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You are here: Home / Topics / Why flywheel diode is used with Relay?

Why flywheel diode is used with Relay?

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Electronics › Electronics › Why flywheel diode is used with Relay?

  • This topic has 5 replies, 6 voices, and was last updated 11 years, 4 months ago by Trev.
Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • October 28, 2011 at 8:14 am #3894
    Mohit Soni
    Participant

    Why flywheel diode is used with Relay?

    November 2, 2011 at 9:09 am #6776
    sethupathy
    Participant

     

     

     

     

     

     

                     it is used to protect the circuit from -ve edge triggering

    November 8, 2011 at 2:55 pm #6818
    bikash panda
    Participant

    Relay is nothing but a inductor and it stores energy …to reduce the energy a diode is used to form a loop..

    April 18, 2012 at 3:02 pm #7491
    AJISH ALFRED
    Participant

    Relay is actually an inductor and its basic property is to check the change in flux across it by inducing a voltage.

    Suppose you turn on the relay and there is a current flow through the coil, if you turn it off suddenly there will be a change of flux. The coil will try to check the change of flux by inducing a voltage in the opposite direction of the previous. This voltage can affect the proper functioning of the rest of the circuitary and thus to catch that voltage a diode is used. It will conduct and short circuit the coil only when this reverse volage occurs.

    April 27, 2012 at 7:02 am #7551
    pritesh
    Participant

    inductor have property it oppose the change in current .

    V=L di/dt

     

    V=VOLTAGE GENERATE

    L=INDUCTANCE

    di/dt= change in current

     

    suddenly when we switch off the realy , suddenly flow of current stop ,so opposite voltage generate and this will damage the component ,so remove this problem we use Free wheel diode ,it bypass the currnet .

     

     

    January 25, 2014 at 6:42 pm #10890
    Trev
    Participant

    I know a flywheel diode prevents back e.m.f from triggering other circuits and so I wondered if I could use one across the sparking contacts to prevent the RCD tripping when my new immersion heater is disconnected by the timer or manual switch.

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