| The exhaust is one of the most main air pollution sources in modern cities with the total number of cars increases, also led to rapid consumption of non-renewable energy sources. In the environment of develop energy conservation and emission reduction and promote the development of a low-carbon economy, the electric cars get the attention and promotion that are examples of the new energy vehicles because of energy-saving ans environmental protection. At the same time, Related service area of electric cars need rapid development, there is need to build up the charging pile that in order to meet the demand for energy for electric cars, but the charging pile is not popularity yet,and build charging stations will take up a lot of land; there are vehicle-mounted chargers and vehicle-mounted inverters in the market, which are not only inefficient but also occupy the space of the car. the converter based on the same platform that can realize the multifunction and high efficiency is the development direction of the energy supply facilities in future.For the above situations, this thesis intends to research an advanced charging and discharge converter of the electric car battery pack: This converter has two main modes: charging mode and standby power mode. The converter can automatically switch between two modes based on the user’s needs. When the converter working in charging mode, the bidirectional PWM converter work for PFC rectifier, the DC after AC power rectifier work as the DC bus for the converter, bidirectional DC - DC converter working in the Buck converter mode at this time,the DC bus converted to the charging voltage of the battery pack. When the converter working in standby power mode, bidirectional DC - DC converter working in the Boost converter mode at this time, the battery electrical energy booster to constant DC voltage as the converter’s DC bus voltage,the bidirectional PWM converter work as inverter,the DC can be converted into pure sine AC power. This thesis mainly introduces the converter’s structure,technical specifications and IGBT model selection,calculation and analysis the IGBT and FWD’s power loss by bidirectional PWM converter and bi-directional DC - DC converter work on the charging mode or standby power mode under different working conditions; Using PSIM simulation software and hardware for test, the results of hardware test compared with the test data and waveform result of simulation, The test data and waveform results are in accordance with the design requirements of this study.This thesis analyzes the working principle and structure of the converter,the feasibility of this converter is proved by the comparison between experimental simulation and hardware test. When the electric car battery pack need charging, the converter is connected by cable to the standard municipal electrical and electrical outlet connection to the electric car battery pack for charging, achieve plug and play;The electric car battery pack is used as an standby power supply when the electrical cars driving in the outside or the family is power outage. |
