Drivetrain-Integrated DC-DC Converter for 48 V Network Vehicles

由于内燃机（ICE）车辆的进一步电气化，电力需求不断增加，使12v电源达到了极限。因此，各大汽车制造商已同意实施新的双电压网络。48v电池用于为启动发电机和其他高功率组件供电，而低功率组件则由12v电池供电。在这些网络之间放置一个双向dc-dc转换器，以便48v发电机可以为12v系统充电，12v跳车启动器可以启动汽车。本研究项目的目的是研究和展示一种新的驱动拓扑和控制算法，以消除12v网络和48v网络之间的dc-dc转换器。所提出的拓扑结构类似于传统的六桥逆变器拓扑结构。此外，机器的星点通过不对称半桥连接到12v电池。零序电流通过机器在两个网络之间传递电力。初步分析表明，可以对传统的磁场定向机控制器进行扩展，使其能够控制两块电池之间的功率流。电池之间的功率传输与机器速度无关，因此集成的dc-dc转换器也可以在机器运行和产生扭矩时运行。在项目范围内，将建立系统的详细仿真模型，以证明该拓扑的可行性，并将该拓扑的性能与传统dc-dc转换器的性能进行比较。将建立一个功能齐全的原型，并通过实验验证仿真结果。

Increasing power demand due to further electrification of internal combustion engine (ICE) vehicles has taken the 12 V power supply to its limits. Therefore, major automobile manufacturers have agreed to implement a new twin-voltage network. A 48 V battery is used to power the starter-generator and other high power components, while low power components are fed from a 12 V battery. A bidirectional dc-dc converter is placed between these networks so that the 48 V generator can charge the 12 V system and a 12 V jump starter can start the car.The objective of this research project is to investigate and demonstrate a novel drive topology and a control algorithm that eliminate the dc-dc converter between the 12 V network and the 48 V network. The proposed topology is similar to a conventional six-bridge inverter topology. Additionally, the star point of the machine is connected to the 12 V battery via an asymmetrical half bridge. The zero sequence current through the machine transfers power between the two networks. Preliminary analysis shows that the conventional field-oriented machine controller can be extended such that it can control the power flow between the two batteries. The power transfer between the batteries is independent of the machine speed, therefore the integrated dc-dc converter can also operate when the machine is running and producing torque.Within the scope of the project, a detailed simulation model of the system will be built to prove the feasibility and to compare the performance of this topology with the performance of a conventional dc-dc converter. A fully functional prototype will be built and tested to confirm the simulation results through experiments.