KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 232

Some of the metrics are blocked by your
consent settings
Electronically tunable compact inductance simulator with experimental verification
(2024-06-01)
Bhardwaj, Kapil
;
Srivastava, Mayank
;
Kumar, Anand
;
Singh, Ramendra
;
Tangsrirat, Worapong
A novel inductance simulation circuit employing only two dual-output voltage-differencing buffered amplifiers (DO-VDBAs) and a single capacitance (grounded) is proposed in this paper. The reported configuration is a purely resistor-less realization that provides electronically controllable realized inductance through biasing quantities of DO-VDBAs and does not rely on any constraints related to matched values of parameters. This structure exhibits excellent behavior under the influence of tracking errors in DO-VDBAs and does not exhibit instability at high frequencies. The simple and compact metal-oxide semiconductor (MOS) implementation of the DO-VDBAs (eight MOS per DO-VDBA) and adoption of grounded capacitance make the proposed circuit suitable for on-chip realization from the perspective of chip area consumption. The function of the pure grounded inductance is validated through high pass/bandpass filtering applications. To test the proposed design, simulations were performed in the PSPICE environment. Experimental validation was also conducted using the integrated circuit CA3080 and operational amplifier LF-356.
Some of the metrics are blocked by your
consent settings
Design of Mixed-Mode Analog PID Controller with CFOAs
(2024-05-01)
Roongmuanpha, Natchanai
;
Satansup, Jetsdaporn
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
The design of a mixed-mode proportional-integral-derivative (PID) controller circuit using current-feedback operational amplifiers (CFOAs) as active components is proposed. With the same circuit topology, the proposed configuration of three CFOAs, four resistors, and two capacitors is capable of performing the PID controller in each of the following four modes: voltage mode, trans-admittance mode, current mode, and trans-impedance mode. Numerous mathematical analyses are conducted to determine the controller’s performance under both ideal and non-ideal conditions. Additionally, the mixed-mode second-order lowpass filter is suggested and also used to examine the workability of the proposed mixed-mode PID controller in a feedback control structure. The proposed PID controller is implemented with the commercially available IC-type CFOA AD844, and the simulation results are presented to illustrate the functionality of the controller and its closed-loop control system. According to the findings, the total power consumption of the proposed PID controller is 0.348 W, with symmetrical supply voltages of ±9 V. It also has a temperature variation of less than 0.2% over the AD844’s usable range. Monte Carlo statistical analysis results revealed that the gain responses of the controller exhibited a deviation of no more than 7.72% from the theoretical value. The controlled filter in a closed-loop control system has a 43% faster rise time and peak time than the uncontrolled filter in all four modes of operation. It also has a steady-state error less than 0.2 mV for voltage responses and 0.72 µA for current responses.
Some of the metrics are blocked by your
consent settings
Dual-Mode Biquadratic Filter Employing Second-Generation Voltage Conveyors DM Biquadratic Filter Employing VCIIs
(2024-02-21)
Roongmuanpha, Natchanai
;
Mongkolwai, Pratya
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
In this paper, a dual-mode biquadratic filter is suggested. The proposed filter employs two Second-Generation Voltage Conveyors (VCIIs) along with four resistors and two capacitors. The suggested filter can realize all five standard biquadratic filter functions such as lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS), and allpass (AP) in both voltage-mode (VM) and current-mode (CM) without needing to modify its circuit structure. The quality factor (Q) and natural angular frequency (ωo) can be accurately and separately controlled through the passive component. It additionally offers the capability of providing the output voltage at the low-output impedance terminal in VM. The effects of the VCII non-idealities on the filter performance have been analyzed in detail. The proposed filter also offers low active and passive sensitivity features. Simulation results achieved with PSPICE software using TSMC CMOS 0.18 μm parameter have been validated and compared with the theoretical findings.
