Aplikasi Direct Matrix Converter pada Pengendali Kecepatan Motor Induksi 3 Fase menggunakan Modulasi Venturini

ABSTRAKMotor induksi yang paling banyak digunakan juga memiliki kekurangan seperti losses yang cukup tinggi, power factor correction, dan efisiensi yang rendah. Oleh karena itu, dibutuhkan pengendali motor induksi yang memiliki performa dan efisiensi yang tinggi. Salah satu jenis AC – AC konverter yang mempunyai efisiensi, lifetime, kekompakan dan faktor daya mendekati unity yang akan digunakan sebagai pengendali motor induksi adalah matrix converter. Metode venturini digunakan sebagai modulasi pada matrix converter. Untuk itu dalam penelitian ini dilakukan pembuatan simulasi menggunakan simulink MATLAB dan hardware matrix converter. Pengujian matrix converter menggunakan modulasi venturini sebagai pengendali motor induksi telah dilakukan dengan motor dapat berputar mencapai kecepatan nominal sebesar 1440 Rpm sesuai nameplate dan motor juga dapat berputar dibawah frekuensi nominal. Dengan penelitian ini, pengendalian motor induksi dapat lebih efisien dalam penggunaannya di berbagai bidang.Kata kunci: Matrix converter, metode venturini, motor induksi. ABSTRACTThe most widely used induction motors also have disadvantages such as fairly high losses, power factor correction, and low efficiency. From this disadvantages, we need an induction motor controller that has high performance and efficiency. One type of AC-AC converter that has efficiency, lifetime, compactness and power factor approach to unity that will be used as an induction motor controller is a matrix converter. The Venturini method is used as modulation in the matrix converter. For this reason, in this study, simulation was made using MATLAB simulink and hardware matrix converter. Matrix converter testing using venturini modulation as an induction motor controller has been done with the motor can be rotate reaching a nominal speed of 1440 Rpm according to nameplate and the motor can also rotate below the nominal frequency. It is expected that induction motor controller can be more efficient in their use in various fields.Keywords: Matrix converter, venturini method, induction motor

Rancang Bangun Multilevel Boost Converter Untuk Catu Daya Motor Arus Searah Pada Kendaraan Listrik Berbasis Mikrokontroler

Abstrak— Rangkaian multilevel boost converter memiliki prinsip kerja yang sama dengan boost converter konvensional namun rasio tegangan keluarannya lebih tinggi. Dimana tegangan keluaran dari multilevel boost converter ini akan digunakan sebagai catu daya untuk mengendalikan kecepatan putar motor arus searah (MAS). Kemudian akan dilakukan perbandingan antara tegangan keluaran multilevel boost converter dengan boost converter konvensional yang digunakan sebagai catu daya MAS. Pada penelitian ini nilai tegangan keluaran multilevel boost converter saat dihubungkan pada MAS dengan duty cycle 20% yaitu 80,3 volt dan MAS sudah mulai berputar dengan kecepatan 350 rpm. Sementara tegangan keluaran boost converter konvensional sebesar 39,4 volt namun MAS belum dapat berputar pada duty cycle 20% dan tegangan masukan yang sama yaitu 12,3 volt. Kemudian dilakukan penambahan beban MAS pada pengujian multilevel boost converter. Dimana semakin berat beban pada MAS maka torsinya akan meningkat. Dengan demikian perangkat multilevel boost converter dapat digunakan sebagai catu daya MAS untuk kendaraan listrik. Kata kunci: Multilevel boost converter, boost converter, motor arus searah Abstract—Multilevel boost converter circuit has the same working principle with conventional boost converter. Hence, the ratio of its output voltage is higher that will be used as power supply for controlling the rotational speed of MAS. Then, there will be comparison among the output voltage of multilevel boost converter and conventional boost converter which will be used as power supply of MAS. On this research, the output voltage value of multilevel boost converter which is connected with MAS at the duty cycle 20 % is 80,3 volt. Furthermore, it had rotated at the speed of 320 rpm. Meanwhile, the output voltage of boost converter conventional is 39,4 volt. On the contrary, MAS can not rotated at the duty cycle of 20 % with the same input voltage that will be 12,3 volt. Then, it will be added with load of MAS for multilevel boost converter testing. While the load of MAS is heavier, its torque will be increased too. Therefore, multilevel boost converter device can be used as power supply of MAS for electric vehicles. Keywords: Multilevel boost converter, boost converter, direct current motor

EXPLOITING CHAOTIC DYNAMICS FOR A-D CONVERTER TESTING

In this paper we discuss the possible use of chaotic signals for testing Analog-to-Digital Converters (ADCs), with particular reference to the well-known Code Density Test (CDT, also called Histogram Test). In detail, we discuss the implementation of a chaos-based discrete-time noise generator circuit, providing the theoretical analysis of its statistical characterization. The implementation of the chaos-based device is discussed with reference to a generic hardware architecture, taking into account the nonidealities introduced by the presence of noise and the variability of the circuit parameters. Based on this device, we propose a method for generating noisy samples that are distributed, over a target subinterval of the circuit output range, according to a probability density function (pdf) that can be made arbitrarily close to the ideal uniform pdf, in exchange for an acceptable reduction of the uniform-distributed samples generation rate. Theoretical results, also supported by two experiments, confirm the reliability of the proposed solution, showing that chaotic systems can represent an alternative with respect to traditional methods for the generation of signals to be used in the Code Density Test of ADCs.