參數(shù)資料
型號： ADE7753
廠商： Analog Devices, Inc.
英文描述： Active and Apparent Energy Metering IC with di/dt sensor interface
中文描述： 主動與迪視電能計量IC / dt的傳感器接口
文件頁數(shù)： 23/38頁
文件大?。?/td> 449K
代理商： ADE7753
ADE7753
–23–
REV. PrF 10/02
PRELIMINARY TECHNICAL DATA
accumulation mode by setting the MSB of the MOD E
register (MODE[15]). T he default setting for this mode is
off. T ransitions in the direction of power flow, going from
negative to positive or positive to negative, set the IRQ pin
to active low if the Interrupt Enable register is enabled. T he
Interrupt Status Registers, PPOS and PNEG, show which
transition has occurred.
See ADE7753 Register Descriptions.
NO LOAD T HRE SHOLD
T he ADE7753 includes a "no load threshold" feature that will
eliminate any creep effects in the meter. T he ADE7753
accomplishes this by not accumulating energy if the multi-
plier output is below the "no load threshold". T his threshold
is 0.001% of the full-scale output frequency of the multiplier.
Compare this value to the IEC1036 specification which states
that the meter must start up with a load equal to or less than
0.4% Ib. T his standard translates to .0167% of the full-scale
output frequency of the multiplier.
R E A C T IV E P OW E R C A L C UL A T ION
Reactive power is defined as the product of the voltage and
current waveforms when one of this signal is phase shifted by
90o. T he resulting waveform is called the instantaneous
reactive power signal. Equation 17 gives an expression for the
instantaneous reactive power signal in an ac system when the
phase of the current channel is shifted by +90o.
)
sin(
2
)
(
θ
ω +
=
t
V
t
v
(15)
)
t
sin(
I
)
)
ω
sin(
I
)
2
2
2
π
+
ω
=
=
(16)
Where
θ
is the phase difference between the voltage and
current channel, V = rms voltage and I = rms current.
)
(
i
θ
)
(
)
(
t
t
v
t
Rp
×
=
=
)
2
sin(
)
sin(
)
(
θ
ω
+
+
t
VI
VI
t
Rp
(17)
T he average power over an integral number of line cycles (n)
is given by the expression in Equation 18.
∫
nT
0
where T is the line cycle period.
RP is referred to as the Reactive Power. Note that the reactive
power is equal to the DC component of the instantaneous
reactive power signal
Rp(t)
in Equation 17. T his is the
relationship used to calculate reactive power in the ADE7753.
T he instantaneous reactive power signal
Rp(t)
is generated by
multiplying the channel 1 and channel 2. In this case, the
phase of the channel 1 is shifted by +90o. T he DC component
of the instantaneous reactive power signal is then extracted by
a low pass filter to obtain the reactive power information.
Figure 41 shows the signal processing in the Reactive Power
calculation in the ADE7753.
=
=
nT
VI
dt
)
t
Rp
RP
)
sin(
(
1
θ
(18)
+
+
Σ
CALIBRATION
CONTROL
LINECYC[14:0]
LPF1
FROM
CHANNEL 2
ADC
ZERO CROSS
DETECTION
ACCUMULATE ACTIVE
ENERGY IN INTERNAL
REGISTER AND UPDATE
THE LVARENERGY
REGISTER AT THE END OF
LINECYC LINE CYCLES
47
0
LVARENERGY[23:0]
23
0
Instantaneous Reactive
Power Signal - Rp(t)
MULTIPLIER
90 DEGREE
PHASE SHIFT
I
Π
2
V
Figure 41 - Reactive Power Signal Processing
T he features of the Reactive Energy accumulation are the
same as the Line Active Energy accumulation. T he number
of half line cycles is specified in the L INEC Y C register.
LINECYC is an unsigned 16-bit register. T he ADE7754 can
accumulate Reactive Power for up to 65535 combined half
cycles. At the end of an energy calibration cycle the CYCEND
flag in the Interrupt Status register is set. If the CYCEND
mask bit in the Interrupt Mask register is enabled, the
IRQ
output will also go active low. T hus the
IRQ
line can also be
used to signal the end of a calibration. T he AD E7753
accumulates the Reactive Power signal in the LVARENERGY
register for an integer number of half cycles, as shown in
Figure 41.
T he Reactive Energy accumulation in the ADE7753 not only
provides the reactive energy calculated using the phase shift
method, it is also useful to provide the sign of the reactive
power if it is desirable to use triangular method to calculate
reactive power. T he ADE7753 also provides an accurate
measurement of the apparent power. T he user can choose to
determine reactive energy through the mathematical rela-
tionship between apparent, active and reactive power. T he
sign of the reactive energy can be found by reading the result
from the LVARENERGY register at the end of a reactive
energy accumulation cycle.
2
2
)
(Re
Re
Energy
Active
Energy
Apparent
Energy
active
sign
Energy
active
×
=
APPARE NT POWE R CALCULAT ION
Apparent power is defined as the amplitude of the vector sum
of the Active and Reactive powers -see Figure 42. T he angle
θ
between the Active Power and the Apparent Power generally
represents the phase shift due to non-resistive loads. For
single phase applications,
θ
represents the angle between the
voltage and the current signals. Equation 20 gives an expres-
sion of the instantaneous power signal in an ac system with a
phase shift.
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