High-integration three-phase electric energy meter based on multimode communication metering SOC chip

Abstract

The invention relates to a high-integration three-phase electric energy meter based on a multimode communication metering SOC chip, and belongs to the field of electric meter metering. The electric energy meter comprises a chip, an external radio frequency antenna, an HPLC (High Performance Liquid Chromatography) line driving module, an Ethernet modulation-demodulation module and a signal acquisition module. A communication signal on a power line reaches the HPLC AFE through the coupling circuit and the filter, and is processed by the MCU after being demodulated. Three-phase voltage and current signals and zero line current signals are acquired and then reach an electric power metering ADC module, are quantized and then are sent to a DSP for processing, active power and reactive power are calculated and stored in an SRAM, and operation information, fault information and electric energy information of an electric meter are encrypted and then are sent out through Bluetooth or pass through HRF MACamp; and after being modulated by the PHY, the signal is sent out by the high-speed radio frequency transceiver, or after being modulated by the HPLC AFE module and amplified by the driving module, the signal is coupled to the power line by the coupling circuit.

Description

Technical Field

[0001] The invention belongs to the field of electric meter measurement, and relates to a highly integrated three-phase electric energy meter based on a multi-mode communication measurement SOC chip. Background Art

[0002] In the context of the rapid development of smart grids today, the optimization and reliability of the communication function of three-phase energy meters, as key metering and monitoring equipment in power systems, is crucial. At present, in order to meet the communication needs of three-phase energy meters, the industry generally adopts a solution that combines independent chips with HPLC and HRF functions. Through these chips, three-phase energy meters can transmit data through power lines and wireless frequency bands, meeting the functional requirements of remote data interaction and station area identification. However, this solution has exposed many defects in practical applications that need to be solved. First of all, the working environment of three-phase energy meters is often very harsh. They are mostly deployed in places such as construction sites, industrial plants and distribution rooms, with extremely strong electromagnetic interference and mechanical vibration. Due to the limited shielding ability of independent chips, their communication performance is easily affected in a strong electromagnetic environment, and data transmission errors and interruptions frequently occur, which seriously affects the accurate and timely reporting of metering data of energy meters. Secondly, this independent chip combination design makes the printed circuit board (PCB) area of ​​the energy meter larger, because each chip requires supporting peripheral circuits for power supply, signal conditioning and other support. Many components are arranged on the PCB, which not only takes up a lot of space, but is not conducive to the miniaturization design of the energy meter, but also increases the production cost. The existing solutions lack convenient local short-range wireless communication methods and cannot meet the user's needs for quick query and control of the energy meter in close-range scenarios. For example, when users want to view electricity usage details and make simple settings near the meter, there is no suitable short-range communication method, which brings great inconvenience to users. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a highly integrated three-phase electric energy meter based on a multi-mode communication metering SOC chip, which integrates the multi-mode communication modes (Bluetooth, HRF, HPLC) and MCU in one SOC, reduces the area of ​​the meter PCB board and improves the reliability of the meter system; and also adds data encryption function to protect user data security.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A highly integrated three-phase electric energy meter based on a multi-mode communication metering SOC chip comprises an XL9051 SOC chip, and an externally connected radio frequency antenna, an HPLC line driver module, an Ethernet modulation and demodulation 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).

[0006] The XL9051 SOC chip integrates HRF (High-speed Radio Frequency), HPLC (High-speed Power Line Carrier Communication), Bluetooth, data encryption and decryption modules and MCU. HRF has high-speed and stable data transmission capabilities, and can be networked in combination with HPLC to improve the communication capabilities of the meter and greatly improve the stability of meter reading. The Bluetooth module gives the meter the ability to communicate with smart devices locally at close range. The data encryption and decryption module ensures the data security of the smart meter equipped with this chip. Integrating the above functions in a SOC chip facilitates meter design.

[0007] The XL9051 SOC chip includes MCU, ETH MAC, DSP module, encryption and decryption and chip ID storage module (Encryption and decryption&eFuse), Bluetooth module, HRF MAC&PHY, high-speed RF transceiver, HPLCMAC, HPLC AFE, SRAM, 7 power metering ADC modules 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 address and interface, DSP is a digital signal processing unit, responsible for various algorithm implementations; HRF MAC&PHY represents high-speed wireless channel physical address and physical hierarchy; SRAM represents static random access memory; HPLC MAC represents broadband power line carrier physical address, HPLCAFE represents broadband power line carrier analog front end;

[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, 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 over 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 electric energy 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 and quantized by the ADC of the HPLC AFE modem, it reaches the MCU for processing. The three-phase voltage and current and the neutral current signals are sent to the 7 power measurement ADC modules respectively after passing through the voltage and current signal acquisition module. After being quantized, they are sent to the DSP 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 electric energy information of the meter are encrypted and decrypted by the encryption and decryption and chip ID storage module. Under the control of the MCU, the information is transmitted locally via Bluetooth, or sent out through the high-speed RF transceiver (HRF Transceiver) after being modulated by the HRF MAC&PHY, or modulated and converted by the DAC of the HPLC AFE modem, and then amplified by the driver module and coupled to the power line by the coupling circuit.

