收藏本站

ADE7759
INSTANTANEOUS p(t) = V
POWER SIGNAL
I –V
I
cos(2 t)
1999Ah
ACTIVE REAL POWER
SIGNAL = V I
13333h
+30% FS
CCCDh
+20% FS
POSITIVE
POWER
VI
6666h
+10% FS
CCCDh
00000h
F999Ah
–10% FS
F3333h
–20% FS
NEGATIVE
POWER
00000h
ECCCDh
000h
7FFh
800h
–30% FS
CURRENT
{APGAIN [11:0]}
i(t) = 2
I
sin( t)
CHANNEL 1 (ACTIVE POWER)
VOLTAGE
CALIBRATION RANGE
v(t) = 2
V
sin( t)
Figure 35. Active Power Calculation Output Range
Figure 32. Active Power Calculation
ENERGY CALCULATION
0
As stated earlier, power is defined as the rate of energy flow.
This relationship can be expressed mathematically as:
–4
P =
dE
dt
(5)
–8
where P = power and E = energy.
–12
Conversely, energy is given as the integral of power:
–16
E = ∫ Pdt
(6)
The AD7759 achieves the integration of the active power signal
–20
by continuously accumulating the active power signal in the
40-bit active energy register (ASENERGY[39:0]). This discrete
time accumulation or summation is equivalent to integration in
–24
1
3
10
30
100
continuous time. Equation 7 expresses this relationship:
E = ∫ P ( t ) dt = Lim ? ∑ p ( nT ) × T ?
? ?
n = 0
FREQUENCY – Hz
Figure 33. Frequency Response of LPF2
Figure 34 shows the signal processing chain for the active power
calculation in the ADE7759. As explained, the active power is
calculated by low pass filtering the instantaneous power signal.
? ∞ ?
T → 0
where n is the discrete time sample number and T is the
sample period.
(7)
The discrete time sample period (T) for the accumulation regis-
HPF
ACTIVE POWER
SIGNAL – P
ter in the ADE7759 is 1.1 μ s (4/CLKIN). As well as calculating
I
CURRENT SIGNAL – i(t)
MULTIPLIER
20
LPF2
CCCDh
the energy, this integration removes any sinusodial components
which may be in the active power signal.
Figure 36 shows a graphical representation of this discrete time
integration or accumulation. The active power signal in the wave-
1
V
VOLTAGE SIGNAL – v(t)
INSTANTANEOUS POWER SIGNAL – p(t)
–40% TO +40% FS
1999Ah
00h
form register is continuously added to the active energy register.
This addition is a signed addition; therefore negative energy will be
subtracted from the active energy contents.
As shown in Figure 36, the active power signal is accumulated
in a 40-bit signed register (AENERGY[39:0]). The active
Figure 34. Active Power Signal Processing
Shown in Figure 35 is the maximum code (hexadecimal) output
range for the active power signal (LPF2) when the digital inte-
grator is disabled. Note that when the integrator is enabled, the
output range changes depending on the input signal frequency.
Furthermore, the output range can also be changed by the
active power gain register—see Channel 1 ADC section. The
minimum output range is given when the active power gain
register contents are equal to 800h, and the maximum range is
given by writing 7FFh to the active power gain register. This
can be used to calibrate the active power (or energy) calculation
in the ADE7759.
REV. A
power signal can be read from the waveform register by setting
MODE[14:13] = 0, 0 and setting the WSMP bit (Bit 3) in
the interrupt enable register to 1. Like Channel 1 and Channel 2
waveform sampling modes, the waveform data is available at
sample rates of 27.9 kSPS, 14 kSPS, 7 kSPS, or 3.5 kSPS—see
Figure 24. Figure 37 shows this energy accumulation for full-scale
signals (sinusodial) on analog inputs. The three curves displayed
illustrate the minimum period of time it takes the energy register to
roll over when the active power gain register contents are 7FFh,
000h, and 800h. The active power gain register is used to carry out
power calibration in the ADE7759. As shown, the fastest
integration time will occur when the active power gain register is
set to maximum full scale, i.e., 7FFh.
–21 –
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EVAL-ADE7762EBZ BOARD EVALUATION FOR ADE7762
EVAL-ADE7763ZEB BOARD EVALUATION FOR ADE7763
EVAL-ADE7816EBZ BOARD EVALUATION FOR ADE7816
EVAL-ADE7878EBZ BOARD EVAL FOR ADE7878
EVAL-ADE7880EBZ BOARD EVAL FOR ADE7880
EVAL-ADE7953EBZ BOARD EVAL FOR ADE7953
EVAL-ADF4002EBZ1 BOARD EVAL FOR ADF4002
EVAL-ADG788EBZ BOARD EVALUATION FOR ADG788
相关代理商/技术参数
EVAL-ADE7762EBZ 功能描述:BOARD EVALUATION FOR ADE7762 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-ADE7763EB 制造商:Analog Devices 功能描述:EVALUATION BOARD DOCUMENTATION ADE7763 ENERGY METERING IC
EVAL-ADE7763ZEB 功能描述:BOARD EVALUATION FOR ADE7763 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:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源
EVAL-ADE7816EBZ 功能描述:BOARD EVALUATION FOR ADE7816 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:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源
EVAL-ADE7854EBZ 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Boxed Product (Development Kits)
EVAL-ADE7858EBZ 制造商:AD 制造商全称:Analog Devices 功能描述:Poly Phase Multifunction Energy Metering IC with per Phase Active and Reactive Powers
EVAL-ADE7878EBZ 功能描述:BOARD EVAL FOR ADE7878 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:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板
EVAL-ADE7880EBZ 功能描述:BOARD EVAL FOR ADE7880 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板