关键的控制信号SPWM的脉冲宽度采用中值规则采样法来求取。
The pulse width of the key control signal SPWM is acquired by the sampling method based on median rule.
在分析了SPWM调制原理的基础上，提出了改进型的规则采样法产生SPWM波。
After analyzing basic principle of SPWM, this thesis proposes a modified version of rule sampling method.
实验表明采用对称规则采样法产生的SPWM 波形，具有速度快、变频方便等优点。
The experimental results show that symmetry rule sampling method has advantages of fast speed and converting frequency easily.
自然采样法产生的SPWM脉冲效果最接近正弦波，但工程中不利于实时控制，在实际中常采用的规则采样法精度不够高。
As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control, the regular sampling method with poor precision is usually adopted in practical projects.
本论文所论述的系统采用MSP430F149单片机通过不对称规则采样法来输出高精度的三相spwm波形，从而实现了逆变器的SPWM控制。
The system adopts MSP430F149 MCU and asymmetry regular-sampling strategy to output high precision SPWM wave, consequently transducer's SPWM control is realized.
本论文所论述的系统采用MSP430F149单片机通过不对称规则采样法来输出高精度的三相spwm波形，从而实现了逆变器的SPWM控制。
The system adopts MSP430F149 MCU and asymmetry regular-sampling strategy to output high precision SPWM wave, consequently transducer's SPWM control is realized.
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