An Energy Metering And Measurement DSP Architecture And Implementation

With the accelerated construction of the ubiquitous power Internet of Things,more sensors need to be deployed in the sensing layer.They not only provide the energy metering but also the measurement of the electrical signals.The implementation of these functions by software does not guarantee timeliness and reliability,and the implementation of application specific integrated circuit(ASIC)lacks the flexibility.Therefore,this paper proposes a reduced instruction set for energy metering and electrical signal measurement.It also provides three DSP architectures,which includes the basic DSP architecture,the flexible programmable DSP architecture and dual-core DSP architecture.At first,the basic DSP architecture is implemented in a two-stage pipeline for the basic architecture for the computation requirements of the energy metering algorithm.By adopting this architecture,the world's first energy metering chip without external crystal is proposed.By reducing the number of crystal oscillators and reducing the number of optocouplers required for communication,the production costs of smart meters and intelligent monitoring equipment are greatly reduced.The power consumption of digital integrated circuits in this chip is also lower than that of commercial chips of the same type.Secondly,aiming at the wide application scenarios of ubiquitous power Internet of Things,this paper proposes a flexible programmable DSP architecture based on the basic DSP architecture.The flexible programmable DSP architecture achieves the programmability of the operating frequency,the metering bandwidth,the response time and the settling time of digital filters.Based on this DSP architecture,this paper proposes an energy metering and measurement chip with a flexible computing engine.It can perform the total energy metering,the fundamental energy metering and the direct current energy metering.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.By the program multiplexing,the fundamental active power,the fundamental reactive power or the fundamental real mean square(RMS)can be selected.Besides,the chip also integrates the measurement unit according to the IEC-61000-4-30.The voltage amplitude,voltage swells and dips,voltage interruption and transient voltage are measured based on the 1/2-cycle voltage RMS or 10-cycle/12-cycle voltage RMS.Furthermore,in order to improve the computing power of the DSP architecture,a dual-core programmable DSP architecture is proposed,implemented and integrated in an energy metering and measurement SoC.In this SoC,the DSP can not only fetch the fixed program stored in the ROM,but also fetch the program stored in the FLASH or SRAM in the SoC through the AHB-lite bus.In addition,this paper proposes a fast detection algorithm based on waveform for detecting the over-current,over-voltage,under-current and under-voltage events.The detection flexibility is adjusted by configuring the comparing threshold,the number of sampling points and the detection period.By utilizing these DSP architectures,the three chips have been commercialized and in production.