This is an application note about ADE7752
The document details a reference design for a Class 1 meter intended for use in Wye-connected 3-phase, 4-wire distribution systems. It meets IEC 61036 and Indian Standards IS 13779-99 accuracy requirements, achieving less than 0.1% error over a 500:1 current dynamic range for balanced loads.
The design utilizes the ADE7752 single-chip solution which includes analog-to-digital converters and digital signal processing. Key features include differential output drivers for electromechanical counters, high-frequency pulse outputs for calibration, and logic outputs to indicate negative active power or miswiring.
| Accuracy Class | Class 1 |
|---|---|
| Current Dynamic Range | 500:1 |
| Maximum Current per Phase | 50 A |
| Meter Constant | 100 impulses/kWh |
| Line Voltage to Neutral | 240 V |
| Startup Current | 13.75 mA |
| No-Load Threshold | 3.3 W |
The design meets the IEC 61036 Class 1 meter accuracy requirement.
The meter was designed for a maximum current of 50 A per phase.
A high frequency output at the CF pin is used, which is calibrated to 1600 impulses/kWh.