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发明授权
CN101252323B 用来减少电驱动器中的PWM电压失真的方法和设备 有权

用来减少电驱动器中的PWM电压失真的方法和设备
摘要：
本发明公开了用来减少电驱动器中的PWM电压失真的方法和设备。所述方法包括：接收具有一定占空比的第一信号，所述占空比具有在最小与最大可实现占空比之间的范围；如果所述占空比处在失真范围之内并且小于第一限幅值，则基于所述最小可实现占空比来产生第二占空比；如果所述占空比处在所述失真范围之内并且处在第一与第二限幅值之间，则基于所述最小和最大脉宽当中的更接近的那一个来产生第二占空比；如果所述占空比处在所述失真范围之内并且大于第二限幅值，则基于所述最大可实现占空比来产生第二占空比；以及把具有第二占空比的第二信号发送到所述电压源逆变器。
摘要（英）：

Methods and apparatus are provided for reducing voltage distortion effects at low speed operation in electric drives. The method comprises receiving a first signal having a duty cycle with a range between minimum and maximum achievable duty cycles, producing a second duty cycle based on the minimum achievable duty cycle if the duty cycle is within a distortion range and less than a first clippingvalue, producing a second duty cycle based on the closer of minimum and maximum pulse widths if the duty cycle is within the distortion range and between the first and a second clipping value, producing a second duty cycle based on the maximum achievable duty cycle if the duty cycle is within the distortion range and greater than the second clipping value, and transmitting a second signal to the voltage source inverter having the second duty cycle.

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