The ยูฟ่าเอสซีอาร์ Diaries
The ยูฟ่าเอสซีอาร์ Diaries
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SCRs are mostly Employed in units where by the control of superior ability, quite possibly coupled with large voltage, is demanded. Their Procedure would make them appropriate for use in medium- to high-voltage AC electric power Handle programs, such as lamp dimming, electric power regulators and motor Handle.
As soon as the SCR begins conducting, no extra gate voltage is needed to take care of it within the ON state. The least current essential to keep the SCR during the ON state on removal in the gate voltage is called the latching recent.
Temperature triggering takes place when the width of depletion region decreases as being the temperature is amplified. When the SCR is around VPO an exceedingly little rise in temperature will cause junction J2 to be eliminated which triggers the unit.
In order for gate triggering to take place, the thyristor must be while in the ahead blocking state where by the utilized voltage is lower than the breakdown voltage, if not forward-voltage triggering may come about.
A silicon-controlled swap (SCS) behaves just about the exact same way as an SCR; but There are some differences. Compared with an SCR, an SCS switches off every time a constructive voltage/input latest is applied to another anode gate direct.
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An individual compact optimistic voltage pulse can then be used in between the gate along with the cathode. This provides an individual gate recent pulse that turns the thyristor onto its on state. In practice, this is the commonest process utilized to bring about a thyristor.
SCRs can be obtained with reverse blocking ability, which provides into the ahead voltage fall due to need to have a lengthy, minimal-doped P1 area.
Some sources define silicon-managed rectifiers and thyristors as synonymous[eight] when other resources define silicon-controlled rectifiers as an appropriate subset of your list of thyristors; the latter currently being units with at the least four levels of alternating n- and p-form substance.
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The hold off angle α, and that is the instant the gate present-day pulse is applied with regard to the instant of normal conduction (ωt = 0), controls the beginning of conduction. After the SCR conducts, the SCR would not change off right until the current from the SCR, is, gets to be detrimental. is stays zero till One more gate current pulse is utilized and SCR Yet again commences conducting.[12]
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An SCR might be introduced from blocking manner to conduction manner in two methods: Either by rising the voltage concerning here anode and cathode beyond the breakover voltage, or by applying a optimistic pulse for the gate.
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A straightforward SCR circuit using a resistive load A straightforward SCR circuit could be illustrated applying an AC voltage source linked to a SCR with a resistive load. With no an used existing pulse into the gate on the SCR, the SCR is left in its forward blocking point out. This helps make the beginning of conduction from the SCR controllable.