參數(shù)資料
型號(hào)： ADE7754ARRL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： ADE7754
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： MS-013AD, SOIC-24
文件頁數(shù)： 24/44頁
文件大?。?/td> 630K
代理商： ADE7754ARRL
REV. PrG 01/03
PRELIMINARY TECHNICAL DATA
ADE7754
–
24
–
No Load Threshold
The ADE7754 includes a selectable
“
no load threshold
”
or
“
start up current
”
feature that will eliminate any creep effects
in the active energy measurement of the meter. When
enabled, this function is independently applied on each
phase
’
s active power calculation. This mode is selected by
default and can be disabled by setting to logic one bit3 of the
GAIN register (Address 18h) - see Table X. Any load
generating an active power amplitude lower than the mini-
mum amplitude specified, will not be taken into account
when accumulating the active power from this phase.
The minimum instantaneous active power allowed in this
mode is 0.005% of the full scale amplitude. As the maximum
active power value is 13,743,895d with full scale analog
input, the no-load threshold is 687d. For example, an energy
meter with maximum inputs of 220V and 40A and Ib=10A,
the maximum instantaneous active power is 3,435,974d
assuming that both inputs represent half of the analog input
full scale . As the no-load threshold represents 687d, the start
up current represents 8mA or 0.08% of Ib.
Mode selection of the sum of the three active energies
The ADE7754 can be configured to execute the arithmetic
sum of the three active energies, Wh = Wh
φ
A
+
Wh
φΒ
+
Wh
φ
C
,
or the sum of the absolute value of these energies, Wh =
|Wh
φ
A
|
+ |
Wh
φΒ
|
+
|Wh
φ
C
|
. The selection between the two
modes can be made by setting bit2 of the GAIN register
(Address 18h) - see Table X. Logic high and logic low of this
bit correspond respectively to the sum of absolute values and
the arithmetic sum. This selection affects the active energy
accumulation in the AENERGY, RAENERGY, LAENERGY
registers as well as for the CF frequency output.
When the sum of the absolute values is selected, the active
energy from each phase is always counted positive in the total
active energy. It is particularly useful in 3-phase 4-wire
installation where the sign of the active power should always
be the same. If the meter is misconnected to the power lines
i.e. CT connected in the wrong direction, the total active
energy recorded without this solution can be reduced by two
third. The sum of the absolute values assures that the active
energy recorded represents the actual active energy delivered.
In this mode, the Reverse Power information available in the
CFNUM register is still detecting when negative active
power is present on any of the three phase inputs.
LINE ENERGY ACCUMULATION
The ADE7754 is designed with a special energy accumula-
tion mode which simplifies the calibration process. By using
the on-chip zero-crossing detection, the ADE7754 accumu-
lates the Active Power signal in the LAENERGY register for
an integer number of half cycles, as shown in Figure 29. The
line active energy accumulation mode is always active.
Important:
It is recommended to use this mode with only
one phase selected. If several phases are selected, the amount
accumulated can be smaller than it is supposed to be.
Each one of three phases zero-crossing detection can contrib-
ute to the accumulation of the half line cycles. Phase A, B and
C zero crossings are respectively taken into account when
counting the number of half line cycles by setting to logic one
bits 4-6 of the MMODE register. Selecting phases for the
Zero crossing counting has also the effect of enabling the
Zero-crossing detection, Zero-crossing Time-Out and Pe-
riod Measurement for the corresponding phase as described
in the Zero-crossing Detection paragraph.
The number of half line cycles is specified in the LINCYC
register. LINCYC is an unsigned 16-bit register. The
ADE7754 can accumulate Active Power for up to 65535
combined half cycles. Because the Active Power is integrated
on an integer number of line cycles, the sinusoidal compo-
nent is reduced to zero. This eliminates any ripple in the
energy calculation. Energy is calculated more accurately
because of this precise timing control. At the end of an energy
calibration cycle the LINCYC flag in the Interrupt Status
register is set. If the LINCYC mask bit in the Interrupt Mask
register is enabled, the
IRQ
output will also go active low.
+
+
Σ
LPF1
FROM VA
ADC
ZEROCROSS
DETECT
CALIBRATION
CONTROL
LINCYC[15:0]
Σ
+
+
Power Phase A
Power Phase B
Power Phase C
LPF1
FROM VB
ADC
ZEROCROSS
DETECT
LPF1
FROM VC
ADC
ZEROCROSS
DETECT
ACCUMULATE ACTIVE POWER DURING
LINCYC ZERO-CROSSINGS
51
0
51
0
LAENERGY[23:0]
WDIV
23
0
MMODE register
bit 6
MMODE register
bit 4
MMODE register
bit 5
Figure 29 - ADE7754 Active Energy Calibration
相關(guān)PDF資料
PDF描述
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ADE7755ARS Energy Metering IC with Pulse Output
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADE7754ARZ 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:*
ADE7754ARZRL 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:*
ADE7755 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output
ADE7755AARSRL 制造商:Analog Devices 功能描述:ENERGY METERING IC WITH P - Tape and Reel
ADE7755AN 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
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