Electric energy meter based on SOC chip integrated with Beidou positioning navigation and time service functions

Abstract

The invention relates to an electric energy meter based on an SOC chip integrating Beidou positioning navigation and time service functions, and belongs to the field of electric meter metering. The electric energy meter comprises an XL9051SOC chip, and a radio frequency antenna, an HPLC line driving module, an Ethernet modulation-demodulation module and a signal acquisition module which are externally connected with the XL9051SOC chip. The XL9051 SOC chip integrates the Beidou positioning and time service functions, the HRF, the HPLC, the Bluetooth, the data encryption module and the MCU into the same SOC chip. The communication capability of the electric energy meter is guaranteed by HPLC, HRF and Bluetooth, the data security of the electric energy meter is guaranteed by the data encryption module, the intelligent electric meter carrying the chip is more convenient to search in daily management and maintenance due to the Beidou navigation positioning and time service functions, the cooperative work capability among the electric meters is enhanced due to accurate time service, and the intelligent power grid management requirement is better met.

Description

Technical Field

[0001] The invention belongs to the field of electric meter measurement, and relates to an electric energy meter based on a SOC chip with integrated Beidou positioning navigation and timing functions. Background Art

[0002] With the development of smart grids, the requirements for the positioning and timing errors of electric energy meters are gradually increasing. At present, the positioning of electric energy meters generally adopts the method of binding the electric energy meter with the physical address of the resident, or using HPLC (Broadband Power Line Communication) to collect address information, import it into the concentrator for processing and then positioning. These methods have inaccurate positioning, especially in large communities and complex buildings, and also in the wild. This reduces the work efficiency of the operation and maintenance personnel in the process of intelligent management and daily operation and maintenance of electric meters. Therefore, accurate positioning function is imminent, which can quickly guide the operation and maintenance personnel to arrive at the site, handle faults and replace equipment in time, and ensure the stability of power supply.

[0003] On the other hand, the operation of modern power grids is highly dependent on accurate time synchronization. Many key operations such as time-of-use electricity price strategies, load monitoring and control, and meter reading information synchronization require the energy meter and concentrator to have accurate timing capabilities to ensure the timeliness and accuracy of data collection and operation execution. At present, some energy meters use high-precision clock sources to ensure clock synchronization, but the timing error of this method will increase over time. Some meters have also tried to introduce Beidou positioning navigation and timing functions, but most of them are designed with Beidou positioning modules. This solution brings many disadvantages: the use of Beidou positioning modules increases the PCB area of ​​the energy meter, and the wiring and design are more complicated, which is not conducive to miniaturization. In the power environment with strong electromagnetic interference, it is easy to have stability problems such as signal transmission interruption and timing deviation. In addition, each module operates independently, power consumption management is difficult, resulting in short battery life, and high cost. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an electric energy meter based on a SOC chip with integrated Beidou positioning, navigation and timing functions, integrating Beidou positioning and timing and HRF (high-speed wireless communication, High-speed Radio Frequency), HPLC, Bluetooth, data encryption module and MCU into the same SOC chip to solve the shortcomings of traditional electric energy meters in power operation and maintenance management and precise time synchronization, meet the comprehensive requirements of modern smart grids for electric energy meters with multi-functions, high reliability, miniaturization and low cost, and improve the operating efficiency and intelligence level of the power system.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An electric energy meter based on a SOC chip with integrated Beidou positioning navigation and timing functions, comprising an XL9051 SOC chip, and an externally connected radio frequency antenna, an HPLC line driver module, an Ethernet modem module (ETH PHY) and a signal acquisition module; the signal acquisition module comprises a coupling circuit, a voltage and current signal acquisition module and a filter (BPF);

