Intelligent electric meter and intelligent control system thereof

Abstract

The invention discloses an intelligent electric meter and an intelligent control system thereof. An intelligent control system of an intelligent electric meter comprises a power supply conversion module used for carrying out secondary voltage drop on a power supply; the microcontroller module is electrically connected with the power supply conversion module; a voltage measurement module; a current measurement module; and the electromagnet driving module is electrically connected with the microcontroller module, supplies power through the power supply conversion module, and is used for driving an electromagnet to disconnect a circuit when the electricity stealing behavior is detected. The intelligent electric meter comprises the intelligent control system. The intelligent control system has the following beneficial effects that the intelligent control system can cut off a power supply in time when finding an electricity stealing behavior, so that an illegal electricity utilization behavior is fundamentally prevented, illegal loss of electric energy is reduced, and the power management efficiency is improved. The intelligent control system is applied to the intelligent electric meter, a power supply is cut off in time when an electricity stealing behavior is found, and a manager can quickly perceive the electricity stealing behavior by observing the intelligent electric meter.

Description

Technical Field

[0001] The invention relates to an intelligent electric meter and an intelligent control system thereof. Background Art

[0002] As an indispensable terminal metering device in modern power systems, smart meters have been widely used in industrial and civil power supply systems. With the rapid development of Internet of Things technology and intelligent technology, smart meters not only have the basic metering functions of traditional meters, but also realize remote data transmission, power consumption behavior analysis, load management and other intelligent functions. At present, smart meters have developed a variety of models to meet the needs of power consumption measurement and management in different scenarios.

[0003] In actual applications, smart meters can collect power consumption data in real time through built-in microprocessors and communication modules, and transmit these data to the power management system. These data include not only basic power consumption information, but also multiple electrical parameters such as voltage, current, and power factor. Through the analysis of these data, the power supply department can realize functions such as power consumption behavior monitoring, load forecasting, and automatic electricity bill settlement, which greatly improves the efficiency and accuracy of power management.

[0004] However, illegal electricity theft is still a serious problem in the process of electricity use. Although existing smart meters already have the function of detecting electricity theft, they can identify possible electricity theft by analyzing abnormal electricity usage data and push alarm information to relevant managers through mobile devices, but this passive alarm mechanism has obvious limitations.

[0005] The first problem is that when smart meters detect electricity theft and sound an alarm, these alarm messages are often sent to managers via text messages or APP push notifications. However, in reality, managers may fail to notice these alarm messages in time for various reasons (such as resting at night, being busy at work, or having their phones muted). This delayed response allows electricity theft to continue, resulting in illegal consumption of a large amount of electricity.

[0006] What is more serious is that during the electricity theft, the smart meter will continue to record abnormal electricity consumption, which not only wastes electricity resources, but may also cause damage to the internal components of the meter due to long-term overload. At the same time, continuous electricity theft will also affect the power supply quality of the power grid and have adverse effects on other normal users.

[0007] In addition, the existing smart meters still keep the power supply on after discovering the theft of electricity, which actually provides the thief with an opportunity to continue to break the law. This passive monitoring method not only fails to effectively curb the theft of electricity, but also increases the economic losses and management costs of power companies.

[0008] Therefore, it is of great significance to develop a smart meter system that can actively respond to electricity theft. Such a system should not rely solely on manual intervention, but should have active protection functions such as automatic power off, which can cut off the power supply in time when electricity theft is detected, thereby fundamentally preventing the occurrence of illegal electricity use and protecting power resources and equipment safety. This can not only effectively prevent power loss, but also improve the automation level and response efficiency of power management.

