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Sub-system reference design delivers 3-phase power monitoring

30 Apr 2014  | Graham Prophet

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Maxim has unveiled its "Petaluma"(MAXREFDES30#) 8channel sub-system reference design, an analogue measurement solution for three-phase power monitoring applications, which include hardware, firmware, design files, and lab measurements.

Three-phase power measurement applications require multiple analogue inputs for voltage and current measurements on each line of the three-phase system. A power monitoring system must sample all of the analogue inputs simultaneously to accurately calculate the instantaneous power consumption.

The Petaluma sub-system reference design provides eight high-speed, 250ksamples/sec, 16bit simultaneous-sampling analogue input channels that accept ±10V input signals.

The Petaluma design uses two quadruple input buffers (MAX44252); an 8channel, 16bit simultaneous-sampling ADC (MAX11046B); a 4.096V voltage reference (MAX6126); and regulated +10V, -10V, and +5V power rails (MAX1659, MAX765/LM337, MAX8881). In addition, this sub-system also performs well in any application that requires multiple simultaneous sampling of analogue inputs, such as multi-phase motor control and industrial vibration sensing.

The MAX44252 devices (U1 and U2) are quadruple ultra-precision, low-noise op amps. The op amps attenuate and buffer the ±10V input signals to match the input range of the ADC (MAX11046). The MAX44252 devices are set up in the inverting configuration, so the polarity of the signal is reversed at the input of the ADC. The MAX11046 (U3) is an 8channel, 250ksamples/sec, 16bit, single-supply, bipolar, simultaneous-sampling ADC.

Although the MAX11046 ADC has an internal 4.096V voltage reference, Petaluma uses an external MAX6126 (U4) voltage reference to provide the highest possible accuracy. The MAX6126 has an initial accuracy of 0.02 per cent and a 3ppm/°C maximum temperature coefficient. Petaluma connects to FMC-compatible FPGA/microcontroller development boards.

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