面向多旋翼重载无人机均流技术优化研究CSCD

多旋翼重载无人机的应用需要大功率的无刷直流电机为其提供升力。金属-氧化物半导体场效应晶体管(MOSFET)和绝缘栅双极型晶体管(IGBT)等开关器件可以通过并联提供更大的电流容量,以满足大功率的需求。然而,由于杂散电感、器件特性的变化和印制电路板(PCB)布局的不对称等原因,并联开关器件将出现不平衡电流,这可能会对系统造成损坏。为解决此问题,使用Multisim软件搭建仿真电路,测量2个并联MOSFET之间的电流,分析不平衡电流产生的具体原因,并提出了一种采用栅极串联均流电阻联合耦合电感的MOSFET并联电流均衡方法,最后通过仿真和实验验证了该方法的可行性。与串联均流电阻法和耦合电感法相比,此方法能使导通电流保持均衡,更好地提高系统的可靠性。

Research on Optimization of Current Sharing Technology for Multi-Rotor Heavy-Duty Drone

The application of multi-rotor heavy-duty drone requires a high-power brushless DC motor to provide lift for it. Switching devices such as Metal-Oxide-Semiconductor Field-Effect Transistor(MOSFET) and Insulated Gate Bipolar Transistor(IGBT) can be connected in parallel to provide greater current capacity, which can meet high-power requirements. However, due to stray inductance, changes in device characteristics and asymmetry of Printed Circuit Board(PCB) layout, parallel switching devices can have unbalanced current, which may damage the system. To solve this problem, this paper uses Multisim software to build a simulation circuit, and measures the current between two parallel MOSFET. The specific causes of unbalanced current are analyzed, and a method for MOSFET parallel current equalization using gate series current-sharing resistance combined with coupled inductance is proposed. At last, the feasibility of this method is verified by simulation and experiment. Compared with the series current-sharing resistance method and the coupled inductance method, this method can keep the conduction current balanced, which can better improve the reliability of the system.