[0009] As for electricity theft, it is not enough to only control the opening and closing of the circuit breaker by intelligent control. When the family members find that the circuit breaker is disconnected, they are likely to turn the circuit breaker again to reset it. For managers who do not often use mobile devices to remind, they are likely to think that it is a circuit breaker failure problem. It is necessary to analyze the load curve, detect the current phase, detect the power factor, etc. at the technical level, and only after a long period of investigation can the problem of electricity theft be discovered. Therefore, it is necessary to develop a smart meter that can disconnect the access circuit after discovering electricity theft, and cannot be opened and closed normally by the circuit breaker. This can first eliminate the problem of the circuit breaker and remind managers that they can quickly discover the problem by observing the situation of the smart meter. Summary of the invention

[0010] One of the purposes of the present invention is to provide an intelligent control system for a smart meter, which can cut off the power supply in time when electricity theft is discovered, fundamentally prevent illegal electricity use, reduce illegal electricity loss, and improve power management efficiency.

[0011] The above technical objectives of the present invention are achieved through the following technical solutions: An intelligent control system for an intelligent electric meter comprises: a power conversion module for performing a secondary voltage drop on a power source; a microcontroller module electrically connected to the power conversion module for controlling the input, operation and output of the system; a voltage measurement module for measuring input voltage and transmitting the signal to the microcontroller module; a current measurement module for measuring input current and transmitting the signal to the microcontroller module; and an electromagnet drive module electrically connected to the microcontroller module and powered by the power conversion module for driving an electromagnet to disconnect a circuit when electricity theft is detected.

[0012] The present invention is further configured as follows: the power conversion module includes: a first conversion circuit, used to convert a 12V voltage into a 3.6V voltage; the first conversion circuit includes a power switch chip, a fuse, an input filter capacitor, a control chip, an inductor and an output filter capacitor; used to power the electromagnet drive module; a second conversion circuit, used to convert a 3.6V voltage into a 3.3V voltage; the second conversion circuit includes a voltage stabilizing chip, an input filter capacitor, a pull-up resistor and an output filter capacitor, used to power the microcontroller module.

[0013] The present invention is further configured as follows: the voltage measurement module includes: a voltage-dividing resistor network, used to reduce the input voltage to a safe level; a voltage-stabilizing diode, used to prevent the voltage at the voltage-dividing point from exceeding a preset value; and a filter capacitor, used to filter out high-frequency noise of the input signal.

[0014] The present invention is further configured as follows: the current measurement module includes: a shunt resistor for generating a voltage drop proportional to the current; a sampling resistor for transmitting the voltage signal on the shunt resistor to the microcontroller module; a protection diode for preventing excessive voltage; and a filter capacitor for suppressing high-frequency noise in the sampling signal.

[0015] The second object of the present invention is to provide a smart meter that uses the above-mentioned intelligent control system to cut off the power supply in time when electricity theft is found, and enables management personnel to quickly detect electricity theft by observing the smart meter.

[0016] The above technical objectives of the present invention are achieved through the following technical solutions: A smart electric meter comprises: the above-mentioned smart control system; a shell, in which a wiring area and a chip area are arranged; a cover body, which is detachably connected to the shell; an electromagnet driving device, which is arranged in the wiring area and is used to disconnect the circuit when electricity theft is detected; a terminal, which is arranged in the wiring area and includes a metal material arranged on the lower side and a rubber material arranged on the upper side; the electromagnet driving device comprises: a wire loop, which slides between the metal material sleeved on the terminal and the rubber material; a positioning column, in which a magnetic material is arranged at the bottom and is connected to the wire loop; an electromagnet, which is arranged below the positioning column; the positioning column is initially adsorbed with the electromagnet, and when the electromagnet is energized, the electromagnet generates a repulsive force to make the positioning column stay away from the electromagnet, so that the wire loop is transformed from being connected to the metal material to being insulated from the rubber material.

[0017] The present invention is further configured as follows: a spring is provided between the wire loop, the positioning column and the wiring area, and the spring is used to keep the wire loop in a suspended state for easy observation.

[0018] The present invention is further configured such that the electromagnetic poles of the electromagnet are the same as the magnetic poles of the magnetic material at the bottom of the positioning column, and repel each other.

[0019] The present invention is further configured as follows: the smart meter is also provided with a display screen for observing the electric quantity reading and status.

