Transformerless Power Suppply


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  1. #1
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    Hi,

    What I have in my house.

    (Click to enlarge).

    Best regards,

    Luciano
    Attached Images Attached Images  

  2. #2
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    Talking An English man's house ...

    Hi, Luciano

    Seems not only for the Englishmen ...

    3 Phases ... Your home really is a Castle !!!

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  3. #3
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    Hi Alain,

    This is what we get here.
    Only this option is available.

    Our milking machines use three-phase motors.

    Best regards,

    Luciano

    PS: En réalité j'habite dans un petit village au
    sud des Alpes. Avec nos amis et voisins italien
    on partage la langue et la culture. Ciao!

  4. #4
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    Default Neutral And Ground

    The big difference between ground and "common" or "neutral" is the voltage drop that is developed on the neutral wire due to the fact that it has the same current flow as the line conductor (What goes out must return) (Load current x DC resistance of neutral conductor between receptacle and breaker box= Voltage difference between neutral and ground at the receptacle). Normally the voltage drop is neglible except in long circuit runs with higher current loads. The neutral and ground wires are normally connected together (bonded) at the breaker box. I totally agree that the fuse definitely needs to be in the "hot" or "line" or "mains" line to perform a safety function.

  5. #5
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    Hi all
    All said and done, we have to accept that what we try to design and implement will be used by us only and that there would not a future occassion to extend the equipment using such PSU to other eqpt, which might create ground loops- a possible shock.

    many times we will be pre occupied and would like forget the non isolated psu and take it for granted that we will be safe--

    AS SUCH I SUUGEST THAT WE SOULD NOT PRACTICE THIS MODE AT ALL-- ok for academic interest.
    Regards,
    Sarma

  6. #6


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    Lightbulb

    Strangely, i have a design for a transformer-less PSU in the making...
    My reason for not using a transformer is because to have a transformer that drops 110V and 240V down to a more usable voltage and supply the current i need would be massive and it costs >£50 each...

    I'm not going to post details of the PSU because i intend on filing for international copyright.
    The reason for this is because it will handle any single phase voltage, frequency and amount of noise (or noise only) you can throw at it.
    It will even operate in a brown out with sustained unstable voltages as low as 24V (maybe lower).
    It can also handle stepped AC, Square wave and saw tooth signals provided it is alternating...

    Also, Mel is absolutely right, that AN is written for one purpose and one purpose only... TO KILL PEOPLE!

  7. #7
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    Something like this PSAA60W-120

    AC Input Voltage Rating: 100 to 240V AC
    AC Input Frequency: 50 to 60Hz
    Input Current: 1.6A at 100V AC, 0.7A at 240V AC
    Output: 60W
    Efficiency: 85% average

  8. #8


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    Default Re: Transformerless Power Suppply

    transformer-less... the above has a transformer, i can tell because of the input specification.

    Here in the UK the current code for mains wiring dictates the use of an ELCB.
    Earth Leakage Circuit Breaker. If more than 50mA flows up or down the earth wire the ELCB will trip isolating both live and neutral.
    every time I've diagnosed wiring faults, their has always been a 50 to 60 V AC difference between earth and ether neutral or live...
    If you use an isolation transformer you can connect the negative after rectification to ground. This is what most PC PSU's do.

    edit:
    That efficiency rating is crap!

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