High Accuracy Split-Phase CT Fuel Gauge Reference Design Using Independent ADCs

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High Accuracy Split-Phase CT Fuel Gauge Reference Design Using Independent ADCs [Copy link]

The reference design implements Class 0.1 split-phase energy metering using high-performance, multi-channel analog-to-digital converters (ADCs). Independent ADCs sample the output of current transformers (CTs) at 8kHz to measure the current and voltage in each branch of the main AC source. The reference design achieves high accuracy over a wide input current range (0.05–100 amps) and supports high sampling frequencies when necessary to enable advanced power quality features such as independent harmonic analysis. Using independent ADCs to sample the CT outputs gives designers more flexibility in selecting a metering microcontroller compared to integrated SoCs and application-specific dedicated products. This reference design uses a SimpleLink ARM Cortex-M4 host microcontroller to calculate energy metering parameters.

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2019-10-22 20:24 上传

• Power metering with phase measurement, meeting ANSI C12.20 Class 0.1 active energy accuracy requirements with 10000:1 input range
• Active and reactive energy and power, root mean square (RMS) current and voltage, power factor, and line frequency calculations
• Isolated RS-232 and RS-485 with 5kV RMS Isolation
• Communication module expansion with current limiting and overvoltage and undervoltage protection
• Tested over 50mA to 100A input range
• Complete and tested reference design with hardware files and design guide

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Design Guide

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High Accuracy Split-Phase CT Fuel Gauge Reference. Design using Independent ADC