## Fuji Electric 7MBR50SB120H-70 | Compact 7-in-1 PIM for High-Reliability Motor Drives
The Fuji Electric 7MBR50SB120H-70 is an expertly engineered Power Integrated Module (PIM) designed to be the robust core of compact, high-efficiency power conversion systems. As a 7-in-1 IGBT module, it integrates a complete three-phase inverter, a brake chopper, and a three-phase rectifier bridge into a single, thermally efficient package. This device is a workhorse solution for engineers developing systems where space, assembly simplicity, and operational reliability are paramount.
- Complete Power Stage Integration: Features a 1200V/50A three-phase inverter, a brake chopper, and a diode converter bridge, drastically reducing component count and system complexity.
- Optimized for Motor Control: Engineered for exceptional performance in low- to mid-frequency applications like variable frequency drives and servo systems.
- Built-in Thermal Monitoring: Includes an integrated NTC thermistor for precise, real-time temperature feedback, enabling advanced thermal protection strategies.
- High Reliability: Leverages Fuji Electric's proven die technology and packaging expertise to ensure long service life in demanding industrial environments.
### Application Scenarios and Value Proposition
The integrated architecture of the Fuji Electric 7MBR50SB120H-70 provides tangible engineering advantages across several key applications.
Variable Frequency Drives (VFDs): For small to medium AC motor applications (e.g., conveyor systems, pumps, fans, and HVAC systems), this PIM is an ideal solution. It consolidates the entire power stage of a Variable Frequency Drive (VFD), simplifying the PCB layout and manufacturing process. The integrated brake chopper is critical for managing regenerative energy during motor deceleration, preventing DC bus overvoltage faults and enhancing system robustness.
Robotics and Servo Drives: In applications powering precision servo drives, space is often at a premium. The 7MBR50SB120H-70 offers a compact power core that minimizes footprint without sacrificing performance. Its low internal inductance design contributes to cleaner switching, which is essential for achieving the smooth motion control required in robotics and CNC machinery.
Uninterruptible Power Supplies (UPS): The module's all-in-one design is highly beneficial for the AC/DC rectifier and DC/AC inverter stages within a double-conversion UPS. Its proven reliability ensures maximum uptime for critical loads, while the simplified thermal design makes building a compact and efficient UPS easier.
### The Engineering Advantage of PIM Architecture
Opting for a Power Integrated Module like the 7MBR50SB120H-70 over a discrete solution offers more than just space savings; it provides fundamental electrical and thermal benefits.
Minimized Parasitic Inductance: By co-packaging the rectifier, brake, and inverter stages on a single insulated substrate, the connection paths between the power devices are drastically shortened. This inherently lowers stray inductance compared to a PCB-based discrete layout. The direct result is reduced voltage overshoot during high-speed switching events, leading to lower component stress, improved EMI performance, and a reduced need for complex snubber circuits.
Superior Thermal Management: All major heat-generating components are mounted on a single, shared baseplate. This creates a centralized thermal source that simplifies heatsink design and ensures thermal consistency across all power stages. Furthermore, the integrated NTC thermistor provides a direct, accurate measurement of the module's operating temperature, a critical input for preventing thermal overload and ensuring long-term reliability.
### Key Technical Parameters
The following table outlines the critical electrical and thermal characteristics of the Fuji Electric 7MBR50SB120H-70. For a comprehensive list of parameters and operating curves, please refer to the official product datasheet.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (VCES) | 1200 V |
| Continuous Collector Current (IC) @ TC=80°C | 50 A |
| Collector-Emitter Saturation Voltage (VCE(sat)) (Typ) @ IC=50A | 2.1 V |
| Total Power Dissipation (PC) @ TC=25°C | 260 W (per IGBT) |
| Maximum Junction Temperature (Tj(max)) | 150 °C |
| Topology | PIM (7-in-1: 3-ph Inverter + Brake + 3-ph Rectifier) |
For complete design specifications, you can download the 7MBR50SB120 series datasheet.
### Frequently Asked Questions (FAQ)
What is the primary function of the integrated brake chopper?
The brake chopper is an essential safety and performance feature in motor drive applications. When a motor decelerates rapidly, it acts as a generator, feeding energy back into the drive's DC bus. This can cause a dangerous rise in DC link voltage. The brake chopper circuit rapidly switches a high-power IGBT to divert this excess energy into an external braking resistor, where it is safely dissipated as heat. This protects the drive from overvoltage faults and allows for controlled, rapid deceleration.
What are the critical considerations for mounting the 7MBR50SB120H-70?
Proper thermal management is key to unlocking the full performance and reliability of this PIM. Three factors are critical: first, ensure the heatsink surface is flat, clean, and provides low thermal resistance. Second, apply a thin, even layer of high-quality thermal interface material (TIM) to eliminate air gaps. Third, use the specified mounting torque to ensure optimal physical contact without inducing mechanical stress on the module's substrate. Always integrate the NTC thermistor's feedback into your controller's firmware to actively monitor and manage the module's temperature.
For detailed application support or to discuss how the Fuji Electric 7MBR50SB120H-70 can fit into your next design, please contact our technical team.
