Single-phase multiple anti-theft ammeter based on DLMS protocol

Abstract

The utility model provides a single-phase multiple anti-theft ammeter based on a DLMS protocol, which solves the problems of single anti-theft detection mode and the like, and comprises an MCU module, the MCU module is connected with a power supply module, a sampling module, a communication module and a relay module, and the MCU module is connected with a liquid crystal display module and a storage module. The MCU module is connected with an infrared communication module, a power failure detection module and an input detection module. The electricity larceny prevention device has the advantages of good electricity larceny prevention effect, stable operation and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of smart meters, and particularly relates to a single-phase multiple anti-theft electricity meter based on the DLMS protocol. Background Technique

[0002] Theft of electricity behavior causes economic losses to power companies and also affects the stability and security of the power grid. In areas with tight power consumption, the theft of electricity behavior is particularly serious. Anti-theft electricity meters can reduce the losses of power companies and improve economic benefits. 4G communication technology has matured, which can provide stable and high-speed data transmission, suitable for remote meter reading and real-time monitoring, timely discovering abnormal electricity consumption behavior, and effectively preventing and combating the theft of electricity behavior. Due to its intelligent characteristics, anti-theft electricity meters are easier to supervise and maintain, which helps to improve the work efficiency of power management departments. However, in the actual use process, the existing anti-theft electricity meters have a relatively single anti-theft detection method and there are monitoring loopholes.

[0003] In order to solve the deficiencies of the existing technology, people have carried out long-term explorations and put forward various solutions. For example, a Chinese patent document discloses an anti-theft electricity meter [201310470576.X], which includes a meter case and a near-infrared reading device matched therewith. Among them, a wiring terminal, a processor and an infrared communication part are arranged in the meter case. The infrared communication part is electrically connected to the processor. The L line and N line of the power grid supply line are connected to the electricity meter through the wiring terminal, and further includes a voltage reduction part, an analog input part, a power detection part and a strong magnetic detection part. The wiring terminal is branched to the analog input part and the voltage reduction part. The analog input part is electrically connected to the processor. The voltage reduction part is electrically connected to the processor through the power detection part and the strong magnetic detection part respectively. Among them, the infrared communication part and the near-infrared reading device are mutually cooperated and connected, and are mutually communicated and coupled through the infrared communication method.

[0004] The above solution solves the problem of external communication of the anti-theft electricity meter to a certain extent, but there are still many deficiencies in this solution, such as the relatively single anti-theft detection method and other problems. Summary of the Invention

[0005] The purpose of the utility model is to provide a single-phase multiple anti-theft electricity meter based on the DLMS protocol with reasonable design and good detection effect for the above problems.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A single-phase multiple anti-theft electricity meter based on the DLMS protocol, including an MCU module, the MCU module is connected with a power supply module, the MCU module is connected with a sampling module, the MCU module is connected with a communication module and a relay module, the MCU module is connected with a liquid crystal display module and a storage module, and the MCU module is connected with an infrared communication module, a power-off detection module and an input detection module.

[0007] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the MCU module includes an MCU chip IC2 of model HT5015, and the MCU chip IC2 is equipped with an interface J4 and an interface J1.

[0008] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the power supply module includes an AC power supply circuit, a system power supply circuit, a PT power supply circuit, and a module power supply circuit.

[0009] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the AC power supply circuit includes a variable resistor unit RT1. The variable resistor unit RT1 is connected to a bridge DF1 through a voltage transformation unit U4. The bridge DF1 is connected to an AC-DC conversion chip IC8, and the bridge DF1 is connected to a transformer T1 and an optocoupler U5. The system power supply circuit includes a voltage regulator chip IC6 and a voltage regulator chip IC7. The PT power supply circuit includes a power transformer IC12. The module power supply circuit includes a voltage regulator chip IC11.

[0010] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the sampling module includes a current transformer sampling circuit, a shunt sampling circuit, and a voltage sampling circuit.

[0011] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the communication module includes a 4G communication chip of model EC200A. The communication module has a GPRS chip IC1 and an optocoupler U2, and the communication module has a SIM chip IC3 and an isolation chip D2.

[0012] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the relay module includes a relay drive circuit and a relay feedback circuit. The relay drive circuit includes a drive chip IC10A, and the relay feedback circuit includes an optocoupler U3.

[0013] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the liquid crystal display module includes a segment LCD display screen and a drive chip LCD1.

[0014] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the storage module includes a FLASH memory IC5 and an EEP memory IC9. The FLASH memory IC5 and the EEP memory IC9 are equipped with data backup chips IC16 and IC4.

[0015] In the above single-phase multi-anti-theft electricity meter based on the DLMS protocol, the infrared communication module includes an infrared emitter LED4 and an infrared receiver IR1. The input detection module includes a linear Hall sensor IC2 and a key switch SW1.

