Communication circuit of intelligent electric meter and intelligent electric meter

Abstract

The utility model provides a communication circuit of an intelligent electric meter and the intelligent electric meter. The communication circuit comprises a control module, and an encryption module and a communication module which are respectively connected with the control module, the communication module is in communication connection with an external master station; the encryption module is used for encrypting data sent to the communication module by the control module according to a preset encryption rule; and decrypting the data returned by the communication module according to a preset encryption rule. In the mode, the encryption module is arranged in the communication circuit of the intelligent electric meter, so that the safety and integrity of communication between the intelligent electric meter and the master station can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smart meters, in particular to a communication circuit of a smart meter and a smart meter. Background Art

[0002] At present, smart meters are more and more widely used in smart grids. Smart meters can collect users' electricity consumption data in real time and transmit the data to a remote master station through a communication module, which is convenient for power companies to conduct remote monitoring and management. In the smart meter communication system, the security and integrity of data transmission are crucial. At present, smart meters transmit data through wireless networks, which are vulnerable to eavesdropping and tampering attacks, resulting in the leakage or tampering of users' electricity consumption information, making the meter data transmitted in the smart meter communication system unreliable and insecure. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a communication circuit of a smart meter and a smart meter, which can improve the security and integrity of communication between the smart meter and the master station.

[0004] In a first aspect, an embodiment of the utility model provides a communication circuit of a smart meter, including: a control module, an encryption module and a communication module respectively connected to the control module; the communication module is communicatively connected to an external master station; the encryption module is used for encrypting the data sent from the control module to the communication module according to a preset encryption rule; and decrypting the data returned by the communication module according to the preset encryption rule.

[0005] Further, a conversion module is provided between the control module and the communication module; the conversion module includes: a sixth triode, an eighth triode, a fourteenth capacitor, a fifteenth capacitor, a seventeenth capacitor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-eighth resistor, a thirtieth resistor, and a thirty-first resistor; the first end of the twenty-sixth resistor is respectively connected to the signal input end and the first end of the fourteenth capacitor, and the second end is respectively connected to the second end of the fourteenth capacitor, the first end of the thirty-first resistor, and the base of the eighth triode; the collector of the eighth triode is connected to the second end of the twenty-fifth resistor; the second end of the thirty-first resistor and the emitter of the eighth triode are respectively grounded; the base of the sixth triode is connected to the collector of the eighth triode through the twenty-sixth resistor; both ends of the twenty-sixth resistor are respectively connected to both ends of the seventeenth capacitor; the second end of the twenty-sixth resistor is connected to the first end of the thirtieth resistor; the second end of the twenty-sixth resistor and the emitter of the sixth triode are respectively grounded; the collector of the sixth triode is respectively connected to the second end of the twenty-third resistor and the first end of the twenty-fourth resistor; the second end of the twenty-fourth resistor is respectively connected to the signal output end and the first end of the fifteenth capacitor; the second end of the fifteenth capacitor is grounded; the conversion module is used to convert the corresponding level of the data sent by the signal input end into a level that can be received by the signal output end.

[0006] Further, the conversion module includes a first conversion circuit or a second conversion circuit; the signal input end of the first conversion circuit is connected to the control module, and the signal output end of the first conversion circuit is connected to the communication module; the signal input end of the second conversion circuit is connected to the communication module, and the signal output end of the second conversion circuit is connected to the control module.

[0007] Further, the communication circuit of the smart meter further includes a power supply module; the communication module includes a first power supply unit; the first power supply unit is connected to the power supply module; the first power supply unit is respectively connected to the first end of the twenty-fifth resistor in the first conversion circuit and the first end of the twenty-third resistor in the first conversion circuit.

[0008] Further, the communication module further includes a CatM module; the CatM module is connected to the first power supply unit.

[0009] Further, the communication circuit of the smart meter further includes a power supply module; the control module includes a second power supply unit; the second power supply unit is connected to the power supply module; the second power supply unit is respectively connected to the first end of the twenty-fifth resistor in the second conversion circuit and the first end of the twenty-third resistor in the second conversion circuit; the second power supply unit includes: a fourteenth diode, a seventh chip, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, and a forty-sixth capacitor; the first pin of the seventh chip is grounded; the second pin of the seventh chip is connected to the output end of the power supply module through the fourteenth diode, and the first ends of the forty-second capacitor and the forty-third capacitor are respectively connected to the second pin of the seventh chip; the third pin of the seventh chip is respectively connected to the first ends of the forty-fourth capacitor, the forty-fifth capacitor, and the forty-sixth capacitor; the second ends of the forty-second capacitor, the forty-third capacitor, the forty-fourth capacitor, the forty-fifth capacitor, and the forty-sixth capacitor are all grounded.

