Fuji 7MBR10SA120-70 | Compact 7-in-1 PIM for Reliable Low-Power Motor Control
The Fuji Electric 7MBR10SA120-70 is a highly integrated Power Integrated Module (PIM) engineered for efficiency and reliability in low-power inverter applications. This 1200V, 10A module consolidates a complete three-phase inverter bridge and a brake chopper circuit into a single, compact package. It is designed as a robust, all-in-one solution that simplifies system design, reduces assembly costs, and enhances the thermal performance of modern power conversion systems.
- 7-in-1 Integration: Combines a 6-pack IGBT bridge, a 1-pack brake chopper, and their respective free-wheeling diodes (FWDs) to minimize board space and parasitic inductance.
- Optimized for Motor Drives: The inclusion of a brake chopper makes it ideal for applications with regenerative braking cycles, such as servo drives and small AC motor controls.
- Enhanced Reliability: Features a built-in NTC thermistor for precise, real-time temperature monitoring, enabling robust over-temperature protection and extending operational life.
- Simplified Thermal Management: All power stages are co-located on a single isolated substrate, ensuring uniform heat distribution and simplifying heatsink design.
Application Scenarios & Engineering Value
The specific topology of the 7MBR10SA120-70 delivers tangible benefits across several key industrial applications. It's not just a component; it's a solution to common engineering challenges in compact power systems.
- Small AC Motor Drives (VFDs): For variable frequency drives controlling motors up to approximately 2.2kW, this module offers a perfect balance of performance and integration. It drastically reduces the complexity of the power stage, leading to faster design cycles and more compact end products.
- Robotic Servo Drives: Precision is paramount in robotics. The integrated brake chopper efficiently dissipates regenerative energy during rapid deceleration, preventing DC bus overvoltage and ensuring stable, repeatable motion control. This is a critical function that is expertly handled within the Fuji IGBTs at the heart of robotic servo drives.
- Uninterruptible Power Supplies (UPS): In space-constrained UPS systems, the module's high level of integration and proven reliability provide the foundation for a robust power backup solution, ensuring uptime for critical equipment.
Key Parameter Overview
The following table outlines the critical electrical and thermal characteristics that define the performance of the 7MBR10SA120-70. For a comprehensive analysis, including characteristic curves and SOA graphs, please refer to the official documentation. You can download the full 7MBR10SA120-70 datasheet for complete specifications.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (VCES) | 1200 V |
| Continuous Collector Current (IC) @ TC=80°C | 10 A |
| Collector-Emitter Saturation Voltage (VCE(sat)) typ. @ IC=10A | 2.5 V |
| Total Power Dissipation (PC) per IGBT | 65 W |
| Maximum Junction Temperature (Tj(max)) | 150 °C |
Technical Deep Dive: The PIM Advantage
The engineering philosophy behind a Power Integrated Module (PIM) like the 7MBR10SA120-70 is centered on optimization. By integrating seven IGBTs and their corresponding FWDs onto a single DBC (Direct Bonded Copper) substrate, Fuji Electric minimizes the stray inductance in the power loop. This is a critical factor in reducing voltage overshoots during high-speed switching events, which in turn improves device reliability and can simplify or even eliminate the need for complex snubber circuits. Furthermore, the built-in NTC thermistor provides a direct feedback path for the system's control logic, allowing for proactive thermal throttling or shutdown before a catastrophic failure can occur. This integrated approach is a cornerstone of preventing the common modes of IGBT failure due to overtemperature.
Frequently Asked Questions (FAQ)
What is the primary benefit of the integrated brake chopper?
The integrated brake chopper provides a controlled path to dissipate regenerative energy. When an electric motor decelerates, it acts as a generator, feeding energy back into the DC bus. Without a brake circuit, this can cause the bus voltage to rise to dangerous levels. The chopper in the 7MBR10SA120-70 safely shunts this energy through an external braking resistor, protecting the drive and other connected components.
Is this module suitable for high-frequency switching applications?
This module is optimized for the switching frequencies typically found in motor drives, which generally range from 2 kHz to 15 kHz. Its VCE(sat) value reflects a design that balances conduction losses (dominant in lower-frequency applications) and switching losses. While it can operate effectively within this range, it is not intended for very high-frequency applications (e.g., >20 kHz) where modules with lower switching losses would be more appropriate.
For assistance with selecting the right IGBT modules for your specific power and frequency requirements, please contact our technical team for an expert consultation.