[0016] Compared with the existing technologies, the advantages of the present utility model are as follows: while the electric meter sampling module detects current and voltage, it also conducts power-off detection and input detection, effectively preventing various electricity theft modes; it supports 4G communication in the upstream, uses the standard DLMS protocol, and is convenient for accessing various cloud platforms; it supports AES-GCM encryption, and supports monthly and daily bills, configurable load curve monitoring, and event recording. Description of the Drawings

[0017] Figure 1 is a circuit schematic diagram of the MCU module of the present utility model;

[0018] Figure 2 is a circuit schematic diagram of the power supply module of the present utility model;

[0019] Figure 3 is a circuit schematic diagram of the sampling module of the present utility model;

[0020] Figure 4 is a circuit schematic diagram of the communication module of the present utility model;

[0021] Figure 5 is a circuit schematic diagram of the relay module of the present utility model;

[0022] Figure 6 is a circuit schematic diagram of the liquid crystal display module of the present utility model;

[0023] Figure 7 is a partial circuit schematic diagram of the present utility model;

[0024] Figure 8 is a circuit schematic diagram of the storage module of the present utility model. Detailed Embodiments

[0025] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0026] As Figure 1-8 shown, a single-phase multiple anti-theft electric meter based on the DLMS protocol, which supports active level 1 and reactive level 2 accuracy metering. Specifically, it includes an MCU module, the MCU module is connected to a power supply module, the MCU module is connected to a sampling module, the MCU module is connected to a communication module and a relay module, the MCU module is connected to a liquid crystal display module and a storage module, the MCU module is connected to an infrared communication module, a power-off detection module and an input detection module, and the liquid crystal display module displays corresponding power consumption information.

[0027] Specifically, the MCU module includes an MCU chip IC2 of model HT5015, and the MCU chip IC2 is equipped with an interface J4 and an interface J1. The HT5X1X series is a 128K MCU chip dedicated for multifunctional, high-performance, and low-power smart meters, which integrates units such as Cortex-M0 processor, metering unit, clock management, power management, hardware automatic temperature compensation RTC, PLL, high-frequency RC, low-frequency RC, LCD driver, etc., as well as NVIC and DEBUG debugging functions. Among them, the metering unit of the MCU module supports dual-loop current metering and single-loop voltage metering, and also supports working at 32.768 kHz, can work at extremely low power consumption, and is suitable for maintaining metering under small PT currents.

[0028] In depth, the power supply module uses a constant-voltage switching power supply chip with modular design. It not only has a small volume, large output power, and low output ripple, but also has a load short-circuit protection function. Specifically, it includes an AC power supply circuit, a system power supply circuit, a PT power supply circuit, and a module power supply circuit. Two output power supplies VIN and V2 are respectively supplied to the communication module, the MCU module, and other peripherals for operation.

[0029] Further, the AC power supply circuit includes a variable resistor unit RT1. The variable resistor unit RT1 is connected to a bridge DF1 through a voltage transformation unit U4. The bridge DF1 is connected to an AC-DC conversion chip IC8, a transformer T1, and an optocoupler U5; the system power supply circuit includes a voltage regulator chip IC6 and a voltage regulator chip IC7; the PT power supply circuit includes a power transformer IC12; the module power supply circuit includes a voltage regulator chip IC11. V2 is step-down by the DCDC module twice to output 3V9 for module power supply, with a larger and more stable output power. The PT power supply circuit passes through the zero-fire wire current through the power transformer IC12, and the secondary output supplies power to the MCU module for metering through the bridge DF1.

[0030] Even further, the sampling module includes a transformer sampling circuit, a shunt sampling circuit, and a voltage sampling circuit. The sampling module uses one shunt SHUNT and one CT sampling for two-loop current metering. At the same time, one-way AC voltage division sampling is performed, and after differential step-down, it is input to the MCU module. The MCU module provides full-wave and fundamental wave active electric energy. Within a dynamic range of 5000:1, the non-linear error is <0.1%, meeting the accuracy requirements of 0.5S and 0.2S class active energy meters.

[0031] In addition, the communication module includes a 4G communication chip of the EC200A model. The EC200A series is an LTE Cat4 wireless communication module designed by Quectel Wireless Solutions Co., Ltd. specifically for the M2M and IoT fields. It uses 3GPP Release 9 LTE technology and supports a maximum downlink rate of 150 Mbps and a maximum uplink rate of 50 Mbps. At the same time, it is backward compatible with GPRS, EDGE, and WCDMA to ensure normal operation in remote areas lacking 3G and 4G networks. The communication module has a GPRS chip IC1 and an optocoupler U2. The communication module also has a SIM chip IC3 and an isolation chip D2.

