An Energy Metering and Measurement SoC With a Novel Low-Power DSP Architecture

Abstract

This paper presents an energy metering and measurement system-on-a-chip (SoC) with a novel low-power digital signal processor (DSP) architecture. The Cotex-M0-based SoC can measure electricity signals and meter active and reactive energy. It can also monitor the grid by directly accessing and analyzing the waveforms. The measurement and metering algorithms are implemented in a novel DSP architecture with a dedicated reduced instruction set. The filter coefficients and its operating frequency in the default program of DSP can be reprogrammed independently. It can be applied in different applications where demands for metering bandwidth and response time are different. The DSP program can also be reprogrammed by the software if the default program is not desired. The SoC is implemented in a 0.11- ${\mu }\text{m}$ CMOS process. It achieves active and reactive energy metering accuracy of 0.1% with a dynamic range of 5000:1. The analog power supply is 3.3 V and the digital power supply is 1.8 V. The total power consumption of the SoC is ca 17.63 mW with the DSP consuming ca 1.0 mW. Compared with other commercial metering and measurement SoCs, the presented SoC achieves higher metering accuracy and lower power consumption. It is currently in production.