Comparative Analysis of a Three Phase Inverter with Different Loads

DC–AC inverters play a crucial factor in the modern era to satisfying the demand of energy conversion, which is definitely for a better lifestyle and developing smart facilities. In this paper a deeper study has been taken place to understand the behavior of the inverter base on three phase bridge inverters. The scenarios for the inverters respectively with pure resistive loads R and inductive resistive loads RL are both discussed. The term load is referring to the brushless DC motor (BLDC) which is more reliable than regular or permanent magnet DC motors, this study will help to understand the effect of these components in the inverters. These effects could be related to friction and other electrical problem such as spark which they are associated with the DC components’ operation. Moreover, solving differential equations numerically using powerful software such as MTLAB, which certainly solidify the comprehension of the system operation. The inverter was simulated using MATLAB as a variable DC and AC power supply to in investigate the effect of varying the parameters of the reference input signals such as carrier frequency, duty cycle and the output load such as inductance. Finally, a flowchart of the system is included described both hardware and software.

Evaluating the Effect of Optical Coupler in a 1.5KVA PWM Inverter

This paper presents the design and implementation of a 1.5KVA inverter system. The aim of the paper is to evaluate the effect of optocoupling technology on inverter system. The developed circuit compares the output load with the input voltage when 4N35 opto coupler is used and in the absence of it. Two different inverter systems were designed and the voltages at the output pins of Sg3524 were measured. It was observed that there seems to be fluctuation in the output voltage of the system without optocoupling and the voltage of the inverter keeps dropping till the system shuts down. The basic principle of the operation of the inverter is a simple conversion of 12V DC at a frequency of 50Hz to 230V AC. The result shows that optocoupling technique is essential part of an inverter system to achieve a good efficiency.

Efectos de la Potenciación Post-Activación con cargas de máxima potencia sobre el rendimiento en sprint y cambio de dirección en jugadores de baloncesto (Effects of Post-Activation Potentiation with maximal power loads on Sprint and Change of Direction p

El objetivo de este estudio fue comprobar el efecto de la realización de una Potenciación Post-Activación (PPA) a través del ejercicio de media sentadilla sobre el rendimiento en sprint y cambio de dirección en jugadores de baloncesto. 12 jugadores de baloncesto participaron en esta investigación realizando dos sesiones. En la primera sesión, realizaron un test incremental de media sentadilla en multipower para conocer la carga con la que generaban la máxima potencia durante la fase concéntrica. En la segunda sesión, tras un calentamiento estandarizado, realizaron los test de sprint (30 m) y cambio de dirección (V-Cut test). Posteriormente, hicieron seis repeticiones de media sentadilla con la carga de máxima potencia de la fase concéntrica obtenida en la primera sesión. Tras cuatro minutos de descanso volvieron a realizar los test de sprint y cambio de dirección. El tiempo en el sprint antes y después de la potenciación fue 4,72 ± 0,25 segundos y 4,71 ± 0,25 segundos, respectivamente. En el V-Cut el tiempo del test antes de la potenciación fue de 8,06 ± 0,44 segundos y tras ella de 7,98 ± 0,38 segundos. El protocolo de PPA basado en la realización de media sentadilla con la carga con la que se desarrolla la máxima potencia durante la fase concéntrica no sirvió como potenciador del rendimiento en sprint y cambio de dirección en jugadores de baloncesto. Abstract. The aim of this study was to determine the effects of a Post-Activation Potentiation (PAP) protocol based on half squat on sprint and change of direction performance. 12 basketball players participated in this investigation performing two sessions. In the first session, participants executed a half squat incremental test in a Smith machine in order to determine maximal power output during the concentric phase. In the second session, after a standardized warm-up, participants performed a sprint test (30 m) and a change of direction test (V-Cut test). After that, the players performed six half squat repetitions with the maximal power output load obtained in the first session. After four minutes rest, they performed the sprint and the change of direction test. Sprint time was 4.72 ± 0.25 s before PAP and 4.71 ± 0.25 s after PAP. V-Cut test was 8.06 ± 0.44 s and 7.98 ± 0.38 s before and after PAP, respectively. A PAP protocol based on half squat with maximal power output during concentric phase load did not serve to enhance sprint and change of direction performance in basketball players.

Alat Ukur Tinggi untuk Pengujian Status Gizi Balita dengan Metode Anthropometry

Masalah gizi pada balita dapat menghambat perkembangan anak. Balita termasuk ke dalam kelompok usia berisiko tinggi terhadap penyakit. Kekurangan maupun kelebihan asupan zat gizi pada balita dapat memengaruhi status gizi dan status kesehatannya. Tujuan penelitian ini adalah merancang alat ukur berat dan tinggi badan dilengkapi penilaian status gizi balita. Penilaian status gizi diperlukan apabila terjadi penyimpangan status gizi pada balita dapat segera diberi tindakan agar kondisi balita tidak memburuk. Kontribusi penelitian ini adalah mengukur berat dan tinggi badan balita. Dari data berat dan tinggi badan dapat diketahui penilaian status gizi balita. Dasar utama dalam penelitian status gizi balita menggunakan metode antropometri. Pembuatan modul ini dirancang dengan menggunakan arduino sebagai pengontrol utama. Sensor berat badan menggunakan sensor load cell. Output load cell akan dikuatkan oleh modul HX711 lalu diolah oleh arduino, kemudian akan ditampilkan dalam bentuk penilaian status gizi. Berdasarlan hasil pengukuran berat badan pada 5 balita menggunakan sensor loadcell diperoleh error maksimal 0.32% dengan rata rata error sebesar 0.132%. Alat ini dapat diimplementasikan pada pemantauan pertumbuhan berat dan tinggi balita.

Performance evaluation of PI controller for positive output Luo converter

The aim of this work is to design and analyze a Proportional Integral (PI) controller for Positive Output Luo Converter applications. Positive Output Luo Converter is a developed DC-DC converter. It is respected as a right choice for most industrial application where the rate of the output load voltage must be varying between the low and high values of the input value of voltage, output voltage rise and fall is smaller. This converter involve Power electronics switches (Diodes and MOSFET) since these elements are non-linear. The detailed model includes high-frequency switching that is introducing discontinuities into the model. PI controller coefficients (kp, ki) are calculated by particle swarm optimization (PSO) to provide optimal PI as hybrid PI by PSO controller with simple design procedure .Transient and steady state responses requirement of the system are considered in designing the proposed PI controller. The consequences show that the time of performing characteristics of PSO-PI controller established on integral squared error (ISE) performance index has the best time performing characteristics, line disturbance, load disturbance and set point variation.

Environment-friendly FSM design on ultra-scale architecture: energy-efficient green computing approach

Purpose The Purpose of this research is to make an energy efficient finite state machine (FSM) in order to achieve the core objective of green computing because FSM is an indispensable part of multiple computer hardware. Design/methodology/approach This study uses ultra-scale plus FPGA architecture in place of seven-series field-programmable gate array (FPGA) for the implementation of the FSM design and also uses output load scaling for the design of environment-friendly FSM. This design study is done using Verilog Hardware description language and Vivado integrated system environment design tools and implemented on 16 nm ultra-scale FPGA architecture. Findings There is up to 98.57% reduction in dynamic power when operating frequency is managed as per smart job scheduling. There is up to a 21.97% reduction in static power with proper management of output load capacitance. There is up to 98.43% saving in dynamic power with the proposed management of output load capacitance. Originality/value The proposed design will be environment friendly that eventually leads to the green earth. This is the main motive of the research area i.e. green computing.