An electricity meter anti-disassembly circuit based on a voltage monitor and a fragile anti-disassembly wire

Abstract

The utility model discloses a kind of based on voltage monitor and fragile anti-disassembly line's electric energy meter anti-disassembly circuit, including circuit board, further include anti-disassembly line, anti-disassembly detection module, signal processing module and main control module, the anti-disassembly line is arranged on circuit board in cross winding wiring mode, anti-disassembly detection module, signal processing module and main control module are mutually electrically connected between, the anti-disassembly line one end ground, the other end is connected with anti-disassembly detection module.The utility model constructs the required component of function less, effectively reduce production cost;There is no mechanical contact, there is no oxidation, wear problem;Strong adaptability, can be used with various models electric energy meter main control chip;Flexible installation, anti-disassembly line can be flexibly arranged in different positions according to actual needs.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, specifically an anti-tamper circuit for electricity meters based on a voltage monitor and a vulnerable anti-tamper wire. Background Technology

[0002] Electricity meter tamper-proof technology aims to solve a series of core problems caused by unauthorized opening, tampering, or damage to electricity meters. These technical problems are interconnected and together constitute the core challenges in electricity meter management and electricity marketing. Existing electricity meter tamper-proof technologies mainly have the following shortcomings: 1. Complex mechanical structure: such as hidden screws, special clips, etc., resulting in high manufacturing costs and inconvenient installation and maintenance.

[0003] 2. High cost of electronic solutions: If Hall sensors, accelerometers, etc. are used, multiple components are required, resulting in higher costs.

[0004] 3. Insufficient reliability: Microswitches are susceptible to vibration, and the contact points may oxidize, leading to failure.

[0005] 4. Easily bypassed: Attackers can use external means to simulate a normal state and bypass the protection in some cases.

[0006] Chinese patent CN107016304A discloses an anti-tampering device and method for electronic devices, but it requires the cooperation of magnets and sensors, which is costly and susceptible to interference from external magnetic fields.

[0007] Therefore, this utility model provides an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire to solve the above problems. Utility Model Content

[0008] (a) Technical problems to be solved This invention provides an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire, aiming to solve the problems mentioned in the background art.

[0009] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: A tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire includes a circuit board, a tamper-proof wire, a tamper-proof detection module, a signal processing module, and a main control module. The tamper-proof wire is arranged on the circuit board in a cross-wrap routing manner. The tamper-proof detection module, the signal processing module, and the main control module are electrically connected to each other. One end of the tamper-proof wire is grounded, and the other end is connected to the tamper-proof detection module.

[0010] As a preferred technical solution of this application, the anti-tamper wire is an enameled wire with a diameter of 0.06mm-0.1mm. The anti-tamper wire passes through the mounting hole of the circuit board and is arranged at the component position of the circuit board in a cross-wrap routing manner.

[0011] As a preferred technical solution of this application, the signal processing module is a voltage monitor, specifically a TPS3809 series chip, which monitors the continuity of the anti-tamper wire through detection pins.

[0012] As a preferred technical solution of this application, the anti-tamper detection module is a pull-up resistor connected between the power supply and the detection point. When the anti-tamper wire breaks, the voltage at the detection point is pulled up to the power supply voltage.

[0013] As a preferred technical solution of this application, the anti-tampering line is fixed by easily broken adhesive.

[0014] As a preferred technical solution of this application, the main control module is a main processor, which records the anti-tampering event to a non-volatile memory and performs device locking after receiving a trigger signal.

[0015] As a preferred technical solution of this application, the output pin of the voltage monitor is directly connected to the GPIO pin of the main processor, without the need for additional signal conditioning circuitry.

[0016] As a preferred technical solution of this application, it also includes a power module, which provides power to the tamper detection module.

[0017] (III) Beneficial Effects Simple structure and low cost: Fewer components are required to form the function, effectively reducing production costs; High reliability: No mechanical contacts, eliminating oxidation and wear issues; Highly resistant to evasion: The fragile tamper-evident thread, once broken, cannot be repaired, providing permanent evidence; Extremely low power consumption: The standby current of the entire circuit is less than 20μA, which has almost no impact on the power consumption of the energy meter; Highly adaptable: It can be used with the main control chips of various types of electricity meters; Flexible installation: The anti-tamper wires can be flexibly placed in different locations according to actual needs. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire. Figure 2 This is a circuit diagram of an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire. Figure 3This is a module framework diagram of an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figures 1-3 As shown, this utility model provides an anti-tamper circuit for an energy meter based on a voltage monitor and a vulnerable anti-tamper wire, including a circuit board 1, an anti-tamper wire 2, an anti-tamper detection module, a signal processing module, and a main control module. The anti-tamper wire 2 is arranged on the circuit board 1 in a cross-wrap wiring manner. The anti-tamper detection module, the signal processing module, and the main control module are electrically connected to each other. One end of the anti-tamper wire 2 is grounded, and the other end is connected to the anti-tamper detection module (detection point).