[0020] In summary, the present invention has the following beneficial effects: The smart meter and its smart control system of the present invention have the following beneficial effects: through the design of the electromagnet drive module, the power supply can be cut off immediately when the electricity theft is detected, fundamentally preventing the illegal electricity use from continuing, and no longer relying solely on manual intervention. A two-stage power conversion structure (12V-3.6V-3.3V) is adopted, and a special filter circuit and voltage stabilization circuit are equipped to ensure the stability of the system power supply and effectively prevent voltage fluctuations from damaging sensitive components such as microcontrollers. The electromagnet drive module is powered by the intermediate state after a voltage drop, which increases the working voltage and reduces heat generation.

[0021] The spring connection design between the wire loop and the positioning column realizes the up and down floating function of the wire loop. The structure of the metal material coated with rubber material used in the terminal not only enhances the flexibility and reliability of the wiring, but also improves the insulation performance. Due to the special design of the electromagnet drive device, the circuit breaker cannot be reset normally after the power is off, which effectively prevents the repeated occurrence of electricity theft. Managers can quickly determine whether there is electricity theft by observing the appearance of the smart meter without complex technical detection. The system integrates functions such as voltage measurement, current measurement, data processing, communication and control, and ensures system safety through the application of devices such as fuses and voltage regulator diodes. It effectively reduces the illegal loss of power resources, reduces economic losses and power management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the flow chart of the intelligent control system; Figure 2 This is the 12V-3.6V conversion circuit diagram in the power conversion module; Figure 3 This is the 3.6V-3.3V conversion circuit diagram in the power conversion module; Figure 4 is the circuit diagram of the microcontroller module; Figure 5 is the circuit diagram of the voltage measurement module; Figure 6 is the circuit diagram of the current measurement module; Figure 7 This is the circuit diagram of the electromagnet drive module; Figure 8 It is a structural diagram of a smart meter; Fig. 9 for Figure 8 Schematic diagram of the structure viewed from above; Fig.10 for Fig. 9 Schematic diagram of the structure after the cover is removed; Fig.11 for Fig. 9 A magnified view of area A; Fig.12 is a schematic diagram of the structure of the terminal; Fig.13 It is a schematic diagram of the suspension state of the positioning column and the wire ring.

[0023] Figure numerals: 1. Shell; 2. Wiring area; 3. Chip area; 4. Display screen; 5. Cover; 6. Wiring terminal; 7. Electromagnet drive device; 8. Terminal; 9. Metal material; 10. Rubber material; 11. Wire ring; 12. Positioning column; 13. Terminal; 14. Electromagnet; 15. Wiring port; 16. Spring. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0026] In the description of the present invention, "multiple" means two or more than two, unless otherwise clearly defined. In the present invention, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1As shown, an intelligent control system of a smart meter includes a power conversion module and a microcontroller module connected to the power conversion module. The microcontroller module is used to control the overall process of input, operation and output of the overall system. It also includes a voltage measurement module and a current measurement module. When the voltage value and the current value are increased to exceed the threshold, information is sent, and after being processed by the microcontroller module, it is communicated and output to the mobile device. Among them, the power conversion module and the microcontroller module are also connected to an electromagnet drive module for driving the smart meter to disconnect the overall circuit. When the voltage measurement module and the current measurement module detect abnormal voltage or current, the microcontroller module processes the information and sends a warning message of electricity theft to the user and the manager, warns the user in advance, and sends the relevant information to the manager. Afterwards, the microcontroller module controls the electromagnet drive module to work, so that the connection between the smart meter and the neutral and live wires is disconnected, and the smart meter described in this application is connected to the neutral and live wires of the household power circuit. When the smart meter is powered off, the overall circuit can be powered off.

[0029] In addition, the power conversion module described in the present application is powered by an additional 12V loading power supply to improve the stability of voltage and current and prevent damage to components of the microcontroller module due to voltage and current fluctuations.

[0030] 1. Power conversion module like Figure 2 As shown, P1 is a power switch chip, and the voltage of VIN input is controlled by P1.

