用于非车载充电机移动检测的轻量化可控充电负载

Lightweight Controllable Charging Load for Motion Detection of Electric Vehicle Off-Board Charger

目前,电动汽车非车载充电机现场检测时所用的电阻箱和电子负载自身体积大、重量重,导致了在某些检测场合使用受限。假如直接利用移动检测车辆的车载动力电池包作为充电负载,其充电模式单一且电动势不能灵活设置,会导致充电时间长、效率低。针对这些问题,提出了采用移动检测车辆的车载动力电池包级联直流变换器组成轻量化可控充电负载的拓扑方案,研究了输入恒压、恒流、恒功率以及恒电阻等闭环反馈控制方法,实现了输入恒压、恒流、恒功率以及恒电阻等典型工作模式,且在额定范围内具有连续调节的能力;在满足充电负载轻量化的同时,实现对非车载充电机的自主测试。最后论文建立了Matlab-Simulink仿真模型,验证了所提拓扑结构的可行性和控制方法的有效性。

At present,the resistance box and the electronic load used in the on-site detection of the EV off-board charger are large in size and heavy in weight which results in the limited use in some detection occasions.If the power battery pack of the mobile detection vehicle is directly used as the charging load,the charging mode is single and the electromotive force cannot be flexibly set,which results in long charging time and low efficiency.Aiming at these problems,this paper proposes a topological scheme that the lightweight controllable charging load consists of a vehicle-mounted power battery pack with a cascaded DC/DC converter,researches the double closed loop control methods such as constant input voltage,constant input current,constant input power and constant resistance of load,then achieves the typical working modes including constant input voltage,constant input current,constant input power and constant resistance of load.The operating modes has the ability to continuously adjust in the rated range.In a word,the proposed scheme can achieve self-test of the off-board charger while reducing the weight of the charging load.Finally,the simulation model in Matlab/Simulink is established to verify the feasibility of the proposed topology and the effectiveness of the control methods.