参数资料
| 型号： | EVAL-ADE7754EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALAUTION FOR ADE7754 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 已用 IC / 零件： | ADE7754 |
| 已供物品： | 板 |
| 相关产品： | ADE7754ARZRLCT-ND - IC ENERGY METERING 3PHASE 24SOIC ADE7754ARZRLTR-ND - IC ENERGY METERING 3PHASE 24SOIC ADE7754ARZ-ND - IC ENERGY METERING 3PHASE 24SOIC |
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ADE7754
VPEAK[7:0]
V AP , V BP , OR V CP
PKV RESET
0.07
0.06
0.05
0.04
LOW WHEN
RSTATUS
0.03
PKV INTERRUPT
FLAG (BIT C OF
STATUS REGISTER)
READ
RSTATUS
REGISTER
REGISTER
IS READ
0.02
0.01
0
–0.01
Figure 17. Peak Detection
0
100
200
300
400
500
600
700
800
900
1k
FREQUENCY (Hz)
Bits 2 and 3 of the measurement mode register define the phase
supporting the peak detection. Current and voltage of this phase
can be monitored at the same time. Figure 17 shows a line
voltage exceeding a threshold set in the voltage peak register
(VPEAK[7:0]). The voltage peak event is recorded by setting
the PKV flag in the interrupt status register. If the PKV enable
bit is set to Logic 1 in the interrupt enable register, the IRQ
logic output goes active low. See the Interrupts section.
Peak Level Set
The contents of the VPEAK and IPEAK registers compare to
the absolute value of the most significant byte output of the
selected voltage and current channels, respectively. Thus, for
example, the nominal maximum code from the current channel
ADC with a full-scale signal is 28F5C2h. See the Current
Channel Sampling section. Therefore, writing 28h to the
IPEAK register will put the current channel peak detection level
at full scale and set the current peak detection to its least sensi-
Figure 18a. Phase Response of the HPF and
Phase Compensation (10 Hz to 1 kHz)
0.010
0.008
0.006
0.004
0.002
0
–0.002
–0.004
tive value. Writing 00h puts the current channel detection level at
40
45
50
55
60
65
70
zero. The detection is done when the content of the IPEAK
register is smaller than the incoming current channel sample.
FREQUENCY (Hz)
Figure 18b. Phase Response of the HPF and
Phase Compensation (40 Hz to 70 Hz)
TEMPERATURE MEASUREMENT
The ADE7754 also includes an on-chip temperature sensor. A
temperature measurement is made every 4/CLKIN seconds.
The output from the temperature sensing circuit is connected
to an ADC for digitizing. The resulting code is processed and
placed into the temperature register (TEMP[7:0]) which can
be read by the user and has an address of 08h. See the Serial
Interface section. The contents of the temperature register are
signed (twos complement) with a resolution of 4 ° C/LSB. The
temperature register produces a code of 00h when the ambient
temperature is approximately 129 ° C. The value of the register is
temperature register = (temperature ( ° C) – 129)/4. The tempera-
ture in the ADE7754 has an offset tolerance of approximately
± 5 ° C. The error can be easily calibrated out by an MCU.
PHASE COMPENSATION
When the HPFs are disabled, the phase difference between the
current channel (IA, IB, and IC) and the voltage channel (VA,
VB, and VC) is zero from dc to 3.3 kHz. When the HPFs are
enabled, the current channels have a phase response as shown in
Figure 18a and 18b. The magnitude response of the filter is
shown in Figure 18c. As seen from in the plots, the phase response
is almost zero from 45 Hz to 1 kHz. This is all that is required
in typical energy measurement applications.
0.010
0.008
0.006
0.004
0.002
0
–0.002
–0.004
44 46 48 50 52 54 56
FREQUENCY (Hz)
Figure 18c. Gain Response of HPF and Phase Com-
pensation (Deviation of Gain as % of Gain at 54 Hz)
Despite being internally phase compensated, the ADE7754 must
work with transducers that may have inherent phase errors. For
example, a phase error of 0.1 ° to 0.3 ° is not uncommon for a CT
(current transformer). These phase errors can vary from part to
part, and they must be corrected in order to perform accurate
power calculations. The errors associated with phase mismatch
–14 –
REV. 0
相关PDF资料 |
PDF描述 |
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| EVAL-ADE7755ZEB | BOARD EVALUATION FOR AD7755 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADE7755EB | 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk |
| EVAL-ADE7755EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755EBZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755ZEB | 功能描述:BOARD EVALUATION FOR AD7755 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-ADE7756EB | 制造商:Analog Devices 功能描述:EVAL BD DOCUMENTATION ADE7756 ENERGY METERING IC - Bulk 制造商:Rochester Electronics LLC 功能描述: |
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