Fuji 7MBR20SG060-60: An Integrated Power Module for Compact Motor Drives
Fuji 7MBR20SG060-60 IGBT: 600V 20A 7-in-1 PIM Module
Integrated Power Stage for Compact Motor Drives
The Fuji Electric 7MBR20SG060-60 is a Power Integrated Module (PIM) that consolidates a complete three-phase inverter, brake chopper, and a converter diode bridge into a single, compact package. This high level of integration provides an efficient foundation for developing low-power motor drives by minimizing component count and simplifying thermal management. It leverages Fuji Electric’s trench gate IGBT technology to achieve a balance between conduction and switching losses.
- Core Specifications: 600V | 20A | VCE(sat) (typ) 1.90V
- Key Advantages: Reduces PCB complexity, improves thermal efficiency.
- Integrated Topology: Features a 7-in-1 configuration with an NTC thermistor for temperature monitoring.
For detailed electrical and thermal characteristics, download the official datasheet (PDF).
Technical Analysis for System Design
The primary value of the 7MBR20SG060-60 lies in its functional integration. By housing the inverter, brake, and converter stages in one module, designers can significantly reduce the physical footprint of the power electronics. This integration also minimizes stray inductance between stages, a critical factor in reducing voltage overshoots and electromagnetic interference (EMI). The result is a more reliable and compact system that can be brought to market faster. Explore related topics like the PIM vs. discrete IGBT trade-offs for further context.
A key parameter for reliability is the thermal resistance from junction to case (Rth(j-c)). For the inverter IGBTs in this module, the specified value is 1.25 °C/W per device. Think of thermal resistance as the width of a pipe for heat to escape; a lower value signifies a wider pipe, allowing heat to flow away from the sensitive silicon junction more effectively. This efficient heat dissipation, combined with the integrated NTC thermistor, enables precise thermal management and helps prevent overheating, a common cause of IGBT failures.
Optimized Application Scenarios
The module’s characteristics make it a strong candidate for several applications:
- Small AC Motor Drives: Its all-in-one CIB (Converter-Inverter-Brake) topology is ideal for variable frequency drives (VFDs) powering motors up to approximately 2.2 kW. The integrated brake chopper simplifies the management of regenerative energy.
- AC and DC Servo Drives: The compact footprint and low internal inductance contribute to the precise and reliable control required in robotics and CNC machinery.
- Uninterruptible Power Supplies (UPS): Serves as a robust core for the DC-AC inverter stage in smaller-scale UPS systems, where reliability is critical.
- HVAC Systems: Provides an efficient power stage for controlling fans, pumps, and compressors, contributing to overall system energy savings.
This module is best matched for power conversion systems requiring a compact, reliable, and thermally efficient solution for 200-240V AC input applications.
Key Specifications of the 7MBR20SG060-60
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Absolute Maximum Ratings (Tc=25°C) | |||
| Collector-Emitter Voltage (Inverter & Brake) | VCES | 600 | V |
| Collector Current (Inverter, Continuous, Tc=100°C) | Ic | 20 | A |
| Collector Power Dissipation (Inverter, 1 device) | Pc | 100 | W |
| Electrical Characteristics (Inverter Part, Tj=25°C) | |||
| Collector-Emitter Saturation Voltage (Ic=20A, VGE=15V) | VCE(sat) | 1.90 (typ) / 2.30 (max) | V |
| Turn-on Switching Loss (Vcc=300V, Ic=20A) | Eon | 1.30 (typ) | mJ |
| Turn-off Switching Loss (Vcc=300V, Ic=20A) | Eoff | 1.70 (typ) | mJ |
| FWD Forward Voltage (If=20A) | VF | 1.95 (typ) / 2.35 (max) | V |
Engineer’s FAQ
What are the primary advantages of a 7-in-1 PIM like the 7MBR20SG060-60?
The main benefits are system simplification and improved reliability. Integrating the input rectifier, output inverter, and brake chopper into one module reduces component count, simplifies PCB layout, lowers assembly costs, and minimizes parasitic inductance, leading to better electrical performance and reduced EMI.
How does the integrated NTC thermistor enhance system protection?
The built-in NTC thermistor provides a direct, real-time measurement of the module’s substrate temperature. A gate driver or system controller can monitor this feedback to detect overheating conditions. This allows for implementing protective measures like reducing the switching frequency or initiating a controlled shutdown, which is crucial for preventing thermal runaway. Learn more about the role of the integrated NTC for IGBT safety.
What considerations are important when mounting this module?
Proper mounting is critical for effective thermal management. Ensure the heatsink surface is flat and clean. Apply a thin, uniform layer of thermal grease to minimize the contact thermal resistance. Use M4 screws and apply the recommended torque of 1.3 – 1.7 Nm to ensure good thermal contact without inducing mechanical stress on the module’s substrate.
Is this module suitable for high-frequency switching applications?
The 7MBR20SG060-60 utilizes trench gate field-stop technology, which is a compromise between low VCE(sat) and switching speed. While suitable for typical motor drive frequencies (up to ~15-20 kHz), engineers should carefully analyze the switching losses (Eon and Eoff) from the datasheet to calculate total power dissipation at their target operating frequency to ensure it remains within thermal limits.
Enabling Efficient Power Conversion
The Fuji Electric 7MBR20SG060-60 provides a technically sound and highly integrated solution for power system design. Its all-in-one architecture directly addresses the engineering goals of reducing system size, simplifying assembly, and improving thermal performance. This module empowers designers to create more compact, cost-effective, and reliable low-power motor control systems and inverters.