參數(shù)資料
型號(hào)： EVAL-ADE7754EB
廠商： Analog Devices, Inc.
英文描述： Poly-phase Multi-Function Energy Metering IC with Serial Port
中文描述： 多相多功能電能計(jì)量IC串口
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 630K
代理商： EVAL-ADE7754EB
REV. PrG 01/03
PRELIMINARY TECHNICAL DATA
ADE7754
–
17
–
ROOT MEAN SQUARE MEASUREMENT
Root Mean Square (RMS) is a fundamental measurement of
the magnitude of an AC signal. Its definition can be both
practical and mathematical. Defined practically, the RMS
value assigned to an AC signal is the amount of DC required
to produce an equivalent amount of heat in the same load.
Mathematically: the RMS value of a continuous signal f(t) is
defined as:
F
T
f
( )
rms
T
∫
0
=
1
2
(1)
For time sampling signals, rms calculation involves squaring
the signal, taking the average and obtaining the square root:
F
N
f
i
rms
=
=
∑
1
2
1
( )
(2)
The method used to calculate the RMS value in the ADE7754
is to low-pass filter the square of the input signal (LPF3) and
take the square root of the result.
With
V t
V
t
rms
( )
sin
=
(
)
2
ω
then
V t
V t
V
V
t
rms
rms
( )
( )
cos
×
=
(
)
2
2
2
ω
The RMS calculation is simultaneously processed on the six
analog input channels. Each result is available on separate
registers.
Current RMS calculation
Figure 18 shows the detail of the signal processing chain for
the RMS calculation on one of the phases of the current
channel. The current channel RMS value is processed from
the samples used in the current channel waveform sampling
mode. It should be noticed that the APGAIN adjustment
affects the result of the RMS calculation - see Current RMS
Gain adjust. The current RMS values are stored in an
unsigned 24-bit registers (AIRMS, BIRMS and CIRMS).
One LSB of the current RMS register is equivalent to one
LSB of a current waveform sample. The update rate of the
current RMS measurement is CLKIN/12.
With the specified full scale analog input signal of 0.5V, the
ADC will produce an output code which is approximately
±2,684,354d - see
Current channel ADC
. The equivalent
RMS values of a full-scale AC signal and full scale DC signal
are respectively 1,898,124d (1CF68Ch) and 2,684,354d
(28F5C2h).
With offset calibration, the current rms measurement pro-
vided in the ADE7754 is accurate within +/-2% for signal
input between Full scale and Full scale/100.
Note:
A crosstalk between phases can appear in the ADE7754
current rms measurements. This crosstalk follows a specific
pattern: Current rms measurements of Phase A are corrupted
by the signal on the Phase C current input, Current rms
measurements of Phase B are corrupted by the signal on the
Phase A current input and Current rms measurements of
Phase C are corrupted by the signal on the Phase B current
input. This crosstalk is only present on the current rms
measurements and does not affect the regular Active power
measurements. The level of the crosstalk is dependent on the
level of the noise source and the phase angle between the noise
source and the corrupted signal. The level of the crosstalk can
be reduced by writing 0x01F7 to the address 0x3D. This 16-
bit register is reserved for factory operation and should not be
written to any other value.
When the current inputs are 120° out of phase and the register
0x3D is set to 0x01F7, the level of the current rms crosstalk
is below 2%.
24
LPF3
FS
Current Signal - i(t)
-100% to +100% FS
Irms(t)
1CF68Ch
00h
IRMS
IA
S
+
SGN21121029
222120
IRMSOS[11:0]
24
AAPGAIN
HPF
00000h
400000h
28F5C2h
C00000h
D70A3Eh
+ FS
- FS
ADC Output
word Range
0000h
EB8520h
1CF68Ch
147AE0h
+ 100% FS
+ 70.7% FS
- 100% FS
- 122.5% FS
E30974h
DC8713h
+ 122.5% FS
- 70.7% FS
2378EDh
AAPGAIN[11:0]
000h
7FFh
800h
Current Channel (RMS)
Figure 18 - Current RMS signal processing
相關(guān)PDF資料
PDF描述
EVAL-ADE7755EB Energy Metering IC with Pulse Output
EVAL-ADE7756EB Active Energy Metering IC with Serial Interface
EVAL-ADE7757EB Energy Metering IC with Integrated Oscillator
EVAL-ADE7759E Active Energy Metering IC with di/dt Sensor Interface
EVAL-ADE7763EB Single-Phase Active and Apparent Energy Metering IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-ADE7754EBZ 功能描述:BOARD EVALAUTION FOR ADE7754 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081
EVAL-ADE7755EB 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7755EBZ 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755EBZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755ZEB 功能描述:BOARD EVALUATION FOR AD7755 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*