0
it is the minimum current required to maintain the SCR in conducting state.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Does the ratio of latching current to holding current depends upon gate current?
yes
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 a holding relay?
Latching relays have no default position and remain in their last position when the drive current stops.
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.
What is the effect of holding current in SCR?
The effect of holding current (anode to cathode) in an SCR is to retain the turned on state, even in the absence of any gate voltage. When used as an AC voltage controller, the SCR conducts from the moment the gate and anode goes positive until the anode goes negative on the next zero line crossing, irrespective of any further transistions on the gate.
What is the cost of holding current assets?
segnificence of holding current
What is holding current of SCR?
It is a current
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.
Does the ratio of latching current to holding current depends upon gate current?
yes
What are the difference between holding and latching current?
current holding in nothing but just hold the current. But in latch current in store for time in a temporary memory for some timeConcerning thyristors, according to the paper Thyristors - Theory, Parameters and Applications from Jurek Budek (Bedfrod Applications Lab) Holding current is the minimum value of anode current required to maintain the Thyristor in the on-state. While Latching current is the minimum value of anode currentrequired to maintain the Thyristor in the on-state immediately after switching from the off-state to the on-state has occurred and the triggering signal has been removed.When not stated assume latching current to be 3 time holding current.
What is holding current and latching current?
HOLDING CURRENT: The minimum value of current that must be there to provide a path between anode and cathode to flow anode current and thus maintain a thyristor in the on state.0 LATCHING CURRENT: The minimum anode current required to maintain a thyristor in on-state immediately after a thyristor has be triggered on. IL>IHrate of flow of charge is known as current
How do you use a thyristor on a ac circuit?
A thyristor will conduct only if enough gate current is present on the gate and enough holding current flow trough it. Once on it will remain on until the holding current is reached then it will not conduct. Since AC is changing polarity it is possible to apply gate current at any time to make it conduct it will turn off when the AC cannot supply the holding current making it an ideal phase controller
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
Why SCRs are connected in parallel?
When the load current exceeds the SCR current rating, SCRs are connected in parallel to share the load current. Further the holding currents of the devices should not be so much different that at reduced load current one of the device gets turned-off because of fall of current through it blow its holding current value.
What job positions are you currently holding with your current?
Current Job PositionTell the interviewer the title of your position with your current employer. If the title is not clear in regards to what you do, you might offer a short explanation of what the title means.
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.
What is a holding relay?
Latching relays have no default position and remain in their last position when the drive current stops.