[0011] 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.

[0012] 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).

[0013] 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.

[0014] 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.

[0015] The beneficial effects of the present invention are:

[0016] 1) The present invention realizes multi-mode communication of the electric energy meter, and adopts a communication method integrating Bluetooth, HRF and HPLC, so that the communication of the electric energy meter is more stable and reliable, the environmental adaptability of the electric energy meter is enhanced, and the interconnection between the three-phase electric energy meter and the industrial intelligent equipment is realized.

[0017] 2) The data encryption and decryption module used in the electric energy meter of the present invention supports multiple encryption algorithms, thereby improving data security and protecting user privacy.

[0018] 3) The electric energy metering SOC chip integrated in the present invention reduces the size of the electric energy meter, increases the reliability of the electric energy meter, and reduces the overall power consumption of the electric energy meter.

[0019] 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

[0020] 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:

[0021] Figure 1 The functional structure and logic layout of the XL9051 SOC chip designed for the present invention;

[0022] Figure 2 This is a functional diagram of a three-phase electric energy meter implemented by the XL9051 SOC chip;

[0023] Figure 3 It is the functional structure diagram of HPLC;

[0024] Figure 4 A schematic diagram of a network of HPLC and HRF. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] See also Figure 1 to Figure 4 The present invention discloses a design scheme for a three-phase smart meter based on a multi-mode communication metering SOC chip. The XL9051 SOC chip designed by the present invention integrates HRF, HPLC, Bluetooth module, data encryption and other modules. The logical layout of the main functions of the entire chip is as follows Figure 1 As shown in the figure. The XL9051 SOC chip integrates all the above functions into one SOC chip, realizing the high integration of the power metering chip. The electric energy meter can be realized by only connecting the external RF antenna, HPLC line driver, Ethernet modulation and demodulation module ETH PHY) and signal acquisition module. It not only reduces the PCB board of the electric energy meter, but also improves the reliability of the designed electric energy meter. The signal acquisition module includes a coupling circuit, a voltage and current signal acquisition module and a filter (BPF).

[0029] The XL9051 SOC chip integrates HRF (high-speed wireless communication), HPLC (broadband power line carrier communication), Bluetooth, data encryption module and MCU. HRF has high-speed and stable data transmission capabilities, and can be networked in combination with HPLC, improving the communication capabilities of the meter and greatly improving the stability of meter reading. The Bluetooth module gives the meter the ability to communicate with smart devices locally at close range. The data encryption module ensures the data security of the smart meter equipped with this chip, and integrating the above functions into a SOC chip makes it easier to design the meter. Not only does it reduce the PCB board of the meter, but it also improves the reliability of the designed meter.

[0030] Figure 1The 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 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 (Encryption and decryption&eFuse), a Bluetooth module, a high-speed wireless channel modulation (HRF MAC&PHY), a high-speed RF transceiver (HRF Transceiver), an interface controller (SPC), a serial PLASH interface controller (SFC), a non-volatile flash memory (Nor Flash), a static random access memory (SRAM), 7 power metering ADC modules, a broadband power line carrier physical address (HPLC MAC), a broadband power line carrier analog front end (HPLC AFE), UART (universal asynchronous receiver and transmitter), SPI, I2C communication protocols, and pulse width modulation (PWM). Among them, the MCU communicates with the ETH MAC, DSP, DMA, encryption and decryption and chip ID storage module, Bluetooth module, HRF MAC&PHY, and high-speed RF transceiver through the APB bus. In addition, the SFC, non-volatile flash memory module, SRAM, ADC, HPLC MAC and HPLC AFE are also controlled by the APB bus. The SPC is controlled by the APB bus and communicates with the off-chip PSRAM through 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 general IO ports. The meter's power information and some configuration information are stored in the non-volatile flash memory.

[0031] 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 a high-speed RF 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.

