In the realm of modern power electronics, Insulated Gate Bipolar Transistor (IGBT) modules are central to achieving high-efficiency power conversion. The SKiiP 26NAB065V1, an Intelligent Power Module (IPM) from Semikron's MiniSKiiP series, sets the benchmark for mid-to-low power variable frequency drive applications thanks to its high integration, outstanding reliability features, and optimized electrical performance.
1. What is the MiniSKiiP Series?
The MiniSKiiP series by Semikron (now Semikron Danfoss) is an integrated power module platform engineered for mid-to-low power motor drive and inverter applications in the power electronics industry . Utilizing its unique and highly reliable SKiiP Technology, it establishes an industry standard for enhancing system reliability, simplifying the assembly process, and achieving high power density.1
The core advantage of the MiniSKiiP series lies in its adoption of Semikron’s patented SKiiP (Semikron Integrated Intelligent Power) Technology .
Traditional power modules require a baseplate to connect the ceramic isolation layer to the heatsink. In contrast, MiniSKiiP uses a baseplate-less design, employing a direct pressure system to establish thermal contact between the Direct Bonded Copper (DBC) ceramic substrate and the heatsink . This design significantly lowers thermal resistance and provides superior heat dissipation performance.3
2. SKiiP 26NAB065V1 Introduction
The SKiiP 26NAB065V1 is a high-performance IPM specifically designed for compact inverters . It is more than just a collection of IGBT chips; it is a complete power system solution, integrating IGBTs, diodes, the gate drive, and protection circuits into a single unit .
The module features a comprehensive power topology known as the Converter-Inverter-Brake (CIB) configuration . This integrated design drastically simplifies the end-user’s system complexity and Bill of Materials (BOM), with typical applications including:
Three-Phase Bridge Rectifiers 5
Brake Choppers 5
Three-Phase Bridge Inverters 5
Compact Variable Frequency Motor Drives (VFDs)
3. Introduction to SKiiP Technology
At its core, SKiiP (Semikron Integrated Intelligent Power) Technology relies on a revolutionary baseplate-less structure and highly dependable interconnection methods, which are crucial for the SKiiP 26NAB065V1's high reliability .
Baseplate-less Design and Pressure Contact: Conventional power modules rely on solder to connect the ceramic substrate to a copper baseplate. SKiiP Technology pioneered a design that eliminates the baseplate, instead using a direct pressure system to achieve thermal contact between the DBC ceramic substrate and the heatsink . This structure ensures very low thermal resistance and delivers excellent cooling performance .
Spring Contact System (Solder-Free Connections): A key innovation of the module is the use of highly reliable spring pressure contacts to replace traditional solder joints for all power and auxiliary connections . Solder fatigue is a primary failure mechanism in power modules subjected to thermal cycling stress . Eliminating the solder connection means the SKiiP 26NAB065V1 is exceptionally resilient to thermal cycling and environmental stress, significantly extending its durability and lifespan in fluctuating load applications .
IGBT and Diode Chip Technology: The SKiiP 26NAB065V1 utilizes Ultrafast Non-Punch Through (NPT) IGBTs, complemented by robust free-wheeling diodes featuring CAL (Controlled Axial Lifetime) technology . The application of these advanced chip technologies optimizes the module's switching performance and effectively reduces both conduction and switching losses .
4. Analysis of Key Electrical Performance Indicators
Based on the specifications, the SKiiP 26NAB065V1 exhibits electrical performance optimized for mid-power applications:
| Parameter | Symbol | Typical Value | Unit | Test Condition |
|---|
| Nominal Collector Current | ICnom | 50 | A | Tj = 125 degrees C |
| Collector-Emitter Saturation Voltage | VCEsat | 2.5 (2.2) | V | ICnom = 50 A, Tj = 25 (125) degrees C |
| Turn-off Energy Loss | Eoff | 0.9 | mJ | ICnom = 50 A, Tj = 125 degrees C |
| IGBT Junction-to-Heatsink Thermal Resistance | Rth(j-s) | 0.75 | K/W | per IGBT |
| Inverter/Chopper Diode Forward Voltage | VF | 1.9 (1.9) | V | IFnom = 50 A, Tj = 25 (125) degrees C |
| Module Weight | W | 65 | g | |
These metrics underscore the module's design goal of achieving low losses and high-efficiency conversion. For example, the low turn-on (Eon is 1.3 mJ) and turn-off energy losses (Eoff is 0.9 mJ) allow the module to operate at higher switching frequencies while maintaining a lower temperature rise .
