Design Of Three-phase Electronic Multi-function Energy Meter Based On USB Host Technology

Different Power Metering field demands different measurement methods and communication interface. The selection of power meter reading and communication interface depends on characteristics of the physical environment, the users' action of using electricity, the rank of techniques, management structure, investment costs and so on. In this paper, a three-phase electronic multi-function meter is designed for users with mass data transmission and scattered distribution of electric energy meter, while automatic meter reading system is not suitable for them. Based on the USB Host technical design, this three-phase electronic multi-function meter realized the function of harmonic analysis and harmonic measurement, it is not only high accuracy and low power consumption, but also has the function of divided periods measurement to improve the power grid efficiency and achieve peak-hour valley purpose. This three-phase electronic multi-function meter based on USB Host technique provide the users with USB interface, users may use U-disk for setting power meter operating parameters, and reading power load curve data and energy data, it is convenient for spot meter reading, and it is much useful for avoiding manual error.This paper first reviews the development of electric energy meter, power meter reading methods, the demand and development of electric meter communication interface. The development and application of USB technique, and the significance of USB Host technique application in electric meter is discussed. The principle and working flow of three-phase electronic meter is introduced, and the realization of electric energy measurement algorithm and hardware design, as well as the principles and function of this meter's management, power and communication modules is described. The basic principle of USB Host technique and file system is discussed, a new structure of three-phase electric multi-function meter based on USB Host technique is put forward, it focused on hardware, software and EMC design of USB Host interface unit, and the way that the meter file reading, file writing, file deleting, and file modification in U-disk based USB Host technique is discussed. The anti-disturbance and low power consumption design of electric meter is explored. The measurement checking and function inspection methods, and running instance is described. At last, the error source of this power meter is analyzed, and the application foreground of USB technique in electric meters and meter reading system is discussed.This research provides a simple, convenient way for setting of electric meter parameters and meter reading. USB Host Technique-based three-phase electronic energy meter with unique advantages and features is being more and more recognized from the users.