Research And Implementation Of Key Software Technology For Productization Of High Precision Power Analyzer

With the development of signal processing and computer technology,human society has entered the digital age.As a product of the digital age,the power analyzer combining with the power meter and computer technology achieves the measurement of voltage,current,power,harmonic and other signals.It plays an important role in all fields of the electronic industry.Although the technical research of power analyzer in China has been gradually mature,it is still lacking in the aspects of marketization and productization,so it is difficult to put it into the market and give full play to its effect.In order to realize the marketization and productization of the power analyzer,it is necessary to design relevant functions in the aspects of practicability,stability,economy and expansibility.Therefore,this paper researches the following key technologies in the productization process of power analyzer,proposes a reasonable solution,and completes the design and implementation of related technologies:1.Automatic calibration of voltage and current channels.This paper analyzes the error sources in the measurement of voltage and current,and designs the offset calibration and gain calibration process for the channel offset error and channel gain error,so as to realize the high-precision measurement of voltage and current.2.Calibration of power amount.The accuracy of the power amount depends on the accuracy of the voltage and current themselves and the phase measurement accuracy of them.This paper analyzes the phase errors caused by the hardware circuit,ADC and the current sensor.The pulse comparison method and clock chip synchronization method are designed to calibrate the phase error in hardware circuit and ADC sampling.As for the phase errors generated by the current sensor,established phase-frequency characteristic curves of the current sensor through different schemes,to dynamically compensate the signals of different frequencies,and finally realize the accurate measurement of the power amount.3.Power analyzer embedded system customization.In order to reduce the configuration requirements of the power analyzer and optimize the operating system,this paper completed the customization of the kernel layer and application layer of WES7 system based on the ICE tool,so as to enhance system performance and reduce resource consumption.Besides,the embedded functions such as registry protection and shell customization are designed.In combination with EWF and FBWF technologies,the write protection process that does not affect the system software functions is designed to ensure the security and stability of the system.4.Power analyzer software system upgrade.This paper designs the software system USB offline update program and online networking update program,and realizes the system upgrade under different scenarios.Besides,the USB upgrade program of FPGA firmware is designed and the FPGA firmware upgrade function is realized.5.Functional testing and validation.The voltage and current channel and the power amount were tested before and after calibration,and the voltage and current measure reached the accuracy of 0.02% range + 0.01% reading and the power amount measure reached the accuracy of 0.05% range.The basic functions,write protection,software upgrade and firmware upgrade of the customized system were tested,which all met the expected requirements.