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ADE7753ARS 数据表(PDF) 41 Page - Analog Devices |
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ADE7753ARS 数据表(HTML) 41 Page - Analog Devices |
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41 / 60 page  ADE7753 Rev. C | Page 41 of 60 WRITE WGAIN VALUE TO THE WGAIN REGISTER: ADDR. 0x12 CALCULATE CFDEN VALUE FOR DESIGN WRITE CFDEN VALUE TO CFDEN REGISTER ADDR. 0x15 = CFDEN SET HALF LINECYCLES FOR ACCUMULATION IN LINECYC REGISTER ADDR. 0x1C SET ITEST = Ib, VTEST = VNOM, PF = 1 CALCULATE WGAIN. SEE EQUATION 47. SET MODE FOR LINE CYCLE ACCUMULATION ADDR. 0x09 = 0x0080 ENABLE LINE CYCLE ACCUMULATION INTERRUPT ADDR. 0x0A = 0x04 READ LINE ACCUMULATION ENERGY ADDR. 0x04 RESET THE INTERRUPT STATUS READ REGISTER ADDR. 0x0C INTERRUPT? NO NO YES YES 02875-A-007 RESET THE INTERRUPT STATUS READ REGISTER ADDR. 0x0C INTERRUPT? Figure 81. Calibrating Watt Gain Using an Accurate Source Equation 47 describes the relationship between the expected LAENERGY value and the LAENERGY measured in the test condition: WGAIN = INT ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 12 ) ( ) ( 2 1 nominal IB expected IB LAENERGY LAENERGY (47) The nominal LAENERGY reading, LAENERGYIB(nominal), is the LAENERGY reading with the test current applied. The expected LAENERGY reading is calculated from the following equation: LAENERGYIB(expected) = INT ⎟⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎝ ⎛ × + + × WDIV CFDEN CFNUM Time on Accumulati CF expected IB 1 1 (s) ) ( (48) where CFIB(expected)(Hz) is calculated from Equation 34, accumula- tion time is calculated from Equation 37, and the line period is determined from the PERIOD register according to Equation 38. For this example: Meter Constant: MeterConstant(imp/Wh) = 3.2 Test Current: Ib = 10 A Line Voltage: Vnominal = 220 V Line Frequency: fl = 50 Hz Half Line Cycles: LINECYCIB = 2000 CF Numerator: CFNUM = 0 CF Denominator: CFDEN = 489 Energy Reading at Base Current: LAENERGYIB (nominal) = 17174 Period Register Reading: PERIOD = 8959 Clock Frequency: CLKIN = 3.579545 MHz CFexpected is calculated to be 1.9556 Hz according to Equation 34. LAENERGYexpected is calculated to be 19186 using Equation 48. CFIB(expected)(Hz) = ) (cos( s/h 3600 A 10 V 220 imp/Wh 200 . 3 ϕ × × × = 1.9556 Hz LAENERGYIB(expected) = INT ⎟⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎝ ⎛ × + + × × × WDIV CFDEN CFNUM CLKIN PERIOD LINECYC CF IB expected IB 1 1 / 8 2 / ) ( LAENERGYIB(expected) = INT 1 1 489 1 ) 10 579545 . 3 /( 8 8959 2 / 2000 9556 . 1 6 ⎟⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎝ ⎛ + × × × × = 19186 ) 4 . 19186 ( = INT WGAIN is calculated to be 480 using Equation 47. WGAIN = INT 480 2 1 17174 19186 12 = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − Note that WGAIN is a signed twos complement register. With WDIV and CFNUM set to 0, LAENERGY can be expressed as |
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