QJ4016LH2TP

Thyristors - TRIACs

A TRIAC is a three-terminal ac switch and stands for “Triode for Alternating Current”. They are commonly used for switching and controlling power in AC circuits. A TRIAC is similar to two SCRs connected in inverse parallel. They can be triggered at any point in ac cycle.

QJ4016LH2TP Application Field and Working Principle

The application field of QJ4016LH2TP is general-purpose AC control switches and solid-state relays. It operates as an AC switch for lighting, heating and for all the application requirements of both ON and OFF control in AC circuits. Because of its small size and cost efficiency, it is suitable for various affordable consumer electronics and consumer applications.

QJ4016LH2TP works on the principle of bidirectional conduction. The basic structure is a four-layer thyristor in which the anode and cathode are connected to the first and second layers respectively. The anode is connected to the main current path of the circuit and the cathode is connected to the third layer. The control characteristicsÊare controlled by the external circuit which drives a small current through the fourth layer. This current is known as the gate current and is used to control the triggering of the device. When voltage is applied to the anode and cathode, current flows in both directions.

A positive voltage applied across the anode and cathode will forward bias the TRIAC, allowing current to flow from the anode to the cathode. This is known as the “positive half cycle”. When a negative voltage is applied, the current will flow from the cathode to the anode, known as the “negative half cycle”. The amount of current flowing through the TRIAC can be controlled by varying the amount of gate current.

In addition, the QJ4016LH2TP can be used with phase angle control to accurately control the phase angle of a voltage supply, allowing the current to be controlled. This control is especially useful in a variety of applications such as industrial heating and motor speed control. Also, it can be used in AC motor starters to reduce the start-up current.

Overall, the QJ4016LH2TP is a small and efficient device that can be used in a variety of applications where it is necessary to switch AC current. It is particularly well suited to affordable consumer electronics and consumer applications.