EEPROM data storage method and system for micro inverter

Abstract

The invention discloses an EEPROM (Electrically Erasable Programmable Read-Only Memory) data storage method for a micro inverter, which comprises the following steps of: dividing a storage area in an EEPROM into N storage units, circularly storing power generation capacity data obtained each time into the storage units in sequence, and storing a storage sequence number corresponding to each time of storage into the storage units; when the micro inverter is restarted after power failure, reading all the storage serial numbers, if M continuous effective storage serial numbers exist, obtaining the maximum effective storage serial number to serve as the effective storage serial number stored last time, wherein the generating capacity data corresponding to the maximum effective storage serial number is the data stored last time; and taking the next storage unit of the storage unit which is stored last time as a current storage unit, storing the current generating capacity data into the current storage unit, adding one to the effective storage serial number which is stored last time to obtain a current storage serial number corresponding to the current storage unit, and storing the current storage serial number into the current storage unit. According to the method and the system, the validity and the correctness of EEPROM data reading are ensured.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to an EEPROM data storage method and system of a micro-inverter. Background technique [0002] In the field of photovoltaic technology, micro-inverters need to obtain the power generation data of each photovoltaic module port. The processor of the micro-inverter is powered by photovoltaic panels. When the processor is powered off at night or under extremely weak light conditions, it will lose connection. Therefore, the micro-inverter needs to regularly monitor each photovoltaic module The power generation of the port is stored. In embedded control systems, EEPROM is generally used as a data storage chip, which has the characteristic that data will not be lost after power failure. Generally, the erasing and writing life of EEPROM is 1 million times, and the data will become easily lost after exceeding the erasing and writing life. In micro-inverters, some system and grid-conn...

AI Technical Summary

Problems solved by technology

Due to the power failure of the micro-inverter at night, the power-off time generally ranges from 8 to 12 hours. When the data retention time of the repeatedly erased area in the EEPROM drops to the power-off time, such as less than 8 hours, data failure occurs The probability will increase greatly, and the probability of failure will continue to increase with the increase in the number of erases and writes. Therefore, there will be a problem that the power generation data is verified correctly after being written, and the read data is wrong after power off and restarting, resulting in the failure of the power generation storage data.

Images