Current bypass

Discussion in 'The Projects Forum' started by saurabhkarnik, Jul 28, 2008.

  1. saurabhkarnik

    Thread Starter Member

    Jun 22, 2008
    22
    0
    well i'm working wid a 220v 5 amp ac supply system
    i've resistance connected in series wid the suppl which will burn out when the full current flows...
    i want to bypass the resistor when high current flows... can u please suggest or gimme link for the x'sistor to be used or gimme diff power x'sistors which have the following parameters..
    thanks a lot
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    Why have you got a resistance in series with the supply?

    A cheap way to contol things until you have the correct circuit sorted is to use electric light bulbs, of comaparable wattage to your need.
     
  3. saurabhkarnik

    Thread Starter Member

    Jun 22, 2008
    22
    0
    the reason for the resistance in series in unavoidable...
    i'm sampling the current phase by taking the voltage across the resistance.
    thus phase diff can be detected when i connect an inductive load...
    i'm using this sys in power factor correction sys..
    so to detect the overall phase diff there is no option but to connect the resistance in series
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    Well 220 volts divided by 5 amps 44 ohms load.

    A 0.1 ohm resistor will produce 0.1 times 5 or 0.5 volts of signal. Is that not enough.

    This would need a resistor greater than 5 times 5 times 0.1 or 2.5 watts capacity. A 5 watt resistor should do the trick.

    When you connect the resistor connect it to the low (neutral) side for safety.
     
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