[0031] Among them, pins 1 and 3 of P1 are VIN input terminals (12V); pins 2 and 4 are output terminals. The current passes through P1 and reaches F1. F1 is a fuse that has the function of protecting the circuit. After that, ripple filtering is performed through C1 (22μF input filter capacitor).

[0032] After the first filtering, the current reaches the control chip U1. The control chip U1 has six ports, as follows: EN: enable control terminal; IN: voltage input terminal; SW: switch output terminal; FB: feedback detection terminal; GND: ground terminal; BS: bootstrap capacitor terminal. Its main function is to convert the 12V voltage into a 3.6V steady-state voltage.

[0033] After the voltage conversion, the current waveform is smoothed by L1 (2.2μH inductor), and then filtered for the second time by C2 (100nF high-frequency filter), where the filter is high-frequency filtering. Finally, the output voltage is filtered by C3 / C4 (22μF output filter). Finally, a stable 3.6V voltage is obtained.

[0034] The above topological circuit structure has the advantages of high efficiency, small size, low heat generation, etc., and can convert a 12V voltage into a stable voltage of 3.6V. The electromagnet drive circuit described in the present application adopts an intermediate state, that is, a stable voltage of 3.6V for power supply, which can prevent high voltage from damaging components on the one hand, and on the other hand, because it is higher than the working voltage of the microcontroller, the driving action of the electromagnet is more sensitive, and compared with the 12V voltage, it can reduce heat generation and prevent component damage.

[0035] like Figure 3 As shown in the figure, this is a 3.6V to 3.3V DC-DC buck converter circuit. It is mainly composed of the U2 voltage regulator chip, which is an LDO (low dropout linear regulator) with 5 pins: VIN is the input voltage terminal, VSS is the ground terminal, CE is the enable control terminal, NC is the unused terminal, and VOUT is the output voltage terminal.

[0036] The input end is configured with C5 capacitor (1μF) and R4 resistor (1kΩ). C5 is used as input filter capacitor to suppress ripple and noise of input voltage, and R4 is used as pull-up or current limiting resistor. U2 chip converts 3.6V input voltage to 3.3V output voltage stably. C6 filter capacitor (1μF) is connected to the output end to smooth the output voltage, and D1 diode is used for reverse connection protection or indication.

[0037] The current flows from the 3.6V power supply through C5 filtering into the VIN pin of U2, and the voltage is reduced to 3.3V through the linear adjustment circuit inside the chip, and then output from the VOUT pin. After the output current is filtered by C6, it can provide a stable 3.3V power supply for the load. The VSS pin is connected to the ground to form a current loop. The CE pin is pulled up to the power supply end through R4 to control the working state of the chip.

[0038] The above circuit has the characteristics of simple structure, small ripple and fast response, and can convert the stable 3.6V voltage into a stable 3.3V voltage to power the microcontroller module.

[0039] 2. Microcontroller module like Figure 4 As shown, the microcontroller (MCU) module has multiple communication and analog-to-digital conversion functions, operates at 3.3V, and is marked as U9. The left interface contains multiple communication ports (COM1-COM6), which are connected to the MCU's PA8-PA15 and PB3-PB4 pins for different communication functions. Among them, MCU_TX and MCU_RX (connected to PA9 and PA10) are specifically used for serial communication, which can realize data transmission and reception. The K1 signal is connected through the PB12 pin and may be used for key or external interrupt input. The K2 signal is connected through the PB13 pin and is used to output the signal to the electromagnet driver module to make the electromagnet driver module work.

[0040] There are multiple ADC analog input channels (ADC_IN8-ADC_IN12) on the right side, which are used to collect analog signals and convert them into digital quantities. They have 12-bit resolution and can accurately measure analog voltage values. LED1 is connected to the bottom pin and is used as a status indicator.

[0041] The OLED extended display interface is connected via two wires, OLEDSCI and OLEDSDA, and uses the I²C communication protocol to exchange data with the display.

[0042] The above-mentioned microcontroller module controls the operation of the overall intelligent control system through internal signal control.