[0010] Further, the control module further includes a control chip; the control chip is connected to the second power supply unit.

[0011] Further, the encryption module includes an encryption chip; the encryption chip is connected to the control chip through the fifth pin and the sixth pin; the encryption chip is connected to the second power supply unit through the eighth pin.

[0012] In a second aspect, an embodiment of the present invention provides a smart meter, including a smart meter body; and further including the communication circuit of the smart meter according to any one of the above; the communication circuit of the smart meter is disposed in the smart meter body.

[0013] Further, it further includes a sensor; the communication circuit of the smart meter includes a control module; the sensor is connected to the control module.

[0014] An embodiment of the present invention provides a communication circuit and a smart meter for a smart meter, including: a control module, an encryption module, and a communication module respectively connected to the control module; the communication module is communicatively connected to an external main station; the encryption module is configured to encrypt data sent from the control module to the communication module according to a preset encryption rule; and decrypt data returned from the communication module according to the preset encryption rule. In this way, by setting an encryption module in the communication circuit of the smart meter, the security and integrity of the communication between the smart meter and the main station can be improved.

[0015] Other features and advantages of the present invention will be described in subsequent specifications, and, in part, will become apparent from the specifications or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specifications, claims, and drawings.

[0016] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and detailed descriptions are as follows. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the communication circuit of the smart meter provided in the first embodiment of the present utility model;

[0019] Figure 2 Schematic diagram of the communication circuit of another smart meter provided in the first embodiment of the present utility model;

[0020] Figure 3 Circuit diagram of the conversion module provided in the first embodiment of the present utility model;

[0021] Figure 4 Schematic diagram of the CatM module provided in the first embodiment of the present utility model;

[0022] Figure 5 Circuit diagram of the second power supply unit provided in the first embodiment of the present utility model;

[0023] Figure 6 Schematic diagram of the control chip provided in the first embodiment of the present utility model;

[0024] Figure 7 Schematic diagram of the encryption chip provided in the first embodiment of the present utility model;

[0025] Figure 8 Schematic diagram of the smart meter provided in the second embodiment of the present utility model.

[0026] Icons: 1 - Control module; 2 - Encryption module; 3 - Communication module; 4 - Master station; 5 - Conversion module; 6 - Power supply module; 11 - Second power supply unit; 31 - First power supply unit; 32 - CatM module; 51 - First conversion circuit; 52 - Second conversion circuit; 7 - Smart meter body; 8 - Communication circuit of smart meter; 9 - Sensor; D6 - Sixth triode; D8 - Eighth triode; C14 - Fourteenth capacitor; C15 - Fifteenth capacitor; C17 - Seventeenth capacitor; R23 - Twenty-third resistor; R24 - Twenty-fourth resistor; R25 - Twenty-fifth resistor; R26 - Twenty-sixth resistor; R28 - Twenty-eighth resistor; R30 - Thirtieth resistor; R31 - Thirty-first resistor; D14 - Fourteenth diode; U7 - Seventh chip; C42 - Forty-second capacitor; C43 - Forty-third capacitor; C44 - Forty-fourth capacitor; C45 - Forty-fifth capacitor; C46 - Forty-sixth capacitor; U8 - Control chip; UA1 - Encryption chip. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model.

[0028] To facilitate the understanding of this embodiment, the embodiments of the present utility model will be introduced in detail below.

[0029] Embodiment 1:

[0030] Figure 1 This is a schematic diagram of the communication circuit of the smart meter provided in Embodiment 1 of the present utility model.

[0031] Refer to Figure 1 , the communication circuit of the smart meter includes: a control module 1, an encryption module 2 and a communication module 3 respectively connected to the control module 1; the communication module 3 is communicatively connected to an external master station 4.

[0032] The encryption module 2 is used to encrypt the data sent from the control module 1 to the communication module 3 according to a preset encryption rule; decrypt the data returned by the communication module 3 according to a preset encryption rule.