5. Integrated Smart Protection Functions
As an IPM, the SKiiP 26NAB065V1 integrates comprehensive protection circuits to ensure safe operation and high system reliability under various adverse conditions . These protection features include:
Short Circuit Protection: IGBT short-circuit protection is implemented via the collector-emitter voltage (VCE) monitoring mechanism .
Temperature Monitoring: The module incorporates a built-in NTC (Negative Temperature Coefficient) sensor 5, which is used for real-time monitoring of the heatsink temperature.6 The internal driver shuts down the IGBTs and sets an error latch if the temperature exceeds a predefined threshold (e.g., 115 degrees C plus/minus 5 degrees C) .
DC Bus Voltage Monitoring: The system monitors if the DC voltage exceeds the maximum limit (UZmax); upon overvoltage, the driver turns off and sets an error state .
Supply Under-Voltage Protection: The driver monitors if the supply voltage drops below the predetermined limit value when using 15 VDC or 24 VDC power supplies .
These integrated protection mechanisms significantly simplify the design of system-level protection circuits, ensuring the module's self-protection capabilities during anomalous situations, thereby extending the overall system lifespan.
6. SKiiP 26NAB065V1 Dimensions
SKiiP 26NAB065V1 Dimensions
Below are the physical dimensions and weight information for the SKiiP 26NAB065V1 module, which uses the MiniSKiiP 2 housing:
| Specification | Value | Unit | Notes |
|---|
| Length | 59 | mm | MiniSKiiP 2 Housing Dimension |
| Width | 52 | mm | MiniSKiiP 2 Housing Dimension |
| Height | 16 | mm | MiniSKiiP 2 Housing Dimension |
| Net Unit Weight | 65 | g | Module weight |
7. SKiiP 26NAB065V1 Pinout
The pinout design of the SKiiP 26NAB065V1 module strictly follows the MiniSKiiP series standard, characterized by high integration and the use of the solder-free spring contact system for all connections .
SKiiP26NAB065V1 Pinout
The module adopts the CIB (Converter-Inverter-Brake) topology 5, so its pinout covers power input, the DC bus, three-phase inverter output, and low-voltage control and protection signals.
I. Power Terminals
These connections interface directly with the power source and the motor via highly reliable spring contacts.
| Functional Section | Purpose | Description |
|---|
| AC Input | Three-Phase Rectifier Input (Converter) | Connects to the three-phase AC power lines (L1, L2, L3). |
| DC Bus | Positive/Negative DC Bus (DC+ / DC-) | Connects to the DC power supply input or energy storage capacitors. |
| AC Output | Three-Phase Inverter Output (Inverter) | Connects to the three-phase motor windings (U, V, W). |
| Brake Chopper | Chopper Connection Point | Connects to the braking resistor for handling regenerative energy. |
II. Auxiliary and Control Terminals
As an Intelligent Power Module (IPM), the SKiiP 26NAB065V1 integrates the gate drive and protection circuits. These control signals connect to the control PCB via a separate set of low-voltage spring contacts:
| Signal Type | Function | Description |
|---|
| Driver Power Supply | Power Supply (VS1 / VS2) | Provides stable power to the internal integrated gate drive circuitry, typically 15 VDC and 24 VDC supplies.6 |
| Control Input | Switching Signals (Gate Signals) | Receives PWM signals from the microcontroller to control the switching actions of all internal IGBTs. |
| Protection Output | Error Signal (ERROR OUT) | The module outputs a signal to notify the controller when faults like short circuit, overvoltage, or overtemperature occur.6 |
| Temperature Sensing | NTC/PTC Sensor | The module includes an NTC resistor to monitor heatsink temperature for overtemperature protection.5 |
| Reset/Enable | RESET / ON | Used to clear the error latch (RESET) or enable/disable the brake chopper (ON) . |
8. SKiiP 26NAB065V1 Applications
The primary application scenarios for the SKiiP 26NAB065V1 are focused on industrial drive and power conversion systems that demand high efficiency, compact dimensions, and superior reliability:
1. Compact Variable Frequency Motor Drives (VFDs)
This is the most typical and core application area for the MiniSKiiP series.1
Industrial Automation and Control: The module's integrated topology, which includes a three-phase bridge rectifier, brake chopper, and three-phase bridge inverter (CIB) 2, makes it the ideal 'core' component for building a complete VFD. It is widely used for motor control in mid-to-low power devices such as pumps, fans, and conveyor systems. These applications place extremely high demands on the module's reliability, particularly under thermal cycling .
