Power Electronics Electrônica de Potência Página do Eng. Armando Cavero Miranda

No Blog Eletrônica de Potência você encontrará informações sobre teses,artigos,seminarios,congressos,tecnologias,cursos,sobre eletrônica potência. “TEMOS O DESTINO QUE MERECEMOS. O NOSSO DESTINO ESTA DE ACORDO COM OS NOSSOS MERITOS” ALBERT EINSTEIN. Imagination is more important than knowledge, for knowledge is limited while imagination embraces the entire world. EL FUTURO SE CONSTRUYE HOY,EL SUCESSO NO ES FRUTO DE LA CASUALIDAD,SE HUMILDE ,APRENDE SIEMPRE CADA DIA.

quinta-feira, 6 de fevereiro de 2014

Study on Mode Transition Instability in PFM/PWM Dual-mode Circuit

Study on Mode Transition Instability in

PFM/PWM Dual-mode Circuit

Study on Mode Transition Instability in PFM/PWM Dual-mode Circuit Zhang Fan Dept. of Electronic Systems Graduate School, Hanyang University Abstract To obtain higher efficiency PFM/PWM dual-mode control is widely used for DC-DC converters. Pulse width modulation (PWM) control shows high conversion efficiency for heavy load range in DC-DC converter. On the other hand, pulse frequency modulation (PFM), according to its effective switching frequency variation proportion to the load, is adopted for high efficiency in light load condition. But some serious jitter in switch control signal is brought out during the mode transition in PFM/PWM dual-mode control. The jitter can cause system instability. In this thesis, a stable mode transition circuit based on Schmitt trigger is designed to solve the problem.