[0033] Here, the preset encryption rules are set in advance according to the actual situation, and can be AES (Advanced Encryption Standard) and DES (Data Encryption Standard), etc. The preset encryption rules are stored in the encryption module 2 and the master station 4 respectively. The encryption module 2 and the master station 4 encrypt or decrypt data according to the preset encryption rules.

[0034] The control module 1 sorts and packages the collected data to form a data to be sent, which usually includes information such as a timestamp, data type, data value, etc. The control module 1 identifies the data to be sent, determines which data needs to be encrypted, and sends the data that needs to be encrypted in the data to be sent to the encryption module 2. The encryption module 2 encrypts the data to be sent according to the preset encryption rules to obtain the encrypted data to be sent. The encrypted data to be sent contains the encrypted data part and some control information that may not need to be encrypted. The encryption module 2 sends the encrypted data to be sent to the control module 1, and the control module 1 sends the encrypted data to be sent to the communication module 3; the communication module 3 sends the encrypted data to be sent to the master station 4 through the wireless network.

[0035] The master station 4 extracts the encrypted data part in the encrypted data to be sent, decrypts the encrypted data part according to the preset encryption rules to obtain the data to be sent. The master station 4 generates response data according to the data to be sent, encrypts the response data according to the preset encryption rules to obtain the response data to be decrypted, and sends the response data to be decrypted to the communication module 3. Among them, the response data may include information confirming that the master station 4 has received the data, and may also include key feedback information such as processing results, timestamps, and error information, etc. The response information helps the meter module adjust its operations to ensure the reliability and accuracy of data communication.

[0036] The communication module 3 receives the response data to be decrypted returned by the master station 4, and sends the response data to be decrypted to the control module 1. The control module 1 sends the response data to be decrypted to the encryption module 2 so that the encryption module 2 decrypts the response data to be decrypted to obtain the decrypted response data to be decrypted.

[0037] In an embodiment, referring to Figure 2 , a conversion module 5 is provided between the control module 1 and the communication module 3.

[0038] The conversion module 5 is used to convert the corresponding level of the data sent by the signal input end into a level that can be received by the signal output end.

[0039] Here, the operating voltages of the control module 1 and the communication module 3 are different. When the voltage of the control module 1 is 3.3V and the operating voltage of the communication module 3 is 1.8V, the conversion circuit converts the voltage level of the signal from one voltage level to another while keeping the high and low levels of the signal unchanged. This means that if the input signal is a high level (e.g., 3.3V), it remains a high level after conversion (but becomes 1.8V); if the input signal is a low level (e.g., 0V), it remains a low level (0V) after conversion.

[0040] Referring to Figure 3 , the conversion module 5 includes: the sixth triode D6, the eighth triode D8, the fourteenth capacitor C14, the fifteenth capacitor C15, the seventeenth capacitor C17, the twenty-third resistor R23, the twenty-fourth resistor R24, the twenty-fifth resistor R25, the twenty-sixth resistor R26, the twenty-eighth resistor R28, the thirtieth resistor R30, and the thirty-first resistor R31.

[0041] The first end of the twenty-sixth resistor R26 is respectively connected to the signal input end and the first end of the fourteenth capacitor C14, and the second end is respectively connected to the second end of the fourteenth capacitor C14, the first end of the thirty-first resistor R31, and the base of the eighth triode D8; the collector of the eighth triode D8 is connected to the second end of the twenty-fifth resistor R25; the second end of the thirty-first resistor R31 and the emitter of the eighth triode D8 are respectively grounded.

[0042] The base of the sixth triode D6 is connected to the collector of the eighth triode D8 through the twenty-sixth resistor R26; both ends of the twenty-sixth resistor R26 are respectively connected to both ends of the seventeenth capacitor C17; the second end of the twenty-sixth resistor R26 is connected to the first end of the thirtieth resistor R30; the second end of the twenty-sixth resistor R26 and the emitter of the sixth triode D6 are respectively grounded.

[0043] The collector of the sixth triode D6 is respectively connected to the second end of the twenty-third resistor R23 and the first end of the twenty-fourth resistor R24; the second end of the twenty-fourth resistor R24 is respectively connected to the signal output end and the first end of the fifteenth capacitor C15; the second end of the fifteenth capacitor C15 is grounded.

