参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/56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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Data Sheet
ADE7763
+
CURRENT
CHANNEL
LPF2
APOS[15:0]
+
WDIV[7:0]
%
23
AENERGY[23:0]
0
UPPER 24 BITS ARE
ACCESSIBLE THROUGH
AENERGY[23:0] REGISTER
VOLTAGE
CHANNEL
WGAIN[11:0]
48
0
ACTIVE POWER
SIGNAL
T
4
CLKIN
WAVEFORM
REGISTER
VALUES
OUTPUTS FROM THE LPF2 ARE
ACCUMULATED (INTEGRATED) IN
THE INTERNAL ACTIVE ENERGY REGISTER
TIME (nT)
Figure 55. Active Energy Calculation
calculation. The active power is calculated by low-pass filtering
0x1 3333
the instantaneous power signal. Note that when reading the
waveform samples from the output of LPF2, the gain of the
active energy can be adjusted by using the multiplier and watt
gain register (WGAIN[11:0]). The gain is adjusted by writing a
twos complement 12-bit word to the watt gain register.
Equation 11 shows how the gain adjustment is related to the
0xCCCD
0x6666
0x0 0000
0xF 999A
0xF 3333
0xE CCCD
POSITIVE
POWER
NEGATIVE
POWER
contents of the watt gain register:
0x000
0x7FF
0x800
Output WGAIN ? ? ? Active Power ? ? 1 ?
? ? ?
? ?
? ?
WGAIN ? ?
2 12 ? ?
(11)
{WGAIN[11:0]}
ACTIVE POWER
CALIBRATION RANGE
Figure 56. Active Power Calculation Output Range
For example, when 0x7FF is written to the watt gain register, the
power output is scaled up by 50%. 0x7FF = 2047d, 2047/2 12 = 0.5.
Similarly, 0x800 = –2048d (signed twos complement) and
power output is scaled by –50%. Each LSB scales the power
ENERGY CALCULATION
As stated earlier, power is defined as the rate of energy flow.
This relationship is expressed mathematically in Equation 12.
output by 0.0244%. Figure 56 shows the maximum code
(hexadecimal) output range for the active power signal (LPF2).
Note that the output range changes depending on the contents
of the watt gain register. The minimum output range is given
P ?
where:
dE
dt
(12)
when the watt gain register contents are equal to 0x800, and the
maximum range is given by writing 0x7FF to the watt gain
P is power.
E is energy.
?
register. This can be used to calibrate the active power (or
energy) calculation.
Conversely, energy is given as the integral of power.
E ? Pdt
Rev. C | Page 27 of 56
(13)
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