Smart electric meter

应用框图

As an essential component of the smart grid, smart electric meters play an indispensable role. A smart electric meter, centered around a smart chip, utilizes communication technology, computer technology, and more to accurately measure and bill electricity consumption, power, and time. Additionally, it can communicate with upper-level systems and manage electricity usage. The main components of a smart electric meter chip include electricity metering chips, smart meter MCUs, carrier communication chips, and power supply chips.

In single-phase electric meters, the traditional power supply scheme involves drawing power from an AC transformer. This power is then distributed to the mainboard, PLC, and RS485 through step-down converters and LDOs. Additionally, a low-static-current LDO battery is required to draw power from the battery as a backup power source.

In applications involving three-phase electric meters, concentrators, and data collectors, the traditional power supply scheme involves three AC transformers drawing power from the three-phase electric input. Typically, in the system load, power is required for GPRS, so compared to single-phase electric meters, it necessitates a step-down converter of around 3A. Meanwhile, SCT2632/0 supports input voltage up to 65V, effectively expanding the input voltage range for such applications.