[0044] Here, the sixth triode D6 and the eighth triode D8 are used as switches. By controlling the opening and closing of the sixth triode D6 and the eighth triode D8, data can be effectively converted and transmitted between the signal input end and the signal output end.

[0045] The eighth triode D8 serves as the first-stage switch. When the base receives a high-level signal, the eighth triode D8 conducts, and the collector level is pulled low. The sixth triode D6 serves as the second-stage switch. When the eighth triode D8 conducts, the sixth triode D6 cuts off; when the eighth triode D8 cuts off, the sixth triode D6 conducts.

[0046] The thirtieth resistor R30 and the thirty-first resistor R31 are both pull-down resistors, which prevent the triode from malfunctioning due to the influence of noise signals and ensure that the base of the triode is in a stable low level when there is no signal input.

[0047] The twenty-sixth resistor R26 and the twenty-eighth resistor R28 are both current-limiting resistors, which limit the base current and ensure the normal operation of the triode.

[0048] The twenty-third resistor R23 and the twenty-fifth resistor R25 are both pull-up resistors, which provide a conduction voltage to the base of the triode so that the triode can perform a switching action.

[0049] The twenty-fourth resistor R24 and the fifteenth capacitor C15 form an RC filter circuit to filter out the interference signals in the circuit and make the pulse signal more stable.

[0050] The fourteenth capacitor C14 and the seventeenth capacitor C17 are both acceleration capacitors. Using the principle that the voltage across the capacitor cannot change suddenly, when receiving the high-low change of the pulse signal, the switching action of the triode is accelerated.

[0051] Specifically, when the signal input terminal is at a high level, the base current of the eighth triode D8 increases, the eighth triode D8 conducts, the collector level of the eighth triode D8 is pulled low, resulting in a low base voltage of the sixth triode D6, and the sixth triode D6 cuts off. The signal output terminal outputs a high level (pulled up to the level that the signal output terminal can receive by the twenty-third resistor R23).

[0052] When the signal at the signal input terminal is at a low level, the base current of the eighth triode D8 decreases, the eighth triode D8 cuts off, the collector voltage of the eighth triode D8 is pulled up to the level that the signal output terminal can receive by the twenty-fifth resistor R25, resulting in a high base voltage of the sixth triode D6, and the sixth triode D6 conducts. The signal output terminal outputs a low level.

[0053] In an embodiment, referring to Figure 2 , the conversion module 5 includes a first conversion circuit 51 or a second conversion circuit 52.

[0054] The signal input terminal of the first conversion circuit 51 is connected to the control module 1, and the signal output terminal of the first conversion circuit 51 is connected to the communication module 3.

[0055] The signal input terminal of the second conversion circuit 52 is connected to the communication module 3, and the signal output terminal of the second conversion circuit 52 is connected to the control module 1.

[0056] In one embodiment, referring to Figure 2 , the communication circuit of the smart meter further includes a power supply module 6; the communication module 3 includes a first power supply unit 31; the first power supply unit 31 is connected to the power supply module 6; the first power supply unit 31 is respectively connected to the first end of the twenty-fifth resistor R25 in the first conversion circuit 51 and the first end of the twenty-third resistor R23 in the first conversion circuit 51.

[0057] The control module 1 includes a second power supply unit 11; the second power supply unit 11 is connected to the power supply module 6; the second power supply unit 11 is respectively connected to the first end of the twenty-fifth resistor R25 in the second conversion circuit 52 and the first end of the twenty-third resistor R23 in the second conversion circuit 52.

[0058] Here, the voltages provided by the first power supply unit 31 and the second power supply unit 11 are different.

[0059] Specifically, assume that the first power supply unit 31 provides a voltage of 3.3V and the second power supply unit 11 provides a voltage of 1.8V.

[0060] In the first conversion circuit 51, the data sent by the control module 1 is binary data. The control module 1 outputs a high level (3.3V) through the signal input terminal. The high-level signal is transmitted to the base of the eighth triode D8 through the twenty-eighth resistor R28, the thirty-first resistor R31, and the fourteenth capacitor C14, causing the eighth triode D8 to conduct. After the eighth triode D8 conducts, its collector voltage is pulled down to near the ground potential (0V), causing the base voltage of the sixth triode D6 to also be pulled down, resulting in the sixth triode D6 being cut off. In the cut-off state of the sixth triode D6, the twenty-third resistor R23 pulls the signal output terminal to a high level (1.8V) so that the RXD pin of the communication module 3 receives a high-level signal of 1.8V.

