An Energy Metering Chip With a Flexible Computing Engine

This paper presents an energy metering chip with a flexible computing engine. The flexible computing engine includes the metering program and a dedicated DSP. Besides providing the generally required energy metering data, the chip can also provide different energy metering and measurement data through the control registers accessible by a host MCU via the UART or SPI interface. The flexible computing engine adjusts the computing tasks of the DSP according to applications, reducing the amount of redundant computing and, therefore, reducing the power consumption. The chip can be used in general energy metering, fundamental energy metering, direct current (DC) energy metering, and various measurement and monitoring of the electricity signals. The energy metering chip is fabricated in a 0.11- $\mu$ m CMOS process. The chip meets the metering accuracy requirements by the international standard IEC-62053-21/22/23/24. The grid monitoring of the chip meets the international standard IEC-61000-4-30 Class S. The total power consumption when performing the energy metering is only 6.6 mW. The chip is currently in production.