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AFE031 Datasheet(PDF) 33 Page - Texas Instruments |
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AFE031 Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 59 page  0.0 3.3 Time (5 ms/div) 0 50 100 350 0 -350 + 330 kW 330 kW 330 kW 120 VAC to 240 VAC 50/60 Hz ZLLS410 or equivalent ZLLS410 or equivalent AVDD 3.3 V ZC IN ZC OUT AV DD AGND Zero Crossing Inside the AFE031 Copyright © 2017, Texas Instruments Incorporated 33 AFE031 www.ti.com SBOS531E – AUGUST 2010 – REVISED JUNE 2019 Product Folder Links: AFE031 Submit Documentation Feedback Copyright © 2010–2019, Texas Instruments Incorporated 9.2.6 Zero Crossing Detector Block The AFE031 includes two zero crossing detectors. Zero crossing detectors can be used to synchronize communications signals to the ac line or sources of noise. Typically, in single-phase applications, only a single zero crossing detector is used. In three-phase applications, both zero crossing detectors can be used; one component detects phase A, and one detects phase B. Phase C zero crossings can then be inferred from the data gathered from the other phases. Figure 37 shows the AFE031 configured for non-isolated zero crossing detection. Figure 37. Non-Isolated Zero Crossing Detection Using the AFE031 Non-isolated zero crossing waveforms are shown in Figure 38. Figure 38. Non-Isolated Zero Crossing Waveforms |
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