参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADE7763 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 已用 IC / 零件： | ADE7763 |
| 已供物品： | 板 |
| 相关产品： | ADE7763ARSZRLDKR-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLCT-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZ-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLTR-ND - IC ENERGY METERING 1PHASE 20SSOP |
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Data Sheet
V OS ? I OS
V ? I
2
DC COMPONENT (INCLUDING ERROR TERM)
IS EXTRACTED BY THE LPF FOR REAL
POWER CALCULATION
I OS ? V
V OS ? I
ADE7763
The current and voltage rms offsets can be adjusted with the
sections.
di/dt CURRENT SENSOR AND
DIGITAL INTEGRATOR
A di/dt sensor detects changes in magnetic field caused by ac
0
?
2 ?
current. Figure 27 shows the principle of a di/dt current sensor.
FREQUENCY (RAD/S)
Figure 25. Effect of Channel Offsets on the Real Power Calculation
The contents of the offset correction registers are 6-bit, sign and
magnitude coded. The weight of the LSB depends on the gain
setting, i.e., 1, 2, 4, 8, or 16. Table 6 shows the correctable offset
span for each of the gain settings and the LSB weight (mV) for
the offset correction registers. The maximum value that can be
register contents and the offset (mV) on the analog inputs for a
gain of 1. To perform an offset adjustment, connect the analog
inputs to AGND; there should be no signal on either Channel 1
or Channel 2. A read from Channel 1 or Channel 2 using the
waveform register indicates the offset in the channel. This offset
can be canceled by writing an equal and opposite offset value to
the Channel 1 offset register, or an equal value to the Channel 2
offset register. The offset correction can be confirmed by
performing another read. Note that when adjusting the offset of
Channel 1, the digital integrator and the HPF should be
disabled.
Table 6. Offset Correction Range—Channels 1 and 2
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
+ EMF (ELECTROMOTIVE FORCE)
– INDUCED BY CHANGES IN
MAGNETIC FLUX DENSITY (di/dt)
Figure 27. Principle of a di/dt Current Sensor
The flux density of a magnetic field induced by a current is
directly proportional to the magnitude of the current. Changes
in the magnetic flux density passing through a conductor loop
generate an electromotive force (EMF) between the two ends of
the loop. The EMF is a voltage signal that is proportional to the
di/dt of the current. The voltage output from the di/dt current
sensor is determined by the mutual inductance between the
current-carrying conductor and the di/dt sensor. The current
signal must be recovered from the di/dt signal before it can be
used. An integrator is therefore necessary to restore the signal to
its original form. The ADE7763 has a built-in digital integrator
Gain
1
2
4
8
16
Correctable Span
±50 mV
±37 mV
±30 mV
±26 mV
±24 mV
LSB Size
1.61 mV/LSB
1.19 mV/LSB
0.97 mV/LSB
0.84 mV/LSB
0.77 mV/LSB
to recover the current signal from the di/dt sensor. The digital
integrator on Channel 1 is switched off by default when the
ADE7763 is powered up. Setting the MSB of CH1OS register
turns on the integrator. Figure 28, Figure 29, Figure 30, and
integrator.
10
CH1OS[5:0]
0
0x1F
0x00
01,1111b
SIGN + 5 BITS
–10
–20
–50mV
0mV
+50mV
OFFSET
ADJUST
–30
0x3F
11,1111b SIGN + 5 BITS
–40
Figure 26. Channel 1 Offset Correction Range (Gain = 1)
–50
10 2
10 3
FREQUENCY (Hz)
Figure 28. Combined Gain Response of the
Digital Integrator and Phase Compensator
Rev. C | Page 15 of 56
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