[0021] In this embodiment, the anti-tamper wire 2 is an enameled wire with a diameter of 0.06mm-0.1mm. The anti-tamper wire 2 passes through the mounting hole 11 of the circuit board 1 and is arranged in a cross-wrap routing manner at the component positions of the circuit board 1, such as around the positions of key components such as metering chips and memory chips.

[0022] In this embodiment, the signal processing module is a voltage monitor, specifically a TPS3809 series chip with an operating voltage range of 2V-6V and a static current of less than 10μA. It monitors the continuity of the anti-tamper wire 2 through its detection pin.

[0023] In this embodiment, the anti-tamper detection module is a pull-up resistor with a resistance of 100kΩ, connected between the power supply and the detection point. When the anti-tamper wire 2 breaks, it pulls the voltage at the detection point up to the power supply voltage.

[0024] In this embodiment, the anti-tampering line 2 is fixed with an easily breakable adhesive, such as UV adhesive, to form an easily breakable structure.

[0025] In this embodiment, the main control module is the main processor (MCU). After receiving the trigger signal, it records the anti-tampering event to the non-volatile memory and performs device locking.

[0026] In this embodiment, the output pin of the voltage monitor is directly connected to the GPIO pin of the main processor, without the need for additional signal conditioning circuitry.

[0027] In this embodiment, a power module is also included, which provides power to the tamper detection module.

[0028] The specific working principle is as follows: Normal state: When the electricity meter is intact and has not been disassembled, the anti-tamper wire 2 remains intact, the detection point is grounded through the anti-tamper wire 2, the voltage is close to 0V, the voltage monitor detects the low level, and outputs a normal signal to the MCU.

[0029] Tamper-proof trigger state: When someone attempts to disassemble the electricity meter, the tamper-proof wire 2 is broken, and the voltage at the detection point is pulled up to the power supply voltage through the pull-up resistor. The voltage monitor detects the level change and outputs a trigger signal to the MCU. After receiving the trigger signal, the MCU executes the preset safety policy, including recording the tamper-proof event and locking the metering function.

[0030] Status retention: Since the tamper-proof cable 2 cannot automatically recover once broken, the tamper-proof status will be maintained until authorized maintenance personnel replace the tamper-proof cable and reset the system.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire, comprising a circuit board, characterized in that: It also includes an anti-tamper wire, an anti-tamper detection module, a signal processing module, and a main control module. The anti-tamper wire is arranged on the circuit board in a cross-wrap routing manner. The anti-tamper detection module, the signal processing module, and the main control module are electrically connected to each other. One end of the anti-tamper wire is grounded, and the other end is connected to the anti-tamper detection module.

2. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire as described in claim 1, characterized in that: The anti-tamper wire uses enameled wire with a diameter of 0.06mm-0.1mm. The anti-tamper wire passes through the mounting holes of the circuit board and is arranged at the component positions of the circuit board in a cross-wrap routing manner.

3. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire as described in claim 1, characterized in that: The signal processing module is a voltage monitor, specifically a TPS3809 series chip, which monitors the continuity of the anti-tamper wire through its detection pins.

4. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire as described in claim 1, characterized in that: The anti-tamper detection module is a pull-up resistor connected between the power supply and the detection point. When the anti-tamper wire breaks, it pulls the voltage at the detection point up to the power supply voltage.

5. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire according to claim 1, characterized in that: The anti-tampering line is fixed with easily broken adhesive.

6. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire according to claim 1, characterized in that: The main control module is the main processor. After receiving the trigger signal, it records the anti-tampering event to the non-volatile memory and performs device locking.

7. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire according to claim 1, characterized in that: The output pin of the voltage monitor is directly connected to the GPIO pin of the main processor, eliminating the need for additional signal conditioning circuitry.

8. The tamper-proof circuit for an energy meter based on a voltage monitor and a vulnerable tamper-proof wire according to claim 1, characterized in that: It also includes a power module, which provides power to the tamper detection module.

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