The ยูฟ่าเอสซีอาร์ Diaries
The ยูฟ่าเอสซีอาร์ Diaries
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SCRs are predominantly Utilized in equipment the place the Charge of substantial electrical power, possibly coupled with substantial voltage, is demanded. Their Procedure helps make them well suited for use in medium- to large-voltage AC ability Handle programs, which include lamp dimming, electrical power regulators and motor Regulate.
Once the SCR begins conducting, no additional gate voltage is necessary to maintain it inside the ON condition. The minimum amount current required to retain the SCR in the ON state on removal in the gate voltage is called the latching recent.
Temperature triggering occurs once the width of depletion region decreases because the temperature is improved. Once the SCR is around VPO an exceptionally compact boost in temperature will cause junction J2 to generally be eradicated which triggers the product.
In order for gate triggering to occur, the thyristor really should be inside the ahead blocking state wherever the applied voltage is below the breakdown voltage, or else ahead-voltage triggering may arise.
A silicon-controlled swap (SCS) behaves almost the same way as an SCR; but Here are a few distinctions. Compared with an SCR, an SCS switches off each time a favourable voltage/input existing is placed on another anode gate lead.
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One modest constructive voltage pulse can then be applied between the gate and the cathode. This materials an individual gate existing pulse that turns the thyristor onto its on condition. In follow, This really is the commonest system accustomed to trigger a thyristor.
SCRs can be found with reverse blocking capability, which provides for the ahead voltage drop because of the have to have to have a long, small-doped P1 area.
Some sources outline silicon-managed rectifiers and thyristors as synonymous[eight] although other resources determine silicon-controlled rectifiers as a suitable subset of the set of thyristors; the latter remaining units with at least four layers of alternating n- and p-style materials.
SCRs and identical equipment are useful for rectification of high-ability AC in higher-voltage direct existing electricity transmission. They're also Utilized in the Charge of welding devices, largely gasoline tungsten arc welding and very similar procedures.
The hold off angle α, and that is the moment the gate latest pulse is utilized with respect to the instant of all-natural conduction (ωt = 0), controls the start of conduction. Once the SCR conducts, the SCR does more info not turn off till the current through the SCR, is, becomes negative. is stays zero right until A further gate present-day pulse is utilized and SCR Once more begins conducting.[twelve]
At enough voltages, the thyristor changes to its on state with lower voltage fall and enormous ahead current. In this instance, J1 and J3 are previously ahead-biased.
An SCR could be brought from blocking manner to conduction manner in two methods: Both by rising the voltage concerning anode and cathode beyond the breakover voltage, or by applying a constructive pulse for the gate.
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A simple SCR circuit with a resistive load An easy SCR circuit could be illustrated using an AC voltage supply connected to a SCR that has a resistive load. With no an applied recent pulse towards the gate of your SCR, the SCR is still left in its ahead blocking state. This will make the start of conduction of your SCR controllable.