[0007] The XL9051 SOC chip includes MCU, ETH MAC, DSP module, encryption and decryption and chip ID storage module, Bluetooth module, HRF MAC&PHY, high-speed RF transceiver, HPLC MAC, HPLC AFE, BDS, SRAM, power metering ADC module and non-volatile flash memory (Nor Flash) module; the HPLC AFE includes ADC (analog-to-digital converter), modem and DAC (digital-to-analog converter); wherein ETH MAC represents Ethernet physical address and interface, DSP represents digital signal processing unit; HRFMAC&PHY represents high-speed wireless channel physical address and physical hierarchy; HPLC MAC represents broadband power line carrier physical address, HPLC AFE represents broadband power line carrier analog front end; BDS represents Beidou navigation module; SRAM represents static random access memory;

[0008] The MCU communicates with the ETH MAC, DSP, encryption and decryption and chip ID storage module, Bluetooth module, HRF MAC&PHY, high-speed RF transceiver, HPLC MAC, HPLC AFE, BDS, power metering ADC module and SRAM through the APB bus; the Ethernet modem module (ETH PHY) is connected to the ETH MAC, and is used to modulate the internal digital signal into an optical signal that is easy to transmit on the Ethernet, or demodulate the optical signal in the optical fiber into a digital signal that can be processed by the system;

[0009] The ETH MAC is mainly used for networking; the DSP module is used to implement various algorithms; and the MCU is responsible for controlling the normal operation of the entire chip.

[0010] The configuration information and power information of the meter are stored in the non-volatile flash memory (Nor Flash) module. The communication signal on the power line passes through the coupling circuit and then passes through the filter (BPF) to reach the HPLC AFE. After being demodulated by the HPLC AFE modem and quantized by ADC, it reaches the MCU for processing. The voltage and current signals are sent to the power metering ADC module after passing through the voltage and current signal acquisition module. After being quantized, they are sent to the DSP module for processing. The key information such as active power and reactive power is calculated and stored in the SRAM. The operation information, fault information and power information of the meter are encrypted by the encryption and decryption and chip ID storage module, and then sent out through the Bluetooth module under the control of the MCU, or sent out through the high-speed RF transceiver (HRF Transceiver) after being modulated by HRF MAC&PHY, or converted by the HPLC AFE modem and DAC, and then amplified by the driver module and coupled to the power line by the coupling circuit.

[0011] Beidou satellite information passes through the BDS dedicated antenna, then is filtered and reaches a high-performance ADC. After passing through the ADC, it becomes a digital signal, and finally is processed in the Beidou navigation and positioning core module (BDS Core) and communicates with the MCU, so that the meter obtains location information and time information.

[0012] Preferably, the XL9051 SOC chip also includes DMA, which communicates with the MCU via an APB bus; wherein DMA represents a direct memory access module.

[0013] Preferably, the XL9051 SOC chip further includes UART (Universal Asynchronous Receiver / Transmitter), SPI, I2C and PWM modulation, is controlled by the APB bus, and communicates with external components through a general IO port (such as GPIO MUX).

[0014] Preferably, the XL9051 SOC chip further includes an SPC, which is controlled by an APB bus and communicates with an off-chip PSRAM via QSPI; wherein SPC represents an interface controller; and PSRAM represents a pseudo-static random access memory.

[0015] Preferably, the XL9051 SOC chip further includes an SFC, which is controlled by an APB bus and is used to control a non-volatile flash memory (Nor Flash) module; wherein SFC represents a serial PLASH interface controller.

[0016] Preferably, the BDS shares a power management strategy with other functional modules, and accurately controls the power consumption status of each functional module through intelligent low-power mode switching and a collaborative working mechanism; specifically, during non-positioning demand periods, such as when the electric energy meter is in the regular metering stage, the Beidou module power consumption can be automatically reduced or even put into a sleep state, thereby effectively reducing the energy consumption of the entire electric energy meter, extending the service life of battery-powered electric energy meters, and reducing the problem of increased operation and maintenance costs caused by frequent battery replacement.