[0043] 3. Voltage measurement module like Figure 5 The circuit diagram of the voltage measurement module is shown in Figure 1. It mainly includes: a resistor voltage divider network (R13, R12 10KΩ each), a voltage regulator diode D3 (1N4148) and a filter capacitor U5 (10nF). The input voltage +V is reduced by the voltage divider network of R13 and R12 to ensure that the voltage at the ADC input does not exceed 5V.

[0044] The D3 diode (1N4148) is connected to the 5V power supply as a clamping protection device to prevent the voltage at the voltage divider point from exceeding 5V+0.7V, protecting the ADC input from overvoltage damage. The U5 capacitor is used to filter out high-frequency noise and ripple of the input signal to improve sampling accuracy. Finally, the processed voltage signal is input to the analog-to-digital converter of the MCU through the ADC_IN9 port for digital conversion.

[0045] The current flows from the +V power supply through R13 to the voltage divider, and then flows to the ground through R12. If the voltage at the voltage divider exceeds 5.7V, the D3 diode will turn on and clamp the excessive voltage to a safe level. The U5 capacitor will absorb the rapid changes in voltage, allowing the ADC to sample a more stable voltage value.

[0046] The voltage measurement module can measure a relatively high voltage and input the change of the voltage signal to the microcontroller module through ADC_IN9, and the microcontroller module processes and responds to the subsequent processing process.

[0047] 4. Current measurement module like Figure 6 The figure shows the circuit diagram of the current measurement module. It uses a shunt resistor to measure the current. The core component is the U7 (100mΩ) shunt resistor. When the current to be measured flows from I+ through U7 to I-, a small voltage drop proportional to the current will be generated across the shunt resistor. R16 (1kΩ) is used as a sampling resistor to transfer the voltage signal on the shunt resistor to the ADC input and also serves as a current limiting protection. The D4 diode (1N4148) is connected to the 5V power supply and is used as an overvoltage protection to prevent the ADC input from being damaged by excessive voltage. The C7 capacitor (100pF) acts as a filter, which can suppress high-frequency noise in the sampling signal, allowing the ADC to obtain more stable measurement values.

[0048] The current flows from the I+ terminal, through the shunt resistor U7 and flows to the I- terminal. At the same time, the voltage difference generated on the shunt resistor is sent to the ADC_IN12 terminal for sampling through R16. If the sampling voltage exceeds 5.7V, the D4 diode will be turned on for clamping protection. The C7 capacitor will absorb the fast-changing components in the signal and provide a more stable sampling voltage.

[0049] 5. Electromagnet drive module like Figure 7 The figure shows the circuit diagram of the electromagnet drive module, which is used to control the operation of the electromagnet actuator. It mainly consists of the signal switch K2 (TS-1088-AR02016 model), filter capacitors C01 and C02 (both 100nF), and load YA (electromagnet). The circuit operates at 3.6V.

[0050] Its working principle is: when the current voltage received by the signal switch K2 exceeds the threshold, the microcontroller module determines it as electricity theft. The signal switch K2 is turned on, that is, the 1 and 2 terminals are connected, and the 3.6V power supply supplies power to the electromagnet YA, causing it to generate electromagnetic force to complete the action, disconnecting the connection and breaking the user's neutral and live wires. Two 100nF capacitors C01 and C02 are connected to the 3.6V control power supply and +V drive power supply respectively to suppress the transient voltage spikes generated during the switch action to prevent interference with other circuits. At the same time, they can also filter out power ripples and provide a more stable working voltage.

[0051] When K1 is closed, the current flows from the 3.6V power supply through the K2 switch, through the electromagnet YA, and finally through the ground loop. Since the electromagnet is an inductive load, a reverse electromotive force will be generated at the moment the switch is disconnected. At this time, the C02 capacitor can absorb this peak voltage to protect the switch contacts and other circuit components.

