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Thread: USB powered LED & AC Adapter accepting USB input

  1. #11
    Join Date
    Jun 2017
    Location
    Canton, Michigan, USA
    Posts
    33

    Testing

    Quote Originally Posted by gar View Post
    170707-1059 EDT

    RomanyCaravan:

    I have never encountered the companies, and thus, no experience.

    If you plan to sell thousands of these units, then I would suggest you do some testing. You can only test a small sample, but it may tell you something.

    For the power supply:

    Apply minimum AC supply voltage (use a Variac for the supply), then with a variable load obtain data to plot output voltage vs load current from 0 to 150% of rated load current.

    Using a setup transformer from the Variac do the same test at the specified maximum input voltage.

    Report back on this data.



    For your LEDs measure current vs voltage for 4 V thru 7 V.

    Again report back.

    These simple tests may tell us what other tests to run.

    .
    Gar:
    Thank you. Will preform he tests and report back.

    Thank you!

    Mark

  2. #12
    Join Date
    Jun 2017
    Location
    Canton, Michigan, USA
    Posts
    33
    Quote Originally Posted by gar View Post
    170707-1059 EDT

    RomanyCaravan:

    I have never encountered the companies, and thus, no experience.

    If you plan to sell thousands of these units, then I would suggest you do some testing. You can only test a small sample, but it may tell you something.

    For the power supply:

    Apply minimum AC supply voltage (use a Variac for the supply), then with a variable load obtain data to plot output voltage vs load current from 0 to 150% of rated load current.

    Using a setup transformer from the Variac do the same test at the specified maximum input voltage.

    Report back on this data.







    For your LEDs measure current vs voltage for 4 V thru 7 V.

    Again report back.

    These simple tests may tell us what other tests to run.

    .
    Gar:
    Can I get by with using the attached variac?

    https://www.circuitspecialists.com/v...R0ZhoCHNDw_wcB


    Best,
    Mark

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