[0017] The beneficial effects of the present invention are: the electric energy meter of the present invention integrates Beidou positioning and timing, HRF, HPLC, Bluetooth, data encryption module and MCU into the same SOC chip, which can improve the miniaturization and integration of the electric energy meter, optimize power consumption, enhance system stability, improve anti-electromagnetic interference capability, synergize functions and reduce control costs. HPLC, HRF and Bluetooth guarantee the communication capability of the electric energy meter, the data encryption module guarantees the data security of the electric energy meter, the Beidou navigation positioning and timing function makes it easier to find the smart meter equipped with this chip in daily management and maintenance, and the precise timing makes the collaborative working ability between the electric meters stronger.

[0018] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 The functional structure and logic layout of the XL9051 SOC chip designed for the present invention;

[0021] Figure 2 Schematic diagram of the Beidou core functions of the XL9051SOC chip designed for the present invention. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1-2 The present invention provides an electric energy meter based on a SOC chip with integrated Beidou positioning navigation and timing functions, including an independently developed XL9051 SOC chip, and an externally connected radio frequency antenna, an HPLC line driver module, an Ethernet modem module (ETH PHY) and a signal acquisition module. The signal acquisition module includes a coupling circuit, a voltage and current signal acquisition module and a filter (BPF).

[0026] The XL9051 SOC chip integrates Beidou positioning and timing functions, HRF (high-speed wireless communication), HPLC (broadband power line carrier communication), Bluetooth, data encryption module and MCU into the same SOC chip. HPLC, HRF and Bluetooth ensure the communication capability of the energy meter, the data encryption module ensures the data security of the energy meter, and the Beidou navigation positioning and timing functions make it easier to find smart meters equipped with this chip in daily management and maintenance, and the precise timing makes the collaborative working ability between meters stronger.

[0027] Figure 1 The dotted box shows the functional structure of the XL9051 SOC chip, and the peripherals are the necessary components to realize its functions. The XL9051 SOC chip integrates the Beidou positioning navigation and timing functions into the SOC chip, reducing the use of external independent positioning modules and related peripheral circuits, greatly simplifying the internal structure of the energy meter, and effectively reducing the PCB size of the energy meter, so that it can adapt to a smaller installation space, facilitate deployment in various complex environments, and improve the versatility and adaptability of the energy meter. Figure 1 As shown, the XL9051 SOC chip includes an Ethernet interface (ETH MAC), a DSP (digital signal processing algorithm implementation module), an MCU, an encryption and decryption and chip ID storage module, a Bluetooth module, a high-speed wireless channel modulation (HRF MAC&PHY), a high-speed RF transceiver, an interface controller (SPC), a serial PLASH interface controller (SFC), a non-volatile flash memory (Nor Flash), a BDS, a static random access memory (SRAM), an electric power metering ADC module, a broadband power line carrier physical address (HPLC MAC), a broadband power line carrier analog front end (HPLC AFE), a UART (universal asynchronous receiver and transmitter), SPI, an I2C communication protocol, and a pulse width modulation (PWM). Among them, the MCU communicates with the ETH MAC, DSP, DMA, encryption and decryption and chip ID storage module, the Bluetooth module, the HRF MAC&PHY, the high-speed RF transceiver, and the BDS through the APB bus. In addition, the SFC, the non-volatile flash memory module, the SRAM, the ADC, the HPLC MAC, and the HPLC AFE are also controlled through the APB bus. The SPC is controlled by the APB bus and communicates with the PSRAM outside the chip through the QSPI. The SFC is controlled by the APB bus and is used to control the non-volatile flash memory module. In addition, the UART, SPI, I2C communication protocols and PWM modulation are controlled by the APB bus. The XL9051 uses UART, SPI, I2C and PWM modulation to communicate with external components through the general IO port. The meter's power information and some configuration information are stored in the non-volatile flash memory.

[0028] ETH MAC is mainly used for networking, the DSP module implements various algorithms, and the MCU is responsible for controlling the normal operation of the entire chip. Under the control of the MCU, the information is sent through Bluetooth or through the RF high-speed radio frequency transceiver after being modulated by HRF MAC&PHY. It can also be modulated by HPLC AFE and amplified by the driver module, and finally coupled to the power line by the coupling circuit.

