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)： 53/68頁
文件大小： 1584K
代理商： ADE7758
ADE7758
Rev. A | Page 53 of 68
0
STEP 1
SET
CONFIGURATION
REGISTERS FOR
ZERO CROSSING
ON ALL PHASES
STEP 2
SET INTERRUPT
MASK FOR
ZERO CROSSING
ON ALL PHASES
STEP 3
STEP 4
READ RMS
REGISTERS
STEP 5
WRITE TO
XVRMSOS
XIRMSOS
SET UP
SYSTEM FOR
I
TEST
, V
NOM
SET UP
SYSTEM FOR
I
MAX
/500, V
NOM
SET UP SYSTEM
FOR I
TEST
,
V
NOM
START
TESTED
ALL
PHASES
YES
NO
TESTED
ALL
CONDITIONS
2
3
1
STEP 4A
CHOOSE N
n = 0
STEP 4D
READ
XIRMS
XVRMS
STEP 4E
CALCULATE THE
AVERAGE OF N
SAMPLES
STEP 4B
RESET INTERRUPT
STATUS REGISTER
END
n = n + 1
n = N
NO
YES
YES
NO
STEP 4C
INTERRUPT
Figure 84. RMS Calibration Routine
Step 1: Set configuration registers for zero crossings on all
phases by writing the value 0x38 to the LCYCMODE register
(0x17). This sets all of the ZXSEL bits to Logic 1.
Step 2: Set the interrupt mask register for zero-crossing
detection on all phases by writing 0xE00 to the MASK[0:24]
register (0x18). This sets all of the ZX bits to Logic 1.
Step 3: Set up the calibration system for one of the three test
conditions: I
TEST
and V
NOM
, I
MAX
/500 and V
NOM
, I
TEST
and V
NOM
/20.
Step 4: Read the rms registers after the zero-crossing interrupt
and take an average of N samples. This is recommended to get
the most stable rms readings. This procedure is detailed in
Figure 84—Steps 4a through 4e.
Step 4a. Choose the number of samples, N, to be averaged.
Step 4b. Reset the interrupt status register by reading RSTATUS
(0x1A).
Step 4c. Wait for the zero-crossing interrupt. When the zero-
crossing interrupt occurs, move to Step 4d.
Step 4d. Read the xIRMS (0x0A) and xVRMS (0x0C) registers.
These values will be averaged in Step 4e.
Step 4e: Average the N samples of xIRMS and xVRMS. The
averaged values will be used in Step 5.
Step 5: Write to the xVRMSOS (0x36 to 0x38) and xIRMSOS
(0x33 to 0x35) registers according to the following equations.
=
IRMSOS
(
) (
2
)
2
2
2
2
2
–
–
384
,
16
1
TEST
MAX/X
RMS
TEST
MAX/X
I
RMS
MAX/X
TEST
I
I
I
I
I
×
×
×
(56)
where I
TEST-RMS
and I
MAX/X-RMS
are the rms register values without
the offset correction for the input I
TEST
and I
MAX/X
, respectively.
NOM
NOM/20
RMS
NOM
NOM/20
V
RMS
NOM/20
NOM
V
V
V
–
V
V
VRMSOS
–
64
1
×
×
×
=
(57)
where V
NOM-RMS
and V
NOM/20-RMS
are the rms register values
without the offset correction for the input V
NOM
and V
NOM/20-RMS
,
respectively.
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