參數(shù)資料
型號: ADE7763ARSRL
廠商: ANALOG DEVICES INC
元件分類: 電源管理
英文描述: Single-Phase Active and Apparent Energy Metering IC
中文描述: 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝: MO-150AE, SSOP-20
文件頁數(shù): 26/56頁
文件大?。?/td> 1328K
代理商: ADE7763ARSRL
ADE7763
Rev. A | Page 26 of 56
APOS[15:0]
WGAIN[11:0]
WDIV[7:0]
LPF2
CURRENT
CHANNEL
VOLTAGE
CHANNEL
O
TIME (nT)
4
CLKIN
T
ACTIVEPOWER
SIGNAL
+
+
AENERGY[23:0]
OUTPUTSFROMTHELPF2ARE
ACCUMULATED(INTEGRATED)IN
THEINTERNALACTIVEENERGYREGISTER
UPPER24BITSARE
ACCESSIBLETHROUGH
AENERGY[23:0]REGISTER
23
0
48
0
WAVEFORM
REGISTER
VALUES
0
%
Figure 55. Active Energy Calculation
Figure 55 shows the signal processing chain for the active power
calculation. The active power is calculated by low-pass filtering
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
contents of the watt gain register:
+
×
=
12
2
1
WGAIN
Power
Active
WGAIN
Output
(11)
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
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
when the watt gain register contents are equal to 0x800, and the
maximum range is given by writing 0x7FF to the watt gain
register. This can be used to calibrate the active power (or
energy) calculation.
0x1 3333
0xCCCD
0x6666
0xF 999A
0xF 3333
0xE CCCD
0x0 0000
A
POSITIVE
POWER
NEGATIVE
POWER
0x000
0x7FF
0x800
{WGAIN[11:0]}
ACTIVE POWER
CALIBRATION RANGE
0
Figure 56. Active Power Calculation Output Range
ENERGY CALCULATION
As stated earlier, power is defined as the rate of energy flow.
This relationship is expressed mathematically in Equation 12.
dt
dE
P
=
(12)
where:
P
is power.
E
is energy.
Conversely, energy is given as the integral of power.
=
Pdt
E
(13)
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