[0029] Figure 2 This is a schematic diagram of the solution for implementing an electric energy meter using the XL9051 SOC. Figure 2Several core functional modules are shown in the figure, including SRAM for storing information, HPLC and HRF for communication and Bluetooth, Nor Flash for storing configuration information and electric energy of the meter, electric energy metering ADC and electric energy metering unit (DSP) for quantizing voltage and current, encryption and decryption and chip ID storage module, and Beidou functional module for receiving Beidou positioning navigation and timing information. The communication signal on the power line passes through the coupling circuit and then passes through the filter (BPF) to reach the HPLC AFE. The signal is demodulated and quantized by the ADC of the HPLC AFE before reaching the MCU module for processing. The voltage and current signals are collected and then reach the power metering ADC module. The key information such as active power and reactive power calculated by the DSP module is stored in the SRAM. The operation information, fault information and electric energy information of the meter are encrypted by the encryption and decryption module, and can be sent to the antenna through HRF modulation and then sent through the wireless transceiver, or modulated by the HPLC AFE and amplified by the driver module and coupled to the power line by the coupling circuit. Local transmission can also be carried out through Bluetooth. Beidou satellite information passes through the dedicated antenna of the Beidou functional module, and then reaches the high-performance ADC after filtering. After passing through the ADC, it becomes a digital signal, and finally processed in the Beidou navigation and positioning core module (BDSCore) and communicates with the MCU, so that the meter can obtain location information and time information. Compared with the way of realizing the positioning and navigation functions by combining independent chips, the Beidou functional module integrated in the SOC chip can share the power management strategy with other functional modules, and accurately control the power consumption of each functional module through intelligent low-power mode switching and collaborative working mechanism. During non-positioning demand periods, such as when the electric energy meter is in the regular metering stage, the power consumption of the Beidou module can be automatically reduced or even put into a dormant state, thereby effectively reducing the energy consumption of the entire electric energy meter, extending the service life of battery-powered electric energy meters, and reducing the increase in operation and maintenance costs caused by frequent battery replacement.

[0030] Because it is integrated inside the SOC, the area of ​​the PCB board and the routing issues are reduced. Therefore, the integrated Beidou module greatly reduces the risk of failure caused by mechanical vibration, loose lines, poor contact, etc. compared to independent module integration. The strict design of the SOC chip ensures the compatibility and coordinated stability of the Beidou positioning and navigation function with other core functions such as electricity metering and communication, ensuring the stable output of positioning and navigation information in complex and changeable power working environments, such as strong electromagnetic radiation areas in industrial plants and harsh outdoor weather conditions, providing reliable support for power operation and maintenance.

[0031] When designing the SOC chip, the electrical compatibility between modules is fully considered, and the electromagnetic shielding design and advanced packaging technology are used to place the Beidou positioning and navigation functions under strict protection to protect them from strong external electromagnetic interference. In places with extremely complex electromagnetic environments such as substations and high-voltage distribution rooms, Beidou satellite signals can still be accurately received to achieve stable positioning and accurate timing, effectively improving the working performance of the energy meter in harsh electromagnetic environments and ensuring the accuracy of power data collection and transmission.

