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基于MCF51EM256设计的多相智能电表技术




关键词:
MCF51EM256/128系列是ColdFire DISC 32位微控制器(mcu),是基于V1 ColdFire核的系统级芯片(SoC),3.6V时的工作频率高达50.33MHz,有多达256KB的闪存,多达16KB的RAM,电池工作模式的功耗小于1.3uA,通信接口包括UART,IIC 和SPI, 目标应用为智能测试,相位测量单元,工业能量测量和1相与3相电表等.本文介绍MCF51EM256/128系列主要特性,功能方框图,以及基于MCF51EM256的多相智能电表参考设计的方框图,主要特性和指标和详细电路图.

The MCF51EM256/128 series microcontrollers are a member of the ColdFire® family of reduced instruction set computing (RISC) microprocessors.

This document provides an overview of these 32-bit microcontrollers, focusing on their highly integrated and diverse feature set.

These microcontrollers are systems-on-chips (SoCs) that are based on the V1 ColdFire core and the following features:

• Operating at processor core speeds up to 50.33 MHz (peripherals operate at half of
this speed) at 3.6 V to 2.5 V and 20 MHz at 2.5 V to 1.8 V

• Up to 256 KB of flash memory

• Up to 16 KB of RAM

• Less than 1.3 μA of typical power consumption in battery mode, with MCU supply off

• Ultra-low power independent RTC with calendar features, separate time base, power domain, and 32 bytes of RAM

• A collection of communications peripherals, including UART, IIC and SPI

• Integrated 16-bit SAR analog-to-digital converter

• Programmable delay block (PDB)

• Two analog comparators with selectable interrupt (PRACMP)

• LCD driver

• Three serial communications interface modules (SCI)

• Three serial peripheral interfaces

• Inter-integrated circuit (IIC)

• Two 8-bit and one 16-bit modulo timers (MTIM)

• Two-channel timer/PWM module (TPM)

MCF51EM256目标应用:

Smart Metering

Sensor collect

Phase Measurement Units

Industrial energy measurement

1- phase & 3- phase electricity meters


图1.MCF51EM256系列方框图

基于MCF51EM256的多相智能电表参考设计

The polyphase reference design is a cost-optimized implementation of a 1-phase or 3-phase 110V and 230V smart electricity meter. The reference design contains all of the necessary hardware and software to make the development of production smart meters quick and easy, including pre-compliance test data is to help with the certification process. It is based on the MCF51EM256 ColdFire® MCU and is designed to meet US ANSI C12, Euro/Asia IEC62053 standards up to and beyond class 0.5

多相智能电表参考设计主要特性:

Complete solution for 1-phase, 3-phase, 110V and 230V electricity meters for all global regions

Able to achieve class 0.5 or better for active energy

Enables rapid development and deployment of a production meter

Full documentation including pre-compliance test data is available, to simplify and speed certification process

Software source code is supplied as a CodeWarrior project for easy re-use:

Direct use in a metering application

Customization and extension

Use of individual modules in other projects

Full working reference design is available for loan and evaluation

Designed and tested against:

IEC 62053-22 International Energy Metering Specification, class 0.5 (or better) for active energy

IEC 62053-23 International Energy Metering Specification, class 2 for reactive energy

IEC 62056-21 International Energy Metering data exchange Specification

IEC 62053-22, IEC 62053-23, IEC 62052-11 Electro Static Discharge (ESD), tested per IEC 61000-4


图2.多相智能电表参考设计方框图

基于MCF51EM256的多相智能电表(220V)指标:

MCF51EM256-based Poly Phase Energy Meter Reference Design 220V Technical Specifications

Environmental

Compliance IEC 60529

Ingress protection IP 51 (Indoor type meter)

Operating Temperature -25℃ to +55℃

Storage Temperature -25℃ to +70℃

Humidity 95%

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