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ADE7763ARS 数据表(PDF) 37 Page - Analog Devices |
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ADE7763ARS 数据表(HTML) 37 Page - Analog Devices |
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37 / 56 page  ADE7763 Rev. A | Page 37 of 56 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 LINE CYCLES FOR ACCUMULATION IN LINECYC REGISTER ADDR. 0x1C SET ITEST = Ib, VTEST = VNOM, PF = 1 CALCULATE WGAIN. SEE EQUATION 43. 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 RESET THE INTERRUPT STATUS READ REGISTER ADDR. 0x0C INTERRUPT? 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: WGAIN = INT ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 12 ) ( ) ( 2 1 nominal IB expected IB LAENERGY LAENERGY (43) 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) ) ( (44) where CFIB(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: 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 30. LAENERGYexpected is calculated to be 19186 using Equation 44. 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 |
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