| Project/Area Number |
25420277
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Power engineering/Power conversion/Electric machinery
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| Research Institution | National Institute of Technology, Kumamoto College |
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Principal Investigator |
OOTA Ichirou 熊本高等専門学校, 情報通信エレクトロニクス工学科, 教授 (60149995)
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| Co-Investigator(Kenkyū-buntansha) |
TERADA Shinya 熊本高等専門学校, 制御情報システム工学科, 准教授 (70455179)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | デジタルアンプ / スイッチトキャパシタ / D-Aコンバータ / D級増幅器 / デジタル電力増幅器 / コイルレス / 小形軽量 / 集積化 |
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| Outline of Final Research Achievements |
A switched capacitor circuit (SCC) converts a voltage to other by changing the connection of capacitors using high speed semiconductor switches. In this study, a new coil-less digital power amplifier was developed using the SCC. In the proposed circuit, each capacitor is charged up to the voltage which is proportional to the weight of each binary digit. The output voltage is obtained by connecting the capacitors which is corresponding digital input signal is high. Therefore, a digital input signal can be converted to an analog power output voltage instantly.
A designed 16-bit digital amplifier has the following feature. The frequency characteristic is flat from DC to 20 kHz, and the power conversion efficiencies at light load and 8Ω load are higher than 99% and 95%, respectively.
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