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Safety Instrumented System Design in Consideration of Cost-Benefit Analysis
Amphawan Julsereewong,Teerawat Thepmanee 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
A justification of the cost for providing system instrumented system (SIS) is essential for making the right decision of companies in process industry sector. This paper presents a design of the SIS by considering in cost-benefit analysis for optimizing safety, reliability, and lifecycle costs. A tail gas treating process is employed as a case study for verifying the proposed design method. The results obtained from our case study can be useful as the tools for justifying the design and installation of safety systems. Validation results of cost-benefit analysis for the proposed SIS design are also included.
Electronically Tunable Gain Instrumentation Amplifier Using OTAs
Amphawan Julsereewong,Nuttawat Tananchai,Vanchai Riewruja 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents a simple method for realizing instrumentation amplifier with ease of gain adjustment. The proposed circuit consists of five operational transconductance amplifiers (OTAs) and two resistors in a balancing circuit. The differential gain of the proposed circuit can be electronically varied by changing the external bias currents of OTAs. The high common-mode rejection ratio (CMRR) can be obtained without requiring matched resistors. Experimental results showing the operational characteristics of the proposed circuit are included.
Simple VCO with Negative Voltage-Frequency Relation
Sawai Pongswatd,Amphawan Julsereewong,Kitti Tirasesth,Hirofumi Sasaki,Yan Shi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A simple voltage controlled oscillator (VCO) with negative voltage-frequency (V-F) relation is presented in this paper. The realization technique is based on the use of commercial available devices to generate tunable sawtooth and square wave signals. Decreasing the control voltage linearly increases the output oscillation frequency. The proposed VCO consists of operational transconductance amplifiers (OTAs) and an RS Flip Flop. Experimental results showing the circuit performances are agreed with the expected values. The usefulness of the proposed circuit is demonstrated through application example with reducing the output ripple waveforms of a buck converter.
Simple and Low-Cost Voltage-Controlled Oscillator
Teerawat Thepmanee,Amphawan Julsereewong 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents a simple circuit technique based on commercially available devices to implement voltage-controlled oscillator (VCO) with two high-impedance input terminals. By suitably setting two input signals, a linear frequency-voltage relation of the proposed VCO can be either positive or negative slope in the same scheme without any adapting configuration. The oscillation gain can be easily adjusted through the variation of a single resistor. Compared to the previous circuit based on similar technique, the proposed VCO offers significant improvement in circuit configuration. Its benefits are simpler structure, lower components, and lower costs. Experimental results showing performances of the proposed VCO are in close agreement with expected values.
A Gray-code Algorithmic Analog-to-Digital Converter based on Operational Conveyors
Wandee Petchmaneelumka,Amphawan Julsereewong 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents one-bit cell supporting input voltage to synthesize triangular-like DC transfer characteristic and digital output of Gray-code algorithmic analog-to-digital converter. The proposed one-bit cell is based on the use of operational conveyors in connection with resistors, diodes, and voltage comparator. An N-bit resolution can be simply realized by cascading the N proposed one-bit cells. Surpassing the previous one-bit cells using operational transconductance amplifiers, the proposed converter affords higher resolution and simpler configuration. The circuit operations of the proposed converter are confirmed through PSPICE simulation and experimental results.
Krit Smerpitak,Woravut Jearnpanitpong,Amphawan Julsereewong,Teerawat Thepmanee 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This paper presents a practical technique to design and implement a cooperative control of two groups with three conveyors and two rail guided vehicles (RGVs) by using two master and two slave programmable logic controllers (PLCs), respectively. The controlled conveyors and RGVs are utilized for work-in-process (WIP) movements between a corrugator and six printing machines in a manufacturer of corrugated paper boxes. The proposed technique is based on the use of wireless bridge/base stations modeled Ubiquiti Rocket M5 and Loco M5 for interconnections of two master PLCs modeled Omron CJ2M-CPU31, two slave PLCs modeled Omron CP1L-M40DT-D and connected with Omron CP1W-EIP61 module, and a host application over a control network to communicate with each other through EtherNet/IP technology. Input and output devices of each controlled subsystem are hardwired to each PLC. The transmission and reception schemes to enable real-time input/output data exchanges between the PLCs are specified with tag names for cyclic communications on data links. The proposed multi-PLC control system for WIP movements can operate in accordance with the manufacturer’s requirements.