[0061] In the first conversion circuit, the control module 1 outputs a low level (0V) through the signal input terminal. The low-level signal is transmitted to the base of the eighth triode D8 through the twenty-eighth resistor R28, the thirty-first resistor R31, and the fourteenth capacitor C14, causing the eighth triode D8 to be cut off. After the eighth triode D8 is cut off, its collector voltage is pulled up to 1.8V through the twenty-fifth resistor R25, causing the base voltage of the sixth triode D6 to also be pulled up, resulting in the sixth triode D6 conducting. In the conducting state of the sixth triode D6, the signal output terminal line is pulled down to near the ground potential (0V) so that the RXD pin of the communication module 3 receives a low-level signal of 0V.

[0062] In the second conversion circuit, the data sent by communication module 3 is binary data. Communication module 3 outputs a high level (1.8V) through the signal input terminal. The high-level signal is transmitted to the base of the eighth triode D8 through the twenty-eighth resistor R28, the thirty-first resistor R31, and the fourteenth capacitor C14, causing the eighth triode D8 to conduct. After the eighth triode D8 conducts, its collector voltage is pulled down to near the ground potential (0V), causing the base voltage of the sixth triode D6 to also be pulled down, resulting in the sixth triode D6 being cut off. In the cut-off state of the sixth triode D6, the twenty-third resistor R23 pulls the signal output terminal to a high level (3.3V) so that the RXD pin of the control module 1 receives a high-level signal of 3.3V.

[0063] In the second conversion circuit, communication module 3 outputs a low level (0V) through the signal input terminal. The low-level signal is transmitted to the base of the eighth triode D8 through the twenty-eighth resistor R28, the thirty-first resistor R31, and the fourteenth capacitor C14, causing the eighth triode D8 to be cut off. After the eighth triode D8 is cut off, its collector voltage is pulled up to 3.3V through the twenty-fifth resistor R25, causing the base voltage of the sixth triode D6 to also be pulled up, resulting in the sixth triode D6 conducting. In the conducting state of the sixth triode D6, the signal output terminal line is pulled down to near the ground potential (0V) so that the RXD pin of the control module 1 receives a low-level signal of 0V.

[0064] In one embodiment, referring to Figure 4 and Figure 2 , communication module 3 further includes a CatM module 32; the CatM module 32 is connected to the first power supply unit 31.

[0065] The CatM module 32 (Cat-M Module) refers to a communication module that adopts LTE CatM technology. LTE CatM is a low-power wide-area network (LPWAN) technology designed specifically for the Internet of Things (IoT), which is a subset of the LTE (Long Term Evolution) mobile communication standard. Its main features include: low power consumption, which is very suitable for battery-powered devices and can significantly extend battery life. Wide coverage, with a wide signal coverage range, suitable for use in urban and rural areas. Compared with traditional LTE modules, the CatM module 32 has a lower cost and is suitable for large-scale deployment. It can support the communication requirements of devices moving at relatively high speeds.

[0066] The CatM module 32 includes an antenna interface for wireless communication.

[0067] Through the CatM module 32, the electricity meter data can be transmitted to the master station 4 through the mobile communication network to realize functions such as remote meter reading, monitoring, and management.

[0068] In one embodiment, referring to Figure 5 , the second power supply unit 11 includes: a fourteenth diode D14, a seventh chip U7, a forty-second capacitor C42, a forty-third capacitor C43, a forty-fourth capacitor C44, a forty-fifth capacitor C45, and a forty-sixth capacitor C46.

[0069] The first pin of the seventh chip U7 is grounded.

[0070] The second pin of the seventh chip U7 is connected to the output terminal of the power supply module 6 through the fourteenth diode D14, and the first ends of the forty-second capacitor C42 and the forty-third capacitor C43 are respectively connected to the second pin of the seventh chip U7.

[0071] The third pin of the seventh chip U7 is respectively connected to the first ends of the forty-fourth capacitor C44, the forty-fifth capacitor C45, and the forty-sixth capacitor C46.

