收藏本站

Data Sheet
ROOT MEAN SQUARE MEASUREMENT
ADE7953
1
∫ f
RMS =
( t ) dt
1
∑ f 2 [ n ]
Root mean square (rms) is a measurement of the magnitude
of an ac signal. Specifically, the rms of an ac signal is equal to
the amount of dc required to produce an equivalent amount
of power in the load. The rms is expressed mathematically in
Equation 1.
t
2
t 0
For time-sampled signals, rms calculation involves squaring
the signal, taking the average, and obtaining the square root.
N
RMS =
N n = 1
As implied by Equation 2, the rms measurement contains
information from the fundamental and all harmonics over
a 1.23 kHz measurement bandwidth.
The ADE7953 provide rms measurements for Current
Channel A, Current Channel B, and the voltage channel
simultaneously. These measurements have a settling time of
approximately 200 ms and are updated at a rate of 6.99 kHz.
(1)
(2)
the IRMSA (Address 0x21A and Address 0x31A) and IRMSB
(Address 0x21B and Address 0x31B) registers, respectively. Both
of these registers are updated at a rate of 6.99 kHz. With full-
scale inputs on Current Channel A and Current Channel B,
the expected reading on the IRMSA and IRMSB register is
9032007d.
Because the LPF used in the rms signal path is not ideal, it is
recommended that the IRMSx registers be read synchronously
to the zero-crossing signal (see the Zero-Crossing Detection
section). This helps to stabilize reading-to-reading variation
by removing the effect of any 2ω ripple present on the rms
measurement.
VOLTAGE CHANNEL RMS CALCULATION
The ADE7953 provides an rms measurement on the voltage
channel. Figure 43 shows the signal path for this calculation.
VRMSOS[23:0]
2 12
√
X 2 VRMS[23:0]
FROM HPF
CURRENT CHANNEL RMS CALCULATION
The ADE7953 provides rms measurements for both Current
Channel A and Current Channel B. Figure 42 shows the signal
path for this calculation. The signal processing is identical for
Current Channel A and Current Channel B.
×IRMSOS[23:0]
2 12
CURRENT
VOLTAGE
SIGNAL
LPF
Figure 43. Voltage Channel RMS Signal Processing
As shown in Figure 43, the voltage channel ADC output
samples are used to continually compute the rms. The rms is
achieved by low-pass filtering the square of the output signal
and then taking a square root of the result. The 24-bit unsigned
voltage channel rms measurement is available in the VRMS
register (Address 0x21C and Address 0x31C). This register is
updated at a rate of 6.99 kHz. With full-scale inputs on the
SIGNAL
FROM HPF OR
INTEGRATOR
(IF ENABLED)
X 2
LPF
√
IRMSx[23:0]
voltage channel, a VRMS reading of 9032007d can be expected.
Because the LPF used in the rms signal path is not ideal, it is
Figure 42. Current Channel RMS Signal Processing
As shown in Figure 42, the current channel ADC output samples
are used to continually compute the rms. The rms is achieved by
low-pass filtering the square of the output signal and then taking
recommended that the VRMS register be read synchronously to
the zero-crossing signal (see the Zero-Crossing Detection section).
This helps to stabilize reading-to-reading variation by removing
the effect of any 2ω ripple present on the rms measurement.
a square root of the result. The 24-bit unsigned rms measurements
for Current Channel A and Current Channel B are available in
Rev. B | Page 23 of 72
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-ADF4002EBZ1 BOARD EVAL FOR ADF4002
EVAL-ADG788EBZ BOARD EVALUATION FOR ADG788
EVAL-ADM1021AEB BOARD EVAL FOR ADM1021
EVAL-ADM1023EB BOARD EVAL FOR ADM1023
EVAL-ADM1031EB BOARD EVAL FOR ADM1031
EVAL-ADM1062TQEBZ BOARD EVALUATION FOR ADM1062TQ
EVAL-ADM1075CEBZ BOARD EVAL FOR ADM1075
EVAL-ADM1087EBZ BOARD EVALUATION FOR ADM1087
相关代理商/技术参数
EVAL-ADF4001EBZ2 制造商:Analog Devices 功能描述:Evaluation Board For Pll Frequency Synthesizer 制造商:Analog Devices 功能描述:ADF4001 PLL SYNTHESIZER EVAL BOARD
EVAL-ADF4002EB1 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk
EVAL-ADF4002EBZ1 功能描述:BOARD EVAL FOR ADF4002 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
EVAL-ADF4007EBZ1 功能描述:BOARD EVALUATION FOR ADF4007EB1 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-ADF4106EB1 制造商:Analog Devices 功能描述:PLL, Frequency Synthesizer
EVAL-ADF4106EBZ1 功能描述:BOARD EVAL FOR ADF4106 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-ADF4108EB1 制造商:AD 制造商全称:Analog Devices 功能描述:PLL Frequency Synthesizer
EVAL-ADF4108EBZ1 制造商:Analog Devices 功能描述:Evaluation Board For ADF4108 制造商:Analog Devices 功能描述:ADF4108 Evaluation Board 制造商:Analog Devices 功能描述:ADF4108, PLL FREQUENCY SYNTHESIZER, EVAL BOARD; Silicon Manufacturer:Analog Devices; Silicon Core Number:ADF4108; Kit Application Type:Clock & Timing; Application Sub Type:PLL Frequency Synthesizer; MCU Supported Families:ADF4108 ;RoHS Compliant: Yes