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Author: search.filters.author.Smerpituk, Krit

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    Design of fractional conversion ratio SC DC-DC converters
    (2013-09-02)
    Pongswatd, Sawai
    ;
    Smerpituk, Krit
    ;
    Julsereewong, Prasit
    ;
    Eguchi, Kei
    ;
    Sasaki, Hirofumi
    This paper presents the switched-capacitor (SC) circuit structure whose design conversion ratio is fraction multiple. The proposed converters can step up or step down the input voltage and bidirectional power flow by using dual converters connected. The 2x and 1/2x fraction conversion ratio is specified as a case study. The characteristics of the proposed converters are clarified by theoretical analyses. In addition, the simulation and experimental show the validity of circuit design, where theoretical results correspond well with simulation and experimental results. The proposed converters will be useful for battery charger, battery equalizer and dc power transfer. © 2013 IEEE.
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    Design of multiple conversion ratio and bidirectional power flow by using dual SC DC-DC converters
    (2013-03-28)
    Pongswatd, Sawai
    ;
    Smerpituk, Krit
    ;
    Eguchi, Kei
    ;
    Sasaki, Hirofumi
    This paper presents the simple design technique to implement dual SC DCDC converters that can convert input voltage step up or step down. The output of proposed converters is connected between individual converter output capacitors so that the output voltage can convert to multiple levels step up or step down and bidirectional power flow. The conversion ratio can be specified by simple circuit structure by connecting the capacitors in parallel or series. The circuits are designed by digital technique to on-off the switches for step up or step down conversion ratio 1x, 2x, 3x, jx, or 1x, 1/2x, 1/3x, 1/jx, respectively. The characteristics of the proposed converter are clarified by theoretical analyses. In addition, experimentation shows the validity of circuit design, where theoretical results correspond well with experimentation results. The proposed converter will be useful as a driver circuit for battery charger and power battery transfer between different level voltages. © 2013 ICIC International.
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    Design of step up and down Bi-directional switched capacitor DC-DC converter
    (2012-02-01)
    Pongswatd, Sawai
    ;
    Smerpituk, Krit
    ;
    Eguchi, Kei
    ;
    Sasaki, Hirofumi
    This paper presents the design technique to implement a DC-DC converter that can convert input voltage with step-up or step-down, and bi-directional power flow. The conversion ratio and power efficiency of the converter can be specified by circuit structure, which has capacitors connected in parallel or series configuration. The conversion ratios of step up and step down are 2x, 3x, 4x,... and 1/2x, 1/3x, 1/4x,..., respectively. The direction of power flow can be controlled by state of input and output switches. SPICE simulation results show that output voltage and power efficiency of the proposed converter agree well with theoretical values. © 2012 ICIC International.
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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.