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Type: Posts; User: smijesh

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  1. Replies
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    323

    Closed: Re: Power supply to controller

    It is not safe for a service persons, Difficult to get UL approval. Use restrictive divider to reduce the voltage to 5V/10 instead of 230AC then connect to PIC

    it means neutral from AC supply...
  2. Closed: Re: how to eliminate oscilation in current measuring circuit ?

    Oscillation may happen due to poor winding coupling of CT or due to connections in bread board or long cable in the high frequency switching path.

    Try with a standard CT and PCB
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    Closed: Re: Dual Power supply from AC input

    If you getting 9V from a transformer why cant you use below topology with a center taped transformer
    154028
  4. Closed: Re: can secondary inductance be determined from provided data

    Available data is enough to calculate secondary inductance

    Primary inductance: 2.8mH
    Turns ratio: 85:1
    Consider Primary 1 turns and Secondary 85 turns
    AL Value : 2.8mH/1^2=2.8mH
    Secondary...
  5. Closed: Re: Highest practical power of LED driver off 240VAC?

    Normally LED drivers are boots or fly-back topology, for offline application (240VAC) the switching current will be very high(Five times the required current). it is not worth to use very high...
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    793

    [SOLVED]Closed: Re: Solder dots on PCB traces

    We can’t predict but possibilities for multilayer PCB with buried vias or If it is a single layer PCB solder mask opened for test pints or wire connection
  7. Closed: Re: [moved] Power generator on Boeing passenger planes?

    In aircraft, power generating through anteaters, output is 115V AC three phase at 400Hz to 800Hz. Then auto transformer rectifier unit will convert this power to 270VDC bus distributed over the...
  8. Closed: Re: I can't find a PCB package for a transformer in Proteus 8 ?

    Go through below link
    https://www.theengineeringprojects.com/2018/04/how-to-add-new-library-in-proteus-8.html
  9. Closed: Re: Simplest way of converting 240Vrms mains into 450VDC?

    Hope you need to convert 240V @ 50Hz to 450VDC @133mA (60W/450)
    Here the output voltage is almost double to the input voltage, so I am suggesting isolated DC DC converter
    Try this IC ...
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    Closed: Re: Burden Resistor of calculation

    How Burden VA is calculated??
    ANS:
    Burden means resistor connected to output of CT,
    VA calculation, when burden resistor connected to output of CT, voltage will appear across the resistor and...
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    [SOLVED]Closed: Re: slowest ferrite material

    Ferrites have an advantage over other types of magnetic materials due to their high electrical resistivity and low eddy current losses over a wide frequency range, So ferrite materials highly used in...
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    [SOLVED]Closed: Re: slowest ferrite material

    Your quary is not clear

    Ferrite materials are not substitute for silicon steel most of the application.
    Ferrite materials having less flux density 0.4T steel having 2T so you have to increase...
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    Closed: Re: PCB four 80 mill wide traces

    Simple Suppose your cu track have 0.1m Ohm resistance, your solder mask (bead ) have 1 m ohm then effective resistance will be 0.09 m ohm
    We can increase the thickness of solder mask so the...
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    Closed: Re: Patents in the European union...

    Any person / company can apply for patent in any countries. by applying international patent

    https://www.epo.org/index.html
  15. Replies
    2
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    326

    Closed: Re: Tinyswitch4 under voltage lockout

    Treez

    Please note this point from data sheet,

    As per schematic 270V AC applied and total 4 M Ohm resistor connected. So current to the pins(UV) will be 67uA (270/4M)

    Suppose voltage reduce...
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    [SOLVED]Closed: Re: Transformer core flux

    Between the two coils is defined as the property of the coil due to which it opposes the change of current in the other coil, or you can say in the neighboring coil. When the current in the...
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    4
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    523

    [SOLVED]Closed: Re: Transformer core flux

    Current in the coil will generate flux through air or any medium, if you place a core, it is high permeabile so flux travel only in core.

    Change in the current (AC) in the coil produce change in...
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    Closed: Re: IR2130 shut down function

    IR2130 do not have soft turn off function better to try
    ...
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    Closed: Re: circuit to mesure ac voltage

    Coupling capacitor or transformer required for mixing AC signal + DC

    for example150812
  20. Closed: Re: How create negative voltage -700mV - -1000mV 30mA?

    You can use restive divider for voltage splinting + & - voltage for small current application 150708
  21. Closed: Re: 1kW Push-Pull Converter Controller IC Recommendation

    I maid 1KW pushpull converter with SG3525 as a voltage controller since 2003. No problems found other than less efficiency 95%
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    Closed: Re: Design of current to voltage levels

    Hi Karthik,
    You can convert this current to voltage and use a voltage comparator

    Set reference voltage of comparator 2V (it means 40uA source connect to ground through 50K resistor 40uA x 50K =...
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    [SOLVED]Closed: Re: high voltage without winding a coil

    You have to consider potential difference in between two adjacent conductor, the separation between two conductor is also one of the main contributor for corona, Corona is a phenomena just before...
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    [SOLVED]Closed: Re: high voltage without winding a coil

    I will give one more solution.
    Insert iron bar or stacked lamination(I Core) in to the centre hole of the spool, it will increase the impedance and you can increase applied voltage

    Or place the...
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    [SOLVED]Closed: Re: high voltage without winding a coil

    Corona proportional to applied voltage and atmospheric pressure.
    For obtain corona you can increase the applied voltage on the spool or decrees the pressure
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