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Author: search.filters.author.Rerkratn, ApinaiSubject: search.filters.subject.Amplitude detector

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    Low-ripple output interface circuit for electrical conductivity measurement
    (2016-01-01)
    Kaewpoonsuk, Anucha
    ;
    Suphramit, Suphawadee
    ;
    Rerkratn, Apinai
    In this paper, an interface circuit for measuring the electrical conductivity of electrolyte solution is dcscribcd. It consists of a quadrature oscillator, a non-Inverting amplifier, a voltage-to-current converter, a peak detector, a sample-and-hold circuit, and the designed control signal generator. The proposed technique is based on the use of peak-and-hold method to detect the amplitude of sinusoidal output signal instead of the traditional method that uses the rectifier circuit connected with low-pass filter. The proposed circuit provides the obtained output in the form of DC voltage with Low ripple and fast response. Experimental results verifying the circuit performance are agreed with the theoretical values.
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    A simple amplitude detector-based demodulator for resolver converters
    (2010-12-01)
    Kaewpoonsuk, Anucha
    ;
    Katman, Ratchanoo
    ;
    Kamsri, Thawatchai
    ;
    Rerkratn, Apinai
    ;
    Riewruja, Vanchai
    This paper presents a simple method based on sinusoidal-amplitude detector for realizing the resolver-signal demodulator. The proposed demodulator consists of two full-wave rectifiers, two ±unity-gain amplifiers, and two sinusoidal-amplitude detectors with control switches. Two output voltages are proportional to sine and cosine envelopes of resolver-shaft angle without low-pass filter. Experimental results demonstrating characteristic of the proposed circuit are included. ©ICROS.