A Continuous Conduction mode/Critical Conduction Mode Active Power Factor Correction Circuit with Input Voltage Sensor-less Control

Abstract An active power factor correction (PFC) circuit is presented which employs a newly proposed input voltage sensor-less control technique operated in continuous conduction mode (CCM) and critical conduction mode (CRM). The conventional PFC circuit with input voltage sensor-less control technique degrades the power factor (PF) under the light load condition due to DCM operation. In the proposed PFC circuit, the switching frequency is basically 70KHz in CCM operation. In light load condition, however, the PFC circuit operates in CRM and the switching frequency is increased up to 200KHz. So CCM/CRM operation of the PFC circuit alleviates the decreasing of the PF in light load condition. The proposed PFC controller IC has been implemented in a 0.35μm BCDMOS process and a 240W PFC prototype is built. Experimental results shows the PF of the proposed PFC circuit is improved up to 10% from the one employing the conventional CCM/DCM dual mode control technique. Also, the PF is improved up to 4% in the light load condition of the IEC 61000-3-2 Class D specifications.
DOWNLOAD FULL PAPER LINKS
https://www.mediafire.com/?21j1gpjbrm9tki6

http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/ieek/DHJJQ3/2013/v50n8/DHJJQ3_2013_v50n8_151.pdf

H-BRIDGE CONVERTER WITH ADDITIONAL SWITCH LEGS AND ITS APPLICATION TO AC-DC AND DC-AC CONVERSIONS

Abstract This dissertation proposes a new topology H-bridge converter with additional switch legs (HA converter). The proposed topology has simple circuit structure with expandability and flexibility. With six semiconductor devices and single inductor, the topology is capable of operating as buck, boost, and buck-boost converter. Theoretically, it demonstrates low common mode current and electromagnetic interference (EMI) by solidly connecting grounds of input and output terminals. The proposed topology is advantageous not only in grid-connected power conversion application but also in standalone power system such as electric vehicle, because these systems include large parasitic capacitances and are prone to high common mode EMI due to the wide mechanical structure of the conductor.
LINK THESIS
https://www.mediafire.com/?cmoqphbgd384328

Mercado de iluminação em desenvolvimento no BRASIL REVISTA O SETOR ELETRICO

Edição 93 - Outubro de 2013 Mercado de iluminação em desenvolvimento De acordo com a pesquisa publicada a seguir, o grau de satisfação dos consumidores com a qualidade dos produtos de iluminação disponíveis no mercado é baixo ou regular. A boa notícia é que, no caso dos Leds, a certificação compulsória já está a caminho Mais do que iluminar, os sistemas de iluminação devem prezar por requisitos que ganham cada vez mais importância no mundo moderno: qualidade e eficiência energética. Para se ter uma ideia, a pesquisa publicada, a seguir, consultou fabricantes e consumidores de equipamentos para iluminação e identificou que os usuários estão mais preocupados com a qualidade dos produtos que estão sendo disponibilizados no mercado. Na opinião dos consumidores, os equipamentos de iluminação encontrados não atendem plenamente às exigências do mercado. 69% dos entrevistados deram nota 6 ou 7 para o grau de satisfação com este setor. A pesquisa apurou ainda que, na opinião dos consumidores, garantia do fabricante, disponibilidade de informações técnicas e ter o selo Inmetro são os principais critérios considerados na hora de comprar ou especificar um produto de iluminação. Questionados quanto à tendência deste mercado, o Led, 59% dos usuários que participaram do levantamento afirmaram que esta será a principal fonte luminosa em até dez anos.
Clique aqui para fazer o download da pesquisa na íntegra.
LINK ARTIGO COMPLETO
http://www.osetoreletrico.com.br/web/documentos/guias_setoriais/ed-93_Pesquisa-Equipamentos-para-iluminacao.pdf

Reduction of Radiated Electromagnetic Interference in 4-Phases Pulse Width Modulation Converter System Hee-Jung Kim Yonsei University Department of Electrical and Electronic Engineering

Reduction of Radiated Electromagnetic Interference in 4-Phases Pulse Width Modulation Converter System A Master’s Thesis Submitted to the Department of Electrical and Electronic Engineering and the Graduate School of Yonsei University in partial fulfillment of the requirements for the degree of Master of Electrical and Electronic Engineering
LINK THESIS
https://www.mediafire.com/?wyilxbll1skbos9

GRANDE DATA CENTER BANCO SANTANDER CONQUISTA PRIMEIRA CERTIFICAÇÃO TIER IV DA AMÉRICA LATINA

FONTE ORIGINAL
http://www.arandanet.com.br/midiaonline/rti/2013/novembro/index.html