参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 38/56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
CALCULATE CFDEN VALUE FOR DESIGN
LAENERGY IB ( expected ) =
Data Sheet
?
INT ?
?
?
CFNUM + 1
× WDIV
?
WRITE CFDEN VALUE TO CFDEN REGISTER
ADDR. 0x15 = CFDEN
SET I TEST = I b , V TEST = V NOM , PF = 1
?
?
?
?
?
CF IB ( expected ) × Accumulation Time (s) ?
?
?
CFDEN + 1 ?
(44)
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
SET MODE FOR LINE CYCLE
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
NO
INTERRUPT?
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
where CF IB ( expected ) (Hz) is calculated from Equation 30,
accumulation time is calculated from Equation 33, and the line
period is determined from the period register according to
Equation 34.
For this example:
Meter Constant: MeterConstant (imp/Wh) = 3.2
Test Current: I b = 10 A
Line Voltage: V nominal = 220 V
Line Frequency: f l = 50 Hz
Half Line Cycles: LINECYC IB = 2000
CF Numerator: CFNUM = 0
CF Denominator: CFDEN = 489
Energy Reading at Base Current:
LAENERGY IB ( nominal ) = 17174
Period Register Reading: PERIOD = 8959
Clock Frequency: CLKIN = 3.579545 MHz
CF expected is calculated to be 1.9556 Hz according to Equation 30.
LAENERGY expected is calculated to be 19186 using Equation 44.
INTERRUPT?
NO
CF IB ( expected ) (Hz) =
3 . 200 imp/Wh × 220 V × 10 A
3600 s/h
× cos( ? ) = 1.9556 Hz
? ? LAENERGY IB ( expected )
WGAIN = INT ? ?
? 1 ? × 2 12 ? (43)
? ? LAENERGY IB ( nominal )
? ?
?
?
?
CFNUM + 1
?
?
?
?
INT ?
1 . 9556 × 2000 / 2 × 8959 × 8 /( 3 . 579545 × 10 6 ) ?
? 1
=
489 + 1
YES
READ LINE ACCUMULATION ENERGY
ADDR. 0x04
CALCULATE WGAIN. SEE EQUATION 43.
WRITE WGAIN VALUE TO THE WGAIN
REGISTER: ADDR. 0x12
Figure 72. Calibrating Watt Gain Using an Accurate Source
Equation 43 describes the relationship between the expected
LAENERGY value and the LAENERGY measured in the test
condition:
? ?
? ?
?
LAENERGY IB ( expected ) =
INT
? ?
? CF IB ( expected ) × LINECYC IB / 2 × PERIOD × 8 / CLKIN ?
? ?
? × WDIV ?
? CFDEN + 1 ?
LAENERGY IB ( expected ) =
? ?
? 1
? ?
? ?
INT ( 19186 . 4 ) = 19186
The nominal LAENERGY reading, LAENERGY IB ( nominal ) , is the
LAENERGY reading with the test current applied. The expected
LAENERGY reading is calculated from the following equation:
WGAIN is calculated to be 480 using Equation 43.
Rev. C | Page 38 of 56
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