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参数资料
| 型号： | ADE7753ARSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/60页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 20SSOP |
| 标准包装： | 66 |
| 输入阻抗： | 390 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 3mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
| 配用： | EVAL-ADE7753ZEB-ND - BOARD EVALUATION AD7753 |
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ADE7753
AENERGY expected = AENERGY nominal × ? ? 1 +
?
Watt Gain
The first step of calibrating the gain is to define the line voltage,
?
WGAIN ?
2 12 ?
(40)
× ? 1 +
( CFNUM + 1 ) ? WGAIN ?
( CFDEN + 1 )
?
?
CF expected (Hz) = CF nominal × ? (41)
base current and the maximum current for the meter. A meter
constant needs to be determined for CF, such as 3200 imp/kWh
or 3.2 imp/Wh. 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
2 12
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 is modified until the active
energy accumulation rate yields the expected CF pulse rate.
CF expected (Hz) =
MeterConst ant (imp/Wh) × Load (W)
3600 s/h
× cos( ? )
(34)
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
where ? is the angle between I and V, and cos ( ? ) is the power
this example are
factor.
Meter Constant:
MeterConstant (imp/Wh)
LAENERGY ( CFNUM + 1 )
The ratio of active energy LSBs per CF pulse is adjusted using
the CFNUM, CFDEN, and WDIV registers.
CF expected = × WDIV ×
Accumulati onTime (s) ( CFDEN + 1 )
(35)
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:
= 3.2
Base Current: I b = 10 A
Maximum Current: I MAX = 60 A
Line Voltage: V nominal = 220 V
Line Frequency: f l = 50 Hz
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 and when the base current is applied.
Wh
LSB =
Load (W) × Accumulation Time (s)
LAENERGY × 3600 s/ h
(36)
The expected CF output for this meter with the base current
applied is 1.9556 Hz using Equation 34.
where Accumulation Time can be determined from the value in
CF IB ( expected ) (Hz) =
the line period and the number of half line cycles fixed in the
LINECYC register.
3. 200 imp/Wh × 10 A × 220 V
3600 s/h
× cos( ? ) = 1 . 9556 Hz
Accumulation time (s) =
LINECYC IB × Line Period (s)
2
(37)
Alternatively, CF expected can be measured from a reference meter
pulse output if available.
The line period can be determined from the PERIOD register:
CF expected (Hz) = CF ref
(42)
Line Period (s) = PERIOD ×
8
CLKIN
(38)
The maximum CF frequency measured without any frequency
division and with ac inputs at full scale is 23 kHz. For this
( CFNUM + 1 )
LSB = MeterConst ant (imp/Wh)
( CFDEN + 1 )
(39)
The AENERGY Wh/LSB ratio can also be expressed in terms of
the meter constant:
× WDIV
Wh
example, the nominal CF with the test current, I b , applied is
958 Hz. In this example the line voltage and maximum current
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.
CF nominal (Hz) = 23 kHz × 2 × 2 ×
1
1
CF IB ( nominal ) (Hz) = 23 kHz × 2 × 2 × = 958 Hz
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
maximum resolution. The WDIV register is not included in the
I
I MAX
1 1 10
60
(43)
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.
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 39 of 60
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7753ARSZ | 制造商:Analog Devices 功能描述:ENERGY METERING IC |
| ADE7753ARSZ | 制造商:Analog Devices 功能描述:IC MULTIFUNCTION METER |
| ADE7753ARSZRL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| ADE7753-ARSZRL | 制造商:Analog Devices 功能描述: |
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