參數(shù)資料
型號(hào)： DRM041
英文描述： Building an USB-DDC ICP Interface Board HardwareReference Design
中文描述： 構(gòu)建的USB接口板DDC的備HardwareReference設(shè)計(jì)
文件頁數(shù)： 11/80頁
文件大小： 1025K
代理商： DRM041
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Introduction
11
Designer Reference Manual — DRM040
Section 1. Introduction
The accurate measurement of the electricity supply and subsequent
billing to residential properties has traditionally been achieved through
electro-mechanical meters. Although widely used this solution has
several disadvantages including long-term accuracy, cost of calibration
and limited communications. These issues can be overcome using
digital power meters, where it is possible to achieve long term accuracy
by removing analogue components which are prone to drift over
temperature and time. Additionally, value added features for both
consumer and supplier can be incorporated. These include multiple tariff
rates that offer incentives to use electricity at off peak times and
improved communications, which make meter reading less time
consuming and more accurate.
1.1 Overview
This modular reference design is a low cost implementation of a single
phase, digital power meter that uses a 68HC908LJ12 (LJ12) MCU, with
on board 10-Bit ADC, to perform all measurements and power
calculations. This technique known as 'software metrology' keeps the
costs to a minimum, while still meeting the IEC61036, accuracy limits. A
general introduction to power meter theory and, in particular a
description of the measurement circuit and algorithm are discussed. A
system level block diagram is described giving specific details of each
hardware block. A detailed description of the software is provided to
show that all metering features can be implemented in a small 8Bit MCU.
Finally, the test results obtained are discussed to demonstrate the
accuracy limits achievable with this specific implementation.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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