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    Performance and electromagnetic interference mitigation of DC-DC converter connected to photovoltaic panel
    (2019-11-01)
    Jettanasen, C.
    ;
    Pothisarn, C.
    Renewable energy has been rapidly increased in terms of installed capacity. However, the electronic components inside such a system can cause a serious threat such as Electromagnetic Interference (EMI) to nearby sensitive devices/equipment. This paper aims to study on performance of DC-DC boost converter connected to photovoltaic panel and how to reduce EMI emissions issued in the system. A passive EMI low-pass filtering is one of various mitigation techniques. The designed converter connected to photovoltaic panel and EMI filter are tested in both simulation software and field testing by using EN55022 standard as a reference.
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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.
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    A DSP-based modified slip energy recovery drive using a 12-pulse converter and shunt chopper for a speed control system of a wound rotor induction motor
    (2008-05-01)
    Tunyasrirut, Satean
    ;
    Ngamwiwit, Jongkol
    ;
    Kinnares, Vijit
    ;
    Furuya, Tadayoshi
    ;
    Yamamoto, Yoshiichi
    This paper introduces a modified slip energy recovery drive system for speed control of a wound rotor induction motor offering improvement of drive performance, particularly line power factor and overall system efficiency. A 12-pulse line commutated thyristor converter operating in an inverter mode in conjunction with an additional IGBT shunt chopper is employed to transfer slip energy back to ac mains supply via three phase transformers. This approach offers motor speed control by varying the duty cycle of the chopper instead of changing the inverter firing angle. As a consequence, supply power factor can be improved. The servo state feedback designed by linear quadratic regulator (LQR) with observer is also included in order to keep motor speed to be constant over a certain range of operating conditions by using the estimated dc link current derived from motor speed. The advantage of this technique is absence of current transducers for current feedback control loop. The overall control system is implemented on DSP, DS1104'TMS320F240 controller board. Experimental results are illustrated in order to validate performance of the proposed system. © 2007 Elsevier B.V. All rights reserved.