Petchmaneelumka, Wandee

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Petchmaneelumka, Wandee
Alternative Name
Petchmaneelumka, W.
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Email
wandee.pe@kmitl.ac.th

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    Item type:Publication,
    Power monitoring circuit using operational amplifiers
    (2010-12-01)
    Rerkratn, Apinai
    ;
    Petchmaneelumka, Wandee
    ;
    Julsereewong, Prasit
    ;
    Riewruja, Vanchai
    In this paper presents a power monitoring circuit for battery energy management system using operational amplifiers. The proposed scheme consists of a current sensing circuit with voltage output and an analog multiplier. The voltage output of current sensing circuit is directly proportional to load current. The multiplying result of the load current in the form of voltage signal and the load voltage becomes the load power in term of output voltage of analog multiplier. The configuration of the proposed power monitoring circuit is simple and economically attractive. Simulation and experimental results confirming the performance of the proposed circuit are agreed with the expected values. ©ICROS.
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    Item type:Publication,
    Linear-range extension for linear variable differential transformer using binomial series
    (2020-01-01)
    Petchmaneelumka, Wandee
    ;
    Songsuwankit, Kanoknuch
    ;
    Tongcharoen, Jakkapun
    ;
    Riewruja, Vanchai
    The linear-range extension technique for a linear variable differential transformer (LVDT) is described in this paper. Generally, the LVDT has a narrow linear operating range caused by its nonlinear transfer characteristic. To extend the linear operating range, the nonlinear behavior of the LVDT must be adjusted. In this paper, the circuit building block providing the LVDT inverse transfer characteristic using binomial series approximation is proposed for linearizing the nonlinear behavior of the LVDT. The third-order inverse transfer characteristic of the LVDT is synthesized from analog multipliers and a difference amplifier comprising an operational amplifier (opamp). All active devices used in this study are commercially available. Therefore, the attraction of the proposed technique is in the simple configuration and low cost, making it suitable for an embedded measurement system. The performance of the proposed technique is discussed in detail. Simulation and experimental results confirming the performance are also included. As a result, the linear range of the commercial LVDT used in this study can be extended more than 500%. The full scale error of the measured value is about 0.23% over the entire operating range.