参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 36/56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
Data Sheet
AENERGY expected = AENERGY nominal × ? ? 1 +
WGAIN ?
2 12
?
Watt Gain
The first step of calibrating the gain is to define the line voltage,
?
?
(36)
× cos( ? )
× ? ? 1 +
( CFNUM + 1 ) WGAIN ?
2 12
the base current, and the maximum current for the meter. A
meter constant, such as 3200 imp/kWh or 3.2 imp/Wh, needs to
be determined for CF. Note that the line voltage and the
maximum current scale to half of their respective analog input
ranges in this example.
The expected CF in Hz is
CF expected (Hz) =
MeterConst ant (imp/Wh ) × Load ( W )
(30)
3600 s/h
where:
? is the angle between I and V.
cos ( ? ) is the power factor.
The ratio of active energy LSBs per CF pulse is adjusted using
the CFNUM, CFDEN, and WDIV registers.
CF expected (Hz) = CF nominal × ?
( CFDEN + 1 ) ? ?
(37)
When calibrating with a reference meter, WGAIN is adjusted
until CF matches the reference meter pulse output. If an
accurate source is used to calibrate, WGAIN will be modified
until the active energy accumulation rate yields the expected CF
pulse rate.
The steps of designing and calibrating the active energy portion
of a meter with either a reference meter or an accurate source
are outlined in the following examples. The specifications for
this example are
Meter Constant: MeterConstant (imp/Wh) = 3.2
Base Current: I b = 10 A
Maximum Current: I MAX = 60 A
CF expected =
LAENERGY
Accumulati onTime (s)
× WDIV ×
( CFNUM + 1)
( CFDEN + 1 )
(31)
Line Voltage:
Line Frequency:
V nominal = 220 V
f l = 50 Hz
Load (W) × Accumulati on Time ( s )
LSB =
Wh
LAENERGY × 3600 s/h
LINECYC IB × Line Period ( s )
× cos( ? ) = 1 . 9556 Hz
Line Period (s) = PERIOD ×
(34)
The relationship between watt-hours accumulated and the
quantity read from AENERGY can be determined from the
amount of active energy accumulated over time with a
given load:
(32)
where Accumulation Time can be determined from the value in
the line period and the number of half line cycles fixed in the
LINECYC register.
Accumulation time (s) = (33)
2
The line period can be determined from the period register:
8
CLKIN
The AENERGY Wh/LSB ratio can also be expressed in terms of
the meter constant:
The first step in calibration with either a reference meter or an
accurate source is to calculate the CF denominator, CFDEN.
This is done by comparing the expected CF pulse output to the
nominal CF output with the default CFDEN = 0x3F and
CFNUM = 0x3F when the base current is applied.
The expected CF output for this meter with the base current
applied is 1.9556 Hz using Equation 30.
CF IB ( expected ) (Hz) =
3 . 200 imp/Wh × 10 A × 220 V
3600 s/h
Alternatively, CF expected can be measured from a reference meter
pulse output.
CF expected (Hz) = CF ref (38)
The maximum CF frequency measured without any frequency
division and with ac inputs at full scale is 23 kHz. For this
example, the nominal CF with the test current, I b , applied is
958 Hz. In this example the line voltage and maximum current
( CFNUM + 1 )
( CFDEN + 1 )
LSB
CF nominal (Hz) = 23 kHz × 1 2 × 1 2 ×
× WDIV
Wh = (35)
MeterConst ant (imp/Wh)
In a meter design, WDIV, CFNUM, and CFDEN should be kept
constant across all meters to ensure that the Wh/LSB constant is
maintained. Leaving WDIV at its default value of 0 ensures
scale half of their respective analog input ranges. The line
voltage and maximum current should not be fixed at the
maximum analog inputs to account for occurrences such as
spikes on the line.
I
I MAX
(39)
maximum resolution. The WDIV register is not included in the
CF signal chain, so it does not affect the frequency pulse output.
The WGAIN register is used to finely calibrate each meter. Cali-
brating the WGAIN register changes both CF and AENERGY for
a given load condition.
CF IB ( nominal ) (Hz) = 23 kHz × 1 2 × 1 2 × 10 60 = 958 Hz
The nominal CF on a sample set of meters should be measured
using the default CFDEN, CFNUM, and WDIV to ensure that
the best CFDEN is chosen for the design.
With the CFNUM register set to 0, CFDEN is calculated to be
489 for the example meter:
Rev. C | Page 36 of 56
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