Design Of Emergency Ventilated Converter For Metro Vehicle

On the basis of studying demestic ventilation system in metro and development of VVVF technology, a subway emergency ventilation converter is designed, which is used for ventilation inside compartment when MTR power supply failures.The main power circuit uses the series combination of a single-stage boost circuit and voltage three-phase full-bridge inventer circuit. The IPM module 6MBI50-120 is adopted as the switching device of inverter circuit. The circuit modules such as supporting power supply module, Boost circuit module, protecting circuit module are discussed, the construction and function of all the circuits are analysed. The features of transformer and Boost circuit are calculated.The system control circuit is established by the main framework including SCM AT89S52 and three-phase SPWM generator SA8281. The generation and dead time of SPWM wave are researched.Aiming at the output voltage harmonics of SPWM constant frequency converter, a system output filter is designed, the output harmonic problem of emergency ventilation converter is resolved.The specimem of the emergency ventilation converter is designed. The results of experiment are got and analysed.