收藏本站
ADE7758
PHASE CALIBRATION USING PULSE OUTPUT
The ADE7758 includes a phase calibration register on each phase
Step 5: Calculate xPHCAL.
xPHCAL ?
Data Sheet
?
to compensate for small phase errors. Large phase errors should
be compensated by adjusting the antialiasing filters. The ADE7758
Phase Error ?
1
PHCAL _ LSB _ Weight
?
1 1 (54)
Line Period ( s ) 360 ?
phase calibration is a time delay with different weights in the
positive and negative direction (see the Phase Compensation
section). Because a current transformer is a source of phase error,
a fixed nominal value can be decided on to load into the xPHCAL
registers at power-up. During calibration, this value can be adjusted
for CT-to-CT error. Figure 79 shows the steps involved in
calibrating the phase using the pulse output.
START
where PHCAL_LSB_Weight is 1.2 μs if the %Error is negative or
2.4 μs if the %Error is positive (see the Phase Compensation
section).
If it is not known, the line period is available in the ADE7758
frequency register, FREQ (0x10). To configure line period
measurement, select the phase for period measurement in the
MMODE[1:0] and set LCYCMODE[7]. Equation 55 shows how
to determine the value that needs to be written to xPHCAL
using the period register measurement.
END
YES
ALL
PHASES
PHASE ERROR
CALIBRATED?
NO
STEP 1
SET UP PULSE
OUTPUT FOR
xPHCAL ?
Phase Error ?
9 . 6 ? s
PHCAL _ LSB _ Weight
?
FREQ [11 : 0]
360 ?
(55)
PHASE A, B, OR C
AND ENABLE CF
OUTPUTS
STEP 2
SET UP SYSTEM
FOR I TEST , V NOM ,
PF = 0.5, INDUCTIVE
STEP 3
MEASURE %
ERROR IN APCF
Example: Phase Calibration of Phase A Using Pulse Output
For this example, I TEST = 10 A, V NOM = 220 V, V FULLSCALE = 500 V,
I FULLSCALE = 130 A, MC = 3200 impulses/kWh, power factor = 0.5
inductive, and frequency = 50 Hz.
With Phase A contributing to CF, at I TEST , V NOM , and 0.5
inductive power factor, the example ADE7758 meter shows
0.9668 Hz on the pulse output. This is equivalent to ?1.122%
Phase Error ? ? ? ? – Arcsin ?
? ? 0 . 3713 ?
SELECT PHASE
FOR LINE PERIOD
MEASUREMENT
CONFIGURE
FREQ[11:0] FOR A
STEP 4
CALCULATE PHASE
ERROR (DEGREES)
error from the reference meter value using Equation 49.
The Phase Error in degrees using Equation 53 is 0.3713°.
? – 1.122% ?
? 100 % ? 3 ?
LINE PERIOD
MEASUREMENT
NO
PERIOD OF
SYSTEM
KNOWN?
YES
If at 50 Hz the FREQ register = 2083d, the value that should be
written to APHCAL is 17d, or 0x11 using Equation 55. Note
PERIOD USING
FREQ[11:0]
REGISTER
APHCAL ? 0 . 3713 ? ?
?
? 17 . 19 ? 17 ? 0 x 11
STEP 5
MEASURE
CALCULATE AND
WRITE TO
xPHCAL
Figure 79. Phase Calibration Using Pulse Output
Step 1: Step 1 and Step 3 from the gain calibration should be
repeated to configure the ADE7758 pulse output. Ensure the
xPHCAL registers are zero.
Step 2: Set the test system for I TEST , V NOM , and 0.5 power factor
inductive.
Step 3: Measure the percent error in the pulse output, APCF,
from the reference meter using Equation 49.
Step 4: Calculate the Phase Error in degrees by
that a PHCAL_LSB_Weight of 1.2 μs is used because the
%Error is negative.
9 . 6 μs 2083
1 . 2 μs 360 ?
Power Offset Calibration Using Pulse Output
Power offset calibration should be used for outstanding
performance over a wide dynamic range (1000:1). Calibration
of the power offset is done at or close to the minimum current
where the desired accuracy is required.
The ADE7758 has power offset registers for watts and VAR
(xWATTOS and xVAROS). Offsets in the VA measurement are
compensated by adjusting the rms offset registers (see the
Phase Error ? ? ? – Arcsin ?
?
?
? %Error ?
? 100 % ? 3 ?
(53)
Calibration of IRMS and VRMS Offset section). Figure 80
shows the steps to calibrate the power offsets using the pulse
outputs.
Rev. E | Page 46 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
ADE7761AARSZ-RL IC ENERGY METERING 1PHASE 20SSOP
ADE7761BARSZ-RL IC ENERGY METERING 1PHASE 20SSOP
ADE7768ARZ-RL IC ENERGY METERING 1PHASE 16SOIC
ADE7769ARZ-RL IC ENERGY METERING 1PHASE 16SOIC
ADM8843ACPZ-REEL7 IC LED DRVR WHITE BCKLGT 16LFCSP
ADP1653ACPZ-R7 IC LED DRVR PHOTO FLASH 16-LFCSP
ADP1712-EVALZ BOARD EVALUATION ADP1712
ADP1720-EVALZ BOARD EVAL FOR ADP1720-ADJ
相关代理商/技术参数
ADE7759 制造商:AD 制造商全称:Analog Devices 功能描述:Active Energy Metering IC with di/dt Sensor Interface
ADE7759ARS 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:否 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:*
ADE7759ARSRL 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:否 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:*
ADE7759ARSZ 功能描述:IC ENERGY METERING 1PHASE 20SSOP 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:*
ADE7759ARSZRL 功能描述:IC ENERGY METERING 1PHASE 20SSOP 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:*
ADE7760 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault Detection
ADE7760ARS 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP 制造商:Analog Devices 功能描述:ENERGY METER IC W/ ONCHIP FAULT & OSCIL. - Rail/Tube
ADE7760ARSRL 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R 制造商:Analog Devices 功能描述:ENERGY METER IC W/ONCHIP FAULT & OSCIL. - Tape and Reel