- 您现在的位置：买卖IC网 > PDF目录20639 > ADE7878ACPZ (Analog Devices Inc)IC ENERGY METERING 3PH 40LFCSP PDF资料下载
参数资料
| 型号： | ADE7878ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 58/100页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 3PH 40LFCSP |
| 标准包装： | 1 |
| 输入阻抗： | 400 千欧 |
| 测量误差： | 0.2% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.4V |
| 电源电压： | 2.4 V ~ 3.7 V |
| 测量仪表类型： | 3 相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-WQ（6x6） |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页当前第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页
V rms × I rms × ? 1 +
? VAGAIN Register ? (41)
2 23
ADE7854/ADE7858/ADE7868/ADE7878
Apparent Power Gain Calibration
The average apparent power result in each phase can be scaled
by ±100% by writing to one of the phase’s VAGAIN 24-bit registers
(AVAGAIN, BVAGAIN, or CVAG AIN). The VAGAIN registers
are twos complement, signed registers and have a resolution of
2 ?23 /LSB. The function of the xVAGAIN registers is expressed
mathematically as
Average Apparent Power =
?
? ?
The output is scaled by –50% by writing 0xC00000 to the
xVAGAIN registers, and it is increased by +50% by writing
0x400000 to them. These registers calibrate the apparent power
ADE7878 for each phase.
section, the serial ports of the ADE78xx work on 32-, 16-, or 8-bit
words and the DSP works on 28 bits. Similar to registers presented
in Figure 35, the AVAGAIN, BVAGAIN, and CVAGAIN 24-bit
registers are accessed as 32-bit registers with the four MSBs
padded with 0s and sign extended to 28 bits.
Apparent Power Offset Calibration
Each rms measurement includes an offset compensation register
to calibrate and eliminate the dc component in the rms value
(see the Root Mean Square Measurement section). The voltage
Data Sheet
As stated in the Current Waveform Gain Registers, the serial
ports of the ADE78xx work on 32-, 16-, or 8-bit words. Similar
to the register presented in Figure 36, the VNOM 24-bit signed
register is accessed as a 32-bit register with the eight MSBs
padded with 0s.
Apparent Energy Calculation
Apparent energy is defined as the integral of apparent power.
Apparent Energy = ∫ s ( t ) dt (43)
signal in two stages (see Figure 73). The first stage is conducted
inside the DSP: every 125 μs (8 kHz frequency), the instanta-
neous phase apparent power is accumulated into an internal
register. When a threshold is reached, a pulse is generated at the
processor port and the threshold is subtracted from the internal
register. The second stage is conducted outside the DSP and
consists of accumulating the pulses generated by the processor
into internal 32-bit accumulation registers. The content of these
registers is transferred to the VA-hour registers, xVAHR, when
Calculation section illustrates this process. The VATHR 48-bit
register contains the threshold. Its value depends on how much
energy is assigned to one LSB of the VA-hour registers. When a
derivative of apparent energy (VAh) of [10 n VAh], where n is an
integer, is desired as one LSB of the xVAHR register; then, the
xVATHR register can be computed using the following equation:
and current rms values are multiplied together in the apparent
power signal processing. As no additional offsets are created in
the multiplication of the rms values, there is no specific offset
VATHR =
PMAX × f s × 3600 × 10 n
V FS × I FS
VNOM =
× 4 , 191 , 910
V
ApparentEn ergy = ∫ s ( t ) dt = Lim ? ∑ s ( nT ) × T ?
(44)
compensation in the apparent power signal processing. The offset
compensation of the apparent power measurement in each phase is
accomplished by calibrating each individual rms measurement.
Apparent Power Calculation Using VNOM
The ADE7854 / ADE7858 / ADE7868 / ADE7878 can compute the
apparent power by multiplying the phase rms current by an rms
voltage introduced externally in the VNOM 24-bit signed register.
When one of Bits[13:11] (VNOMCEN, VNOMBEN, or
VNOMAEN) in the COMPMODE register is set to 1, the
apparent power in the corresponding phase (Phase x for
VNOMxEN) is computed in this way. When the VNOMxEN
bits are cleared to 0, the default value, then the arithmetic
apparent power is computed.
The VNOM register contains a number determined by V, the
desired rms voltage, and V FS , the rms value of the phase voltage
when the ADC inputs are at full scale:
(42)
V FS
where V is the desired nominal phase rms voltage.
where:
PMAX = 33,516,139 = 0x1FF6A6B, the instantaneous power
computed when the ADC inputs are at full scale.
f S = 8 kHz, the frequency with which the DSP computes the
instantaneous power.
V FS , I FS are the rms values of phase voltages and currents when
the ADC inputs are at full scale.
VATHR is a 48-bit register. As previously stated in the Current
Similar to the WTHR register presented in Figure 69, the VATHR
register is accessed as two 32-bit registers (VATHR1 and VATHR0),
each having eight MSBs padded with 0s.
This discrete time accumulation or summation is equivalent to
integration in continuous time following the description in
Equation 44.
? ∞ ?
T → 0 ? n = 0 ?
where:
n is the discrete time sample number.
T is the sample period.
Rev. H | Page 58 of 100
相关PDF资料 |
PDF描述 |
|---|---|
| GBC06DREI-S13 | CONN EDGECARD 12POS .100 EXTEND |
| VI-J60-CX-F4 | CONVERTER MOD DC/DC 5V 75W |
| ECA10DCBT | CONN EDGECARD 20POS R/A .125 SLD |
| EL7242CSZ-T13 | IC DRIVER MOSFET DUAL HS 8-SOIC |
| ADE7169ASTZF16 | IC ENERGY METER 1PHASE 64LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7878ACPZ | 制造商:Analog Devices 功能描述:IC MULTIFUNCTION ENERGY METERING LFCSP40 |
| ADE7878ACPZ-RL | 功能描述:IC ENERGY METERING 3PH 40LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| ADE7878XCPZ | 制造商:Analog Devices 功能描述:POLY PHASE MULTIFUNCTION ENERGY METERING IC WITH TOTAL - Bulk |
| ADE7880 | 制造商:Analog Devices 功能描述:BOARD EVAL ENERGY METER ADE |
| ADE7880ACPZ | 功能描述:IC ENERGY METERING 3PH 40LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
发布紧急采购，3分钟左右您将得到回复。