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AMC1200 reference design ：neither shunt nor transformer solution .

takao miyazaki
Intellectual 340 points
Other Parts Discussed in Thread: AMC1200, AMC1100

Dear sir

 

Engineer of Our customer would like to have reference design of AMC1200 For 100V AC Inverter.

Is there any good  isolated  solution of  measuring 100V AC  directry without tranceformer ?

Also customer don't want to  shunt resistere based solutions(current sensing ) .

I already introduce them (AMC1100: Replacement of Input Main Sensing
Transformer in Inverters with Isolated Amplifier )  http://www.ti.com/lit/an/slaa552/slaa552.pdf .

Please reply for good  new design oppotunity . 

Best regards miyazaki

  • 0
    TI__Genius 9975 points

    Dear Miyazaki-san,

    I would like to clarify one point: if I understood you question correctly, your customer is looking for an integrated circuit that provides some level of galvanic isolation when directly measuring a 100 V AC signal. Assuming a purely sinusoidal AC signal, the integrated circuit would need to have an input voltage range of at least +/- 142 V. I assume the isolated output signal of such integrated circuit needs to be proportional to the input AC signal and between 0 V and 5 V. Did I understand your question correctly?

    With this information in mind, the integrated circuit would need to attenuate the input 100 V AC signal by a factor of  0.017 V/V (such that the 284 Vpp input is translated to a 5 Vpp signal).

    Moreover, your post indicates “Also customer don't want to  shunt resistere based solutions”, I assume this means the customer desires a single integrated circuit solution and not a solution consisting of resistors plus integrated circuit. Is my understanding of your forum post correct?

    Assuming the information above is correct: we do not have a device capable of providing the required input voltage range, or attenuation. Our solutions would be based on a combination of resistor dividers and isolation amplifier.

    Could you please elaborate on your customer’s request for a solution that does not uses resistors? Do you know what their specific concern about using resistors is? Maybe we can ease their concern.

    Also, do you know what is the target accuracy for this solution?

    Best regards,

    Jose

  • 0 in reply to Jose Duenas
    Intellectual 340 points

    Dear Jose -san

     

    Thank you very much for your quick reply and really sorry for late post again.

    As your assuming mention  is fit customjer's  inqilry , (that the 284 Vpp input is translated to a 5 Vpp signal). 

    And customer not mesuring current(not using series shunt ) but voltage (combination of resistor dividers

    and isolation amplifier is acceptable).  

    And Now the customer would like to derive their target measuring voltage accuracy.

    They need  some  information e.g.reference guide for their design plan .  

    I will give you a target value when we get it.  Sorry for bothering  and  confusing .

     

    Miyazaki 

     

  • 0 in reply to takao miyazaki
    TI__Genius 9975 points

    Dear Miyazaki-san,

    The guidelines provided in the application note you mentioned earlier (AMC1100: Replacement of Input Main Sensing Transformer in Inverters with Isolated Amplifier http://www.ti.com/lit/an/slaa552/slaa552.pdf ) should be able to address the needs of the customer (given that the customer can use a combination of resistors and isolation amplifier).

    Please forward us any specific questions the customer has regarding the application note.

    Best regards,

    Jose