成果報告書詳細
管理番号20160000000807
タイトル*平成27年度中間年報 低炭素社会を実現する次世代パワーエレクトロニクスプロジェクト 次世代パワーエレクトロニクス応用システム開発の先導研究 小型高効率GaN発振器を用いたUVーC発生装置の研究開発(1)
公開日2016/9/7
報告書年度2015 - 2015
委託先名東京計器株式会社
プロジェクト番号P10022
部署名IoT推進部
和文要約
英文要約Title: The next-generation power electronics project for realizing a low-carbon society. Leading research of next-generation power electronics application systems developments. Feasibility Study on Research and development of UV-C generators using compact, high-efficiency GaN oscillators (FY2015-FY2016) FY2015 Annual Report

Microwave oscillators comprising GaN amplifiers are developed. They are used as power sources of UV-C generators. The oscillator has a coupler that extracts a part of the output of the power amplifier. Then the extracted power is fed back to the amplifier input via a resonator and a phase line.
 In order to realize small size and low power consumption, amplifier miniaturization and high efficiency are essential. To achieve these characteristics, the amplifier comprises a bare die GaN-HEMT and matching circuits in a package. The oscillator includes a driver amplifier and a power amplifier to achieve the sufficient gain.
The driver amplifier comprises a 40W GaN-HEMT and the final amplifier comprises a 120W or a 170W GaN-HEMT. They are packed into a 20mm x 30mm package respectively and matched with 50Ω.
During the measurement, wires forming the harmonic termination circuit have been fused. In general wires are commonly utilized as inductance elements. But at the high frequency range there exists a skin effect, so at 2450MHz the maximum allowable current for a gold wire reduces to one fourth compared with that of D.C. In addition, the resistance of the wire increased due to longer length so wire fusing happened. Removing the fused wires and introducing gold ribbons in the circuit, performance tuning was done. The measurement results in 70% efficiency with a saturated output power.
It was found that the efficiency is improved by applying higher drain voltage. But the peak value of the voltage waveform approaches the maximum, it is necessary to verify the reliability.
Using the designed amplifier data, the performance of the oscillator was estimated. As a result, 69% efficiency was obtained with the output power of 120W. The dimension of oscillator circuit will be about 90mmx55mm.
Since the designed amplifiers have the issue of wire fusing and reliability, it is planned to re-design the circuit configuration at the next trial to improve the problems.
Based on the present discussion, it will be expanded to the circuit configuration of the oscillator. And the construction and structure of the peripheral circuit will be modified for the power source of UV-C generators.
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