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Thyristors - SCRs - Modules

VSKH170-14D20 is one of a series of commercial-grade silicon-controlled rectifier (SCRs) modules manufactured by IXYS Corporation. Operating at a reverse-blocking voltage of up to 1700 V, it is part of their family of SCR modules, which includes devices with forward current ratings of up to 55 A. These versatile devices are suitable for a variety of applications requiring junction isolated SCRs and thyristors, such as in power switching, EMI/RFI filtering, motor control, and rectification.

Application Fields

The VSKH170-14D20 can be used in a variety of AC and DC motor control and rectification applications, such as sine wave motor drives, induction motors, switching power supplies, UPS systems, high-power DC motors, and variable frequency drives. It can be used for controlling and averaging the current in high-power DC motors for electric vehicles, agricultural machinery, and industrial robotics, as well as for correcting power factor in large power systems. The device has a high on-state junction temperature rating of 150°C, allowing it to be used in a wide range of applications, including high-temperature environments.

Working Principle

The VSKH170-14D20 is an SCR-type switch consisting of two P-type junctions connected by an N-type connection. SCRs are uni-directional switching devices that suppress transient voltage spike by blocking both anode and cathode current. SCRs are non- thermal devices, meaning the current does not increase with temperature; instead, it responds only to the applied gate current across the inner electrode.

When an externally applied gate current is provided, the thyristor switches from its blocking state and turns “ON”. It makes a low impedance connection between its two main terminals, allowing the load current to flow in the direction of the applied voltage through the device. The gate can be discharged by providing a reverse bias voltage across the gate electrodes, allowing the SCR to return to its blocking state.

When compared to other bidirectional power switches, such as TRIACs, the VSKH170-14D20 has superior performance, due to the absence of leakage current and the presence of the reverse blocking capability. This provides improved performance in terms of stability, and current and voltage regulation, as well as in terms of immunity to EMI and RFI interference.

Conclusion

The VSKH170-14D20 SCR module from IXYS Corporation is a high-performance, commercial-grade device designed for a variety of AC and DC motor control and rectification applications. It provides superior performance with low leakage current, a high off-state blocking capability, and enhanced immunity to EMI and RFI interference, making it an ideal choice for a variety of applications requiring unidirectional switching.

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