著者

菅 郁朗 木全 政弘 打田 良平

出版者

The Institute of Electrical Engineers of Japan

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.116, no.4, pp.420-426, 1996-03-20 (Released:2008-12-19)

参考文献数

8

被引用文献数

6 14

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Recent increase of semiconductor power converter systems brings about harmonic problems. In a single phase power converter, a capacitor-filtered rectifier is used to derive DC voltage from an AC commercial power source. This converter generates harmonic currents and its power factor is very low. In order to reduce harmonic currents and compensate the input power factor, we propose a novel switching method, called the simple partial switching method (SPSM), for a single phase AC to DC converter. A control device of the converter switches once in every half cycle of an AC commercial power source by this SPSM. The switching timing is decided by the input power factor and by the odd order harmonic estimation function of the input current. The estimation function is defined as the harmonics ratio compared with the harmonic currents standard. Experimental results clarify that our SPSM converter reduces harmonic currents and compensates the input power factor.

著者

酒井 拓也 竹下 みゆき 菅 郁朗

出版者

パワーエレクトロニクス学会

雑誌

パワーエレクトロニクス学会誌 (ISSN:13488538)

巻号頁・発行日

vol.35, pp.184-190, 2010-04-01 (Released:2011-02-25)

参考文献数

8

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We have developed the new low-loss rectification circuit that needs neither external signals nor power sources for driving. This circuit creates the control power source for the circuit operation from reverse voltage. The direction of the current that flows in this circuit is detected from the voltage between the MOSFET's drain and source. The current is rectified by driving MOSFETs using this detection result. Also, the circuit has several types of MOSFETs connected in parallel. Types and numbers of MOSFETs are automatically selected to minimize the loss according to the magnitude of the current detected from the voltage between the MOSFET's drain and source. To create the power source and the signal for the rectification circuit, the circuit needs no inputs from outside like a diode. Therefore, this circuit can be easily substituted for a conventional diode. In operation tests, the minimum forward voltage drop was 0.04 [V] when the current was rectified. As a result, the forward voltage drop was less than 1/10 compared to conventional diodes, and the loss could be decreased extremely. Therefore, the miniaturization of the electric equipment that is radiation fin and fan becomes possible, too. The low-loss rectification circuit can save energies by substituting diodes for prevention of global warming.