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Latching Current is the minimum current needed on the gate to fire or trigger an SCR.
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∙ 11y ago
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How do you calculate holding current of scr when latching current is given?
we know that ratio of holding current to latching current in scr is 0.4.
What is holding current of SCR?
It is a current
Is scr current controlled device?
yes it is current controlled
Contrast the scr and the triac?
Essentially an Scr is a solid state switch that will only allow current to flow in one direction. A triac is essentially two scr's in Anti- parallel that allows current to pass in both directions.
Is SCR the unipolar device?
SCR is bipolar device since current is due to both electrons as well as holes.
How do you calculate holding current of scr when latching current is given?
we know that ratio of holding current to latching current in scr is 0.4.
Why latching current is more than holding current in thyristor?
Holding current is a kind of Imin i.e., a minimum rating current which should not be decreased less than this limit so that SCR will be off(Maximum limit).Whereas latching current is again a limit which is Imini.e., a minimum current that should be there to make it on(Minimum limit).So obviously Holding current is more than latching current.If u still have the confusion go through the link below ALi RAZA
What is holding current of SCR?
It is a current
What is the ratio of latching current to holding current?
Latching current is the current flowing between anode to Cathode when thyristor is turned on using gate pulse. If the gate pulse is removed before the required min amount of latching current value is not reached thyristor will turn off. To keep the thyristor in on state the gate pulse duration should be so adjusted that the min latching current value is reached before it ends.
Can a diac trigger scr?
No, a Diac cannot trigger an SCR because when the Diac turns ON, the current through the Diac is around 9 mA. The gate threshold current of an SCR is typically 5 mA, which is less. So the SCR can get damaged due to this high gate current.
What happens if voltage is constant and current is varying when an scr triggers?
Even if the current is varying,as long as the current reaches the value required to trigger the SCR, it will snap into operation. The SCR will remain in operation until the current through it drops to a value below the holding current.
Does the ratio of latching current to holding current depends upon gate current?
yes
Is scr current controlled device?
yes it is current controlled
What happens if gate voltage of an ON scr is decreased?
A: Nothing after an SCR conduct the gate has no more control to shut it off. So how do we shut off an SCR two way reverse the voltage on the SCR or reduce the current below the holding current. SCR are not DC friendly once on they stay on until see above
Is scr is high current rating?
yes
Contrast the scr and the triac?
Essentially an Scr is a solid state switch that will only allow current to flow in one direction. A triac is essentially two scr's in Anti- parallel that allows current to pass in both directions.
Is SCR the unipolar device?
SCR is bipolar device since current is due to both electrons as well as holes.
