參數(shù)資料
型號(hào)： ADE7759ARSRL
廠商： ANALOG DEVICES INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： Active Energy Metering IC with di/dt Sensor Interface
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO20
封裝： SSOP-20
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 530K
代理商： ADE7759ARSRL
REV. 0
ADE7759
–24–
4
l
(1 + 2
l
/8.9Hz)
VI
–
sin(4
l
t
)
E(t)
Vlt
Figure 39. Output Frequency Ripple
LINE CYCLE ENERGY ACCUMULATION MODE
In Line Cycle Energy Accumulation mode, the energy accumu-
lation of the ADE7759 can be synchronized to the Channel 2
zero crossing so that active energy can be accumulated over an
integral number of half line cycles. The advantage of summing
the active energy over an integer number of half-line cycles is that
the sinusoidal component in the active energy is reduced to zero.
This eliminates any ripple in the energy calculation. Energy is calcu-
lated more accurately and in a shorter time because integration
period can be shortened. By using the Line Cycle Energy Accu-
mulation mode, the energy calibration can be greatly simplified
and the time required to calibrate the meter can be significantly
reduced. The ADE7759 is placed in Line Cycle Energy Accu-
mulation mode by setting Bit 7 (CYCMODE) in the mode register.
In Line Cycle Energy Accumulation mode the ADE7759
accu
mulates the active power signal in the LENERGY register
(Address
14h) for an integral number of half cycles, as shown in
Figure 40. The number of half-line cycles is specified in the
LINECYC register (Address 14h). The ADE7759 can accumu-
late
active power for up to 16,383 half cycles. Because the active
power is integrated on an integral number of half-line cycles, at
the end of a line cycle energy accumulation cycle, the CYCEND
flag in the Interrupt Status register is set (Bit 2). If the CYCEND
enable bit in the Interrupt Enable register is enabled, the
IRQ
output will also go active low. Thus the
IRQ
line can also be used
to signal the completion of the line cycle energy accumulation.
Another calibration cycle will start as long as the CYCMODE
bit in the mode register is set. Note that the result of the first
calibration is invalid and should be ignored. The result of all
subsequent line cycle accumulation is correct.
From Equations 5 and 11.
where
n
is an integer and
T
is the line cycle period.
Since the sinusoidal component is integrated over an integer
number of line cycles, its value is always zero. Therefore:
E t
( )
VIdt
VI
f
f
Hz
wt dt
)
O
nT
l
l
O
nT
∫
–
/8 9
(
= ∫
(
)
4
1 2
2
π
cos
(13)
E t
Note that in this mode, the 14-bit LINECYC register can hold a
maximum value of 16,383. In other words, the Line Cycle Energy
Accumulation mode can be used to accumulate active energy for
a maximum duration over 16,383 half-line cycles. At 60Hz line
frequency, it translates to a total duration of 16,383/120Hz = 136.5
seconds. The 40-bit signed LENERGY register can overflow if large
signals are present at the inputs. The LENERGY register can
only hold up to 11.53 seconds of active energy when both its
input channels are at ac full-scale—see Integration Time Under
Steady Load section. Large LINECYC content is meant to be
used only when the input signal is low and extensive averaging is
required to reduce the noise.
E( )
= ∫
VIdt
O
nT
+
0
(14)
VInT
( )
=
(15)
CALIBRATING THE ENERGY METER
Calculating the Average Active Power
When calibrating the ADE7759, the first step is to calibrate
the frequency on CF to some required meter constant, e.g.,
3200 imp/kWh.
To determine the output frequency on CF, the average value of
the Active Power signal (output of LPF2) must first be deter-
mined. One convenient way to do this is to use the Line Cycle
Energy Accumulation mode. When the CYCMODE (Bit 7) bit in
the mode register is set to a Logic 1, energy is accumulated over an
integer number of half-line cycles as described in the last section.
Since the line frequency is fixed at, say, 60 Hz, and the number
of half cycles of integration is specified, the total integration
time is given as:
1
2
60
×
Hz
×
number of half cycles
SIGN 2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
–
1
2
–
2
2
–
3
2
–
4
2
–
5
2
–
6
2
–
7
2
–
8
15
0
APOS [15:0]
LPF2
+
+
+
+
WAVEFORM [23:0]
LENERGY [39:0]
39
0
23
0
LINECYC [13:0]
ACTIVE POWER
SIGNAL
–
P
CCCDh
00h
FROM
MULTIPLIER
LPF1
CHANNEL 2
ADC
ZERO CROSS
DETECT
CALIBRATION
CONTROL
Figure 40. Energy Calculation in Line Cycle Energy Accumulation Mode
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADE7759ARSZ 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類(lèi)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:*
ADE7759ARSZRL 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類(lèi)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:*
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ADE7760ARS 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP 制造商:Analog Devices 功能描述:ENERGY METER IC W/ ONCHIP FAULT & OSCIL. - Rail/Tube
ADE7760ARSRL 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R 制造商:Analog Devices 功能描述:ENERGY METER IC W/ONCHIP FAULT & OSCIL. - Tape and Reel
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