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Thyristors - TRIACs

Thyristors, also referred to as TRIACs (Thistle Triacs) or Thyristors, are solid-state semiconductor switches, usually in a variety of shapes and sizes. They are commonly found in a variety of applications ranging from motor control to power distribution and power conditioning. In a electrical circuit, Thyristors are usually used to switch or control current and voltage on the load side.

BT136-600E/02,127 Application Field

BT136-600E/02,127 is a high power TRIAC capable of switching AC current up to 600V RMS. As such, they commonly employed in high voltage and high current applications. Some of the applications they are used in include:

• Motor Control - to control the speed and power of AC and DC motors.
• Power Distribution and Monitoring Systems - typically in the form of control relays or motor starters.
• Lighting Control - such as those found in smart lighting systems.
• Industrial Process Control Systems - often used as part of process and process control.
• Power Conditioning - to switch or control AC and DC power sources.

BT136-600E/02,127 Working Principle

Thyristors, or TRIACs, rely on the flow of current in three directions (positive, negative, and off) to maintain the electrical flow in a circuit. BT136-600E/02,127 TRIACs use a two-gate structure with one gate connected to the main terminal (MT) and the other gate connected to the control terminal (CT).

When a voltage is applied to the control terminal, a current begins to flow through the thyristor. This current generates a field that attracts electrons from the main terminal and thus generates an avalanche (current surge) that creates a conducting path between the main and control terminals. As such, when the control terminal is open, the thyristor effectively "switches off" and the current flow is stopped. Additionally, the current is capable of flowing in both directions, meaning the thyristor is capable of controlling both positively and negatively polarized current.

The process of turning the thyristor on and off is referred to as "gating." Gating is typically performed using either a switch (manual gating) or a logic circuit (electronic gating). Once activated, the thyristor continues to conduct current until either the control terminal is opened or the current reaches its predetermined maximum.

Conclusion

BT136-600E/02,127 is a high power TRIAC capable of switching up to 600V RMS of AC current. It is usually employed in applications that require high voltage and high current, such as motor control, power distribution systems, lighting control, industrial process control systems, and power conditioning. The TRIAC operates by allowing a current to flow in three directions – positive, negative, and off – and can be “gated” via a manual switch or an electronic logic circuit.

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