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Voltage detection

WS Lee
Intellectual 1935 points

Hi Team,

My customer looks for the solution, IC or application circuit for the following request.

They’d like to detect the voltage difference of each input voltage line. And if the voltage difference is over 3V, they wants to get “High” signal and if it is under 3V, they

wants “Low” signal.

I think that there is no IC to meet this specific requirement, so if we have any idea to make the circuit, could you please recommend the reference circuit?

Please refer to the attached.

Thanks,

WS

Voltage detection.pptx

  • 0
    TI__Genius 16030 points
    Hi WS,

    This is a good question. Let me discuss with my colleagues, and I will let you know if we have a device, or have an idea for a circuit to accomplish this.

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    TI__Genius 16030 points

    Hi WS,

    It depends on what exactly the voltage ranges are for the supply, but you could use a difference amplifier to get a V1-V2 voltage, and then input that voltage to a comparator with 3V reference.

    This LMV358 block diagram shows a difference amplifier, when R1=R2=R3=R4, you get Vout=V2-V1.  Then take that Vout and compare it to a 3V reference using a comparator.  You could use a dual op amp IC to function as both the amplifier and comparator.  If you have another supply (eg. 5V), you might also be able to divide down that to 3V to use it as the reference for the comparator input.

    Regards,
    Karl