[0032] Under the SOC chip architecture, the Beidou positioning and navigation function can be deeply integrated and coordinated with other functions of the energy meter. For example, the communication mode of the energy meter can be intelligently adjusted based on the positioning information, and the backup communication link can be enabled first in remote mountainous areas or signal-blocked areas. In addition, with the help of precise timing synchronization, the metering data collection, storage and reporting cycle of the energy meter can be accurately matched with the power grid system time, improve the accuracy of time-of-use electricity price measurement, improve the operating efficiency of the entire energy meter system, and assist in the intelligent management of the power grid.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. An electric energy meter based on a SOC chip with integrated Beidou positioning navigation and timing functions, characterized in that: The electric energy meter includes an XL9051 SOC chip, and an external radio frequency antenna, an HPLC line driver module, an Ethernet modulation and demodulation module and a signal acquisition module; the signal acquisition module includes a coupling circuit, a voltage and current signal acquisition module and a filter; The XL9051 SOC chip includes MCU, ETH MAC, DSP module, encryption and decryption and chip ID storage module, Bluetooth module, HRF MAC&PHY, high-speed RF transceiver, HPLC MAC, HPLC AFE, BDS, SRAM, power metering ADC module and non-volatile flash memory module; the HPLC AFE includes a modem, ADC and DAC; wherein ETH MAC represents the Ethernet physical address and interface, DSP represents the digital signal processing unit; HRF MAC&PHY represents the high-speed wireless channel physical address and physical hierarchy; HPLC MAC represents the broadband power line carrier physical address, HPLC AFE represents the broadband power line carrier analog front end; BDS represents the Beidou navigation module; SRAM represents the static random access memory; The MCU communicates with the ETH MAC, DSP, encryption and decryption and chip ID storage module, Bluetooth module, HRF MAC&PHY, high-speed RF transceiver, HPLC MAC, HPLC AFE, BDS, power metering ADC module and SRAM through the APB bus; the Ethernet modem module is connected to the ETH MAC to modulate the internal digital signal into an optical signal that is easy to transmit over Ethernet, or to demodulate the optical signal in the optical fiber into a digital signal that can be processed by the system; The configuration information and electric energy information of the electric meter are stored in the non-volatile flash memory module. The signal on the power line passes through the coupling circuit and then passes through the filter to reach the HPLC AFE. The signal is demodulated by the modem of the HPLC AFE and quantized by the ADC before reaching the MCU for processing. The voltage and current signals pass through the voltage and current signal acquisition module and reach the power measurement ADC module. After being quantized, they are sent to the DSP module for processing. The active power and reactive power are calculated and stored in the SRAM. The operation information, fault information and electric energy information of the electric meter are encrypted by the encryption and decryption and chip ID storage modules, and then sent out through the Bluetooth module under the control of the MCU, or sent out through the high-speed RF transceiver after being modulated by the HRF MAC&PHY, or modulated and converted by the DAC modem of the HPLCAFE, and then amplified by the driver module and coupled to the power line by the coupling circuit. Beidou satellite information passes through the BDS dedicated antenna, then is filtered and reaches the ADC. After passing through the ADC, it becomes a digital signal, and finally is processed in the Beidou navigation and positioning core module and communicates with the MCU, so that the meter obtains location information and time information.

2. The electric energy meter based on the SOC chip with integrated Beidou positioning navigation and timing functions according to claim 1 is characterized in that: The XL9051 SOC chip also includes a DMA, which communicates with the MCU via an APB bus; wherein DMA represents a direct memory access module.

3. The electric energy meter based on the SOC chip with integrated Beidou positioning navigation and timing functions according to claim 1 is characterized in that: The XL9051 SOC chip also includes UART, SPI, I2C and PWM modulation, is controlled by the APB bus, and communicates with external components through a general IO port.

4. The electric energy meter based on the SOC chip with integrated Beidou positioning navigation and timing functions according to claim 1 is characterized in that: The XL9051 SOC chip also includes an SPC, which is controlled by an APB bus and communicates with an off-chip PSRAM through QSPI; wherein SPC represents an interface controller; and PSRAM represents a pseudo-static random access memory.

5. The electric energy meter based on the SOC chip with integrated Beidou positioning navigation and timing functions according to claim 1 is characterized in that: The XL9051 SOC chip also includes an SFC, which is controlled by the APB bus and is used to control the non-volatile flash memory module; wherein SFC represents a serial PLASH interface controller.

6. The electric energy meter based on the SOC chip with integrated Beidou positioning navigation and timing functions according to claim 1 is characterized in that: The BDS shares power management strategies with other functional modules, and accurately controls the power consumption of each functional module through intelligent low-power mode switching and collaborative working mechanisms; specifically, during periods of non-positioning requirements, the power consumption of the Beidou module is automatically reduced or even put into sleep mode.

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