Why flywheel diode is used with Relay?

[Mohit Soni]

Why flywheel diode is used with Relay?

[sethupathy]

 

 

 

 

 

 

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

[bikash panda]

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

[AJISH ALFRED]

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.

[pritesh]

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 .

 

 

[Trev]

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.

[Author]

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