Semikron SKKT 570/18 E | Robust Thyristor/Diode Module for High-Power AC Control
The Semikron **SKKT 570/18 E** is a high-performance thyristor/diode module engineered for demanding industrial power control applications. Housed in the industry-standard SEMIPACK® 3 package, this module combines a high current rating of 570A with a robust 1800V blocking voltage. It is not just a component; it's a foundational building block for creating highly reliable and cost-effective soft starters, AC power controllers, and controlled rectifiers where durability and precise line-frequency control are paramount.
Technical Deep Dive: The Engineering Behind the SKKT 570/18 E
- Optimized Thyristor/Diode Topology: The **SKKT 570/18 E** features a common cathode series connection of a thyristor and a diode. This configuration is purpose-built for single-phase controlled bridge rectifiers and AC controllers. This design simplifies the overall circuit, reducing component count and potential failure points compared to using discrete components, directly leading to a more compact and reliable end-system.
- Glass Passivated Thyristor Chips: At the heart of this module's reliability are glass passivated chips. This process creates a hermetically sealed, stable junction that is exceptionally resistant to environmental contaminants and thermal stress. For the system designer, this translates into superior long-term blocking stability and a significantly extended operational lifespan, even in harsh industrial settings with temperature fluctuations and potential humidity.
- Superior Thermal Management: The module utilizes an aluminum oxide (Al2O3) ceramic substrate for direct copper bonding (DCB). This ensures excellent electrical isolation while providing a low thermal resistance path. The result is efficient heat transfer from the silicon chips to the heatsink, allowing the module to handle high currents consistently without succumbing to thermal runaway, a critical factor in high-power applications.
Application Scenarios: Where the SKKT 570/18 E Excels
The true value of the **Semikron SKKT 570/18 E** emerges in its application-specific problem-solving capabilities:
- Soft Starters for Large AC Motors: By precisely managing the phase angle control, this module gradually ramps up voltage to the motor. This mitigates damaging inrush currents, reduces mechanical shock on gearboxes and couplings, and prevents disruptive voltage sags on the power line. The outcome is increased motor and system longevity with reduced maintenance.
- Industrial Heating & Lighting Control: For applications like large industrial furnaces or theater lighting dimmers, the module provides seamless AC power regulation. Its ability to handle high currents allows for precise temperature or brightness control, optimizing energy consumption and improving process consistency.
- Controlled Rectifiers: When used in a bridge configuration, these modules form a robust and cost-effective front-end for high-power DC supplies or DC motor drives. Their inherent ruggedness makes them ideal for applications that experience frequent line disturbances.
Key Technical Parameters
| Parameter | Value |
|---|---|
| Repetitive Peak Reverse Voltage (VRRM) | 1800 V |
| Average On-State Current (IT(AV)) @ Tcase=85°C | 570 A |
| RMS On-State Current (ITRMS) | 900 A |
| Surge On-State Current (ITSM) @ 50 Hz | 15500 A |
| Gate Trigger Current (IGT) | 200 mA (max) |
| Operating Junction Temperature Range (Tj) | -40 to +130 °C |
Industry Insight: The Enduring Role of Thyristor Technology
While modern IGBT modules dominate high-frequency applications like inverters, thyristors like the **SKKT 570/18 E** remain the undisputed champion for high-power, line-frequency (50/60Hz) control. Their inherent robustness, high surge current capability, and simpler gate drive requirements make them a more reliable and cost-effective solution for applications that do not require high switching speeds. For an in-depth comparison of power devices, see our guide on power semiconductor selection.
Frequently Asked Questions (FAQ)
- Q: Can the SKKT 570/18 E be used for high-frequency switching applications like a switching mode power supply (SMPS)?A: No. This module is a line-commutated thyristor, designed for low-frequency applications (typically 50/60 Hz). Its turn-off time is too slow for high-frequency switching, where IGBTs or MOSFETs would be the appropriate choice.
- Q: What is a critical factor when designing a heatsink for this module?A: The most critical factor is ensuring a very low thermal resistance between the module's baseplate and the heatsink. This requires a flat mounting surface, correct application of a high-quality thermal interface material (TIM), and adherence to the specified mounting torque to maximize heat dissipation and ensure reliability.
For detailed application support or to discuss how the **Semikron SKKT 570/18 E** can be integrated into your next high-power control project, please do not hesitate to contact our technical specialists.