[0072] The second ends of the forty-second capacitor C42, the forty-third capacitor C43, the forty-fourth capacitor C44, the forty-fifth capacitor C45, and the forty-sixth capacitor C46 are all grounded.

[0073] Here, the fourteenth diode D14 is a rectifier diode to prevent reverse current from damaging the circuit and protect the power supply module 6.

[0074] The forty-second capacitor C42 is used for filtering and suppressing high-frequency noise.

[0075] The forty-third capacitor C43 is used for filtering and stabilizing the input voltage.

[0076] The forty-fourth capacitor C44 is used for providing high-frequency filtering of the output voltage to remove power supply noise.

[0077] The forty-fifth capacitor C45 is used for providing low-frequency filtering of the output voltage to stabilize the output voltage.

[0078] The forty-sixth capacitor C46 is used for further filtering to ensure the stability of the output voltage.

[0079] The seventh chip U7 acts as a linear voltage regulator, receives the filtered input voltage from the power supply module 6, and stably converts the input voltage into a 3.3V output through its internal regulation circuit for use by the modules connected thereto.

[0080] In one embodiment, referring to Figure 6 and Figure 2 , the control module 1 further includes a control chip U8; the control chip U8 is connected to the second power supply unit 11.

[0081] In one embodiment, referring to Figure 7 andFigure 2 , the encryption module 2 includes an encryption chip UA1; the encryption chip UA1 is connected to the control chip U8 through the fifth pin and the sixth pin; the encryption chip UA1 is connected to the second power supply unit 11 through the eighth pin.

[0082] An embodiment of the present invention provides a communication circuit for an intelligent electric meter, including: a control module, an encryption module and a communication module respectively connected to the control module; the communication module is communicatively connected to an external main station; the encryption module is configured to encrypt the data sent from the control module to the communication module according to a preset encryption rule; and decrypt the data returned by the communication module according to the preset encryption rule. In this way, by setting an encryption module in the communication circuit of the intelligent electric meter, the security and integrity of the communication between the intelligent electric meter and the main station can be improved. At the same time, a conversion module is provided between the control module and the communication module to solve the problem of level mismatch between the control module and the communication module, improve the stability and reliability of data transmission, and prevent circuit damage caused by level mismatch or other reasons.

[0083] Embodiment Two:

[0084] Figure 8 It is a schematic diagram of an intelligent electric meter provided by Embodiment Two of the present invention.

[0085] Referring to Figure 8 , the intelligent electric meter includes an intelligent electric meter body 7; it further includes the communication circuit 8 of the above-mentioned intelligent electric meter; the communication circuit 8 of the intelligent electric meter is arranged in the intelligent electric meter body 7.

[0086] Here, the intelligent electric meter is communicatively connected to an external main station.

[0087] The communication circuit 8 of the intelligent electric meter sends the collected data to the main station after encryption processing. The data that needs to be encrypted includes: measurement data, such as key data like meter readings, power consumption, real-time current, voltage, and power; user information, including user ID, account information, etc.; control commands, commands for remotely configuring the electric meter, such as operation commands like power off, power restoration, and electricity price adjustment; diagnostic information, status information of the electric meter, such as fault reports, firmware versions, and running time.

[0088] In one embodiment, it further includes a sensor 9; the communication circuit 8 of the intelligent electric meter includes a control module 1; the sensor 9 is connected to the control module 1.

[0089] Here, the intelligent electric meter collects measurement data through the sensor.

[0090] An embodiment of the present invention provides an intelligent electric meter. In this way, by setting an encryption module in the communication circuit of the intelligent electric meter, the reliability and accuracy of data communication between the intelligent electric meter and the main station can be improved.

[0091] The computer program product provided by the embodiment of the present utility model includes a computer-readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the method described in the foregoing method embodiment. For specific implementation, reference can be made to the method embodiment, which will not be elaborated herein.

[0092] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems and devices described above can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated herein.

[0093] In addition, in the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0094] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present utility model, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present utility model. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0095] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0096] Finally, it should be noted that the above-described embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the technical field of the present utility model can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims described.

Claims

1. A communication circuit of an intelligent electric meter, characterized in that, Including: A control module, an encryption module and a communication module respectively connected to the control module; The communication module is communicatively connected to a peripheral master station; The encryption module is configured to encrypt the data sent from the control module to the communication module according to a preset encryption rule; and decrypt the data returned by the communication module according to the preset encryption rule.

