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Mutsuyoshi Asano,Hirofumi Matsuo,Haruya Mae,Fujio Kurokawa,Masahiro Sasaki 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper deals with the analysis of the output characteristics of the new digitally controlled dc-dc converter with auxiliary switches, which are used to prevent the extremely lowering of the switching frequency caused by the decrease of the load current and/or the increase of the input voltage. This dc-dc converter with auxiliary switches has two major operation modes; that is, the frequency control and on-time control modes. Taking account of the forward voltage drops and loss resistances of the main switches, auxiliary switches and diodes, and the winding series resistances of the transformer, the detailed circuit operation and the output characteristics are analysed. As a result of analysis, it is clarified that the superior regulation characteristics of the output voltage is obtained, and that the power efficiency of the digitally controlled dc-dc converter with auxiliary switches is improved in the relatively light load region, compared with that of the conventional one with analog control circuit.
Simple VCO with Negative Voltage-Frequency Relation
Sawai Pongswatd,Amphawan Julsereewong,Kitti Tirasesth,Hirofumi Sasaki,Yan Shi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A simple voltage controlled oscillator (VCO) with negative voltage-frequency (V-F) relation is presented in this paper. The realization technique is based on the use of commercial available devices to generate tunable sawtooth and square wave signals. Decreasing the control voltage linearly increases the output oscillation frequency. The proposed VCO consists of operational transconductance amplifiers (OTAs) and an RS Flip Flop. Experimental results showing the circuit performances are agreed with the expected values. The usefulness of the proposed circuit is demonstrated through application example with reducing the output ripple waveforms of a buck converter.