A study for active filter using operating amplifier without harmonics of switching frequency

2003 ◽  
Author(s):  
N. Yamamura ◽  
R. Moriya ◽  
T. Hori
Keyword(s):  
Active Filter ◽  
Switching Frequency

scholarly journals Sliding Mode Control with Fixed Switching Frequency for Four-wire Shunt Active Filter

2011 ◽  
Vol 6 (5) ◽  
pp. 647-657 ◽  
Author(s):  
Farid Hamoudi ◽  
A. Aziz Chaghi ◽  
Hocine Amimeur ◽  
El Kheir Merabet
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Active Filter ◽  
Switching Frequency ◽  
Shunt Active Filter ◽  
Mode Control

CURRENT HARMONIC COMPENSATION USING PREDICTIVE CONTROLLERS

2004 ◽  
Vol 13 (05) ◽  
pp. 1065-1078 ◽  
Author(s):  
MOHAMMAD HAERI ◽  
KAMIAR KORDARI
Keyword(s):  
Power Quality ◽  
Design Method ◽  
Active Filter ◽  
Current Control ◽  
Switching Frequency ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Control Approach ◽  
Physical Constraints ◽  
Predictive Controllers

The power quality has become a major concern since late 1980's. There has been increasing interest in studying power quality problems, one of which is the existence of the current/voltage harmonics. In order to eliminate these harmonics, different methods have so far been proposed and developed. In this paper, line current harmonics reduction is achieved by using an active filter. More specifically, our aim is to introduce a proper control design method for the current control part of the active filter. To achieve the goal, two different predictive controllers are examined. Due to the existing physical constraints (switching frequency and computational limits) in real applications, a new predictive control approach is proposed. The performance of this controller is compared to those obtained by two existing predictive controllers as well as commonly used PI controller through computer simulations considering various circumstances.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

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