[0032] At the same time, the relay module includes a relay drive circuit and a relay feedback circuit. The relay drive circuit includes a drive chip IC10A, which is used to open and close the meter relay. It can automatically disconnect the relay in case of electricity theft or overload and restore it according to the actual function configuration. At the same time, it can also be remotely controlled. The relay feedback circuit includes an optocoupler U3, which is used to detect whether the relay output opening and closing are effective, avoid the relay opening and closing failure caused by external influences, perform secondary operations in case of feedback abnormalities, and give a communication alarm.

[0033] Visibly, the liquid crystal display module includes a segment LCD display screen and a drive chip LCD1. The segment LCD display screen is an 8COM×19SEG self-designed segment LCD display screen. Cooperating with the key input module, it can display various real-time measurement parameters and power consumption data of the meter.

[0034] Obviously, the storage module includes a FLASH memory IC5 and an EEP memory IC9. The FLASH memory IC5 and the EEP memory IC9 are equipped with data backup chips IC16 and IC4. The 4MB SPI FLASH memory IC5 and the 512KB EEP memory IC9 meet the large data storage requirements of the smart meter. Moreover, each has an additional data backup chip. When writing data, the same data is sequentially written into the main storage chip and the backup storage chip through chip selection to ensure the stability and reliability of the data.

[0035] Preferably, the infrared communication module includes an infrared emitter LED4 and an infrared receiver IR1. The input detection module includes a linear Hall sensor IC2 and a key switch SW1. The key switch SW1 can facilitate viewing the display data, IO input, magnetic field detection, cover opening detection, and power-off detection are used to record various events of the meter. The infrared communication module is used for local data setting and information printing.

[0036] In summary, the principle of this embodiment is as follows: The communication module supports LTE, GPRS, EDGE, and WCDMA, enabling users to perform meter reading without cabling. Meter reading can also be achieved in some remote areas without 4G signal coverage. The metering and external detection anti-stealing electricity module can continue to effectively measure under external reverse connection, open connection, bypass, and other conditions. At the same time, under external factors such as opening the cover and magnetic field, it can alarm to the cloud server through the 4G module.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although terms such as MCU module, power supply module, sampling module, etc. are used more frequently in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A single-phase multiple anti-stealing electric meter based on the DLMS protocol, including an MCU module, characterized in that, The described MCU module is connected to a power supply module, a sampling module, a communication module, a relay module, a liquid crystal display module, and a storage module. The MCU module is also connected to an infrared communication module, a power failure detection module, and an input detection module.

2. The single-phase multiple anti-stealing electric meter based on the DLMS protocol according to claim 1, wherein The MCU module includes an MCU chip IC2 of model HT5015, and the MCU chip IC2 is equipped with interface J4 and interface J1.

3. A single-phase multiple anti-theft electricity meter based on the DLMS protocol according to claim 1, characterized in that, The power supply module includes an AC power supply circuit, a system power supply circuit, a PT power supply circuit, and a module power supply circuit.

4. The single-phase multi-anti-theft electric meter based on the DLMS protocol according to claim 3, characterized in that, The AC power supply circuit includes a variable resistance unit RT1. The variable resistance unit RT1 is connected to a bridge DF1 through a voltage transformation unit U4. The bridge DF1 is connected to an AC-DC conversion chip IC8, a transformer T1, and an optocoupler U5. The system power supply circuit includes voltage regulator chips IC6 and IC7. The PT power supply circuit includes a power transformer IC12. The module power supply circuit includes a voltage regulator chip IC11.

5. A single-phase multiple anti-theft electric meter based on the DLMS protocol according to claim 1, characterized in that, The sampling module includes a current transformer sampling circuit, a shunt sampling circuit, and a voltage sampling circuit.

6. A single-phase multiple anti-theft electric meter based on the DLMS protocol according to claim 1, characterized in that, The communication module includes a 4G communication chip of model EC200A. The communication module has a GPRS chip IC1 and an optocoupler U2. The communication module also has a SIM chip IC3 and an isolation chip D2.

7. A single-phase multiple anti-theft electric meter based on the DLMS protocol according to claim 1, characterized in that, The relay module includes a relay drive circuit and a relay feedback circuit. The relay drive circuit includes a drive chip IC10A, and the relay feedback circuit includes an optocoupler U3.

8. A single-phase multiple anti-theft electricity meter based on the DLMS protocol according to claim 1, characterized in that, The liquid crystal display module includes a segment LCD display screen and a drive chip LCD1.

9. A single-phase multiple anti-theft electric meter based on the DLMS protocol according to claim 1, characterized in that, The storage module includes a FLASH memory IC5 and an EEP memory IC9. The FLASH memory IC5 and the EEP memory IC9 are equipped with data backup chips IC16 and IC4.

10. The single-phase multiple anti-theft electric meter based on the DLMS protocol according to claim 1, characterized in that, The infrared communication module includes an infrared emitter LED4 and an infrared receiver IR1. The input detection module includes a linear Hall sensor IC2 and a push-button switch SW1.

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