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參數(shù)資料
| 型號： | ADE7758ARW |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | MS-013-AD, SOIC-24 |
| 文件頁數(shù)： | 32/68頁 |
| 文件大小： | 1584K |
| 代理商： | ADE7758ARW |
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ADE7758
Rev. A | Page 32 of 68
0
AWG[11:0]
WDIV[7:0]
DIGITAL
INTEGRATOR
MULTIPLIER
I
V
HPF
CURRENT SIGNAL–i(t)
0x2851EC
0x00
0xD7AE14
VOLTAGE SIGNAL–v(t)
0x2852
000x
0xD7AE
+
+
+
+
LPF2
%
SIGN
2
6
2
0
2
–1
2
–2
2
–3
2
–4
WATTOS[11:0]
WATTHR[15:0]
15
0
40
0
TOTAL ACTIVE POWER IS
ACCUMULATED (INTEGRATED) IN
THE ACTIVE ENERGY REGISTER
TIME (nT)
T
AVERAGE POWER
SIGNAL–P
0xCCCCD
0x00000
Figure 66. ADE7758 Active Energy Accumulation
The ADE7758 achieves the integration of the active power
signal by continuously accumulating the active power signal
in the internal 41-bit energy registers. The watt-hr registers
(AWATTHR, BWATTHR, and CWATTHR) represent the upper
16 bits of these internal registers. This discrete time accumulation
or summation is equivalent to integration in continuous time.
Equation 9 expresses the relationship
( )
(
)
×
=
=
∑
=
n
∫
∞
0
0
T
nT
p
Lim
dt
p
Energy
(9)
where
n
is the discrete time sample number and
T
is the sample
period.
Figure 66 shows a signal path of this energy accumulation. The
average active power signal is continuously added to the internal
active energy register. This addition is a signed operation.
Negative energy is subtracted from the active energy register.
Note the values shown in Figure 65 are the nominal full-scale
values, i.e., the voltage and current inputs at the corresponding
phase are at their full-scale input level. The average active power
is divided by the content of the watt divider register before it is
added to the corresponding watt-hr accumulation registers.
When the value in the WDIV[7:0] register is 0 or 1, active
power is accumulated without division. WDIV is an 8-bit
unsigned register that is useful to lengthen the time it takes
before the watt-hr accumulation registers overflow.
Figure 67 shows the energy accumulation for full-scale signals
(sinusoidal) on the analog inputs. The three displayed curves
show the minimum time it takes for the watt-hr accumulation
register to overflow when the watt gain register of the cor-
responding phase equals to 0x7FF, 0x000, and 0x800. The watt
gain registers are used to carry out a power calibration in the
ADE7758. As shown, the fastest integration time occurs when
the watt gain registers are set to maximum full scale, i.e., 0x7FF.
This is the time it takes before overflow can be scaled by writing
to the WDIV register and therefore can be increased by a
maximum factor of 255.
Note that the active energy register content can roll over to full-
scale negative (0x8000) and continue increasing in value when
the active power is positive (see Figure 66). Conversely, if the
active power is negative, the energy register would under flow
to full-scale positive (0x7FFF) and continue decreasing in value.
By setting the AEHF bit (Bit 0) of the interrupt mask register,
the ADE7758 can be configured to issue an interrupt (IRQ)
when Bit 14 of any one of the three watt-hr accumulation
registers has changed, indicating that the accumulation register
is half full (positive or negative).
Setting the RSTREAD bit (Bit 6) of the LCYMODE register
enables a read-with-reset for the watt-hr accumulation registers,
i.e., the registers are reset to 0 after a read operation.
0
CONTENTS OF WATTHR
ACCUMULATION REGISTER
0x7FFF
0x3FFF
0x0000
0xC000
0x8000
TIME (Sec)
0.13
0.52
0.79
1.05
1.31
1.58
WATT GAIN = 0x7FF
WATT GAIN = 0000
WATT GAIN = 0800
Figure 67. Energy Register Roll-Over Time for Full-Scale Power
(Minimum and Maximum Power Gain)
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| ADE7758ARWRL | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
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| ADE7758ARWZRL | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7758ARWRL | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7758ARWZ | 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 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:* |
| ADE7758ARWZ | 制造商:Analog Devices 功能描述:ENERGY METERING IC 制造商:Analog Devices 功能描述:IC, POLY-PHASE ENERGY METERING, SOIC-24 |
| ADE7758ARWZ | 制造商:Analog Devices 功能描述:IC ENERGY METER 3 PHASE SOIC-24 |
| ADE7758ARWZRL | 功能描述:IC ENERGY METERING 3PHASE 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 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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