Research And Design Of Half-Bridge LLC Resonant Type Vehicle Charger Power Supply

With the rapid development of the global economy, fuel type of the motor vehicles are increasing, energy consumption and environmental pollution problems became more and more prominent. In recent years, most countries are reseraching in the development of electric vehicles, which becomes one of the effective methods to solve these problems. As the core equipment of the electric cars, car charger influences the relationship between grid and battery energy transmission. Research and design a good performance of the car charger can not only improve battery life of the electric car and improve the performance of the electric but also save energy and reduce pollution, which has a great significance to promote the electric car.As a power electronic device,the develop of the car charger also towards miniaturization, lightweight, high power density, besides the charger directly connected to the power grid, which puts forward higher request of the power factor and efficiency as well as the ripple of input voltage, therefore, the control methods and topology should be selected appropriatly.According to the design requirements, a half bridge resonant car charger has been developed, which has two levels of topology structure and levels before APFC and after the HB-LLC. According to the advantages and disadvantages of each topology structure, there are many kinds of topology structure of APFC, choosing BOOST APFC to work in the mode of CCM and the topology can achieve wide range of input voltage and high power factor. The DC-DC converter works in resonance method and on the basis of the traditional half bridge circuit to join the resonant tank network, which works in PFM control mode to adjust output voltage.Using saber simulation software do some closed-loop simulation analysis of APFC and HB-LLC. A sample car charger has been developed whit the power of 1000 W, and AC voltage input range AC90V~AC264V, DC voltage output range DC60V~DC90V, rated output voltage DC84 V. Charger for debugging and related tests, the experimental waveforms and data is presented.Finally, the experimental data and waveform were analyzed which meet the requirements of design index, verifying the feasibility of simulation and theory.