QK004L4

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Thyristors are semiconductor devices that act as switches, allowing or blocking current depending on the voltage applied. The TRIAC, also called Triode AC, is a three-terminal semiconductor device composed of four layers of alternating P-type and N-type materials. It is used for controlling AC circuits and provides the ability to switch the current in both directions. The QK004L4 is one of the newer TRIAC technologies and offers excellent performance, reliability and cost advantages over other competing technologies.

Application Field

The applications of QK004L4 TRIACs are diverse, but tend to be predominately used in the industrial environment for high power AC switch applications. Typical application fields of the QK004L4 include:

• Power supply components
• Solid-state relays
• AC motors and controls
• Light dimmers
• Temperature control
• Voltage regulation
• AC switching in automotive components

Due to their high power rating, the QK004L4 are also used in automotive applications, including spark control and fuel injector drivers.

Working Principle

The QK004L4 TRIAC is a three-terminal device with an anode, a gate and a cathode connected internally. The anode is connected to the positive AC voltage, while the cathode is connected to the negative AC voltage. The gate is the control terminal, which is usually connected to a negative voltage to block the current passing through the device. When a positive voltage is connected to the gate, a current starts to flow between the anode and the cathode, allowing the current to flow through the device.

The conduction of current across the TRIAC is controlled by two parameters, the current and voltage. When the voltage is above its threshold value, the TRIAC will turn on and current starts to flow. On the other hand, if the voltage is below the threshold, the TRIAC will turn off, stopping the current from passing through.

The maximum voltage and current that the QK004L4 TRIAC can handle depends on its design, which can range from 2 Amps to 25 Amps and from 400Volt to 500Volt. Depending on the application, the device needs to be chosen according to these parameters.

Conclusion

The QK004L4 TRIAC is a powerful, reliable and cost-effective device used in AC Switch applications. Its applications range from power supply, motors, light dimmers, automotive components and other AC switching applications. The working principle and internals of the device make it a highly efficient and safe solution for these applications and make it one of the more popular technologies available in the market.

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