MPL-B4540F-SJ74AA

MPL-B4540F-SJ74AA

测量实际的相位电压，而不是基于直流链路测量和PWM占空比来估计相位电压，进一步提高了无传感器交流电机驱动器的性能。直接测量相位电压得到了更的结果，因为它包括了系统中的所有损失和PWM死时间失真的影响。

一种方法是测量直流导轨的所有三个相，用三个单极输入隔离放大器和一个隔离电源（如图3所示）为所有三个隔离放大器的高侧供电。另一种节省硬件成本的方法是只测量两个相对电压并计算第三个电压。这种方法只需要两个隔离的放大器与双极输入范围和在固件侧小的额外努力。这两个测量是

针对其中一个相位电压进行的，这需要供电的隔离来自顶部绝缘栅极双极晶体管（IGBT）的浮动高侧栅极驱动器电源的放大器，如图4所示。具有内部DC/DC转换器的设备，如AMC3330，地简化了电路，使额外的空间节省和更高的系统效率。

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