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參數(shù)資料
| 型號(hào)： | ADE7758 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
| 中文描述： | 多相多功能電能計(jì)量IC每相位信息 |
| 文件頁數(shù)： | 51/68頁 |
| 文件大?。?/td> | 1584K |
| 代理商： | ADE7758 |
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ADE7758
Rev. A | Page 51 of 68
0
STEP 1
SET LCYCMODE,
LINECYC AND MASK
REGISTERS
STEP 2
SET UP SYSTEM
FOR I
, V
NOM
@ PF = 1
STEP 3
RESET STATUS
REGISTER
STEP 4
READ ALL
XWATTHR
REGISTERS AFTER
LENERGY
INTERRUPT
STEP 5
SET UP SYSTEM
FOR I
MIN
, V
NOM
@
END
FOR STEP 10
READ ALL XVARHR
AFTER LENERGY
INTERRUPT
FOR STEP 10, CALCULATE
XVAROS FOR ALL PHASES
YES
NO
TESTED @ I
MIN
STEP 7
CALCULATE
XWATTOS FOR ALL
PHASES
FOR STEP 10, WRITE TO
ALL XVAROS REGISTERS
FOR STEP 10,
PF = 0
STEP 8
WRITE TO ALL
XWATTOS
REGISTERS
STEP 9
SET UP SYSTEM
FOR I
TEST
, V
NOM
@
STEP 10
REPEAT STEP 3 TO
STEP 8 FOR
XVARHR, XVAROS
CALIBRATION
STEP 6
Figure 83. Power Offset Calibration Using Line Accumulation
Step 1: If the values were changed after gain calibration, Step 1,
Step 3, and Step 4 from the gain calibration should be repeated
to configure the LCYCMODE, LINECYC, and MASK registers.
Step 2: Set the test system for
I
TEST
,
V
NOM
, and unity power factor.
Step 3: Reset the interrupt status register by reading RSTATUS
(0x1A).
Step 4: Read all xWATHR energy registers (0x01 to 0x03) after
the LENERGY interrupt and store the values.
Step 4a: Read the FREQ (0x10) register if the frequency is
unknown.
Step 5: Set the test system for I
MIN
, V
NOM
, and unity power factor.
Step 6: Repeat Step 3 and Step 4.
Step 7: Calculate the value to be written to the xWATTOS
registers according to the following equations.
TEST
MIN
MIN
I
TEST
I
I
I
I
xWATTHR
I
xWATTHR
Offset
TEST
MIN
–
–
×
×
=
(52)
[
]
29
2
4
CLKIN
0
:
11
×
×
×
=
AccumTime
Offset
xWATTOS
(53)
where
Accumulation Time
is defined in Equation 43 and
xWATTHRI
TEST
is the value in the energy register at I
TEST
, and
xWATTHRI
MIN
is the value in the energy register at I
MIN
.
Step 8: Write to all xWATTOS registers (0x39 to 0x3B).
Step 9: Set the test system for
I
TEST
,
V
NOM
, and zero power factor
(calibrate VAR gain).
Step 10: Repeat Steps 3, 4, and 5.
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