scholarly journals Rancang Bangun Inverter Tiga Phasa Back to Back Converter Pada Sistem Konversi Energi Angin

2017 ◽  
Vol 2 (1) ◽  
pp. 38-46
Author(s):  
Rifdian I.S
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Buck Converter ◽  
Mode Switching ◽  
Pulse Width Modulated

Sistem konversi energi angin terdiri dari turbin angin, generator, dan konverter. Konverter dalam energi angin tersusun dari back to back converter yang terdiri dari rectifier dan inverter. Kecepatan angin yang berubah-ubah akan mengakibatkan naik turunnya tegangan output generator dan frekuensi output generator. Pengaturan tegangan ouput dilakukan dengan pengaturan eksitasi pada generator. Untuk menghilangkan efek naik turunnya frekuensi digunakan rectifier dan inverter yang tersusun dalam back to back converter. Pada penelitian ini akan disusun rancang bangun dari rectifier dan inverter dari back to back converter yang digunakan. Back to back converter ini terdiri dari rangkaian penyearah tidak terkontrol, buck converter, dan Inverter 3 fasa yang digunakan untuk menggerakkan motor induksi 3 fasa. Modul ini mendapat sumber dari jala-jala 3 fasa yang dihubungkan pada rangkaian penyearah yang diatur melalui variac 3 fasa dengan keluaran 0 - 200 Vdc. Kemudian keluaran DC dari rangkaian penyearah terhubung dengan buck converter, sehingga keluaran DC tersebut dapat memenuhi input tegangan pada inverter 3 fasa yaitu 0 – 100 Vac. Dengan keluaran tegangan inverter untuk menjalankan motor induksi 3 fasa. Teknik switching yang digunakan untuk penyulutan mosfet pada inverter adalah PWM (Pulse Width Modulated) dengan mode switching tegangan konduksi 180°, dimana Pembangkitan sinyal PWM ini dikontrol melalui mikrokontroler ATmega 8535. Dari hasil pengujian didapatkan % error tegangan keluaran pada inverter 3 fasa sebesar 26,47% untuk duty cycle 50% dan 11,11% untuk duty cyle 70%.

Pulse width modulated control of the full bridge buck converter

1994 ◽  
Vol 25 (4) ◽  
pp. 651-667 ◽  
Author(s):  
HEBERTT SIRA-RAMIREZ ◽  
MARCO TULIO PRADA-RIZZO
Keyword(s):  
Pulse Width ◽  
Buck Converter ◽  
Pulse Width Modulated

EFFECT OF PULSE WIDTH MODULATION ON DC MOTOR SPEED

2017 ◽  
Vol 5 (2) ◽  
pp. 42 ◽  
Author(s):  
Cosmas Tatenda Katsambe ◽  
Vinukumar Luckose ◽  
Nurul Shahrizan Shahabuddin
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Dc Motor ◽  
Buck Converter ◽  
Motor Speed ◽  
Push Button ◽  
Cycle Rate ◽  
Speed Controller ◽  
And Performance

Pulse width modulation (PWM) is used to generate pulses with variable duty cycle rate. The rapid rising and falling edges of PWM signal minimises the switching transition time and the associated switching losses. This paper presents a DC motor speed controller system using PWM technique. The PWM duty cycle is used to vary the speed of the motor by controlling the motor terminal voltage.The motor voltage and revolutions per minutes (RPM) obtained at different duty cycle rates. As the duty cycle increases, more voltage is applied to the motor. This contributes to the stronger magnetic flux inside the armature windings and the increasethe RPM. The characteristics and performance of the DC motor speed control system was investigated. In this paper, a PIC microcontroller and a DC-DC buck converter are employed in the DC motor speed controller system circuit. The microcontroller provides flexibility to the circuit by incorporating two push button switches in order to increase and to decrease the duty cycle rate. The characteristics and performance of the motor speed controller system using microcontroller was examined at different duty cycle rate ranging from 19% to 99%.

Reduce Adverse Effects of Laparoscopic Cholecystectomy with Pulse Width Modulated LED Light (625 nm, 76 Hz, 23% Duty Cycle)

2017 ◽  
Vol 35 (6) ◽  
pp. 293-299
Author(s):  
Alexander V. Redkin ◽  
Victor V. Vdovin ◽  
Victor M. Vakhtel ◽  
Pavel A. Lukyanovich ◽  
Natalia A. Malkina
Keyword(s):  
Laparoscopic Cholecystectomy ◽  
Adverse Effects ◽  
Duty Cycle ◽  
Pulse Width ◽  
Led Light ◽  
Pulse Width Modulated

scholarly journals A Novel Soft-Switching Synchronous Buck Converter for Portable Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-9
Author(s):  
Anup Kumar Panda ◽  
Swapnajit Pattnaik ◽  
K. K. Mohapatra
Keyword(s):  
Pulse Width ◽  
High Efficiency ◽  
Low Voltage ◽  
Buck Converter ◽  
Soft Switching ◽  
Pulse Width Modulated ◽  
Zero Voltage Switching ◽  
Overall Efficiency ◽  
Zero Voltage ◽  
Auxiliary Circuit

This paper proposes a zero-voltage-transition (ZVT) pulse-width-modulated (PWM) synchronous buck converter, which is designed to operate at low voltage and high efficiency typically required for portable systems. A new passive auxiliary circuit that allows the main switch to operate with zero-voltage switching has been incorporated in the conventional PWM synchronous buck converter. The operation principles and a detailed steady-state analysis of the ZVT-PWM synchronous converter implemented with the auxiliary circuit are presented. Besides, the main switch and all of the semiconductor devices operate under soft-switching conditions. Thus, the auxiliary circuit provides a larger overall efficiency. The feasibility of the auxiliary circuit is confirmed by simulation and experimental results.

Sign in / Sign up

Export Citation Format

Share Document