Some of the metrics are blocked by your
consent settings
PREDICTION OF AIR POLLUTION FROM POWER GENERATION USING MACHINE LEARNING
(2024-01-31)
Photsathian, Thongchai
;
Suttikul, Thitiporn
;
Tangsrirat, Worapong
Electrical energy is now widely recognized as an essential part of life for humans, as it powers many daily amenities and devices that people cannot function without. Examples of these include traffic signals, medical equipment in hospitals, electrical appliances used in homes and offices, and public transportation. The process that generates electricity can pollute the air. Even though natural gas used in power plants is derived from fossil fuels, it can nevertheless produce air pollutants involving particulate matter (PM), nitrogen oxides (NO<inf>x</inf>), and carbon monoxide (CO), which affect human health and cause environmental problems. Numerous researchers have devoted significant efforts to developing methods that not only facilitate the monitoring of current air quality but also possess the capability to predict the impacts of this increasing rise. The primary cause of air pollution issues associated with electricity generation is the combustion of fossil fuels. The objective of this study was to create three multiple linear regression models using artificial intelligence (AI) technology and data collected from sensors positioned around the energy generator. The objective was to precisely predict the amount of air pollution that electricity generation would produce. The highly accurate forecasted data proved valuable in determining operational parameters that resulted in minimal air pollution emissions. The predicted values were accurate with the mean squared error (MSE) of 0.008, the mean absolute error (MAE) of 0.071, and the mean absolute percentage error (MAPE) of 0.006 for the turbine energy yield (TEY). For the CO, the MSE was 2.029, the MAE was 0.791, and the MAPE was 0.934. For the NO<inf>x</inf>, the MSE was 69.479, the MAE was 6.148, and the MAPE was 0.096. The results demonstrate that the models developed have a high level of accuracy in identifying operational conditions that result in minimal air pollution emissions, with the exception of NO<inf>x</inf>. The accuracy of the NO<inf>x</inf> model is relatively lower, but it may still be used to estimate the pattern of NO<inf>x</inf> emissions.
Some of the metrics are blocked by your
consent settings
Novel Minimum Component Dual Mode Biquadratic SIMO Filter with Electronic Tunability
(2024-01-01)
Srivastava, Abhishek
;
Prasad, Harishchandra
;
Singh, Umesh
;
Om Mishra, Shri
;
Faseehuddin, Mohammad
Two topologies of minimum component single input multiple output (SIMO) filters are designed by employing a versatile active building block (ABB), the current conveyor transconductance amplifier (CCTA). The proposed filters work in current mode (CM) and trans-admittance mode (TAM). The CM SIMO filter is designed using two CCTA and two grounded capacitors. The CM filter can be converted to TAM filter just by adding a grounded resistor without any change in the topology. There is no need of passive component matching, and the filters provide all the five responses namely, high-pass (HP), band-pass (BP), low-pass (LP), all-pass (AP), and band-stop (BS) simultaneously. In addition, it provides an independent electronic tunability of angular frequency (ω) and quality factor (Q). The active and passive sensitivities of the filter parameters are low. In CM mode the filter offers low input impedances and high output impedances and in TAM mode the filter offers high input impedance and hight output impedance that support the cascadeability. The CM and TAM filters are designed for a frequency 16.23MHz and the simulation results employing 0.18 µm CMOS technology parameters at a supply voltage of ±1.25 V are obtained using Cadence software to validate the proposed design. Also, the proposed CM SIMO universal filter has been implemented in hardware to confirm its practicality. The commercially available integrated circuits (ICs), the current feedback operational amplifier (AD844) and operational transconductance amplifier (CA3080) and employed for the experimental validation.
Some of the metrics are blocked by your
consent settings
Practical Realization of Only Active Floating Lossless Inductance Simulator
(2024-01-01)
Roongmuanpha, Natchanai
;
Unhavanich, Sumalee
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
This paper describes an electronically controllable floating lossless inductance simulator circuit implemented with only off-the-shelf available integrated circuits, namely LT1228 and operational amplifier (OA). The proposed design consists solely of two LT1228s and a single OA. By using an active element named LT1228, the equivalent inductance can be tuned electronically with depended on the externally supplied current applied to LT1228. The proposed simulator imposed just one component matching restriction that required the equality of two transconductances. It is easily attainable with a simple current mirror. The worthiness of the proposed floating inductance simulator has been proven and applied to the construction of the 2nd-order RLC highpass/bandpass filter as an application. PSPICE simulations are used to investigate the characteristics of the proposed simulator and its filter realization.
