- 您现在的位置：买卖IC网 > PDF目录223307 > ADE7878ACPZ (ANALOG DEVICES INC) Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind PDF资料下载
参数资料
| 型号： | ADE7878ACPZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40 |
| 文件页数： | 43/96页 |
| 文件大小： | 1096K |
| 代理商： | ADE7878ACPZ |
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页当前第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
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 48 of 96
CFWATTHR 32-bit signed registers. The active energy register
content can roll over to full-scale negative (0x80000000) and
continue increasing in value when the active power is positive.
Conversely, if the active power is negative, the energy register
underflows to full-scale positive (0x7FFFFFFF) and continues
decreasing in value.
Bit 0 (AEHF) in the STATUS0 register is set when Bit 30 of
one of the xWATTHR registers changes, signifying one of these
registers is half full. If the active power is positive, the watt-hour
register becomes half full when it increments from 0x3FFF FFFF to
0x4000 0000. If the active power is negative, the watt-hour
register becomes half full when it decrements from 0xC000
0000 to 0xBFFF FFFF. Similarly, Bit 1 (FAEHF) in STATUS0
register, is set when Bit 30 of one of the xFWATTHR registers
changes, signifying one of these registers is half full.
Setting Bits[1:0] in the MASK0 register enable the FAEHF and
AEHF interrupts, respectively. If enabled, the IRQ0 pin is set
low and the status bit is set to 1 whenever one of the energy
registers, xWATTHR (for the AEHF interrupt) or xFWATTHR
(for the FAEHF interrupt), become half full. The status bit is
cleared and the IRQ0 pin is set to logic high by writing to the
STATUS0 register with the corresponding bit set to 1.
Setting Bit 6 (RSTREAD) of the LCYCMODE register enables a
read-with-reset for all watt-hour accumulation registers, that is,
the registers are reset to 0 after a read operation.
Integration Time Under Steady Load
The discrete time sample period (T) for the accumulation register
is 125 μs (8 kHz frequency). With full-scale sinusoidal signals
on the analog inputs and the watt gain registers set to 0x00000, the
average word value from each LPF2 is PMAX = 33,516,139 =
0x1FF6A6B. If the WTHR register threshold is set at the PMAX
level, this means the DSP generates a pulse that is added at watt-
hour registers every 125 μs.
The maximum value that can be stored in the watt-hour
accumulation register before it overflows is 231 1 or
0x7FFFFFFF. The integration time is calculated as
Time = 0x7FFF,FFFF × 125 μs = 74 hr 33 min 55 sec
(27)
Energy Accumulation Modes
The active power accumulated in each watt-hour accumulation
32-bit register (AWATTHR, BWATTHR, CWATTHR,
AFWATTHR, BFWATTHR, and CFWATTHR) depends on the
configuration of Bit 5 and Bit 4 (CONSEL bits) in the ACCMODE
register. The various configurations are described in Table 15.
Table 15. Inputs to Watt-Hour Accumulation Registers
CONSEL
AWATTHR
BWATTHR
CWATTHR
00
VA × IA
VB × IB
VC × IC
01
VA × IA
0
VC × IC
10
VA × IA
VB × IB
VC × IC
VB = VA VC
11
VA × IA
VB × IB
VC × IC
VB = VA
Depending on the polyphase meter service, choose the appro-
priate formula to calculate the active energy. The American
ANSI C12.10 standard defines the different configurations of
the meter. Table 16 describes which mode to choose in these
various configurations.
Table 16. Meter Form Configuration
ANSI Meter Form
Configuration
CONSEL
5S/13S
3-wire delta
01
6S/14S
4-wire wye
10
8S/15S
4-wire delta
11
9S/16S
4-wire wye
00
Bits[1:0] (WATTACC[1:0]) in the ACCMODE register determine
how the CF frequency output can be generated as a function of
the total and fundamental active powers. Whereas the watt-hour
accumulation registers accumulate the active power in a signed
format, the frequency output can be generated in signed mode
or in absolute mode as a function of the WATTACC[1:0] bits.
See the Energy-to-Frequency Conversion section for details.
Line Cycle Active Energy Accumulation Mode
In line cycle energy accumulation mode, the energy accumula-
tion is synchronized to the voltage channel zero crossings such
that active energy is accumulated over an integral number of
half line cycles. The advantage of summing the active energy
over an integer number of line cycles is that the sinusoidal compo-
nent in the active energy is reduced to 0. This eliminates any
ripple in the energy calculation and allows the energy to be
accumulated accurately over a shorter time. By using the line
cycle energy accumulation mode, the energy calibration can be
greatly simplified, and the time required to calibrate the meter
can be significantly reduced. In line cycle energy accumulation
mode, the ADE7854/ADE7858/ADE7868/ADE7878 transfer the
active energy accumulated in the 32-bit internal accumulation
registers into the xWATHHR or xFWATTHR registers after an
integral number of line cycles, as shown in Figure 65. The
number of half line cycles is specified in the LINECYC register.
相关PDF资料 |
PDF描述 |
|---|---|
| ADE7878ACPZ-RL | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| ADG529FTQ | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, CDIP18 |
| ADJ24006 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.042A (COIL), 6VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
| ADJ24012 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.021A (COIL), 12VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
| ADJ24024 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.01A (COIL), 24VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
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。