifier unit, and the output terminal of the second operational amplifier unit is connected to the main control circuit. This is used to amplify the loop current to obtain the second characteristic signal and input it to the main control circuit.

3. The return cable anti-theft monitoring circuit according to claim 2, characterized in that, The first operational amplifier unit includes a first resistor, a second resistor, and a first operational amplifier, wherein, The first resistor is connected between the sampling unit and the negative input terminal of the first operational amplifier; the second resistor is connected between the negative input terminal and the output terminal of the first operational amplifier; and a bias voltage is applied to the positive input terminal of the first operational amplifier.

4. The return cable anti-theft monitoring circuit according to claim 2, characterized in that, The second operational amplifier unit includes a third resistor, a fourth resistor, and a second operational amplifier, wherein, The third resistor is connected between the output terminal of the first operational amplifier unit and the positive input terminal of the second operational amplifier; the negative input terminal of the second operational amplifier is grounded; the fourth resistor is connected between the negative input terminal and the output terminal of the second operational amplifier; the output terminal of the second operational amplifier serves as the output terminal of the second operational amplifier unit.

5. The return cable anti-theft monitoring circuit according to claim 1, characterized in that, The signal generation circuit includes a switching unit, a driving unit, an H-bridge, and a second interface; wherein... The input terminal of the switching unit is connected to the main control circuit, the driving unit is connected between the output terminal of the switching unit and the output terminal of the H-bridge, and the output terminal of the H-bridge is connected to the transmitting magnetic ring through the second interface; The switching unit is used to turn on after receiving the signal generation instruction and output a drive signal; the driving unit drives the H-bridge to generate a first feature signal after receiving the drive signal.

6. The return cable anti-theft monitoring circuit according to claim 5, characterized in that, The switching unit includes a first MOSFET and a second MOSFET; wherein... The gate of the first MOSFET is electrically connected to the output terminal of the main control circuit; the source of the first MOSFET is grounded; the drain of the first MOSFET, the source of the second MOSFET, and the gate of the second MOSFET are connected to a 12V voltage; the drain of the second MOSFET serves as the output terminal of the switching unit.

7. The return cable anti-theft monitoring circuit according to claim 5, characterized in that, The driving unit includes a first half-bridge driving chip and a second half-bridge driving chip; wherein... The first half-bridge driver chip is connected between the switching unit and the first bridge arm of the H-bridge, and is used to drive the MOS transistor on the first bridge arm to switch on and off. The second half-bridge driver chip is connected between the switching unit and the second bridge arm of the H-bridge, and is used to drive the MOS transistor on the second bridge arm to switch on and off.

8. The anti-theft monitoring circuit for return cables according to claim 1, characterized in that, The return cable anti-theft monitoring circuit also includes a communication circuit, wherein... The communication circuit is connected to the main control circuit, and the main control circuit uses the communication circuit to achieve data interaction with external devices.

9. The anti-theft monitoring circuit for return cables according to claim 1, characterized in that, The return cable anti-theft monitoring circuit also includes a power detection circuit, and the power supply circuit includes a power supply battery; wherein... The input terminal of the power detection circuit is electrically connected to the power supply battery, and the control terminal and output terminal of the power detection circuit are electrically connected to the main control circuit. When the power detection circuit receives the battery detection command from the main control circuit, it samples the voltage of the power supply battery and feeds back the collected voltage value to the main control circuit.

10. A return cable anti-theft monitoring device, characterized in that, It includes an anti-theft host, a transmitting magnetic ring, and a receiving magnetic ring, wherein the anti-theft host includes the return cable anti-theft monitoring circuit as described in any one of claims 1-9; The transmitting magnetic ring is connected to the output terminal of the signal generation circuit; the receiving magnetic ring is connected to the receiving sampling circuit. The transmitting and receiving magnetic rings adopt a HALF structure and are secured to the return cable.

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