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  1. Replies
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    Hi,

    what do you mean with:


    *************

    * timer triggers ADC_conversion
    * ADConversion_finished triggers ADC_ISR
  2. Replies
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    Closed: Re: Issue with relay and snubber

    Hi,

    then exactly show how you connected mains and motor. We donīt see this now.

    Itīs impossble to run more than 40mA via the capacitor... no way for 2.3A.


    Klaus
  3. Replies
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    Closed: Re: Issue with relay and snubber

    Hi,


    Did you try this, or just guess?

    Due to the capacitive impedance the current is limited to 34mA. If the motor and the load is that low power to make the motor move, then the snubber is...
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    Hi,


    When using ADC interrupt, why not immediately process the incoming data? You have plenty of time doing this inbetween two samples.
    For the minimal solution it's just (pseudo code)
    * read...
  5. Closed: Re: Is it necessary to set FPGA and ASIC operating frequency to the same amount?

    Hi,


    It does not necessarily mean that it finds a solution .... it just tries.

    When an ASIC is specified to run at 100MHz, then this is just for a known function. Often an n bit binary...
  6. Closed: Re: Is it necessary to set FPGA and ASIC operating frequency to the same amount?

    Hi,

    You set the frequency according your requirement.
    If you need it to work with 50MHz, then set it to 50MHz
    If you need it to work with 100MHz, then set it to 100MHz.

    If you set it to a...
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    Hi,


    I donīt understand why "non interrupt" solution.

    In my eyes this is a classical application for interrupt based processing.
    I personally like the interrupt solution, because I find it...
  8. Replies
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    Hi,



    A rather curious requirement.
    The measurement may take 10ms ... or 20ms --> a bit more than 3ms tolerance
    The SSR switching time maybe is 10ms or longer --> longer than 3ms
    At 50Hz it...
  9. Replies
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    Hi,

    Fast code:
    What is the most time consuming with "RMS"? Usually the "square root" function.
    Then omit it.

    For example:
    If you want to compare an RMS value with 7 (let's omit the unit...
  10. Closed: Re: Undersampling ADC for RMS conversion possible?

    Hi,

    Yes, undersampling is possible. But avoid fs to be integer division of f_AC.

    Klaus
  11. Closed: Re: A question about Manual Press Fit DIN connector machine

    Hi,

    Iīd ask the connector manufacturer or connector distributor.

    Klaus
  12. Replies
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    Closed: Re: uc384x PWM DC-DC converter not regulating.

    Hi,

    in the datasheet there is a chapter "Design considerations".
    If you donīt keep on them you should not be surprised if it does not work.

    --> your PCB layout is not suitable. It needs a...
  13. Replies
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    Closed: Re: Single and Polyphase Power Management IC

    Hi,

    Sorry, my fault. I also meant ADE7868.

    Still I donīt find the information that itīs not possible to use it in single phase application.


    Klaus
  14. Replies
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    Closed: Re: Single and Polyphase Power Management IC

    Hi,

    Out of curiosity I tried to find out why AD7686 can not be used in single phase mode by going through the datasheet.
    I could not find such informations.

    Where did you find it?

    Klaus
  15. Replies
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    Closed: Re: Single and Polyphase Power Management IC

    Hi,

    1) Did you read the datasheets? Are you sure the 3-phase ones can't be used for single phase?

    2) You surely are free to use 3 x single phase ones and combine the data with software

    Klaus
  16. Replies
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    [SOLVED]Closed: Re: DC-to-DC Converter question

    Hi,

    There are really many DC/DC converters directly outputing +15V and -15V.

    Farnell lists more than 800 devices with dual output +/-15V.

    Klaus
  17. Replies
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    Closed: Re: 2:1 Multiplexer with open drain Outputs IC

    Hi,

    Daisy chaining JTAG devices should need no extra logic. It can simply be done with JTAG protocol.
    You should be able program to program one device only or both as you like.

    You are not the...
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    Closed: Re: 2:1 Multiplexer with open drain Outputs IC

    Hi,


    Why you want tristate? It is an undefined logic level. The receiver may see HIGH or LOW, or oscillation...

    Klaus
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    Closed: Re: Difference circuit not acting as expected

    Hi,

    It seems you work with digital signals. If so, then use ICs designed for digital operation.
    (An OPAMP is designed fir analog signals and thus not the best choice for digital signals. Expect...
  20. Closed: Re: Transformer Phase shift used in isolated zero crossing detectors

    Hi,

    Ideal transformers don't have phase shift between V_in and V_out.

    Real transformers have. It is caused by the stray (series) inductance, the ohmic wire resistance, the load current ....and...
  21. Closed: Re: Fourier analysis of 5 pulse MPWM ( multiple pulse width modulation ) for inverter

    Hi,

    I see your idea:

    There are positive signals causung some overtones...and there is the same signal negative ...and you want it to cancel all the frequencies.

    For sure they include the...
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    Closed: Re: IR2103 or IR2110 which one is better

    Hi,

    "Which one is better?" in most cases are useless questions.

    Useless, because nobody knows what "better" means.
    Better in which regard?
    Color, size, availability, price, package, power...
  23. Replies
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    Closed: Re: 2:1 Multiplexer with open drain Outputs IC

    Hi,


    First you need to give complete informations.
    --> replace the "?" with the logic levels you desire.

    Klaus
  24. Closed: Re: How to find the operating frequency for an ASIC?

    Hi,

    The usual way is to set the timing constraint first, then the compiler should optimize it to match the specifications.

    If you first set to 30MHz ... then there is no reason for a compiler...
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    Closed: Re: sine/cos encoder to digital

    Hi,


    Rather straight forward:
    If cos = 0, then there are just two possible solutions:
    Phi = 90° when sin = positive
    Phi = 270° when sin = negative.

    Klaus
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