TCU426320HDH

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TCU426320HDH Application Field and Working Principles

Thyristors are a special type of semiconductor which consists of four layer PNPN (or NPNP) structures, with three layers of P-type material catching two N-type layers. As they are able to store and release power, they are used in applications such as power switches and in many switching circuits. Any change in the current or voltage through thyristors will cause them to switch from a stable off-state to an on-state. The TCU426320HDH is a 600V silicon controlled rectifier (SCR) designed for applications requiring high efficiency and power switching. This device is suitable for many- and high frequency AC triggering.

Application Fields of the TCU426320HDH

The TCU426320HDH is primarily used in the fields of power control, power switching and signal switching. Its large inrush current capability can drive large inductive loads, while its reverse peak pulse current capability is beneficial for smaller inverter applications. Typical applications of the TCU426320HDH include motor control, UPS systems, welding inverters and cycloconverters.

Working Principles of the TCU426320HDH

The SCR consists of four PNPN layers. It does not conduct current in either direction until a voltage is applied to the gate, the control electrode. When the gate voltage exceeds the cathode voltage by a small amount, usually a few volts, a small current is allowed to flow from gate to cathode and the SCR turns on. When the voltage is removed, the SCR remains in the on-state until enough current is applied to the anode to cause it to turn off. The TCU426320HDH is protected against over-voltage, over-current, and reverse voltage.

Once the SCR is in the on-state, current flows freely in the forward direction, yet the thyristor only partially blocks current in the reverse direction, allowing voltage dependent leakage current to pass through. The TCU426320HDH has a high reverse blocking capability of up to 600V. This allows multiple SCRs to be connected in series to form a high voltage blocking device.

In addition, the TCU426320HDH has a fast switching speed of 200 kHz, allowing for quick switching. It also features a low reverse voltage drop, allowing it to maintain a good efficiency rating when used as a motor control.

Conclusion

The TCU426320HDH SCR is a versatile device used for a range of applications such as power control, power switching, signal switching and motor control. The device is protected against over-voltage and over-current, has a high reverse blocking capability of up to 600V and has a fast switching speed of 200 kHz. With its numerous benefits, the TCU426320HDH is suitable for many high-frequency AC triggering purposes.

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