著者

小島 立寛 和田 圭二 五箇 繁善

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.142, no.8, pp.647-648, 2022-08-01 (Released:2022-08-01)

参考文献数

5

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This paper proposes that wireless time synchronization by GNSS (Global Navigation Satellite System) can be applied to the control of power conversion circuits, and clarifies its validity through experiments. This paper shows that a highly accurate synchronization can be obtained by employing a synchronization system based on GNSS. Moreover, the control signals of each power device in a half-bridge inverter are connected to a controller with GNSS and driven using 10kHz switching, which enables operation of the power conversion circuit without causing a leg short circuit.

著者

徳山 寛 和田 圭二 五箇 繁善

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.4, pp.324-329, 2021-04-01 (Released:2021-04-01)

参考文献数

21

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In power converter circuits, a gate drive circuit is connected to the power devices for the switching operation. The gate drive circuit transmits both signal and power to the power devices, simultaneously. At present, multi-level converter circuits using large numbers of devices have been proposed for power electronics circuits, but these are complicated to implement in a circuit. Hence, simplification of the signal and power transmissions of the gate drive circuit is required for circuit implementations. This paper proposes a gate drive circuit using SAW (Surface Acoustic Wave) devices that can transmit signal and power to the power devices, simultaneously. To use the several-hundreds MHz signal output from the SAW filter as the gate signal, this paper presents the design procedure for the internal parameters of the detection circuit that demodulates the signal into a several kHz signal. The usefulness of the proposed design is demonstrated by experimental evaluation of a half-bridge inverter and gate drive circuit with SAW filters.

著者

渡部 泰明 佐藤 裕貴 五箇 繁善 佐藤 隆幸 関本 仁

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.127, no.8, pp.1192-1193, 2007-08-01 (Released:2007-09-01)

参考文献数

3

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To improve the temperature characteristics of SC-cut oscillators without degrading their phase noise and short term stabilities, an oscillator circuit has been designed. This circuit uses an AT-cut resonator as a temperature reference of the output frequency, that is, the oscillation frequency of the SC-cut circuit traces the temperature characteristics of the AT-cut resonator. Experimental results show that the frequency stability for the temperature is improved 30 times better than normal oscillators.

著者

渡部 泰明 小峰 清香 五箇 繁善 佐藤 隆幸 関本 仁 内田 剛

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.125, no.8, pp.1179-1184, 2005 (Released:2005-11-01)

参考文献数

8

被引用文献数

2 2

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This paper describes an analysis of the close to carrier phase-noise characteristics of the narrow-band Colpitts oscillators. The open-loop impedance, that is, series of the SC-cut resonator and the oscillator active circuit, is calculated using a linear circuit model with a non-linear transistor model. It is shown that the loaded Q can be improved by introducing the resonator filter in the oscillation circuit. Based on the Leeson's model, the near carrier phase-noise is estimated using the calculated Q values. The results corresponded well with the previous experiments. It is also shown that the phase-noise can be exceedingly improved, that is, under -148 dBc/Hz at 10Hz offset, by using resonator filter with high Q.