scholarly journals Switched Capacitor Compensation of Supply Distortion in Class-D Amplifiers

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2197
Author(s):  
Milan Ponjavic ◽  
Sasa Milic
Keyword(s):  
Hardware Implementation ◽  
High Efficiency ◽  
Low Cost ◽  
Maximum Energy ◽  
Switched Capacitor ◽  
Static Characteristics ◽  
Simple Circuit ◽  
Class D Amplifier ◽  
Class D ◽  
Principal Design

This paper presents a switched capacitor technique for bus-pumping compensation in a half-bridge class-D amplifier. The proposed approach, in addition to the almost complete reduction of the bus-pumping effect, allows the half-bridge class-D amplifier to preserve maximum energy efficiency. The studied hardware implementation of the proposed technique demonstrates its advantages of high efficiency, simple circuit, and low cost. The principal design and operating principles are analyzed and described. The experimental static characteristics and time-domain waveforms for the proposed technique are shown to verify its feasibility.

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.

GaN HEMT based high-efficiency current-mode class-D amplifier using chip-on-board technique

2011 ◽  
Vol 54 (2) ◽  
pp. 358-362 ◽  
Author(s):  
Jun-Chul Park ◽  
Chan-Sei Yoo ◽  
Wonshil Kang ◽  
Dongsu Kim ◽  
Jong-Gwan Yook ◽  
...  
Keyword(s):  
High Efficiency ◽  
Current Mode ◽  
Gan Hemt ◽  
Class D Amplifier ◽  
Class D

Study of Harmonic Suppression Method Based on the Class D Amplifier

2013 ◽  
Vol 273 ◽  
pp. 384-388
Author(s):  
Yu Guo ◽  
Wei Li
Keyword(s):  
Power Amplifier ◽  
Integrated Circuit ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Harmonic Suppression ◽  
Output Terminal ◽  
Class D Amplifier ◽  
Class D ◽  
Small Distortion ◽  
Harmonic Components

Class D power amplifier has the advantages of simple structure, small volume, high efficiency, large output power, and small distortion, therefore is applied widely in the audio power amplifier integrated circuit. But because of existing higher harmonic components, the total harmonic distortion (THD) is high. In this paper, for the characteristics of class D amplifier, a feed-forward control circuit is added to the amplifier output terminal, and a composite filter is used to inhibit output harmonics further. The simulation results show that, the method can reduce the system THD effectively and improve the performance of the amplifier.

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