High Power Density Requirements: The MiniSKiiP's baseplate-less design and optimized thermal management enable it to deliver high power output within a minimal package size . This allows customers to design inverters with higher power ratings within the same or smaller volume, perfectly aligning with the modern industry's pursuit of equipment miniaturization .
2. General Purpose Inverters and Power Supplies
Although primarily engineered for motor drives, its high performance and integration also make it suitable for other mid-to-low power conversion systems:
Universal Inverter Systems: The module integrates the IGBTs, diodes, gate driver, and protection circuits 3, which reduces the number of external components and simplifies the overall design and Bill of Materials (BOM) of the power conversion unit .
High Reliability Environments: Because SKiiP Technology uses spring contacts instead of traditional solder joints , it offers outstanding resistance to thermal cycling and environmental stress . Consequently, it is highly suitable as a power core in industrial environments where temperature fluctuation is severe or where operating cycles are highly variable . Applications benefiting from the excellent reliability of spring contacts include standard drives, servo drives, solar inverters, UPS systems, and specialized uses like agricultural vehicles or pitch drives in wind turbines .
9. Advantages of SKiiP 26NAB065V1
The SKiiP 26NAB065V1 and its MiniSKiiP series offer customers multiple advantages at the system application level:
Simplified System Integration: Integrating rectification, inversion, braking, driving, and protection functions into one unit reduces the number of system components and lowers design complexity . The integrated digital driver provides safe isolation for both switching signals and parameter measurement, further reducing design complexity .
High Power Density: The baseplate-less design and optimized thermal management allow for higher power output in a smaller volume, enabling customers to design converters with higher power ratings using the same or less space .
Reduced Manufacturing Costs: The spring contact design eliminates complex soldering procedures, making module assembly faster and simpler (typically requiring only one or two screws for fixation) . In some applications, this design can lead to a reduction in inverter package and manufacturing costs of up to 15% .
10. SKiiP 26NAB065V1 Manufacturer
The SKiiP 26NAB065V1 and its MiniSKiiP series were originally developed and manufactured by the German company SEMIKRON . SEMIKRON has a long history and deep expertise in the field of power semiconductor modules.
In August 2022, SEMIKRON officially merged with Danfoss Silicon Power, a subsidiary of the Danfoss Group, to form Semikron Danfoss . The purpose of this merger was to combine the more than 90 years of expertise and innovation capabilities of both parties , with a commitment to significant investment in innovation, technology, and capacity . This joint business is dedicated to being the leading partner in power electronics, with a workforce of more than 3,500 dedicated power electronic specialists .
Summary
In summary, the SKiiP 26NAB065V1 IGBT module is not merely a high-performance power semiconductor device; it is a highly engineered smart power solution. With its ultra-high reliability provided by solder-free technology, excellent power density, and simplified system integration, it redefines the standards for the mid-to-low power variable frequency drive market.
FAQ
What is the core advantage of the SKiiP 26NAB065V1?
The primary advantage is its solder-free spring contact technology, which significantly boosts reliability under thermal cycling and simplifies system assembly.
What are the main applications for the 26NAB065V1 module?
It is mainly used in mid-to-low power compact Variable Frequency Drives (VFDs), as well as high-reliability general-purpose inverters for industrial automation like pump and fan control.
What does CIB topology stand for?
CIB stands for Converter-Inverter-Brake. The module integrates the AC rectifier, DC link inverter, and brake chopper into one single package.
What are the nominal current and voltage ratings?
The nominal collector current (ICnom) is 50 A, and it is designed for a 650 V voltage platform.
How is the MiniSKiiP module mounted to the heatsink?
The MiniSKiiP uses a baseplate-less design and spring contacts. The module is secured with just one or two screws, integrating the driver board, module, and heatsink in a single step.
Who is the manufacturer of this module?
The manufacturer is Semikron Danfoss. The company was formed in August 2022 through the merger of Semikron and Danfoss Silicon Power.
What integrated protection features does the module include?
As an Intelligent Power Module (IPM), it integrates comprehensive protection including short-circuit protection (VCE monitoring), over-temperature monitoring (built-in NTC), and DC bus overvoltage protection.
References
MiniSKiiP Dual - Danfoss
SKIIP26NAB065V1 Datasheet
