The ยูฟ่าเอสซีอาร์ Diaries
The ยูฟ่าเอสซีอาร์ Diaries
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Contrary to an SCR, an SCS might be induced into conduction any time a damaging voltage/output present-day is applied to that same lead.
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Temperature triggering occurs once the width of depletion area decreases as being the temperature is increased. Once the SCR is around VPO an exceedingly little increase in temperature brings about junction J2 being eradicated which triggers the device.
In order for gate triggering to happen, the thyristor ought to be within the ahead blocking condition the place the applied voltage is lower than the breakdown voltage, otherwise ahead-voltage triggering may possibly take place.
When a destructive voltage is placed on the anode as well as a good voltage into the cathode, the SCR is in reverse blocking method, making J1 and J3 reverse biased and J2 ahead biased. The gadget behaves as two diodes related in series.
Ahead-voltage triggering takes place in the event the anode–cathode ahead voltage is increased With all the gate circuit opened. This is recognized as avalanche breakdown, through which junction J2 will stop working.
Only one compact positive voltage pulse can then be used concerning the gate and the cathode. This supplies only one gate present-day pulse that turns the thyristor on to its on condition. In apply, This can be the most common method utilized here to induce a thyristor.
SCRs can be found with reverse blocking capability, which adds towards the ahead voltage drop as a result of want to possess a extended, low-doped P1 area.
An SCR incapable of blocking reverse voltage is named an asymmetrical SCR, abbreviated ASCR. It generally has a reverse breakdown score during the tens of volts.
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TRIACs have a few prospects: a gate guide and two conducting prospects, generally known as MT1 and MT2. If no existing/voltage is placed on the gate guide, the TRIAC switches off. Then again, if the bring about voltage is placed on the gate guide, the TRIAC switches on.
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An SCR is often brought from blocking mode to conduction manner in two strategies: Both by escalating the voltage among anode and cathode past the breakover voltage, or by implementing a favourable pulse for the gate.
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A straightforward SCR circuit using a resistive load A straightforward SCR circuit can be illustrated employing an AC voltage resource linked to a SCR using a resistive load. Without the need of an applied existing pulse into the gate from the SCR, the SCR is still left in its forward blocking condition. This would make the beginning of conduction of the SCR controllable.