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MSP430I2040: Solution for Neutral wire removed or compensated in order to have L-wired only

Walter Macamos
Genius 5345 points
Part Number: MSP430I2040
Other Parts Discussed in Thread: MSP430F6779A, EVM430-F6779, EVM430-I2040S, MSP430I2041, TIDM-TWOPHASEMETER-I2040

Hi TI Team,

TI’s solution will require neutral wire in order to measure voltage, current and power, please advise do you have other solution to allow the neutral wire can be removed or compensated in order to have L-wired only. 

Regards,

Walter

  • 0
    TI__Mastermind 49692 points

    Hi Walter,

    Our EVMs have been designed to work with configurations that have both Line(s) and Neutral connections, and this impacts the power supply operation and other areas of the system. However, I recently supported another EMDC user (see thread below) who wanted to use EMDC and our MSP430F6779A in split-phase (1V, 2C) configuration but without a Neutral. Here, the design would be referenced to the other Line, let's call it Line 2, instead of the Neutral, which is possible and we did some tests with our EVM430-F6779 that showed it could support this configuration when done correctly.

    MSP430F6779A: US Electric Meter 240 VAC connection with no Neutral or ground

    Technically, if you have a three-phase system with perfectly balanced loads, then ideally there's no current flow in the Neutral connection. Thus, you may be able to get away with not connecting the Neutral and only having the three Line connections, but you'd have to test this out. Basically, current needs to flow, so if you remove Neutral, it can definitely make your design much more challenging.

    Are you trying to perform tamper detection or is this a specific configuration like 2S?

    Regards,

    James

  • 0 in reply to James Evans
    Genius 5345 points
    Hi James,

    Are you trying to perform tamper detection or is this a specific configuration like 2S?
    - US market, 2S application.

    Regards,
    Walter
  • 0 in reply to Walter Macamos
    Genius 5345 points
    Hi James,

    Is there a way to be able use MSP430i2040S or with HW modification to be able to use fo US market, 2S application?

    Regards,
    Walter
  • 0 in reply to Walter Macamos
    TI__Mastermind 49692 points
    Hi Walter,

    For the 2S configuration, we typically recommend using at least 3 ADC channels: 1 to measure the voltage between L1 and L2 (ideally this would be 2 measuring between L1 and Neutral and also L2 and Neutral), the other 2 for measuring the Line currents. Although the EVM430-i2040S can't support the complete 2S configuration natively, the MSP430i2041 can support this configuration using different hardware. Take a look at our TIDM-TWOPHASEMETER-I2040 design - unfortunately this board is not available for purchase but the design is a good reference. For details about referencing the L2 instead of Neutral, please refer to the thread linked earlier.

    If you powered the EVM430-i2040S using a battery, you could connect the EVM across L1 and L2 rather than Line and Neutral to test out the voltage measurement.

    Regards,

    James

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