Some of the metrics are blocked by your
consent settings
VDGA-Based Resistorless Dual-Mode SIMO Biquadratic Filter
(2024-01-01)
Pimpol, Jirapun
;
Channumsin, Orapin
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
This work introduces the synthesis of a resistorless single-input multiple-output dual-mode biquadratic filter. The proposed circuit can perform both voltage-mode and current-mode operations without making circuit modifications. It consists of two voltage differencing gain amplifiers (VDGAs) as an active element, together with only two grounded capacitors as passive elements. Furthermore, it has the capability to produce the conventional biquad filter functions - namely, simultaneous highpass, bandpass, and lowpass responses - in either voltage or current mode. The proposed dual-mode biquad filter can electronically adjust significant filter parameters. TSMC 0.25-μ m CMOS process parameters are utilized in computer simulation to validate the theoretical expectations.
Some of the metrics are blocked by your
consent settings
Circular Object Sorting Machine with LabVIEW Software Control
(2024-01-01)
Mongkolwai, Pratya
;
Satansup, Jetsdaporn
;
Dumawipata, Teerasilapa
;
Nakroungsri, Teerapat
;
Laotuy, Monthathip
This article describes a project to construct a circular object-sorting machine through the application of image-processing techniques. For the acquisition, processing, and transmission of data, LabVIEW (Laboratory Virtual Instrument Engineering Workbench) software is utilized. The operation of the sorting device is controlled by an Arduino microcontroller board, which is the Arduino Mega 2560. The project aims to efficiently separate circular objects by extracting color information, size measurements, and quantity data through image processing. The experimental results successfully demonstrate the sorting of circular objects and display color values, size measurements, and the number of sorted objects on an efficient LCD screen. The integration of LabVIEW and Arduino provides an effective solution for circular object sorting, aligning with the theoretical principles presented in the project.
Some of the metrics are blocked by your
consent settings
Synchronization of a Seven-Term Chaotic 4D System Using a Simplified Fixed-Time Adaptive Integral Nonsingular Terminal Sliding Mode Control and Its Circuit Realization
(2024-01-01)
Wongvanich, Napasool
;
Moonmuang, Pitchayanin
;
Roongmuanpha, Natchanai
;
Tangsrirat, Worapong
This work presents an adaptive gain fixed-time synchronization of a seven-term hyperchaotic 4D system, along with its analog circuitry realizations. To facilitate a simplistic circuit realization of the closed loop system, the control design process initiates with the design of a novel, simplified fixed-time stability lemma that gives a lower convergence time, while being easier to compute. A nonlinear, fixed-time adaptive-gain nonsingular terminal sliding mode controller was then designed to synchronize the hyperchaotic 4D system. Theoretical analyses successfully achieved fixed-time synchronization, and computer simulations verified the achievement of zero-error convergence across all states within 1 second, irrespective of the initial conditions and even in the presence of significant parameter and disturbance changes. Analog circuitry implementations of the adaptive gain fixed-time chaotic synchronization configuration were realized using commercially available components, for instance, LF357 and AD633. The circuit equations were devised to replicate those used in the controller, with the goal of facilitating troubleshooting by ensuring simplicity. Electronics workability was tested using PSPICE simulation program. The results demonstrated that active synchronization was achieved in fixed time with less than 1% error across the states in the presence of disturbances. Finally, the developed fixed-time chaotic synchronization was applied to a secure communication system. The results indicate that the original and recovered messages exhibit a high degree of similarity to each other after a fixed duration of 1 second.
Some of the metrics are blocked by your
consent settings
Robust Practical Fixed-Time Control and Application to DC-DC Buck Converter
(2024-01-01)
Wongvanich, Napasool
;
Cholahan, Varin
;
Tangsrirat, Worapong
This work presents an adaptive fixed-time speed controller of permanent magnet synchronous motors for a class of second-order nonlinear systems based on practical fixed-time stability, in which a sliding mode surface with a constant exponent coefficient is designed to avoid singularities and achieve a fast convergence rate. This method is easy to implement compared to other sophisticated fixed-time controllers. In addition, the upper bound of control inputs is selected to prevent saturation limitations. Following that, the Lyapunov function expresses the close-loop stability of a practical fixed-time controller. An adaptive disturbance rejection with smooth function is presented to attenuate the total disturbances, chattering, and steady-state error. The tracking error is integrated into a bounded residual region within a specified time. Finally, numerical simulations are given to verify the performance of both controller and disturbance rejection mechanisms.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results