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Thyristors - TRIACs

Thyristors are a type of semiconductor that has four layers of alternating p-type and n-type materials and is used to control electric current.One of the most common types of thyristors is the TRIAC, or Triode for Alternating Current, which is used to control full wave AC current. The QK025N5TP is an example of a TRIAC.

Application Field

The QK025N5TP is mainly used for AC and DC motor speed control, lamp dimming, and energy-saving applications. Because of its multiple advantages, such as low power, long lifetime, and superior temperature and voltage ratings, the QK025N5TP can also be used in other industrial automation applications where continuous load switching and power control is required.

Working Principle

When a TRIAC is connected to an AC power supply, it switches on and off as the positive or negative half cycles of the supplied AC voltage exceed the level of its "gate current threshold", which is a measure of the minimum current that must flow through the TRIAC\'s gate before it can conduct electricity. When the current flowing through the TRIAC\'s gate reaches the gate current threshold, it opens the TRIAC, and current begins to flow through it until the TRIAC\'s breakover voltage is reached. This breakover voltage is the voltage at which the TRIAC turns off.

In the case of the QK025N5TP, this breakover voltage is much lower than that of a typical TRIAC, allowing it to operate at a lower switching frequency and consume less power. This makes the QK025N5TP ideal for energy saving applications, such as lamp dimming. In addition, the QK025N5TP has higher temperature and voltage ratings than other TRIACs, making it suitable for more robust industrial applications.

Conclusion

The QK025N5TP is an example of a TRIAC, a type of semiconductor that is used to control AC current. The QK025N5TP has several advantages compared to other TRIACs, including lower gate current threshold and higher temperature and voltage ratings. This makes it well-suited to a variety of applications, including motor speed control, lamp dimming, and energy-saving applications.

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