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參數(shù)資料
| 型號： | ADE7753ARSZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 29/60頁 |
| 文件大?。?/td> | 938K |
| 代理商： | ADE7753ARSZRL |
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ADE7753
Rev. C | Page 35 of 60
The features of the line reactive energy accumulation are the
same as the line active energy accumulation. The number of
half line cycles is specified in the LINECYC register. LINECYC
is an unsigned 16-bit register. The ADE7753 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 also goes active low.
Thus the IRQ line can also be used to signal the end of a cali-
bration. The ADE7753 accumulates the reactive power signal in
the LVARENERGY register for an integer number of half cycles,
as shown in
.
SIGN OF REACTIVE POWER CALCULATION
Note that the average reactive power is a signed calculation. The
phase shift filter has –90° phase shift when the integrator is
enabled, and +90° phase shift when the integrator is disabled.
Table 9 summarizes the relationship between the phase differ-
ence between the voltage and the current and the sign of the
resulting VAR calculation.
Table 9. Sign of Reactive Power Calculation
Angle
Integrator
Sign
Between 0° to 90°
Off
Positive
Between –90° to 0°
Off
Negative
Between 0° to 90°
On
Positive
Between –90° to 0°
On
Negative
APPARENT POWER CALCULATION
The apparent power is defined as the maximum power that can
be delivered to a load. Vrms and Irms are the effective voltage and
current delivered to the load; the apparent power (AP) is defined
as Vrms × Irms. The 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—see Figure 72.
REACTIVE
POWER
APPARENT
POWER
ACTIVE
POWER
02875-0-071
θ
Figure 72. Power Triangle
The apparent power is defined as Vrms × Irms. This expression is
independent from the phase angle between the current and the
voltage.
Figure 73 illustrates the signal processing in each phase for the
calculation of the apparent power in the ADE7753.
Vrms
Irms
0xAD055
APPARENT POWER
SIGNAL (P)
CURRENT RMS SIGNAL – i(t)
VOLTAGE RMS SIGNAL– v(t)
MULTIPLIER
02875-0-072
0x00
0x1C82B3
0x00
0x17D338
VAGAIN
Figure 73. Apparent Power Signal Processing
The gain of the apparent energy can be adjusted by using the
multiplier and VAGAIN register (VAGAIN[11:0]). The gain is
adjusted by writing a twos complement, 12-bit word to the
VAGAIN register. Equation 29 shows how the gain adjustment
is related to the contents of the VAGAIN register.
+
×
=
12
2
1
VAGAIN
Power
Apparent
IN
OutputVAGA
(29)
For example, when 0x7FF is written to the VAGAIN register,
the power output is scaled up by 50%. 0x7FF = 2047d, 2047/212
= 0.5. Similarly, 0x800 = –2047d (signed twos complement) and
power output is scaled by –50%. Each LSB represents 0.0244%
of the power output. The apparent power is calculated with the
current and voltage rms values obtained in the rms blocks of the
ADE7753. Figure 74 shows the maximum code (hexadecimal)
output range of the apparent power signal. Note that the output
range changes depending on the contents of the apparent power
gain registers. The minimum output range is given when the
apparent power gain register content is equal to 0x800 and the
maximum range is given by writing 0x7FF to the apparent
power gain register. This can be used to calibrate the apparent
power (or energy) calculation in the ADE7753.
0x103880
0xAD055
0x5682B
0x00000
0x000
0x7FF
0x800
{VAGAIN[11:0]}
APPARENT POWER 100% FS
APPARENT POWER 150% FS
APPARENT POWER 50% FS
APPARENT POWER
CALIBRATION RANGE
VOLTAGE AND CURRENT
CHANNEL INPUTS: 0.5V/GAIN
02875-0-073
Figure 74. Apparent Power Calculation Output Range
Apparent Power Offset Calibration
Each rms measurement includes an offset compensation
register to calibrate and eliminate the dc component in the rms
value—see Channel 1 RMS Calculation and Channel 2 RMS
Calculation sections. The Channel 1 and Channel 2 rms values
are then multiplied together in the apparent power signal
processing. Since no additional offsets are created in the
multiplication of the rms values, there is no specific offset
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| ADE7753-ARSZRL | 制造商:Analog Devices 功能描述: |
| ADE7753XRS | 制造商:Analog Devices 功能描述: |
| ADE7754 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Poly-phase Multi-Function Energy Metering IC with Serial Port |
| ADE7754AR | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:THREE PHASE ENERGY METER IC W/WATT & VA - Bulk 制造商:Analog Devices 功能描述:IC ENERGY METER |
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