参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 30/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADE7763 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 已用 IC / 零件： | ADE7763 |
| 已供物品： | 板 |
| 相关产品： | ADE7763ARSZRLDKR-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLCT-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZ-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLTR-ND - IC ENERGY METERING 1PHASE 20SSOP |
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ADE7763
The active power signal (output of LPF2) can be rewritten as
Data Sheet
higher output frequencies. The ripple becomes larger as a
? 2 f L ? ?
?
? ?
? ?
? VI ?
p ( t ) ? VI ? ? ? ? cos( 4 ? f L t )
2
? ?
? 1 ? ? ? ?
? ? 8 . 9 ? ?
where f L is the line frequency, for example, 60 Hz.
From Equation 13,
(18)
percentage of the frequency at larger loads and higher output
frequencies. This occurs because the integration or averaging
time in the energy-to-frequency conversion process is shorter at
higher output frequencies. Consequently, some of the sinusoidal
ripple in the energy signal is observable in the frequency output.
Choosing a lower output frequency at CF for calibration can
significantly reduce the ripple. Also, averaging the output
frequency by using a longer gate time for the counter achieves
the same results.
? 2 f L ? ?
?
? ?
? ?
? VI ?
E ( t ) ? VIt ? ? ? ? sin( 4 ? f L t )
2
? 4 ? f L 1 ? ? ? ?
? ?
? ? 8 . 9 ? ?
(19)
E(t)
Vlt
Note that in Equation 19 there is a small ripple in the energy
calculation due to a sin(2ωt) component. This is shown graphi-
–
VI
4 ??? f L (1+2 ? f L /8.9Hz )
sin(4 ??? f L ? t)
cally in Figure 60. The active energy calculation is represented
by the dashed, straight line and is equal to V × I × t. The sinu-
soidal ripple in the active energy calculation is also shown.
Because the average value of a sinusoid is 0, the ripple does not
contribute to the energy calculation over time. However, the
ripple might be observed in the frequency output, especially at
WGAIN[11:0]
t
Figure 60. Output Frequency Ripple
OUTPUT
FROM
%
+
+
48
0
LPF2
APOS[15:0]
WDIV[7:0]
ACCUMULATE ACTIVE
FROM
CHANNEL 2
ADC
LPF1
ZERO CROSSING
DETECTION
CALIBRATION
CONTROL
23
LAENERGY[23:0]
0
ENERGY IN INTERNAL
REGISTER AND UPDATE
THE LAENERGY REGISTER
AT THE END OF LINECYC
LINE CYCLES
LINECYC[15:0]
Figure 61. Energy Calculation Line Cycle Energy Accumulation Mode
Rev. C | Page 30 of 56
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