Key facts
- Brand
- Analog Devices
- Model
- ADE7758
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-02
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Analog Devices AN-750 ADE7758 Phase Dropout Detection Application Note
The ADE7758 is a polyphase, multifunction energy metering IC that performs kWh, kVAh, kVARh, and rms current and rms voltage measurements. This document describes how phase dropout affects VAR calculation and provides solutions to detect and handle it.
Two solutions are presented for phase dropout detection. The first involves using a combination of zero-crossing timeout interrupts and voltage SAG interrupts to promptly identify the dropped phase. The second method suggests monitoring voltage rms values, though this is noted as not recommended due to higher system resource usage and power consumption.
Analog Devices ADE7758 specifications
| Active Energy Measurement Error | 0.1 % typ |
|---|---|
| IRMS Measurement Error | 0.5 % typ |
| VRMS Measurement Error | 0.5 % typ |
| Active Power Measurement Bandwidth | 14 kHz |
| Supply Voltage | 5 V ±5 % |
| Operating Temperature Range | –40 °C to +85 °C |
| Package | 24‑Lead Wide Body SOIC |
All Analog Devices ADE7758 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What happens to reactive power calculations if a phase used for frequency measurement drops out?
If the phase used for frequency measurement drops out, it can induce an error in the reactive power calculation of the other phases.
From: Analog Devices AN-750 ADE7758 Phase Dropout Detection Application Note
How long does it take for a zero-crossing timeout detection bit to be set after a phase drops out?
The corresponding zero-crossing timeout detection bit is set in the status register after 384/CLKIN x ZXTOUT seconds.
From: Analog Devices AN-750 ADE7758 Phase Dropout Detection Application Note
What supply voltage does the ADE7758 require?
The device operates from a single 5 V supply with a ±5 % tolerance.
How many pulse outputs are available on the ADE7758?
It provides two pulse outputs, one for active power and a second selectable between reactive and apparent power.
What supply voltage does the ADE7758 require?
It operates from a single 5 V supply and consumes about 70 mW typical.
How many pulse outputs are provided by the ADE7758?
The device has two pulse outputs: one for active power and a selectable one for reactive or apparent power.