6SL3353-3AE38-4AA0
在这一“集成智能”系列中,我将介绍BLDC电机的不同性能要求并探索是什么使TI集成电机驱动器“智能化”。在第一部分中,我将详细介绍汽车应用中BLDC系统的 EMI管理。
BLDC电机是在10-100kHz的高开关频率下驱动的。在如此高的频率下,高dv/dt和寄生电感的组合会在开关节点上引起高频振铃。而这种振铃会发出高频噪声,会干扰汽车中的其他元件。
如图2和图3所示,调整施加电压的压摆率有助于减少由振铃引起的干扰。在分立系统中,调整栅极驱动器电阻会改变电压的压摆率。您手动更改电阻器阻值并根据测试结果选择佳值。手动更改电阻器的过程繁琐,需要多次迭代PCB,增加整体尺寸和复杂性。
对于DRV10983-Q1等集成驱动器而言,栅极电阻器不可访问且无法更改,不过这不是一件坏事。例如,DRV10983-Q1中集成了压摆率控制功能,您可通过更改寄存器值轻松更改压摆率,从而加快模块 EMI 测试的整体进度。
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