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Author: search.filters.author.Sasaki, HirofumiSubject: search.filters.subject.Converter

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    Design of 5x step-up sc dc-dc converter for industrial wireless transmitter
    (2011-08-01)
    Pongswatd, Sawai
    ;
    Kunsri-U-Chane, Kachane
    ;
    Smerpituk, Krit
    ;
    Eguchi, Kei
    ;
    Sasaki, Hirofumi
    In this paper, a 5x step-up switched-capacitor (SC) DC-DC converter utilizing solar energy for industrial wireless transmitters is presented. A wireless transmitter can be supplied by its internal battery in combination with the proposed converter for long battery runtime. A Rosemount wireless transmitter from Emerson Process Management Company is used as a target application example in process measurement. The proposed converter is designed for receiving 1.5 V solar cells and powering 7.5 V connected in parallel with wireless transmitter battery. The validity of circuit design is conrmed by theoretical analysis and SPICE simulation. The derived formulas will be helpful to estimate circuit characteristics. Moreover, SPICE simulation values agree well with theoretical results.
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    Parallel 5x step-up SC DC-DC converter for power efficiency improvement
    (2011-01-01)
    Pongswatd, Sawai
    ;
    Smerpituk, Krit
    ;
    Eguchi, Kei
    ;
    Sasaki, Hirofumi
    In switched-capacitor converter, the fluctuation of on-resistance effects power efficiency in proportion to the decrease of output load. This paper presents switched-capacitor (SC) DC-DC converter that parallel-connected to improve the power efficiency. The converter utilizes solar energy for industrial wireless transmitter. It can be supplied by its internal battery in combination with the proposed converter for long battery runtime. A Rosemount wireless transmitter from Emerson Process Management Company is used as a target application example in process measurement. The proposed converter is designed for receiving 1.5 V solar cells and powering 7.5 V connect in parallel with wireless transmitter battery. The validity of the theoretical analyses is confirmed by SPICE simulations and experimental results. The derived formulas will be helpful to estimate circuit characteristics. Moreover, SPICE simulation values and experimental results agree well with theoretical results. © 2011 SICE.