[0052] Under the above settings, when the current and voltage values ​​exceed the predetermined thresholds, the current measurement module and the voltage measurement module input the abnormal information to the microcontroller module. The microcontroller module determines that it is an act of electricity theft based on the abnormal power consumption time and the current and voltage values, and then transmits a signal to the user and the management personnel. After a certain period of time, if the current and voltage values ​​still exceed the threshold, it transmits a signal to K2, K2 closes, and then the electromagnet is energized, and the electromagnet disconnects the connection between the neutral and live wires, so that the user is powered off. At this time, the user cannot power on the circuit breaker, which fundamentally suppresses theft of electricity, reduces illegal loss of electricity, and improves power management efficiency.

[0053] The present application also provides a smart meter, which uses the above-mentioned smart control system. Figure 8 As shown, the smart meter comprises: a housing 1. A wiring area 2 is provided at the lower side of the housing 1. A chip area 3 is provided above the wiring area 2, and a display screen 4 is provided above the chip area 3. The chip area 3 is used to place PCB boards, components, etc. corresponding to the smart control system. The display screen 4 is used to display the current reading and status.

[0054] like Fig. 9 As shown, the present application emphasizes the wiring area 2. A cover 5 is connected to the outside of the wiring area 2. The cover 5 is used to cover the wiring area 2, isolate it from the outside, and improve the sealing effect. A plurality of wiring terminals 6 are provided in the wiring area 2. According to different connection methods, the corresponding neutral and live wires are connected to the wiring area 2, so that the smart meter is connected to the public circuit, and then the power is measured.

[0055] like Fig.10 , Fig.11 As shown, an electromagnet drive device 7 is provided at the interface position on the left side of the wiring area 2. The electromagnet drive device 7 is controlled by the above-mentioned electromagnet 14 drive module. It mainly includes: a terminal 8 provided in the wiring area 2. The terminal 8 integrates the connecting wires, such as Fig.12 As shown, the lower part is made of metal material 9 for connecting the live wire for conduction. The upper part is made of rubber material 10 for insulation effect.

[0056] like Fig.10 , Fig.11 As shown, a wire ring is sleeved on the terminal 8 and connected in a sliding manner. A positioning column 12 is fixedly connected to one side of the wire ring. The bottom of the positioning column 12 is made of a magnetic material. It can attract metals such as iron, cobalt, and nickel.

[0057] As mentioned above, the electric wire is integrated in the positioning column 12, and the electric wire can be connected to the wire loop. A terminal 13 is provided on one side of the positioning column 12, and the live wire is connected to the terminal 13 for connecting to a smart meter for measuring the amount of electricity.

[0058] Correspondingly, the positioning column 12 is provided with an electromagnet 14 below the positioning column 12. The electromagnet 14 is composed of an iron core and a coil. It has magnetism when conducting electricity. A wiring port 15 is provided on one side of the electromagnet 14, which is connected to the electromagnet 14 drive module through wires, thereby supplying power to the electromagnet 14.

[0059] Further, a spring 16 is provided on one side of the positioning column 12. The spring 16 is used to help the positioning column 12 to reset, so as to achieve a boosting effect when the weight of the wire loop and the terminal 8 itself is not enough to overcome the friction between the wire loop and the terminal 8.

[0060] Under the above conditions, in the initial state, the spring 16 is in a natural state. At this time, the bottom of the positioning column 12 is magnetic, which makes the positioning column 12 and the electromagnet 14 attract each other in the initial state. The attraction is generated by the magnetic attraction between the magnet and the iron core.

[0061] When electricity theft is detected, the electromagnet 14 driving module is working, and the signal switch K2 is turned on, so that the electromagnet 14 is energized, and the electromagnet 14 generates magnetism.

[0062] like Fig.10 , Fig.13 As shown, further, the magnetic poles generated by the electromagnet 14 are the same as the magnetic poles of the positioning post 12, so that when the electromagnet 14 is energized, the electromagnet 14 has a repulsive force on the positioning post 12. The positioning post 12 is separated from the electromagnet 14 under the repulsive force of the electromagnet 14, so that the positioning post 12 and the wire loop move upward and are suspended. At this time, the wire loop is at the position of the rubber material 10 of the terminal 8, and the positioning post 12 will not automatically separate from the terminal 8 under the influence of the spring 16 and the wire loop sleeved on the positioning post 12.

