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Thread: Jonny reviews lack the Hold Up Time test.

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    Some time ago there was a review of Intelliplug on the eevblog forums:

    http://www.eevblog.com/forum/reviews...ktop-teardown/

    Pictures are gone as they were hosted on external site. But basically it's a thing that monitors when there's no more current pulled from one socket and when there's little power used it disconnects a second socket at a zero crossing moment using a relay.
    There's a Cirrus Logic CS5466 IC used to detect the zero crossing : http://www.cirrus.com/en/pubs/proDat.../CS5466_F2.pdf

    They basically detect a zero crossing moment from the ic, then wait for one cycle minus the time they determined it takes for the relay to deactivate, so the thing turns off pretty much at close to 0 vAC

    Perhaps the approach can me used to disconnect a power supply at 0 vAC on mains, which I guess should be the hardest for a power supply.

    // I think the plug is this one, but i'm not sure: http://www.homeenergysaving.co.uk/intelliPlug.html

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    Yeah. Huntkey makes.. or made.. a power strip that does that. Hmm... Where's my Huntkey contact card.

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    Problem there is the relay doesn't provide a fast or repeatable disconnect. We're talking 5-10ms +/-0.5-1ms. Considering that one AC cycle is 1.66ms, I don't see how they can reliably hit the zero crossing. That's why my schematic switched to a mosfet; I should be able to get response in the 10s of microseconds fairly easily, low hundreds at most, with far less variation.

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    Actually, it's 16.667 ms, but the issue remains...
    Careful what you wish for... You just might get it.

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  6. The Following User Says Thank You to crmaris For This Useful Post:

    Jon Gerow (04-04-2014)

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    Hard to tell from the video, what stage are you at now?

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    finished but it is too draft for my taste. The circuit measures the AC frequency in real time and cuts at exactly 0 or where ever I want it to cut. Through software I also take into account the response time of the relay. However I will order a bigger/stronger arduino (although it is not needed but the one in the video isn't mine but a friend gave it to me) and will do some tests with solid state relays, too. The thing is that currently I am drawn by reviews and don't have any free time to play with this

    I can make an all-in-one solution that will automatically extract the minimum hold-up time after a series of tests (trying different AC phase angles). The user will just have to fire the "go" button from his desktop (or on the arduino), but as I said right now I don't have the time needed to implement it.


    ps. Bite the bullet and ordered some serious arduino stuff today. Now I have to find time to play with it
    Last edited by crmaris; 04-08-2014 at 07:26 AM.

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    How about 'cheat' for an estimate

    Figure out the energy in the primary capacitors (C V^2/2), then calculate how long this could hold up the maximum power (till say half the energy was gone)

    That would give a ball park figure of what the unit might be capable of

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    That only works if you are talking about to identical designs. Some designs can have a much longer hold-up time with smaller caps.

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    what an old thread but still interesting...

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