FUJI 7MBR75VR120-56 IGBT Module

Fuji 7MBR75VR120-56: 7-in-1 IGBT Module Data & Specs

A highly integrated 7-pack PIM designed to accelerate the development of compact, efficient, and thermally stable industrial motor drives.

The Fuji Electric 7MBR75VR120-56 is a 1200V, 75A Power Integrated Module (PIM) from their V-Series, engineered for comprehensive system integration. With a 3-phase converter, a brake chopper, and a 3-phase inverter integrated into a single package, it fundamentally simplifies the bill of materials and assembly process for variable frequency drives. This integration directly addresses the engineering challenge of designing compact power stages by co-packaging the essential components, ensuring predictable performance and thermal behavior right out of the box.

Top Specs: 1200V | 75A (Inverter) | VCE(sat) 2.1V typ. | Tj 150°C max

Key Benefits: Simplified PCB layout. Reduced component count. Integrated thermal monitoring.

Core Electrical and Thermal Specifications

The operational parameters of the 7MBR75VR120-56 are defined to provide a robust foundation for motor drives and other power conversion applications. The specifications detailed below are extracted from the official manufacturer's datasheet, offering engineers a reliable data set for system modeling and performance evaluation. For comprehensive schematics and application notes, please refer to the official 7MBR75VR120-56 datasheet.

Functional Grouping of Parameters (at Tc = 25°C unless otherwise noted)

Deconstructing the 7-in-1 PIM Architecture

The 7MBR75VR120-56's primary value proposition lies in its high level of integration, commonly known as a 7-in-1 or CIB (Converter-Inverter-Brake) module. This architecture consolidates seven key semiconductor devices into a single, thermally optimized package. This includes a three-phase diode bridge for AC-to-DC rectification, a three-phase IGBT bridge for DC-to-AC inversion, and a seventh IGBT with an anti-parallel freewheeling diode for the dynamic braking circuit. What is the benefit of an integrated NTC thermistor? It provides direct, real-time feedback on the module's baseplate temperature, eliminating the need for external sensors and simplifying the implementation of over-temperature protection.

This level of integration offers several engineering advantages:

• Reduced Parasitic Inductance: The internal layout is optimized to minimize stray inductance between components, which is critical for reducing voltage overshoots during high-speed switching events. This leads to cleaner switching waveforms and improved EMI performance.
• Simplified Thermal Design: All major heat-generating components are mounted on a single isolated copper baseplate. This simplifies the heatsink design, as engineers only need to manage a single thermal interface. The integrated NTC thermistor is crucial here; it acts like the module's internal fever thermometer, giving the control system a direct reading of the thermal state to prevent overheating. For further reading, explore how effective thermal management is crucial for long-term IGBT reliability.
• Guaranteed Component Matching: The characteristics of the IGBTs and diodes within the module are inherently matched during manufacturing, ensuring balanced current sharing and predictable performance across the three phases of the inverter.

Data-Driven Evaluation: 7MBR75VR120-56 in Context

When evaluating a PIM like the 7MBR75VR120-56, it's essential to compare its specifications against alternatives to understand its specific fit. The following provides a factual comparison to support your engineering assessment. This information is intended to empower decision-making, not to recommend one component over another.

Comparative Table:

For systems up to approximately 30 kW requiring an integrated brake chopper and rectifier, the 7MBR75VR120-56 presents a compelling case for design simplification. The primary trade-off is often between the all-in-one convenience of a PIM and the design flexibility offered by discrete or less integrated modules. For applications demanding higher power density or specialized topologies, exploring other options, such as the 7MBR150VR120 which offers a higher 150A current rating in a similar package, may be a relevant step in the design process.

Strategic Impact on Compact Industrial Drives

The trend in industrial automation is toward smaller, more distributed motor control systems. The 7MBR75VR120-56 directly supports this shift. By integrating the front-end rectifier, brake circuit, and output inverter, this IGBT module enables a significant reduction in the overall drive footprint. This is particularly valuable in applications like conveyor systems, packaging machinery, and robotics, where cabinet space is at a premium. The reduced component count also streamlines manufacturing and supply chain logistics, contributing to a lower total cost of ownership (TCO). This aligns with the broader move towards modular and scalable designs in modern industrial equipment.

Field-Proven Integration Examples

The architecture of the 7MBR75VR120-56 is well-suited for deployment in a variety of industrial power conversion systems. Its 7-in-1 configuration is particularly effective in compact Variable Frequency Drives (VFDs) where space and assembly cost are critical design constraints. In a typical VFD, this single module replaces a separate rectifier module, a brake chopper module, and a three-phase inverter module, drastically reducing wiring complexity and potential points of failure. The result is a cleaner internal layout, improved manufacturability, and enhanced reliability due to the optimized and validated internal connections.

Empowering Compact and Reliable Power Systems

The utility of the 7MBR75VR120-56 extends across a range of applications where medium-power three-phase control is essential. Its integrated nature makes it a strong candidate for systems where time-to-market and reliability are paramount.

• Small to Medium Industrial Motor Drives: An ideal power core for VFDs controlling AC induction motors in the 15 kW to 30 kW range, commonly found in pumps, fans, compressors, and machine tools.
• Servo Drives: The module's performance is suitable for the power stages of servo drives used in factory automation and robotics, providing precise control of motion. For more on this, see our article on IGBTs in robotic servo drives.
• General Purpose Inverters & UPS: The all-in-one design simplifies the construction of power conversion systems for uninterruptible power supplies (UPS) and other general-purpose inverter applications.

What is the best fit for the 7MBR75VR120-56? For VFDs under 30 kW where design cycle time, reduced assembly complexity, and built-in thermal feedback are prioritized, its integrated 7-in-1 architecture is an optimal choice.

Frequently Asked Questions (FAQ)

1. What is the primary difference between the 7MBR75VR120-56 and the 7MBR75VR120-50?
The "-56" suffix typically denotes a specific revision or version within the same product family as the "-50". While the core electrical and thermal specifications like voltage (1200V) and current (75A) are identical according to the base datasheet, the "-56" may feature updated internal chipsets (e.g., a newer IGBT generation), minor package modifications, or updated compliance certifications (e.g., RoHS). It is crucial to verify the exact revision details for a specific application, but they are generally considered functionally interchangeable for initial design evaluation.

2. How does the integrated brake chopper in the 7MBR75VR120-56 benefit a motor drive system?
The integrated brake chopper is essential for applications involving rapid deceleration or overhauling loads, where the motor acts as a generator. This regenerative energy flows back to the DC bus, causing its voltage to rise. The brake chopper provides a controlled path to dissipate this excess energy through an external braking resistor, protecting the inverter from overvoltage faults and ensuring safe, controlled stopping.

3. What are the key considerations for the gate drive circuit for this module?
A proper gate drive design is critical for ensuring reliable switching and protecting the IGBTs. Key considerations include: providing the recommended gate-emitter voltage (typically +15V for turn-on, -8V to -15V for turn-off) to ensure full enhancement and prevent parasitic turn-on; ensuring sufficient peak gate current to charge and discharge the gate capacitance quickly for efficient switching; and implementing protection features like short-circuit detection (desaturation detection) and under-voltage lockout (UVLO).

For further inquiries or to evaluate this module for your specific design, please contact our technical support team for assistance with documentation and component data.