A Low-Distortion High-Efficiency Class-D Audio Amplifier Based on Sliding Mode Control

2016 ◽  
Vol 63 (8) ◽  
pp. 713-717 ◽  
Author(s):  
Ahmed I. Hussein ◽  
Ahmed Nader Mohieldin ◽  
Faisal Hussien ◽  
Ahmed Eladawy
Keyword(s):  
Sliding Mode Control ◽  
High Efficiency ◽  
Sliding Mode ◽  
Mode Control ◽  
Audio Amplifier ◽  
Class D ◽  
Low Distortion

A High-Efficiency Cascade Multilevel Class-D Amplifier

2012 ◽  
Vol 482-484 ◽  
pp. 559-564
Author(s):  
Guo Hua Xu ◽  
Ying Zhang ◽  
Ming Dong ◽  
Lu Wei Xu
Keyword(s):  
Sliding Mode Control ◽  
Power Amplifier ◽  
High Efficiency ◽  
Sliding Mode ◽  
Mathematic Model ◽  
Total System ◽  
Mode Control ◽  
Class D Amplifier ◽  
Class D ◽  
The Individual

A switch-mode power amplifier based on a cascaded multicell multilevel circuit topology is introduced in the paper. Due to the Carrier-Based phase-shifted modulation of the individual switching cells, the output voltage ripple of the total system is considerably small. Compared with traditional class- AB amplifiers that are very poor at efficiency, the proposed amplifier has the efficiency of 90% at the smaller distortion level. A multilevel class-D amplifier’s mathematic model is analyzed. The paper lays emphasis on the design of the sliding mode control and deducts the parameters, and then develops a 2kW cascade multilevel class-D power amplifier adopting sliding mode control. The research results show that this kind of amplifier increases the system bandwidth, which provides the system with fast following performance and stability, high efficiency, and low THD value of output signals.

scholarly journals Design and Implementation of High Order Sliding Mode Control for PEMFC Power System

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4317 ◽  
Author(s):  
Mohammed Yousri Silaa ◽  
Mohamed Derbeli ◽  
Oscar Barambones ◽  
Ali Cheknane
Keyword(s):  
Fuel Cells ◽  
Sliding Mode Control ◽  
High Efficiency ◽  
Sliding Mode ◽  
High Reliability ◽  
High Order ◽  
Proton Exchange ◽  
Lyapunov Theory ◽  
Variable Load ◽  
Mode Control

Fuel cells are considered as one of the most promising methods to produce electrical energy due to its high-efficiency level that reaches up to 50%, as well as high reliability with no polluting effects. However, scientists and researchers are interested more in proton exchange membrane fuel cells (PEMFCs). Thus, it has been considered as an ideal solution to many engineering applications. The main aim of this work is to keep the PEMFC operating at an adequate power point. To this end, conventional first-order sliding mode control (SMC) is used. However, the chattering phenomenon, which is caused by the SMC leads to a low control accuracy and heat loss in the energy circuits. In order to overcome these drawbacks, quasi-continuous high order sliding mode control (QC-HOSM) is proposed so as to improve the power quality and performance. The control stability is proven via the Lyapunov theory. The closed-loop system consists of a PEM fuel cell, a step-up converter, a DSPACE DS1104, SMC and QC-HOSM algorithms and a variable load resistance. In order to demonstrate the effectiveness of the proposed control scheme, experimental results are compared with the conventional SMC. The obtained results show that a chattering reduction of 84% could be achieved using the proposed method.

Research on trajectory planning of closed loop grouting robot

2021 ◽  
Vol 13 (11) ◽  
pp. 168781402110534
Author(s):  
Runmei Zhang ◽  
Rui Ren ◽  
Guan Luo ◽  
Shuai Li ◽  
Lijun Bi ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Trajectory Planning ◽  
Closed Loop ◽  
High Efficiency ◽  
Control Method ◽  
Sliding Mode ◽  
Three Dimensional ◽  
Adaptive Sliding Mode Control ◽  
A Algorithm ◽  
Mode Control

In order to promote building intelligence and solve the disadvantages of traditional grouting technology, the trajectory planning of closed-loop grouting robot was designed. The minimumsnap optimization function was used to optimize the A* algorithm to realize the 2D trajectory planning, which could obtain a smooth, continuous route, and planning diagram of time distribution, speed, acceleration, and jerk. Further, the weight function of the improved A* algorithm was adjusted to perform 3D trajectory planning to reduce redundant nodes in the route. A new approaching law adaptive sliding mode control method was used to achieve precise trajectory tracking of the robotic arm and reduce the problem of chattering in sliding mode control. Through the design of closed-loop grouting robot and the research of trajectory planning, the two-dimensional and three-dimensional paths of grouting robot could be optimized. The system could realize automatic grouting operation. It could promote the development of high efficiency and safety in the construction grouting industry.

scholarly journals A New Adaptive Control for Five-Phase Fault-Tolerant Flux-Switching Permanent Magnet Motor

2016 ◽  
Vol 2016 ◽  
pp. 1-14
Author(s):  
Hongyu Tang ◽  
Wenxiang Zhao ◽  
Chenyu Gu
Keyword(s):  
Adaptive Control ◽  
Sliding Mode Control ◽  
Permanent Magnet ◽  
High Efficiency ◽  
Control Method ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Backstepping Method ◽  
Control Laws ◽  
Mode Control

The five-phase fault-tolerant flux-switching permanent magnet (FT-FSPM) motor can offer high efficiency and high fault-tolerant capability. In this paper, its operation principle is presented briefly and its mathematical model is derived. Further, a new adaptive control for an FT-FSPM motor, based on the backstepping method and the sliding mode control strategy, is proposed. According to the backstepping method, the current controllers and voltage control laws are designed to track the speed and minimize the current static error, which enhance the dynamic response and the ability to suppress external disturbances. In order to overcome the influence of parameter variations, according to sliding mode control theory, the virtual control variables and the adaptive algorithm are utilized to approach uncertainty terms. Three Lyapunov functions are designed, and the stability of the closed-loop system is analyzed in detail. Finally, both simulation and experimental results are presented to verify the proposed control method.

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