參數(shù)資料
型號(hào)： ADE7763ARS
廠商： ANALOG DEVICES INC
元件分類： 電源管理
英文描述： Single-Phase Active and Apparent Energy Metering IC
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝： MO-150AE, SSOP-20
文件頁(yè)數(shù)： 35/56頁(yè)
文件大?。?/td> 1328K
代理商： ADE7763ARS
ADE7763
Watt Gain
The first step of calibrating the gain is to define the line voltage,
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.
Rev. A | Page 35 of 56
The expected CF in Hz is
CF
expected
(Hz) =
MeterConst
)
cos(
s/h
3600
)
W
(
)
imp/Wh
(
×
×
Load
ant
(30)
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
=
)
+
(
)
+
(
(s)
×
×
CFDEN
CFNUM
WDIV
onTime
Accumulati
LAENERGY
(31)
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:
s/h
3600
)
(
(W)
LAENERGY
LSB
Wh
×
×
=
s
Time
on
Accumulati
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) =
2
)
(
s
Period
Line
LINECYC
IB
×
(33)
The line period can be determined from the period register:
Line Period
(s) =
PERIOD
×
CLKIN
8
(34)
The AENERGY Wh/LSB ratio can also be expressed in terms of
the meter constant:
(imp/Wh)
)
ant
(
)
+
(
LSB
Wh
MeterConst
WDIV
CFDEN
CFNUM
×
+
=
(35)
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
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.
AENERGY
expected
=
AENERGY
nominal
×
1
12
2
WGAIN
(36)
CF
expected
(Hz) =
CF
nominal
×
1
×
+
+
12
2
)
(
)
(
WGAIN
CFDEN
CFNUM
(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:
Base Current:
Maximum Current:
Line Voltage:
Line Frequency:
MeterConstant
(imp/Wh) = 3.2
I
b
= 10 A
I
MAX
= 60 A
V
nominal
= 220 V
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 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) =
imp/Wh
200
.
Hz
9556
.
)
cos(
s/h
3600
V
220
A
10
=
×
×
×
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
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADE7763ARSRL 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R
ADE7763ARSZ 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:*
ADE7763ARSZ 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20
ADE7763ARSZRL 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:*
ADE7763ARSZRL 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20
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