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Three Phase AC Voltage and Current Transducer with Isolated DC Analog Outputs Reference Design

Texas Instruments

This reference design uses the MSP430F67791A device to accurately measure voltage and current. It also demonstrates using two DC-analog output channels which are capable of being individually configured for voltage output (±10 V) or current output (±24 mA). The advantages of this design is that it measures voltage and current and provides a DC-analog output proportional to the AC inputs. Another advantage is the bidirectional DC-analog output.The design has six digital outputs that can be used to drive relays. The functionality of the design can be extended to measure power.

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Features

MSP430F67791A System-on-Chip (SOC) with six simultaneous delta-sigma ADCs for three current and voltage measurementDual-output 16-bit DAC8563: XTR300 and ISO7341FC based. Programmable DC-voltage or current output; ±10-V DC or ±24 mA; unidirectional or bidirectionalDigital outputs consist of six open collector outputs for driving relays: pulse and provided as open collectorVoltage measurement range: 10% to 120% of rated voltage (230 V)Current measurement range: 5% to 200% of rated current (5 A)On-board current transformer and potential divider provided for direct measurement of voltage and current