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参数资料
| 型号： | ADE7758ARWZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 50/72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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ADE7758
Step 5: Set the LENERGY bit, MASK[12] (0x18), to Logic 1
to enable the interrupt signaling the end of the line cycle
accumulation.
Data Sheet
Step 9b: Calculate the values to be written to the xVAG registers
according to the following equation:
VAHR EXPECTED =
Step 6: Set the test system for I TEST , V NOM , and unity power factor
(calibrate watt and VA simultaneously and first).
4 × MC × I TEST × V NOM × AccumTime
1000 × 3600
×
VARCFDEN
VARCFNUM
×
1
VADIV
xVAG = ? ?
? 1 ? ? × 2 12
Step 7: Read the FREQ (0x10) register if the line frequency is
unknown.
Step 8: Reset the interrupt status register by reading
RSTATUS (0x1A).
? VAHR EXPECTED
? VAHR MEASURED
?
?
(64)
Step 9: Read all six xWATTHR (0x01 to 0x03) and xVAHR
(0x07 to 0x09) energy registers after the LENERGY interrupt
and store the values.
Step 9a: Calculate the values to be written to xWG registers
Step 10: Write to xWG and xVAG.
Step 11: Set the test system for I TEST , V NOM , and zero power
factor inductive to calibrate VAR gain.
Step 12: Repeat Step 7.
according to the following equations:
WATTHR EXPECTED =
4 × MC × I TEST × V NOM × cos ( θ ) × AccumTime
1000 × 3600
×
(60)
Step 13: Read the xVARHR (0x04 to 0x06) after the LENERGY
interrupt and store the values.
Step 14: Calculate the values to be written to the xVARG
registers (to adjust VARCF to the expected value).
×
APCFDEN 1
APCFNUM WDIV
where AccumTime is
VARHR EXPECTED =
4 × MC × I TEST × V NOM × sin ( θ ) × AccumTime
1000 × 3600
×
(65)
LINECYC [ 15 : 0 ]
2 × Line Frequency × No. of Phases Selected
(61)
VARCFDEN
VARCFNUM
×
1
VARDIV
xVARG = ? ?
? 1 ? ? × 2 12
where:
MC is the meter constant.
? VARHR EXPECTED
? VARHR MEASURED
?
?
Line Frequency =
FREQ [11 : 0] × 9.6 × 10 - 6
? WATTHR EXPECTED
xWG = ? ?
? 1 ? ? × 2 12
Wh I × V NOM × cos ( θ ) × AccumTime
VAh I × V NOM × AccumTime
VARh I × V NOM × sin ( θ ) × AccumTime
θ is the angle between the current and voltage.
Line Frequency is known or calculated from the FREQ[11:0]
register. With the FREQ[11:0] register configured for line period
measurements, the line frequency is calculated with Equation 62.
1
(62)
No. of Phases Selected is the number of ZXSEL bits set to Logic 1
in LCYCMODE (0x17).
Then, xWG is calculated as
?
(63)
? WATTHR MEASURED ?
Step 15: Write to xVARG.
Step 16: Calculate the Wh/LSB, VARh/LSB, and VAh/LSB
constants.
= TEST (66)
LSB 3600 × xWATTHR
= TEST (67)
LSB 3600 × xVAHR
= TEST (68)
LSB 3600 × xVARHR
Example: Watt Gain Calibration Using Line Accumulation
This example shows only Phase A watt calibration. The steps
outlined in the Gain Calibration Using Line Accumulation
section show how to calibrate watt, VA, and VAR. All three
phases can be calibrated simultaneously because there are nine
energy registers.
For this example, I TEST = 10 A, V NOM = 220 V, Power Factor = 1,
Frequency = 50 Hz, LINECYC (0x1C) is set to 0x800, and MC =
3200 imp/kWhr.
Rev. E | Page 50 of 72
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