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Check the databook for the SCR you are using. Without knowing the part number, I can't look it up for you.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoA SCR has to be both voltage rated and current rated to operate properly in a circuit.
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What is avalanche break down in scr?
A: As the reverse voltage is applied to the SCR increases at a certain point the device will start to conduct that is defined as the breakdown voltage for that device
Application of diac?
The diac acts like an open-circuit until its switching or breakover voltage is exceeded. At that point the diac conducts until its current reduces toward zero (below the level of the holding current of the device). The diac, because of its peculiar construction, does not switch sharply into a low voltage condition at a low current level like the SCR or triac. Instead, once it goes into conduction, the diac maintains an almost continuous negative resistance characteristic, that is, voltage decreases with the increase in current. This means that, unlike the SCR and the triac, the diac cannot be expected to maintain a low (on) voltage drop until its current falls below a holding current level.
What will stop conduction once an scr breaks into conduction?
What does "the following"mean ?
Does an SCR work on DC or ac?
SCR's are mainly used in AC circuits. They could be used in DC circuits but they then would not be able to turn off. They require the zero crossing of the AC circuit to turn off. Then when positively biased they can be turned back on.
What is scrack?
According to Urban Dictionary , Scrack is the area on the human male between the scrotum and the anus. Thus being called scr ( for scrotum ) and ack ( for your arse crack ). :)
What is avalanche break down in scr?
A: As the reverse voltage is applied to the SCR increases at a certain point the device will start to conduct that is defined as the breakdown voltage for that device
What is a threshold voltage in scr?
the voltage at which the current conduction occur
Is scr is high current rating?
yes
Is SCR the unipolar device?
SCR is bipolar device since current is due to both electrons as well as holes.
What is the voltage rating of silicon controlled rectifier?
It depends on the particular SCR. They make them in all different voltage ratings. Please specify the particular SCR you are interested in.
Is scr current controlled device?
yes it is current controlled
How is an SCR turned off?
Once an SCR has been turned on by means of a gate pulse, it latches, or remains on. The only way to turn the SCR off is to either remove the anode to cathode voltage, remove the load current (SCR's have a minimum current below which they will not fire), or reverse bias the SCR. If the SCR is used in an AC circuit, turn off is easy. This is because the voltage falls to zero, then reverse biases the SCR every cycle. This naturally turns off the SCR. In fact, you have to re-trigger the gate every cycle to turn it back on. In a DC circuit, the SCR must be reset by some means as mentioned above. Once the SCR fires, there is nothing you can do to the gate to control the device. The gate only turns it on, not off. There is a similar device, called a GTO, or gate-turn-off device, that can be turned off via the gate. Once an SCR is on it will not turn -off unless the minimum holding current is met. that can be accomplished by reversing anode polarity or by decreasing loading to below holding current
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
What is LED characteristics curve?
A: Any device whether it be diode, led, scr, triac and so forth has characteristic of current/voltage behaviour as these I/v are varied
What is SCR Give its application?
scr is a silicon control rectifier used to control the rectifing voltage.. its a bidirectional device can use it for both the directions......
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.
How many terminal leads does an SCR have?
A SCR or THYRISTOR has three leads, an anode and a cathode and the gate. It is a gate controlled diode which turns on once the gate voltage is reached and remains on until the current flowing through it is shut off. (either by another device or by an ac voltage across it passing though zero.) Large SCR's sometime have an extra lead but this is connected to the anode or cathode.
