Technical Analysis of the Mitsubishi CM900HC-90H High-Power IGBT Module
Mitsubishi CM900HC–90H 4500V 900A IGBT Module
Introduction to the CM900HC-90H High Power Module
The Mitsubishi CM900HC-90H is a high power switching, insulated IGBT module engineered for extreme performance in demanding power conversion systems. Its unique value is the combination of an exceptionally high voltage rating with substantial current handling, providing a robust foundation for next-generation medium-voltage applications. This module allows engineers to manage significant power levels with a single, reliable component.
- Core Specifications: 4500V | 900A | 10200Vrms Isolation
- Key Advantages: Facilitates simplified medium-voltage system design, offers superior electrical isolation for operational safety.
- Design Consideration: The low thermal resistance is a critical parameter for developing an effective thermal management strategy to ensure long-term reliability.
Download the Official CM900HC-90H Datasheet (PDF)
Technical Analysis for System Integration
The standout characteristic of the CM900HC-90H is its 4500V collector-emitter voltage (VCES) rating. This specification enables its use in systems connected to medium-voltage grids, often eliminating the need for complex series-connected device topologies. Paired with a continuous collector current (IC) rating of 900A, this module is built to handle immense power throughput. This high voltage capability is supported by a robust internal structure, ensuring stable operation under the high electrical fields inherent in such applications.
Effective thermal management is crucial for reliability in high-current modules. The CM900HC-90H specifies a maximum thermal resistance from junction to case (Rth(j-c)) of 0.011 °C/W for the IGBT. This value can be thought of as the width of a highway for heat; a lower number signifies a wider, less restrictive path for thermal energy to travel from the active silicon to the heatsink. This efficient heat dissipation is essential for maintaining the junction temperature within its operational limit of 125°C, especially during high-load conditions found in high-frequency inverters.
Another critical parameter for safety and system robustness is the isolation voltage (Viso), rated at 10200Vrms for one minute. This high isolation barrier between the current-carrying terminals and the mounting baseplate is fundamental for protecting control electronics and personnel in high-potential environments. It confirms the module’s suitability for applications where high voltage differences are a constant operational reality, contributing to overall system integrity and compliance with safety standards.
Optimized Application Scenarios
The specifications of the CM900HC-90H align it with specific high-power industrial and transportation sectors:
- Traction Control: The 4500V rating is well-suited for main inverters in electric railway and heavy-duty vehicles, providing the necessary voltage headroom for high-voltage DC links.
- Medium Voltage Drives (MVDs): Its ability to block 4.5kV simplifies the architecture of MVDs used for large industrial motors, pumps, and fans.
- Power Transmission & Distribution: Ideal for use in Flexible AC Transmission Systems (FACTS) and HVDC converters, where controlling massive amounts of power is the primary function.
- High-Power Industrial Inverters: Applicable in large-scale renewable energy inverters and industrial power supplies requiring high voltage and current capacity.
This module is best matched for applications where blocking voltages over 3.3kV and high current capabilities are the primary design drivers for the power stage.
Key Specifications of the CM900HC-90H
| Absolute Maximum Ratings (Tj = 25°C unless otherwise noted) | |
|---|---|
| Collector-Emitter Voltage (VCES) | 4500V |
| Collector Current (DC, IC) | 900A |
| Peak Collector Current (ICM) | 1800A |
| Operating Junction Temperature (Tj(op)) | -40 to +125°C |
| Electrical and Thermal Characteristics | |
| Collector-Emitter Saturation Voltage (VCE(sat)) (max, at IC=900A, Tj=125°C) | 5.0V |
| Isolation Voltage (Viso) (AC, 1 min.) | 10200Vrms |
| Thermal Resistance, Junction to Case (Rth(j-c)) (IGBT, max) | 0.011 °C/W |
| Main Terminal Screw | M8 |
Engineer’s Frequently Asked Questions (FAQ)
1. What are the key thermal design considerations for the CM900HC-90H?
Given the 900A rating and a maximum junction temperature of 125°C, effective heat removal is critical. The design must incorporate a high-performance heatsink selected to work with the module’s 0.011 °C/W thermal resistance. Proper mounting torque and the use of a suitable thermal interface material are essential to minimize contact resistance and ensure efficient heat transfer from the module’s baseplate to the cooling system. For detailed calculations, engineers can consult our guide on mastering IGBT thermal design.
2. What is the significance of the 10200Vrms isolation voltage?
The 10.2kVrms isolation rating is a measure of the dielectric strength between the live terminals and the module’s isolated metal baseplate. This high value is crucial for applications in medium-voltage environments, ensuring that high operational voltages do not pose a risk to grounded parts of the system or personnel. It is a key factor in meeting safety certifications like UL and IEC standards.
3. The datasheet specifies a maximum VCE(sat) of 5.0V. How does this impact the design?
A VCE(sat) of 5.0V at 900A and 125°C is characteristic of high-voltage IGBTs. This results in significant conduction losses (P = VCE(sat) * IC), which must be factored into the thermal management design. While higher than low-voltage IGBTs, this is the trade-off for achieving the 4500V blocking capability. Accurate loss modeling is essential for predicting thermal performance. For more on this trade-off, see our analysis of high-voltage IGBTs.
4. What type of gate driver is recommended for this module?
The datasheet specifies a recommended gate-emitter voltage (VGE) of ±20V. A powerful gate driver capable of supplying sufficient peak current is needed to quickly charge and discharge the IGBT’s input capacitance, ensuring efficient switching. The driver should also provide galvanic isolation compatible with the high-voltage environment and incorporate protection features like Under-Voltage Lockout (UVLO). Read more about the role of HVIC gate drivers for reliable control.
Enabling High-Power System Design
The Mitsubishi CM900HC-90H provides the high-voltage blocking and high-current handling capacity necessary for developing robust and simplified power stages in the megawatt class. Its verified isolation and thermal characteristics offer a solid component foundation for engineers designing the next generation of industrial drives, traction systems, and grid-tied converters.