ADE7753ARS datasheet(10/37 Pages) AD

Nome de Peças	ADE7753ARS

Descrição Electrónicos	Active and Apparent Energy Metering IC with di/dt sensor interface

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Fabricante Electrônico	AD [Analog Devices]

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ADE7753

–10–

REV. PrF 10/02

PRELIMINARY TECHNICAL DATA

Waveform register will give an indication of the offset in the

channel. This offset can be canceled by writing an equal and

opposite offset value to the relevant offset register. The offset

correction can be confirmed by performing another read.

Note when adjusting the offset of Channel 1, one should

disable the digital integrator and the HPF.

CH1OS[5:0]

00h

1Fh

3Fh

+50mV

-50mV

0mV

Offset

Adjust

01, 1111b

11, 1111b

Sign + 5 Bits

Figure 4– Channel Offset Correction Range (Gain = 1)

Gain

Correctable Span

LSB Size

1

±50mV

1.61mV/LSB

2

±37mV

1.19mV/LSB

4

±30mV

0.97mV/LSB

8

±26mV

0.84mV/LSB

16

±24mV

0.77mV/LSB

Table II

Offset Correction range

di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR

di/dt sensor detects changes in magetic field caused by ac

current. Figure 5 shows the principle of a di/dt current

sensor.

+

-

EMF (electromotive force)

induced by changes in

magnetic flux density (d/dt)

Magnetic field created by current

(directly propor tional to current)

Figure 5– 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. The

changes in the magnetic flux density passing through a

conductor loop generates an electromotive force (EMF)

between the two ends of the loop. The EMF is a voltage signal

which 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 needs to 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 ADE7753 has a

built-in digital integrator to recover the current signal from

the di/dt sensor. The digital integrator on Channel 1 is

switched off by default when the ADE7753 is powered up.

Setting the MSB of CH1OS register will turn on the

integrator. Figures 6 to 9 show the magnitude and phase

response of the digital integrator.

10

2

10

3

-50

-40

-30

-20

-10

0

10

FREQUENCY-Hz

Figure 6– Combined gain response of the digital integrator

and phase compensator

10

2

10

3

-90.5

-90

-89.5

-89

-88.5

-88

FREQUENCY-Hz

Figure 7– Combined phase response of the digital integra-

tor and phase compensator

40

45

50

55

60

65

70

-6

-5.5

-5

-4.5

-4

-3.5

-3

-2.5

-2

-1.5

-1

FREQUENCY-Hz

Figure 8– Combined gain response of the digital integrator

and phase compensator (40Hz to 70Hz)

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