ST STPM32高精度单相电表解决方案

ST公司的STPM32是采用Rogowski线圈,电流变压器或并联电流传感器在线测量电能的高精度集成电路,包括模拟和数字两部分.模拟部分包括两个可编低噪音低失调增益放大器,四个两阶24位sigmadelta ADC,两个带单独温度补偿的能带隙电压基准,低压降稳压器和DC缓冲器;数字部分包括数字滤波器,硬连接的DSP,连接输出的DFE和串行通信接口(UART/SPI).本文介绍了STPM32主要特性和框图,DSP框图, EVALSTPM32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.
STPM32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 monitoring
• UART and SPI ...