Technical Information Site of Power Supply Design

Product Key Points

RGTV/RGW Series of 650 V IGBTs: Combining Industry-Leading Efficiency and Soft Switching

Low Conduction Losses, Fast Switching = High Efficiency;
Greatly Reduced Overshoot = Fewer Suppression Components

  • RGTV series
  • RGW series
  • Low conduction loss (VCE(sat)=1.5V)
  • Fast switching (tf = 30-40ns)
  • Tradeoff relationship
  • Thin wafer technology
  • ROHM’s unique structure with refined cell design
  • Interleaved PFC circuit
  • Soft switching
  • Reduce by 50% voltage overshoot
  • Eliminate snubber circuits and other components
  • Improvements in safety and reliability
  • Gate resistance
  • Switching losses increase

ROHM has recently developed a total of 21 models of the RGTV series (short-circuit tolerance type) and RGW series (fast switching type) of 650 V IGBTs, which combine industry-leading low conduction losses and fast switching, and feature greatly reduced overshoot during switching.

Amidst mounting demands for energy efficiency, there has been a tendency toward increasing actual power consumption in systems, and further efficiency improvements are being sought. Moreover, in high power applications using IGBTs, measures to address overshoot during switching, which can cause device faults and equipment malfunctions, are essential to secure equipment reliability. The new series of devices were developed in response to these issues.

Combining Industry-Leading Low Conduction Losses and Fast Switching to Improve Efficiency

The new series achieve industry-leading low conduction losses (VCE (sat) = 1.5 V) and fast switching (tf = 30 to 40 ns). There is a tradeoff relationship between these two characteristics, but by exploiting thin wafer technology, the wafer thickness was reduced by 15% compared with previous devices, and through the use of ROHM’s unique structure with a refined cell design, it was possible to achieve both. The following comparative graph indicates that the RGW series achieves a low switching loss of approximately 800 μJ, even while maintaining a low conduction loss of VCE (sat) = 1.5 V.

Through these improvements to characteristics, in examples of use in an interleaved PFC circuit, efficiency was raised 1.2% under light loading and 0.3% under heavy loading, compared with conventional products.

Fewer Overshoot Suppression Components through Soft Switching

Through optimization of the overall design to realize soft switching, it was possible to reduce by 50% the voltage overshoot that occurs during switching, compared with existing devices of comparable efficiency. As a result, snubber circuits and other components that normally were necessary for overshoot suppression can be eliminated. At the same time, damage, malfunctions and the like are also alleviated, for improvements in equipment safety and reliability.

The following is a comparison of switching overshoot. One method of reducing overshoot is to adjust the value of the gate resistance. In general, overshoot tends to diminish when the gate resistance is increased, but the switching speed declines and switching losses increase. In a comparison of devices with a gate resistance of 10 Ω, the new ROHM product series exhibited half or less of the overshoot of standard products, and convergence was also highly satisfactory. Even when the gate resistance of standard products was increased more than threefold to 33 Ω, the remaining overshoot was still greater than that for the new ROHM products.

Applications and Product Lineup

The current product lineup includes two series: the RGTV series, which features a short-circuit withstand time of 2 μs, and the RGW series, which features fast switching, for a total of 21 models (with one model in development). These products are suitable for use in UPS (uninterruptible power supply) devices, welders, power conditioners and other industrial equipment, as well as general-use inverters, converters, and other power conversion equipment for consumer goods such as air conditioners and IH (inductive heating) products.

RGTV Series (Short-Circuit Tolerance Type)

  TO-247N TO-3PFM
IGBT only With built-in FRD IGBT only With built-in FRD
80A RGTVX6TS65 ★ RGTVX6TS65D    

★ Under development

RGW Series (Fast Switching Type)

  TO-247N TO-3PFM
IGBT only With built-in FRD IGBT only With built-in FRD

Power Supply Design Technical Materials Free Download

Power Supply Design Technical Materials Free Download

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