June 15, 2022
KAWASAKI–Toshiba Electronic Devices & Storage Corporation and Toshiba Corporation (collectively “Toshiba”) have together developed the world’s first 4.5-kV double-gate reverse-conducting injection-enhanced gate transistor (RC-IEGT). Toshiba confirmed a total power loss, when switching on and off (switching loss), reduction of 24% compared with the conventional single-gate structure.
Power devices, components that supply and manage power, are essential to reduce power consumption in all kinds of electronic equipment and to achieve a carbon neutral society. In the global trend to decarbonization and energy saving, IEGTs are used in a wide range of applications, such as high power inverters and high-voltage DC power transmission, where they are required to have higher current and efficiency, and lower power losses and consumption. It is difficult to reduce power loss in IEGT, as there is a trade-off whereby reducing the loss when the IEGT is on (conduction loss) increases switching loss.
Toshiba developed a 4.5-kV double-gate RC-IEGT with a hole control gate (CG) separate from the main gate (MG). This approach achieves loss reduction by controlling hole extraction before turn-off and injection compared with reverse recovery in a single device. In IEGT mode, where current flows from the back side to the front side of the substrate, the CG is turned off before the MG at turn-off to reduce the holes accumulated in the substrate and reduce the turn-off loss.In diode mode, where current flows from the front side to the back side of the substrate, by turning on MG and CG at the same time just before reverse recovery, electrons accumulated in the substrate are reduced and reverse recovery loss is reduced.
By combining the newly developed double-gate RC-IEGT and gate control technologies, turn-off and turn-on losses were reduced by 24% and 18%, respectively, and reverse recovery loss was reduced by 32%, against the conventional single-gate structure. As a result, total switching loss was reduced by 24% without any increase in conduction loss in actually measured values.
Details of the achievement were reported at the IEEE International Symposium on Power Semiconductor Devices and ICs (ISPSD) 2022, an international conference held in Vancouver, Canada and online on May 22 to 25.
Toshiba will continue to develop double-gate RC-IEGT and gate control technologies, aiming for commercialization in and beyond 2025. Toshiba is committed to contributing to carbon neutrality through supporting the higher performance of power electronics equipment.
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