Fuji Electric 7MBR50SB120-55 | Compact PIM for High-Density Power Conversion
The Fuji Electric 7MBR50SB120-55 is a highly integrated Power Integrated Module (PIM) from the S-Series, engineered for designers of compact and efficient power conversion systems. This 1200V, 50A IGBT module consolidates a three-phase converter bridge, a three-phase inverter, and a brake circuit into a single, board-mountable package. This level of integration simplifies circuit design, reduces component count, and minimizes overall system footprint, making it an ideal solution for applications where space and assembly efficiency are critical design constraints. The 7MBR50SB120-55 is particularly well-suited for low- to medium-power motor drives, servo amplifiers, and uninterruptible power supplies (UPS).
Technical Deep Dive: Integration and Performance
The core value of the Fuji Electric 7MBR50SB120-55 lies in its intelligent integration and the performance of its constituent components. By combining multiple power stages into one module, it addresses several engineering challenges simultaneously.
- Seven-in-One PIM Topology: This module incorporates a full three-phase input rectifier, a seven-switch inverter bridge (including the brake chopper), and a freewheeling diode for each IGBT. This comprehensive integration, a hallmark of Fuji Electric PIMs, drastically reduces the need for external power components, simplifies PCB layout, and mitigates parasitic inductance, which can be a significant source of EMI and voltage overshoot in high-frequency applications.
- Optimized Low VCE(sat): The module utilizes Fuji's S-Series IGBT technology, which is engineered to minimize collector-emitter saturation voltage (VCE(sat)). A low VCE(sat) of typically 2.3V at the rated current directly translates to lower conduction losses during operation. This reduction in wasted heat improves overall system efficiency and simplifies thermal management, potentially allowing for smaller heatsinks and a more compact final product.
- Integrated Brake Circuit: The inclusion of an IGBT and freewheeling diode for dynamic braking is a critical feature for motor control applications. It provides a built-in mechanism to dissipate regenerative energy from the motor during deceleration, ensuring controlled and safe stopping without requiring an external braking unit. This further enhances the space-saving and cost-effective nature of the 7MBR50SB120-55.
Application Scenarios and Engineering Advantages
The unique feature set of the 7MBR50SB120-55 provides tangible benefits across several demanding applications:
- AC and DC Servo Drives: In precision motion control, rapid acceleration and deceleration are paramount. The integrated brake chopper handles regenerative energy efficiently, while the low-loss IGBTs ensure that the drive operates with high efficiency and minimal heat generation, critical for maintaining accuracy in enclosed systems. For more on this topic, explore our guide to the role of IGBTs in robotic servo drives.
- Compact Variable Frequency Drives (VFDs): For general-purpose motor drives up to approximately 22kW, the PIM architecture is a game-changer. It enables the design of smaller, more cost-effective VFDs by reducing assembly time and PCB complexity. The robust 1200V rating provides a significant safety margin for operation on 400/480VAC lines.
- Uninterruptible Power Supplies (UPS): System reliability and efficiency are the primary metrics for UPS design. The high level of integration within the 7MBR50SB120-55 inherently increases reliability by reducing the number of solder joints and potential points of failure. Its efficient operation minimizes energy loss, contributing to a lower total cost of ownership.
Key Parameters of the 7MBR50SB120-55
The following table provides a summary of the critical electrical and thermal characteristics for design engineers. For a complete overview, you can download the official datasheet.
| Parameter | Value |
|---|---|
| Max Collector-Emitter Voltage (Vces) | 1200V |
| Continuous Collector Current (Ic) @ Tc=80°C | 50A (Inverter Stage) |
| Collector-Emitter Saturation Voltage (VCE(sat)) @ Ic=50A | 2.3V (Typ.) / 2.7V (Max.) |
| Max Operating Junction Temperature (Tj) | 150°C |
| Isolation Voltage (Visol) | 2500V (AC, 1 minute) |
| Package | PIM, Board Mount |
Selection Guidance: PIM vs. Discrete Solutions
Choosing between an integrated module like the 7MBR50SB120-55 and a design using discrete IGBTs and diodes involves a trade-off between integration and design flexibility. While a PIM simplifies the design and manufacturing process, a discrete solution might be preferred for highly specialized applications with unique thermal or layout requirements.
The Fuji Electric 7MBR50SB120-55 is the optimal choice for projects where speed to market, reduced assembly cost, and a compact footprint are the primary drivers. In contrast, a six-pack module such as the BSM50GP60 might be considered if the front-end rectifier and brake circuit need to be custom-designed or are located separately in the system architecture. For a deeper analysis of this trade-off, our article on IPM vs. Discrete IGBTs provides valuable insights.
For inquiries regarding pricing, availability, or technical support for the 7MBR50SB120-55 and other IGBT modules, please do not hesitate to contact our technical team.
