Fuji Electric 7MBI40N-120 | Robust 1200V/40A PIM for Reliable Motor Drives
The Fuji Electric 7MBI40N-120 is a workhorse Power Integrated Module (PIM) engineered for durability and efficiency in demanding power conversion applications. By integrating a three-phase inverter, a brake chopper, and rectifier diodes into a single, compact M-Pack package, this module provides a streamlined solution for engineers designing systems where reliability and simplified assembly are paramount.
- Integrated 7-in-1 Configuration: Features a full three-phase inverter bridge and a brake unit, significantly reducing component count, assembly complexity, and stray inductance on the PCB.
- Robust Electrical Ratings: With a 1200V collector-emitter voltage (Vces) and a 40A continuous collector current (Ic), it is ideally suited for 380-480V AC line-powered systems.
- Proven NPT Technology: Utilizes Non-Punch-Through (NPT) IGBT technology, known for its ruggedness, excellent short-circuit withstand capability, and positive temperature coefficient for stable operation.
- Optimized for Low-Frequency Operation: Engineered to minimize conduction losses, making it highly efficient in applications like motor control and UPS systems that operate at lower switching frequencies.
Key Technical Specifications
The following parameters are critical for system design and thermal analysis. For complete specifications, please download the official 7MBI40N-120 datasheet.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (VCES) | 1200 V |
| Continuous Collector Current (IC) @ TC=80°C | 40 A |
| Collector-Emitter Saturation Voltage (VCE(sat)) (Typ. @ IC=40A) | 2.7 V |
| Short Circuit Withstand Time (tsc) | ≥ 10 µs (VCC=600V, VGE=15V, Tj=125°C) |
| Thermal Resistance, Junction to Case (Rth(j-c)) per IGBT | 0.70 °C/W |
| Package Type | M-Pack (7-in-1) |
Application Scenarios & Engineering Value
The Fuji Electric 7MBI40N-120 is not just a component; it's a system-level solution. Its design directly addresses common engineering challenges in several key applications.
- AC Motor Drives: In Variable Frequency Drives (VFDs) up to 15 kW, the PIM architecture dramatically simplifies the power stage. Integrating the rectifier, inverter, and brake chopper reduces busbar complexity and potential EMI radiation points, leading to a faster design cycle and a more compact, reliable end product.
- Servo Amplifiers: The module's robust Safe Operating Area (SOA) and reliable short-circuit protection are critical for powering precision in robotic servo drives. The integrated brake unit efficiently handles regenerative energy during rapid deceleration, protecting the DC link capacitors and ensuring system stability.
- Uninterruptible Power Supplies (UPS): For small to medium commercial UPS systems, reliability is non-negotiable. The 7MBI40N-120's proven NPT silicon and robust package construction provide the long-term operational life required, while the integrated design aids in efficient thermal management within space-constrained enclosures.
Technical Deep Dive: The PIM Advantage
The core value of the 7MBI40N-120 lies in its PIM (Power Integrated Module) design. By co-packaging seven semiconductor devices (six for the inverter, one for the brake chopper) that are thermally and electrically matched, Fuji Electric delivers significant engineering benefits over discrete solutions.
Firstly, the internal layout is optimized to minimize stray inductance. This is crucial for reducing voltage overshoots during high-di/dt switching events, which in turn lowers the stress on the IGBTs and simplifies the requirements for snubber circuits. Secondly, the centralized thermal path to a single heatsink simplifies the mechanical design and ensures more uniform temperature distribution across the power devices. This holistic approach is a cornerstone of creating high-efficiency power systems with enhanced reliability.
Frequently Asked Questions (FAQ)
Is the 7MBI40N-120 suitable for high-frequency applications like welding or induction heating?
While extremely robust, the 7MBI40N-120 is optimized for low to medium switching frequencies (typically below 15 kHz). Its NPT technology and relatively high VCE(sat) prioritize low conduction losses over switching performance. For applications requiring higher frequencies (>20 kHz), designers should consider IGBT modules based on modern Trench-Gate Field-Stop (TFS) technology, which offer lower switching losses (Eon/Eoff) at the cost of slightly higher conduction losses.
What is the primary benefit of the integrated brake chopper?
The integrated brake chopper provides a simple and cost-effective method for managing regenerative energy. In motor drive applications, when a motor decelerates, it acts as a generator, feeding energy back into the DC link. This can cause the DC bus voltage to rise to dangerous levels. The brake chopper, in conjunction with an external braking resistor, activates to dissipate this excess energy as heat, protecting the module and other DC link components from overvoltage damage.
For expert guidance on selecting the right power module for your specific design constraints, please contact our technical team for a detailed consultation.
