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Thread: Energy Efficiency Standard Effective This Week in the US (Power Bricks)

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    Default Energy Efficiency Standard Effective This Week in the US (Power Bricks)


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    It won't matter much until they can slap a catchy label on it. There are far too many cheap 1.5A & 2A 5V/USB brickts out in the market for any new ones to even make a dent at the moment.

    If I'm reading the article right, it will mean that included power bricks with Smartphones will have to be more efficient. That won't effect high end devices much, but for low end phones it should be nice.

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    Eh, still the most efficient way is to unplug them when you don't need 'em. Higher efficiency is nice for charging I guess, but it still won't match up to being plugged in for days without purpose.

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    I opened a very cheap usb charger that a friend bought. It was getting very hot and I wanted to see what was inside...

    Guess what was inside.

    Literally a tiny transformer to drop 120v to 12, a rectifier and a capacitor. Since usb requres 5v, guess how it was being regulated?

    A 7805.

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    Quote Originally Posted by ridgid13579 View Post
    I opened a very cheap usb charger that a friend bought. It was getting very hot and I wanted to see what was inside...

    Guess what was inside.

    Literally a tiny transformer to drop 120v to 12, a rectifier and a capacitor. Since usb requres 5v, guess how it was being regulated?

    A 7805.
    Well it's a tried system. Fluke chargers uses the same btw, but sans the regulator.

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    The 7805 can be surprisingly good if paired with an appropriate output capacitor.

    Honestly, proper SMPS chargers, done in the same fashion a 5VSB rail typically is in affordable PC PSUs (flyback + schottky with PWM regulation) are quite rare. A 7805 is actually decent.
    Careful what you wish for... You just might get it.

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