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Thread: notebooks need current mode pwm acdc adapter?

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    Default notebooks need current mode pwm acdc adapter?

    or this is not a rule?(v mode ok as well)

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    Need not to care. Either way, the adapter is designed to be a voltage source, not a current source.
    It's been a hard day's night and I've been working like a dog.

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    What Travis said.

    As long as the voltage is correct and it has the correct tip with the correct polarity and it can supply enough wattage, it's good to go.

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    ...and it can supply enough wattage
    That's really the key part, IMO. Yes, the voltage has to be correct but it still has to supply enough current too. With the understanding that P(power in watts) = I(current) x E(electromotive force or voltage), you may be able to recharge the battery with a low current "trickle charge" - though it may take forever to fully charge. But to actually run the computer, the supply has to supply enough current to meet the power (wattage) demands of the computer. In fact, the supply, with it's constant voltage output, must be able to deliver enough current to charge the battery AND run the computer at the same time. So in that sense, the supply is a current source too.

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    Quote Originally Posted by Digerati View Post
    So in that sense, the supply is a current source too.
    Obviously any source of electrical energy must provide both voltage and current. Calling something a voltage source refers to the fact that the voltage is controlled, not just that it exists.
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    Obviously any source of electrical energy must provide both voltage and current. Calling something a voltage source refers to the fact that the voltage is controlled, not just that it exists.
    Best I can make it out I think it was supposed to be a debate on whether something needed to be a constant voltage power supply or a constant current regulated power supply(?)

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    Current drawn depends on the load a notebook presents, you can't control it directly, ie. tell a notebook to draw 5A or whatever other value.

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    Quote Originally Posted by rafal_iB_PL View Post
    Current drawn depends on the load a notebook presents, you can't control it directly, ie. tell a notebook to draw 5A or whatever other value.
    c.m. control is when the output inductor current is regulated, in addition to having output voltage feedback(this probably prevents serialising 2 ps outputs as when both are v.mode)

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    There are all sorts of controls. You want a fixed voltage but as noted current needs to change with demands - or else that would be pretty darn inefficient. But at the same time, you don't want any overcurrent situations as that will mean something will get too hot - never good.

    Sadly, there is no ATX type standard for notebook power supplies. They come in all different sizes, voltages and current capabilities. Some are more intelligent than others for better output control. Some rely solely on the notebook's regulation and charging circuits for regulation and control. It's all up to the notebook maker.

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    never ever buy the $4.99 ebay laptop chargers. always buy genuine branded units!!! needless to say, i have seen many 2-week-old dell imitation chargers with bloated caps!

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