ST STPM34精度0.2%双相电表解决方案

ST公司的STPM3x系列产品是采用Rogowski线圈,电流变压器或并联电流传感器的高精度电力和能源测量芯片,集成了模拟和数字两部分:模拟部分包括两个可编增益低噪音低失调放大器和多达4个2阶Sigma-Delta ADC,两个带单独温度补偿的能带隙基准电压,一个低压降稳压器和DC缓冲器;数字部分包括数字滤波,DSP,输入DFE和UART或SPI串口.器件满足交流电表的ANSI12.2x标准.本文介绍了STPM34主要特性,框图,典型应用电路,以及EVALSTPM34双相电表评估板主要特性,电路图和材料清单.
The STPM3x is an ASSP family designed for high accuracy measurement of power and energies in power line systems using the Rogowski coil, current transformer or shunt current sensors. The STPM3x provides instantaneous voltage and current waveforms and calculates RMS values of voltage and currents, active, reactive and apparent power and energies. The STPM3x is a mixed signal IC family consisting of an analog and a digital section. The analog section consists of up to two programmable gain low-noise low-offset amplifiers and up to four 2nd order 24-bit sigmadelta ADCs, two bandgap voltage references with independent temperature compensation, a low drop voltage regulator and DC buffers. The digital section consists of digital filtering stage, a hardwired DSP, DFE to the input and a serial communication interface (UART or SPI). The STPM3x is fully configurable and allows a fast digital system calibration in a single point over the entire current dynamic range.
STPM34主要特性:
• Active power accuracy:
– <0.1% error over 5000: 1 dynamic range
– <0.5% error over 10000: 1 dynamic range
• Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x,ANSI12.2x standard requirements for AC watt meters
• Reactive power accuracy:
– <0.1% error over 2000:1 dynamic range
• Dual mode apparent energy calculation
• Instantaneous and averaged power
• RMS and instantaneous voltage and current
• Under and overvoltage detection (sag and swell) and monitoring
• Overcurrent detection and mo...