| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2018: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
|
|---|
| Outline of Final Research Achievements |
Two types of switching assist circuits were applied to a buck chopper, a bidirectional buck boost chopper and an inverter. Some prototypes were developed, and it has been confirmed that the "load shorting type" can retrieve energy stored in the parasitic output capacitor of the main switching device and can transfer it to the load, resulting in total efficiency improvement. It has also been confirmed the “gate drive circuit add-on type” can achieve fast charge of the parasitic capacitor, which is effective to avoid short circuit through the capacitor due to the complementary switching action and to improve the overall efficiency. 2-4 % efficiency improvement has been achieved for the bidirectional buck boost chopper, and 6 % improvement for the inverter in a light load range.
|
