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Positive/Negative Floating Resistor Using OTAs
Wandee Petchmaneelumka,Prasit Julsereewong,Vanchai Riewruja 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A method for realizing a floating resistor based on operational transconductance amplifiers (OTAs) is presented in this paper. The proposed design is composed of only OTAs without any external resistor. The magnitude of the obtained resistance is electronically varied by adjusting the external bias currents of OTAs. Both a positive and a negative resistance can be achieved in the same circuit. The proposed scheme provides the simple configuration and low cost. The circuit performances based on the use of the commercially available OTAs are confirmed by the experimental results.
Building Power Management for Energy Saving
Satit Mangkalajan,Prasit Julsereewong,Amphawan Julsereeong 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper presents a technique to manage a building power for energy saving. A university building is examined as a case study. Objective of the case study is to schedule events in general purpose classrooms with minimum energy consumption. The proposed method is based on concepts of decision tree analysis and balanced three-phase system. The software written on LabVIEW is developed for scheduling events in classrooms and balancing three-phase current loads. Performance of the proposed method is confirmed through simulation results.
Simple Interface Circuit with Lead-Wire-Resistance Compensation for Single Resistive Sensors
Wandee Petchmaneelumka,Prasit Julsereewong,Amphawan Julsereewong,Jaturon Tongpakpanang 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
A simple interface circuit for single resistive sensor-based remote measurements is presented. The realization method using commercially available devices provides not only the output signal linearly related to resistive sensor changes but also the compensation of effect due to lead-wire resistances. Performance of the proposed circuit is confirmed through experimental results.
Design of functional safety model for tail gas treating process
Jirawat Poomhuang,Prasit Julsereewong,Teerawat Thepmanee 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
This paper addresses the design of functional safety model for process automation in accord with IEC 61508/61511 standard. Functional safety design of a tail gas treating unit has been conducted in this study. The quantitative fault tree analysis approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the designer and safety engineer not only to identify how subsystems and components could fail and what are the corresponding effects on the whole system, but also to quantify the reliability parameters for complex systems. The analytical evaluation of the probability failure on demand and the failure rate for the system, all these component are supposed to be not repairable and the probability distributions of time to failure random variables are assumed to be exponential function. The calculation result is used as the criterion for the safety instrumented function design in order to conform the required safety integrity level. The experimental show that the subsystem architecture of safety instrumented function has a significant impact on improving the average probability of failure on demand of the process.
Simple Square-Root Extractor Using Op Amps
Thawatchai Kamsri,Prasit Julsereewong,Vanchai Riewruja 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the simple and inexpensive method to implement a square-root extractor for voltage input signal. The proposed extractor is based on the use of two operational amplifiers (op amps) as only active elements. The proposed technique employs the op amp supply-current sensing to achieve an inherently quadratic characteristic. The low-output distortion in output signal can be achieved. Experimental results verifying the characteristic of the proposed circuit are also included.
Power Monitoring Circuit Using Operational Amplifiers
Apinai Rerkratn,Wandee Petchmaneelumka,Prasit Julsereewong,Vanchai Riewruja 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
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.