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ADE7169ASTZF16 Datasheet(PDF) 46 Page - Analog Devices |
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ADE7169ASTZF16 Datasheet(HTML) 46 Page - Analog Devices |
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46 / 140 page  ADE7169F16 Preliminary Technical Data Rev. PrD | Page 46 of 140 current. Figure 24 shows the principle of a di/dt current sensor. MAGNETIC FIELD CREATED BY CURRENT (DIRECTLY PROPORTIONAL TO CURRENT) + EMF (ELECTROMOTIVE FORCE) – INDUCED BY CHANGES IN MAGNETIC FLUX DENSITY (di/dt) 02875-0-035 Figure 24. 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 generate 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 ADE7169F16 has a built-in digital integrator to recover the current signal from the di/dt sensor. The digital integrator on the Current Channel is switched off by default when the ADE7169F16 is powered up. Setting INTE bit in the MODE1 register (0x0B) turns on the integrator. Figure 25 to Figure 28 show the magnitude and phase response of the digital integrator. FREQUENCY (Hz) 10 0 –10 –20 –30 –40 –50 102 103 02875-0-036 Figure 25. Combined Gain Response of the Digital Integrator and Phase Compensator FREQUENCY (Hz) 102 103 02875-0-037 FREQ –88.0 –88.5 –89.0 –89.5 –90.0 –90.5 Figure 26. Combined Phase Response of the Digital Integrator and Phase Compensator FREQUENCY (Hz) –1.0 –6.0 40 70 45 50 55 60 65 –1.5 –2.0 –2.5 –3.5 –4.5 –5.5 –3.0 –4.0 –5.0 02875-0-038 Figure 27. Combined Gain Response of the Digital Integrator and Phase Compensator (40 Hz to 70 Hz) –89.75 –89.80 –89.85 –89.90 –89.95 –90.00 FREQUENCY (Hz) 40 45 70 50 55 60 65 –90.05 –89.70 02875-0-039 Figure 28. Combined Phase Response of the Digital Integrator and Phase Compensator (40 Hz to 70 Hz) Note that the integrator has a –20 dB/dec attenuation and an approximately –90° phase shift. When combined with a di/dt |
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