Analysis of User Smart Meter Data Storage Technology

The user smart meter is a kind of power data acquisition instrument composed of MCU as the core and a large-scale power collection module. It has multi-user power collection, data remote transmission, user power supply control, multi-rate electricity measurement and other advanced features, small size With strong functions, it is deeply welcomed by users of centralized power supply places such as college student residence halls and intelligent communities. In order to increase the flexibility of instrument use, there are some programmable parameters, such as instrument number, metering number, communication rate, meter pulse constant, multi-rate time value, power supply status of each household, and their measured data. The power consumption of each user. Once these data are destroyed by interference, not only the instrument can not work properly, but also cause economic losses to the user and cause economic disputes. Therefore, the reliability, safety, and non-volatile nature of the data must be ensured.

The power consumption of each user is converted into a pulse proportional to the amount of electricity by a large-scale energy metering integrated circuit (eg, BL0933, ADE7755, etc.). After the photoelectric coupling circuit, the digital input interface is used by the CPU in the memory. The CPU accumulates the power consumption of each user according to the collected pulse amount, stores it in a non-volatile memory, and displays the power consumption of each household in turn by the display circuit. Remote transmission of measurement data via remote communication interface circuits (eg RS485, CAN bus).

In order to improve the reliability of the instrument, an optoelectronic isolation circuit was designed in both the data acquisition circuit and the remote transmission circuit. An independent watchdog circuit consisting of an X5045 chip was designed to achieve non-volatile storage of parameters and data. Two types of memory are used, one is the 512-byte non-volatile memory inside the X5045; the other is a non-volatile memory W24C16 that interfaces directly with the CPU. The two types of memory cooperate with each other and are equipped with software measures to realize non-volatile and highly reliable data storage.