The ยูฟ่าเอสซีอาร์ Diaries
The ยูฟ่าเอสซีอาร์ Diaries
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SCRs are largely Employed in devices the place the Charge of superior electricity, maybe coupled with substantial voltage, is demanded. Their operation would make them appropriate for use in medium- to higher-voltage AC power Regulate applications, which include lamp dimming, electricity regulators and motor Manage.
As soon as the SCR starts conducting, no additional gate voltage is required to keep up it in the ON condition. The minimum amount existing important to sustain the SCR during the ON state on elimination of your gate voltage is called the latching existing.
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To ensure that gate triggering to manifest, the thyristor need to be during the ahead blocking state exactly where the used voltage is fewer than the breakdown voltage, usually forward-voltage triggering might occur.
A silicon-managed change (SCS) behaves nearly a similar way as an SCR; but there are a few discrepancies. As opposed to an SCR, an SCS switches off when a constructive voltage/enter recent is placed on Yet another anode gate guide.
Ahead-voltage triggering takes place if the anode–cathode ahead voltage is greater While using the gate circuit opened. This is known as avalanche breakdown, throughout which junction J2 will break down.
Typically, the reverse blocking voltage rating and ahead blocking voltage rating are exactly the same. The everyday application to get a reverse blocking SCR is in current-supply inverters.
SCRs can be found with reverse blocking capability, which provides towards the ahead voltage drop due to need to have to have a very long, minimal-doped P1 region.
An SCR incapable of blocking reverse voltage is called an asymmetrical SCR, abbreviated ASCR. It ordinarily incorporates a reverse breakdown ranking inside the tens of volts.
SCRs and identical devices are utilized for rectification of substantial-electric power AC in superior-voltage immediate current energy transmission. They are also used in the control of welding equipment, mainly gas tungsten arc welding and similar procedures.
TRIACs have 3 qualified prospects: a gate lead and two conducting potential customers, often called MT1 and MT2. If no existing/voltage is placed on the gate direct, the TRIAC switches off. However, if the induce voltage is applied to the gate guide, the TRIAC switches on.
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Asymmetrical SCRs might be fabricated with a reverse conducting diode in the identical offer. They are often known as RCTs, for reverse conducting thyristors.
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An easy SCR circuit having a resistive load A simple SCR circuit is usually illustrated working with an AC voltage supply connected to a SCR which has a resistive load. Without the need of an utilized present pulse on the gate on the SCR, the SCR is left in its ahead blocking condition. This helps make the beginning of conduction with read more the SCR controllable.