参数资料
| 型号： | EVAL-ADE7754EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALAUTION FOR ADE7754 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 已用 IC / 零件： | ADE7754 |
| 已供物品： | 板 |
| 相关产品： | ADE7754ARZRLCT-ND - IC ENERGY METERING 3PHASE 24SOIC ADE7754ARZRLTR-ND - IC ENERGY METERING 3PHASE 24SOIC ADE7754ARZ-ND - IC ENERGY METERING 3PHASE 24SOIC |
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ADE7754
The discrete time sample period (T) for the accumulation
AENERGY[23:0]
register in the ADE7754 is 0.4 μ s (4/10 MHz). In addition to
calculating the energy, this integration removes any sinusoidal
7F,FFFFh
AWG = BWG = CWG = 3FFh
AWG = BWG = CWG = 000h
component that may be in the active power signal. Figure 27
shows a graphical representation of this discrete time integration
or accumulation. The active power signal is continuously added
3F,FFFFh
AWG = BWG = CWG = 800h
to the internal energy register. Because this addition is a signed
00,0000h
44
88
132
176
220
264
addition, negative energy will be subtracted from the active
energy contents.
AENERGY[23:0]
40,0000h
23
0
80,0000h
TIME (sec)
53
WDIV
%
0
Figure 28. Energy Register Roll-Over Time for Full-
Scale Power (Minimum and Maximum Power Gain)
Note that the active energy register contents roll over to full-
scale negative (80,0000h) and continue increasing in value
when the power or energy flow is positive. See Figure 28.
TOTAL ACTIVE POWER
T
+
53
0
Conversely, if the power is negative, the energy register would
underflow to full scale positive (7F,FFFFh) and continue
+
decreasing in value.
By using the interrupt enable register, the ADE7754 can be
26667h
00000h
T
ACTIVE POWER
SIGNAL (P)
TIME (nT)
TOTAL ACTIVE POWER IS
ACCUMULATED (INTEGRATED) IN
THE ACTIVE ENERGY REGISTER
configured to issue an interrupt ( IRQ ) when the active energy
register is half full (positive or negative).
Integration Times Under Steady Load
As mentioned in the last section, the discrete time sample
period (T) for the accumulation register is 0.4 μ s (4/CLKIN).
With full-scale sinusoidal signals on the analog inputs and the
watt gain registers set to 000h, the average word value from
each LPF2 is D1B717h. See Figures 22 and 24. The maximum
Figure 27. Active Energy Calculation
The 54-bit value of the internal energy register is divided by
WDIV. If the value in the WDIV register is 0, then the internal
active energy register is divided by 1. WDIV is an 8-bit unsigned
register. The upper 24-bits of the result of the division are then
value that can be stored in the active energy register before it
overflows is 2 23 – 1 or 7F,FFFFh. As the average word value is
added to the internal register, which can store 2 53 – 1 or
1F,FFFF,FFFF,FFFFh before it overflows, the integration time
under these conditions with WDIV = 0 is calculated as follows:
available in the 24-bit active energy register. The AENERGY
and RAENERGY registers read the same internal active energy
register. They differ by the state in which they are leaving the
Time =
1 F , FFFF , FFFF , FFFFh
3 × D 1 B 717 h
× 0 . 4 μ s = 88 s
internal active energy register after a read. Two operations are
held when reading the RAENERGY register: read and reset to 0
When WDIV is set to a value different from 0, the integration
time varies as shown in Equation 10.
the internal active energy register. Only one operation is held
when reading the AENERGY register: read the internal active
Time = Time WDIV = 0 × WDIV
(10)
energy register.
Figure 28 shows the energy accumulation for full-scale (sinusoidal)
signals on the analog inputs. The three displayed curves illustrate
the minimum time it takes the energy register to roll over when
the individual watt gain registers contents are all equal to 3FFh,
000h, and 800h. The watt gain registers are used to carry out a
power calibration in the ADE7754. As shown, the fastest
integration time occurs when the watt gain registers are set to
maximum full scale, i.e., 3FFh.
The WDIV register can be used to increase the time before the
active energy register overflows, thereby reducing the communi-
cation needs with the ADE7754.
Energy to Frequency Conversion
The ADE7754 also provides energy-to-frequency conversion
for calibration purposes. After initial calibration at manufac-
ture, the manufacturer or the customer will often verify the
energy meter calibration. One convenient way to verify the
meter calibration is for the manufacturer to provide an output
frequency proportional to the energy or active power under
steady load conditions. This output frequency can provide a
simple single-wire, optically isolated interface to external cali-
bration equipment. Figure 29 illustrates the energy to frequency
conversion in the ADE7754.
–20 –
REV. 0
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-ADE7755ZEB | BOARD EVALUATION FOR AD7755 |
| EVAL-ADE7758ZEB | BOARD EVAL FOR AD7758 |
| EVAL-ADE7759EBZ | BOARD EVALUATION FOR ADE7759 |
| EVAL-ADE7762EBZ | BOARD EVALUATION FOR ADE7762 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADE7755EB | 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk |
| EVAL-ADE7755EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755EBZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755ZEB | 功能描述:BOARD EVALUATION FOR AD7755 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EVAL-ADE7756EB | 制造商:Analog Devices 功能描述:EVAL BD DOCUMENTATION ADE7756 ENERGY METERING IC - Bulk 制造商:Rochester Electronics LLC 功能描述: |
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