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Type: Posts; User: KlausST

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  1. Replies
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    Closed: Re: Li-ion Battery charger need help

    Hi,

    What exactly does the datasheet say? 1C is typical or recommended charge current, or maximum charge current?
    (Why don't you post a link to the datasheet?)

    Doesn't the manufacturer provide...
  2. Closed: Re: How can I tell if my laptop screen is LED or LCD?

    Hi,

    There are laptops with OLED display.

    Thus I recommend to look into the operating manual of the laptop or consult the manufacturer's internet pages.

    Klaus
  3. Closed: Re: li-ion voltage reducer to 3volt - help needed

    Hi,

    There are linear LDOs.
    And there are switch mode step down converters, also called buck converters.

    All have their benefits and drawbacks.

    But to decide which one to choose, you need to...
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    Closed: Re: IGBT Overshoot and Weird Slope

    Hi,

    There are electronic devices called capacitors.
    Do you know them?

    Klaus

    Added:
    Your schematic violates general rules how to use gate drivers as well as IGBTs.
    The same applies for the...
  5. Replies
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    Closed: Re: Protecting SMPS against mains transients.

    Hi,

    Basically every overvoltage protection includes:
    * a serially connected device to limit the current (even wiring)
    * a parallel connected device to limit the voltage
    For sensitive devices...
  6. Closed: Re: Is it possible to make an IGBT to work at duty cycles up to 100%?

    Hi,

    I wonder why you still ask the same vague question.
    It is already answered that there is no problem in continously operating an IGBT. There is nothing special to take care of.
    All...
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    Closed: Re: Bldc Motor controller Mosfet Circuit

    Hi,
    I can not remember to have seen this circuits before...and I've seen a couple BLDC circuits.

    Then show us.
    If it's in "all" ... then I expect it to be in the application notes, too...and I...
  8. Closed: Re: PCB layout design consideration for BLDC controller

    Hi,

    Every Mosfet manufacturer and every gate driver IC manufacturer provides application notes and design notes. They are free. Use them.

    Klaus
  9. Replies
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    Closed: Re: I2C not working properly

    Hi,

    Maybe a dumb question:
    When your I2C slave has no internal clock, then how can it generate 300ns (or more) delays?

    I2C_START condition: SDA_falling @ SCL_HIGH
    I2C_STOP condition:...
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    Closed: Re: I2C not working properly

    Hi,

    Whan I see your diagrams ... one thing is worrying me: the edges of the data sometimes are very close to the edges if the clock.
    They should not be that close.
    Are you sure they are...
  11. Closed: Re: Is it possible to make an IGBT to work at duty cycles up to 100%?

    Hi,


    I'm not surprised.
    100% duty cycle is nothing special, no stressing situation.
    It's rather the most "non stressing" situation for an IGBT....except "continously OFF".

    For this situation...
  12. Closed: Re: Is it possible to make an IGBT to work at duty cycles up to 100%?

    Hi,

    I wonder why you use that expensive driver circuit.
    It is designed for
    * high side switching
    * high speed switching
    * power supply
    * and a lot of other features that you don't need (at...
  13. Closed: Re: Is it possible to make an IGBT to work at duty cycles up to 100%?

    Hi,

    Every IGBT can work with 100% duty cycle.
    It's not a problem of the IGBT, it's a problem of the gate driver circuit.
    And only high side and only if a bootstrap supply circuit i)s used.

    As...
  14. Closed: Re: Flyback SMPS power MOSFET getting hot? uc3843 pwm converter

    Hi,


    It's not clear where your arrows point to..
    The "air gap" is between the two halves of the ferrite core. (With air gap, the two ferrite pieces don't touch each other).
    (It's not the gap...
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    Closed: Re: Driving 140x 3W LEDs

    Hi,

    I see a lot of misunderstandings.

    In the order of your post#37:

    The aim of the constant current is not to provide a precision constant current. The aim is to limit the current to a safe...
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    Closed: Re: layout design of an adapter using Altium

    Hi,

    My tablet can't open your attached file.

    Klaus
  17. Closed: Re: Testing LI Batteries with the help of a device

    Hi,

    You say you want test for "reliability". How do you test and evaluate reliability of LiPo cells?

    Why not buy a couple of these devices?

    Klaus
  18. Replies
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    Closed: Re: H bridge with IR2110

    Hi,

    I don't understand what is shown on the scope and what signals these are on the schematic..

    But one thing I can say:
    Your analog circuit makes no sense.
    Buffering a signal .... then...
  19. Closed: Re: Implementation of a MUX for selecting from 2 different sets of inputs

    Hi,

    I agree with ads-ee.
    I really don't have a clue what you are talking about.

    Draw a sketch of what you want to build and give precise informations and specifications (usually with values...
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    Closed: Re: current excitation for sensor

    Hi,

    Maybe you mix accuracy with precision?

    You can't get 0.025% accuracy with all what you wrote before.
    Even 0.025% precision is hardly possible.

    And can you please explain how you want to...
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    Closed: Re: MP1584 5v regulator voltage drop problem

    Hi,

    Please try to give useful informations.
    * I can't find information about voltage drop in post#1.
    * Now we know that you are concerned about voltage drop. But we don't know how much (maybe I...
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    Closed: Re: current excitation for sensor

    Hi,

    What exactly (of the explanation) you need to be clarified?

    A voltage reference will not start at random voltages (why sould it in your eyes).
    But it will
    * drift with time
    * drift with...
  23. Replies
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    Closed: Re: What Signal is this?

    Hi,

    Why not looking for the answer on your own?

    Like this: https://lmgtfy.com/?q=square+wave+through+high+pass+picture
    Go throught the results, see the pictures, read through the explanations....
  24. Closed: Re: Flyback SMPS power MOSFET getting hot? uc3843 pwm converter

    Hi,


    Then just tell what you expect.

    As already said: a DVM (in DC mode) measures "average". Obviously the output voltage is less than VCC and of variable duty cycle.

    Klaus
  25. Replies
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    Closed: Re: Shunt in DC ammeter circuit

    Hi,

    From the explanation it seems you connected the load on the terminals of the voltmeter....and not directly to the shunt.
    This is not the same since the wires between shunt and voltmeter have...
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