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参数资料
| 型号： | ADE7758ARWZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 51/72页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 3PHASE 24SOIC |
| 标准包装： | 1,000 |
| 输入阻抗： | 380 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 8mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 3 相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
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APCF NOMINAL = 16 kH z ×
× = 0 . 5415 kHz
× cos ( θ = 1.956 Hz
)
APCF EXPECTED =
APCFDEN = INT ?
? = 277
? 1 . 956 Hz ?
LINECYC [ 15 : 0 ]
AccumTime =
2 ×
× No. of Phases Selected
Data Sheet
To set APCFNUM (0x45) and APCFDEN (0x46) to the
calculated value to perform a coarse adjustment on the
imp/kW-hr ratio, use Equation 45 to Equation 47.
220 10
500 130
3200 × 10 × 220
1000 × 3600
? 541. 5 Hz ?
? ?
Under the test conditions above, the AWATTHR register value
is 15559d after the LENERGY interrupt. Using Equation 60 and
Equation 61, the value to be written to AWG is ?199d, 0xF39.
1
FREQ [ 11 : 0 ] × 9 . 6 × 10 ? 6
STEP 1
SET LCYCMODE,
LINECYC AND MASK
REGISTERS
STEP 2
SET UP SYSTEM FOR
I TEST , V NOM , PF = 0.5,
INDUCTIVE
STEP 3
RESET STATUS
REGISTER
STEP 4
READ ALL xWATTHR
REGISTERS AFTER
LENERGY
INTERRUPT
STEP 5
CALCULATE PHASE
ERROR IN DEGREES
FOR ALL PHASES
STEP 6
CALCULATE AND
WRITE TO ALL
xPHCAL REGISTERS
ADE7758
AccumTime =
2 ×
0 x 800
1
2085 × 9 . 6 × 10
? 6
× 3
= 6.832128s
Figure 83. Phase Calibration Using Line Accumulation
Step 1: If the values were changed after gain calibration, Step 1,
WATTHR EXPECTED =
4 × 3200 × 10 × 220 × 1 × 6. 832
1000 × 3600
×
277
1
× 1 = 14804
Step 3, and Step 4 from the gain calibration should be repeated
to configure the LCYCMODE and LINECYC registers.
Step 2: Set the test system for I TEST , V NOM , and 0.5 power factor
inductive.
xWG = ? ?
? 1 ? ? × 2 12 = –198.87640 = –199 = 0xF39
14804
? 15559
?
Step 3: Reset the interrupt status register by reading RSTATUS
(0x1A).
Using Equation 66, the Wh/LSB constant is
Step 4: The xWATTHR registers should be read after the
Wh
LSB
=
10 × 220 × 6. 832
3600 × 14804
= 0.000282 0
LENERGY interrupt. Measure the percent error in the energy
register readings (AWATTHR, BWATTHR, and CWATTHR)
compared to the energy register readings at unity power factor
Error =
2
xWATTHR PF = 1
Phase Calibration Using Line Accumulation
The ADE7758 includes a phase calibration register on each
phase to compensate for small phase errors. Large phase errors
should be compensated by adjusting the antialiasing filters. The
ADE7758 phase calibration is a time delay with different weights
in the positive and negative direction (see the Phase
Compensation section). Because a current transformer is a
source of phase error, a fixed nominal value can be decided on to
load into the xPHCAL (0x3F to 0x41) registers at power-up.
(after gain calibration) using Equation 69. The readings at unity
power factor should have been repeated after the gain calibration
and stored for use in the phase calibration routine.
xWATTHR PF = 1
xWATTHR PF = 5 –
(69)
2
Step 5: Calculate the Phase Error in degrees using the equation
Phase Error ( ° ) = – Arcsin ?
?
During calibration, this value can be adjusted for CT-to-CT
error. Figure 83 shows the steps involved in calibrating the
phase using the line accumulation mode.
? Error ?
? 3 ?
(70)
Step 6: Calculate xPHCAL and write to the xPHCAL registers
(0x3F to 0x41).
xPHCAL =
×
Phase Error ×
1
PHCAL _ LSB _ Weight
×
1 1 (71)
Line Period ( s ) 360 °
where PHCAL_LSB_Weight is 1.2 μs if the %Error is negative
or 2.4 μs if the %Error is positive (see the Phase Compensation
section).
Rev. E | Page 51 of 72
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