[0063] Under the above settings, the positioning column 12 and the wire loop are suspended in space under the reverse elastic force of the spring 16 and the repulsive force of the electromagnet 14. At this time, the wire loop contacts the rubber material part of the terminal 8 and is not energized, so that the positioning column 12 connected to the live wire cannot be energized, thereby cutting off the circuit. At this time, the user cannot re-energize the circuit by operating the circuit breaker, and the maintenance personnel can find the suspended positioning column 12 and the wire loop after opening the cover 5, and can judge the electricity theft behavior, and carry out targeted maintenance and subsequent processing.

[0064] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An intelligent control system for a smart meter, characterized in that ,include: A power conversion module, used to perform a secondary voltage drop on the power supply; A microcontroller module electrically connected to the power conversion module, used to control the input, operation and output of the system; A voltage measurement module, used for measuring input voltage and transmitting the signal to the microcontroller module; A current measurement module, used for measuring input current and transmitting the signal to the microcontroller module; The electromagnet drive module is electrically connected to the microcontroller module and is powered by the power conversion module. It is used to drive the electromagnet to disconnect the circuit when electricity theft is detected.

2. The intelligent control system according to claim 1 is characterized in that , the power conversion module includes: A first conversion circuit, configured to convert a 12V voltage into a 3.6V voltage; the first conversion circuit comprises a power switch chip, a fuse, an input filter capacitor, a control chip, an inductor, and an output filter capacitor; and is used to power the electromagnet drive module; The second conversion circuit is used to convert the 3.6V voltage into a 3.3V voltage; the second conversion circuit includes a voltage stabilizing chip, an input filter capacitor, a pull-up resistor and an output filter capacitor, and is used to power the microcontroller module.

3. The intelligent control system according to claim 1 is characterized in that , the voltage measurement module includes: A voltage divider resistor network is used to reduce the input voltage to a safe level; The voltage regulator diode is used to prevent the voltage at the voltage dividing point from exceeding the preset value; Filter capacitor is used to filter out high-frequency noise of input signal.

4. The intelligent control system according to claim 1 is characterized in that , the current measurement module includes: Shunt resistor, used to produce a voltage drop proportional to the current; A sampling resistor is used to transmit the voltage signal on the shunt resistor to the microcontroller module; Protection diode to prevent excessive voltage; Filter capacitor is used to suppress high-frequency noise in the sampling signal.

5. A smart meter, characterized in that ,include: The intelligent control system according to any one of claims 1 to 4; A housing, wherein a wiring area and a chip area are provided in the housing; a cover body, detachably connected to the shell; an electromagnet drive device, disposed in the wiring area, for disconnecting the circuit when electricity theft is detected; A terminal post is provided in the wiring area and includes a metal material provided on the lower side and a rubber material provided on the upper side; The electromagnet driving device comprises: A wire ring is sleeved on the terminal and slides between the metal material and the rubber material; A positioning column, the bottom of which is provided with magnetic material and is connected to the wire loop; An electromagnet is arranged below the positioning column; The positioning post is initially attracted to the electromagnet. When the electromagnet is energized, the electromagnet generates a repulsive force that causes the positioning post to move away from the electromagnet, thereby enabling the wire loop to transition from being in contact with the metal material to being insulated from the rubber material.

6. The smart meter according to claim 5, characterized in that A spring is provided between the wire loop, the positioning column and the wiring area, and the spring is used to keep the wire loop in a suspended state for easy observation.

7. The smart meter according to claim 5, characterized in that The electromagnetic poles of the electromagnet are the same as the magnetic poles of the magnetic material at the bottom of the positioning column, and they repel each other.

8. The smart meter according to claim 5, characterized in that ,The smart meter is also provided with a display screen for observing the ,power readings and status.

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