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    Compensation of Temperature Effect for LVDT Transducer
    (2018-11-01)
    Petchmaneelumka, W.
    ;
    Rerkratn, A.
    ;
    Luangpol, A.
    ;
    Riewruja, V.
    In this paper, a circuit technique to compensate the temperature effect in the output signal of the linear variable differential transformer (LVDT) is presented. The realization technique is based on the proposed feedback configuration to minimize the active component used in the circuit. The subtraction and sum schemes are provided instead of the error detector used in the traditional feedback loop. The feedback signal is obtained from two secondary winding signals of LVDT. The proposed feedback technique requires only the proportional control action to minimize the error caused by the variation of the ambient temperature. The sensitivity of LVDT is unaffected from the proposed compensation technique. The performances of the proposed technique are discussed in detail and confirmed by experimental implementation using the commercial devices. The maximum percentage error can be reduced from 6.52% of the LVDT output signal without temperature compensation to 0.05% of the proposed technique for the ambient temperature varied from 25°C to 70°C. The purpose of the proposed technique is emphasized in terms of high performance, simple configuration and low cost.
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    Simple vector summation circuit using opamps
    (2011-01-01)
    Kamsri, Thawatchai
    ;
    Julsereewong, Amphawan
    ;
    Keawpoonsuk, Anucha
    ;
    Petchmaneelumka, Wandee
    ;
    Riewruja, Vanchai
    This paper presents a vector summation circuit using operational amplifiers (opamps) for multiple voltage inputs. The implementation method based on the opamp supply-current sensing utilizes an inherently quadratic characteristic of the opamp class-AB output stage. The distinguishing features of the proposed implementation are simple configuration and low cost. Experimental results verifying the performances of the proposed vector summation circuit are included. © 2011 SICE.
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    Operational conveyor-based interface circuit for differential resistive sensors
    (2011-01-01)
    Julsereewong, Prasit
    ;
    Julsereewong, Amphawan
    ;
    Najaroen, Thongchai
    This paper presents an interface circuit suitable for use with differential resistive sensors. The implementation method based on operational conveyors is easily implemented in integrated circuit form. Surpassing the similar circuit using only current conveyors, the proposed configuration affords significant improvement in accuracy. PSPICE simulation and experimental results in good agreement with theoretical analysis are included. © 2011 SICE.