[0032] The functional diagram of the three-phase energy meter realized by XL9051 is as follows Figure 2As shown, take the three-phase four-wire system as an example. The configuration information and electric energy 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. The signal is demodulated by the modem of the HPLC AFE and quantized by the ADC before reaching the MCU for processing. The three-phase voltage and current and the neutral current signals pass through the voltage and current signal acquisition module and reach the seven power metering ADC modules. After quantization, they reach 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 electric energy information of the meter are encrypted by the encryption and decryption and chip ID storage modules. Under the control of the MCU, the information is transmitted locally via Bluetooth, or sent out through the high-speed RF transceiver after being modulated by the HRF MAC&PHY, or modulated and converted by the DAC of the HPLC AFE modem, and then amplified by the driver module and coupled to the power line by the coupling circuit. All of these are completed stably and reliably under the control of the MCU inside the XL9051SOC chip.

[0033] The Bluetooth module uses BLE5.2+2.4GHz (private protocol), which meets the technical requirements of the State Grid and Southern Grid for Bluetooth meter calibration and meter inspection. The Bluetooth module enables the electric energy meter to be closely connected with other smart devices. The integrated HRF module has a receiving sensitivity lower than -110dBm, and the bandwidth is optional, with a maximum transmission rate of 1Mbps.

[0034] The HPLC functional structure diagram designed by the present invention is as follows Figure 3 As shown. The specific processing flow is: 1) In the input processing circuit, filter out the low-frequency noise in the HPLC signal; 2) Filter out the high-frequency noise through the high-pass filter; 3) Finally, amplify the overall circuit signal through the power amplifier circuit and transmit it to the coupling module; 4) The coupling module couples the HPLC signal to the power line. Under the premise of ensuring that the circuit meets the design, the circuit performance is improved. Finally, HPLC can adaptively support multiple working frequency bands, adopt OFDM technology, support DBPSK, BPSK, QPSK, 16QAM modulation modes, support FEC (Turbo / Viterbi / RS) and CRC functions, and has powerful denoising and error correction capabilities.

[0035] The XL9051 SOC chip also has a built-in cryptographic algorithm hardware acceleration engine. It supports multiple encryption algorithms such as AES, DES, SHA, SM1, SM3, SM4, SM7, and MD5. It also has Flash storage encryption. TRNG true random number generator. It supports secure boot, program encryption download, and secure update to ensure user data security. In addition, HRF and HPLC can perform dual-channel, dual-mode hybrid routing mechanisms, automatic networking, and automatic routing without manual intervention. Figure 4 The schematic diagram of HPLC and HRF networking is shown in Figure 2. In the initial stage of building the network topology, each electric energy meter is an independent node ( Figure 4 Nodes 1, 2, 3, 4, 5, and 6 are used as an illustration, and each node corresponds to an electric energy meter). The two communication methods of HRF and HPLC are fully utilized to broadcast their own location information to the outside, so as to accurately explore adjacent nodes and build a connection network. The electric energy meter using the XL9051 SOC chip also supports wired and wireless dual-transmit and dual-receive communication mechanisms, that is, through the wired and HRF methods of HPLC. By integrating the two methods of wired and wireless communication, the advantages of the two communications can be fully utilized, while complementing each other's shortcomings, and integrating wired and wireless into a hybrid multi-level jump network, which can achieve indoor and outdoor signal coverage and reliable communication without blind spots. The chip can support a variety of modulation and demodulation methods, support various networking methods, and meet most of the IoT application scenarios.

[0036] 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. A highly integrated three-phase electric energy meter based on a multi-mode communication metering SOC chip, 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, SRAM, 7 power metering ADC modules and non-volatile flash memory module; the HPLC AFE includes a modem, ADC and DAC; wherein ETH MAC represents Ethernet physical address and interface, DSP represents digital signal processing unit; HRF MAC&PHY represents high-speed wireless channel physical address and physical hierarchy; SRAM represents static random access memory; HPLC MAC represents broadband power line carrier physical address, and HPLC AFE represents broadband power line carrier analog front end; 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, 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 of the meter are stored in the non-volatile flash memory module. The communication signal on the power line passes through the coupling circuit and then 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 three-phase voltage and current and the neutral current signals pass through the voltage and current signal acquisition module and reach the 7 power metering ADC modules. 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 meter are encrypted by the encryption and decryption and chip ID storage modules, and then transmitted locally through Bluetooth 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 HPLC AFE modem, and then amplified by the driver module and coupled to the power line by the coupling circuit.

2. The highly integrated three-phase electric energy meter according to claim 1, 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 highly integrated three-phase electric energy meter according to claim 1, 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 highly integrated three-phase electric energy meter according to claim 1, 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 highly integrated three-phase electric energy meter according to claim 1, 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.

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