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AMC1350: AMC1350

MAHESH ULISI
Prodigy 50 points
Part Number: AMC1350
Other Parts Discussed in Thread: AMC1351, AMC3330

Hello TI Team,

I am currently in the process of designing an AC/DC voltage sensor utilizing the AMC1350 isolation amplifier and would greatly appreciate your expertise in verifying the schematic and associated values.

1)One aspect that has given rise to uncertainty pertains to the output low pass filter. Specifically, I am seeking guidance on how to appropriately select a low pass filter that accommodates a switching frequency range of 15-25kHz, while also addressing the 50/60Hz fundamental frequency of the system.

2)The schematic provided illustrates that the sensor is designed to measure phase to neutral voltage. However, should the need arise to sense phase to phase voltage, I am keen to understand how the schematic might require modification to accommodate this requirement. If I add separate isolated power supply for each phase sensor could that help.

3)Can I use AMC1350 isolation amplifier for Battery voltage sensing or should I use AMC1351, which any way it is unidirectional. But I'm having concern if I want sense reverse voltage. How could I sense it?

Given the criticality of this application within the industrial UPS sector, ensuring the accuracy and reliability of the voltage sensor design is paramount.

 

  • 0
    TI__Expert 8455 points

    Hi Mahesh,

    1. What frequency is your input signal at? If its larger than 50Hz, I would recommend mitigating the fundamental frequency in post processing. 

    2. This tech note may be helpful:

    3. Yes, you can use the AMC1350 for battery voltage sensing. You just may lose some of the full scale range depending on your input range. 

    Best regards,
    Eva

  • 0 in reply to Eva Mason
    Prodigy 50 points

    Hi Eva,

    1.Grid frequency is 50/60Hz sinewave. How to locate the low pass filter corner frequency, which is ADC for microcontroller? 

    2.Thanks for Split type connection document. Can I use AMC3330 for AC (480Vac, L-L) & DC (750Vdc) voltage sensing. Previously I considered AMC1350 along with Isolated power supply (DCH10505S), Which is costly solution. For AC voltage I need to measure Phase to neutral and Phase to phase for 3 Phase with 3Nos AMC3330 IC.

    3.Thanks understood.

    4.Please suggest Shunt based current measurement with AMC3330 IC. Application Current rating is 150Arms and 172Adc.

  • 0 in reply to MAHESH ULISI
    TI__Expert 8455 points

    Hi Mahesh.

    1. What are you are trying to achieve? What specific frequencies are you trying to measure and are they all below 50Hz? This article may be helpful:

    2. The AMC3330 is ideal for AC line-to-line voltage sensing but could be used for DC voltage sensing too. The AMC1350 is also intended for AC voltage sensing but can be used for DC voltage as well. 

    4. Are you using the AMC3330 for voltage sensing or current sensing? Question 2 sounded like you are using this for voltage sensing - which we recommend given the device's high input impedance and larger input voltage range. If you were to try current sensing, the equation to calculate your sense resistor would be:

    • R_sns = V_fsr / I_cross 

    Best regards,

    Eva