reduction in total IGBT loss, compared with the S-
series. For U-series IGBT modules, in which on-state
energy loss has been decreased due to a reduction of
VCE (sat), an additional 10 % reduction of loss has been
realized.
achieved. These improvements led to the realization of
an FWD having low generated loss and low noise, and
enabled its application to the U-series module.
5. Introduction of Product Series
4. Improvement of FWD
Details of the U-series IGBT product lineup are as
follows.
The U-series IGBT product lineup and
An FWD is packed into an IGBT module together
with an IGBT, and the FWD is required to have soft
recovery characteristics and reduced levels of generat-
ed loss. The improvements include optimization of
wafer specifications, injection control from the anode at
the chip’s front structure and implementation of
optimal lifetime control. Fuji Electric has developed
FWDs with a revised new design. The output charac-
teristics are shown in Fig. 9. As a result, the forward
voltage (VF) has been reduced and positive tempera-
ture dependance have been realized. Because carrier
injection is suppressed, the peak current at reverse
recovery has been reduced, loss generation has been
reduced, and soft-recovery characteristics have been
product release date are shown in Table 1, and the
external view of a typical package is shown in Fig. 10.
The major ratings and characteristics of U-series
IGBTs are shown in Table 2.
6. Conclusion
The T-series and U-series of IGBTs for 600 V-NPT
modules were introduced. Fuji Electric will continue to
advance the high performance of these modules by
developing specific technology for IGBTs and by incor-
porating technologies of other types of semiconductors,
and will strive to contribute to the overall development
of power electronics.
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Vol. 48 No. 4 FUJI ELECTRIC REVIEW