SEMIKRON SKKH570/16E Thyristor Module – SKKH Series

SEMIKRON SKKH570/16E — Half-Controlled SCR Bridge Module in High-Power Industrial Rectification

The SKKH570/16E occupies a well-defined position in the SEMIKRON SKKH platform: a single-phase half-controlled bridge integrating one thyristor (SCR) leg and one freewheeling diode leg within a common flat-base power module. At a rated average on-state current of 570 A and a repetitive peak off-state voltage (V_DRM) of 1600 V, this module is sized for continuous-duty rectification on 690 V AC bus systems — the standard distribution voltage in heavy industrial facilities including steel rolling mills, mining hoists, electrolytic process lines, and large-format DC motor drives.

Unlike a discrete SCR-plus-diode assembly, the SKKH topology consolidates both semiconductor elements onto a single copper base plate with a shared isolation substrate. This reduces the number of thermal interfaces in the power stack, lowers parasitic inductance in the commutation loop, and simplifies busbar routing. The result is a measurably more compact and thermally predictable converter stage compared to equivalent discrete builds.

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Technical Parameters

Hardware Logical Analysis

The SKKH570/16E ‘E’ suffix designates the enhanced isolation variant, specifying a V_isol of 3600 V_RMS versus 3000 V on the base variant. This 20% isolation margin increase is not cosmetic — it directly addresses IEC 61800-5-1 reinforced insulation requirements for variable-speed drives operating on 690 V AC networks, where transient overvoltages can reach 2.5× rated line voltage under switching conditions.

Thermal Architecture: The module’s copper base plate is direct-bonded to an aluminium oxide (Al₂O₃) ceramic substrate via a diffusion-soldered DCB (Direct Copper Bonding) process. This eliminates the thermal resistance contribution of a separate insulating pad between the semiconductor die and the heatsink contact surface. With R_th(j-c) ≤ 0.04 K/W per thyristor, the junction-to-case thermal path is among the lowest in the 500 A+ SCR module class, enabling sustained operation at rated current without derating even at elevated ambient temperatures.

EMC Design Considerations: The half-controlled bridge topology inherently generates lower-order harmonic content (predominantly 3rd and 5th harmonics) compared to a fully-controlled bridge. The freewheeling diode leg provides a continuous current path during the non-conducting half-cycle, suppressing the di/dt spike that would otherwise occur at commutation. This reduces conducted EMI on the DC bus and relaxes the specification requirements for the DC link filter capacitor bank. For installations requiring compliance with IEC 61000-3-2 Class A harmonic limits, the SKKH570/16E’s commutation profile is compatible with standard 12-pulse rectifier configurations when two modules are phase-shifted by 30°.

Gate Drive Interface: The SCR gate threshold (V_GT ≤ 3.0 V, I_GT ≤ 150 mA) is compatible with SEMIKRON SKHI-series dual-channel gate drivers without external amplification. The gate-cathode impedance is designed for pulse firing with a minimum gate pulse width of 10 µs at rated anode voltage, ensuring reliable turn-on across the full junction temperature range from −40°C to +125°C. Holding current I_H ≤ 250 mA ensures stable latching under light-load conditions where DC bus current may momentarily fall below the thyristor’s minimum sustaining level.

Surge Withstand Capability: The I_TSM rating of ≥ 9000 A (10 ms half-sine) provides substantial margin against fault current during upstream fuse clearing events. When coordinated with a fast-acting semiconductor fuse rated at ≥ 700 A / 1000 V (e.g., Bussmann 170M series), the I²t let-through of the fuse remains below the module’s rated I²t, preserving module integrity during a downstream short-circuit fault.

System Integration Benefits

• Deterministic Firing Angle Control: The SCR’s well-defined V_GT/I_GT envelope allows phase-angle firing controllers (e.g., Eurotherm 590+, Siemens SIMOREG) to achieve ±0.1° firing angle repeatability across the full thermal operating range, directly translating to ±0.1% DC output voltage regulation in open-loop configurations.
• Reduced BOM Complexity: Integrating SCR and freewheeling diode in a single module eliminates four discrete component mounting positions, two additional thermal interface layers, and the associated busbar interconnects — reducing assembly labor and potential failure points in the power stack.
• Standardized Footprint for Platform Designs: The SKKH flat-base footprint is dimensionally interchangeable across the SKKH current rating family (from SKKH92 to SKKH570), enabling engineers to design a single PCB/busbar layout that accommodates multiple power ratings by substituting the module without mechanical redesign.
• Diagnostic Transparency via Gate Monitor: The gate-cathode circuit can be monitored by the firing controller to detect open-gate faults (broken bond wire) or gate-cathode short conditions. SEMIKRON SKHI-series drivers provide integrated fault output signals that interface directly with PLC digital inputs for real-time drive health monitoring.
• High I_TSM for Fault Ride-Through: The 9000 A surge rating provides a defined fault ride-through window that allows upstream protection (fuses, circuit breakers) to clear without destroying the module, reducing unplanned downtime in continuous-process industries.
• Low V_T for Efficiency-Critical Applications: On-state voltage drop ≤ 1.75 V at 570 A yields conduction losses of approximately 998 W per thyristor at full load. In a 570 A / 690 V rectifier, this represents a conduction efficiency of >99.7% for the SCR stage alone, meaningful in energy-intensive electrolytic or electrochemical processes operating 8000+ hours per year.
• Wide Temperature Operating Range: T_j down to −40°C supports cold-start operation in outdoor or unheated enclosures common in mining, oil & gas, and wind energy applications without requiring enclosure heating elements.
• 3600 V Isolation for Multi-Drive Cabinets: The enhanced isolation voltage allows multiple SKKH570/16E modules to share a common heatsink in a multi-drive cabinet without individual insulating pads between modules and heatsink, simplifying thermal management and reducing heatsink-to-junction thermal resistance by eliminating one interface layer.

Quality Assurance & Global Logistics

Every SKKH570/16E unit dispatched from our Xiamen, China facility is a genuine SEMIKRON-manufactured component sourced through verified industrial distribution channels. Pre-shipment verification includes visual inspection of package integrity and label authenticity, date code and lot traceability confirmation, blocking voltage continuity check (V_DRM/V_RRM), and gate trigger threshold verification (V_GT / I_GT). Units are shipped in original SEMIKRON anti-static packaging with foam-protected outer cartons.

We do not supply remarked, refurbished, or counterfeit components. Certificates of Conformance (CoC) and factory test reports are available upon request. All orders carry a 12-month warranty from the date of dispatch covering manufacturing defects under normal operating conditions.

Logistics: Orders placed before 15:00 CST are dispatched same business day via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Typical transit times: 3–5 business days to Europe and North America; 2–4 business days to Southeast Asia and the Middle East. Air freight and sea freight options available for bulk project quantities. Export documentation including commercial invoice, packing list, and certificate of origin (Form A / EUR.1) provided as standard.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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