Sample records for dc amplifiers
from WorldWideScience.org

Sample records 1 - 2 shown.



1

Amplificador classe d para subwoofer/ Class D Amplifier for Subwoofer

Silva, Fabio V. R. da; Martins, Leandro dos S.; Vieira Júnior, João Batista; Coelho, Ernane A. A.; Freitas, Luiz Carlos de
2009-12-01

Resumo em português Este artigo apresenta uma topologia de amplificador Classe D de potência adequado para operar com sub-woofer. A estrutura proposta não necessita de fonte de alimentação estabilizada e filtro passa baixas de saída como ocorre com os amplificadores Classe D tradicionais. Um protótipo de 1 kW foi implementado em laboratório obtendo-se rendimento superior a 90 % e THD inferior a 1 %. Roteiro de projeto, princípio de operação e estratégia de controle também são apresentados. Resumo em inglês This paper proposal presents a high power Class-D audio amplifier for subwoofer applications with efficiency above 90%. A regulated dc voltage supply is not needed as well as a low pass output filter overcoming the disadvantages of ordinary Class-D audio amplifiers structures. A 1 kW laboratory prototype was implemented and it was found that efficiency above 90 % and THD below 1 % could be achieved. Detailed design guide lines, principle of operation analysis and control strategy are also included in this paper proposal.

Scientific Electronic Library Online (Portuguese)

2

Time-domain optimization of amplifiers based on distributed genetic algorithms

Tavares, Rui Manuel Leitão Santos

Thesis presented in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the subject of Electrical and Computer Engineering Portuguese Foundation for the Science and Technology (FCT) The work presented in this thesis addresses the task of circuit optimization, helping the ...

DRIVER (Portuguese)