2. The communication circuit of the smart meter according to claim 1, characterized in that A conversion module is provided between the control module and the communication module; the conversion module includes: a sixth triode, an eighth triode, a fourteenth capacitor, a fifteenth capacitor, a seventeenth capacitor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-eighth resistor, a thirtieth resistor and a thirty-first resistor; The first end of the twenty-sixth resistor is respectively connected to the signal input end and the first end of the fourteenth capacitor, and the second end is respectively connected to the second end of the fourteenth capacitor, the first end of the thirty-first resistor and the base of the eighth triode; the collector of the eighth triode is connected to the second end of the twenty-fifth resistor; the second end of the thirty-first resistor and the emitter of the eighth triode are respectively grounded; The base of the sixth triode is connected to the collector of the eighth triode through the twenty-sixth resistor; both ends of the twenty-sixth resistor are respectively connected to both ends of the seventeenth capacitor; the second end of the twenty-sixth resistor is connected to the first end of the thirtieth resistor; the second end of the twenty-sixth resistor and the emitter of the sixth triode are respectively grounded; The collector of the sixth triode is respectively connected to the second end of the twenty-third resistor and the first end of the twenty-fourth resistor; the second end of the twenty-fourth resistor is respectively connected to the signal output end and the first end of the fifteenth capacitor; the second end of the fifteenth capacitor is grounded; The conversion module is configured to convert the corresponding level of the data sent from the signal input end into a level receivable by the signal output end.

3. The communication circuit of the smart meter according to claim 2, characterized in that, The conversion module includes a first conversion circuit or a second conversion circuit; The signal input end of the first conversion circuit is connected to the control module, and the signal output end of the first conversion circuit is connected to the communication module; The signal input end of the second conversion circuit is connected to the communication module, and the signal output end of the second conversion circuit is connected to the control module.

4. The communication circuit of the smart meter according to claim 3, characterized in that, The communication circuit of the smart meter further includes a power supply module; the communication module includes a first power supply unit; the first power supply unit is connected to the power supply module; the first power supply unit is respectively connected to the first end of the twenty-fifth resistor in the first conversion circuit and the first end of the twenty-third resistor in the first conversion circuit.

5. The communication circuit of the smart meter according to claim 4, characterized in that, The communication module further includes a CatM module; the CatM module is connected to the first power supply unit.

6. The communication circuit of the smart meter according to claim 3, wherein, The communication circuit of the smart meter further includes a power supply module; the control module includes a second power supply unit; the second power supply unit is connected to the power supply module; the second power supply unit is respectively connected to the first end of the twenty-fifth resistor in the second conversion circuit and the first end of the twenty-third resistor in the second conversion circuit; The second power supply unit includes: a fourteenth diode, a seventh chip, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, and a forty-sixth capacitor; The first pin of the seventh chip is grounded; The second pin of the seventh chip is connected to the output terminal of the power supply module through the fourteenth diode, and the first ends of the forty-second capacitor and the forty-third capacitor are respectively connected to the second pin of the seventh chip; The third pin of the seventh chip is connected to the first ends of the forty-fourth capacitor, the forty-fifth capacitor, and the forty-sixth capacitor respectively; The second ends of the forty-second capacitor, the forty-third capacitor, the forty-fourth capacitor, the forty-fifth capacitor, and the forty-sixth capacitor are all grounded.

7. The communication circuit of the smart meter according to claim 6, wherein The control module further includes a control chip; the control chip is connected to the second power supply unit.

8. The communication circuit of the smart meter according to claim 7, wherein, The encryption module includes an encryption chip; the encryption chip is connected to the control chip through a fifth pin and a sixth pin; the encryption chip is connected to the second power supply unit through an eighth pin.

9. An intelligent electric meter, characterized in that, It includes an intelligent electricity meter body; it further includes the communication circuit of the intelligent electricity meter according to any one of claims 1-8; the communication circuit of the intelligent electricity meter is arranged in the intelligent electricity meter body.

10. The smart meter according to claim 9, characterized in that, It further includes a sensor; the communication circuit of the intelligent electricity meter includes a control module; the sensor is connected to the control module.

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