參數(shù)資料
型號(hào)： DRM040
英文描述： Single Phase Digital Power Meter Reference Design
中文描述： 單相電能表的數(shù)字參考設(shè)計(jì)
文件頁數(shù)： 17/80頁
文件大?。?/td> 1025K
代理商： DRM040
Introduction
Theory of Operation
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Introduction
17
Figure 1-4. Current measuring circuit and attenuator
The Timer2 interrupt service routine runs A/D conversions every 625
microseconds. Current samples are taken from either the
non-attenuated or attenuated A/D conversion according to a range
selection byte called “attenflag”. These samples are also used to
calculate the mean square current to determine whether the
unattenuated or attenuated current should be used in the power
calculation. The mean square current value obtained from 256 samples
is compared against two limit values “hilimit” and “l(fā)olimit” to determine
the operating range. The two values create hysteresis in the system that
avoid range switching oscillations. A time delay between voltage and
current samples adjustable by a value in memory “measdelay” is used to
equalize the phase shift between voltage and current transformers.
Phase out to load
Phase in
S
Current Transformer
3000R%1
1000R%1
10R
R
C
C
R
unattenuated current
current attenuated by 4
Vrefh/2 or baseline
LPF
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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DRM10C04 功能描述:編碼式波段開關(guān) SW DIP MINI SHAFT 10POS T/H RoHS:否 制造商:C&K Components 位置數(shù)量:10 輸出代碼:Binary Coded Decimal 執(zhí)行器:Screwdriver 觸點(diǎn)額定值: 端接類型:Solder Pin 封裝:Tube
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