中文摘要：

采用SPWM的三相逆变技术在调速传动、电源转换和电力电子控制领域均有着广泛的应用，为提高三相SPWM产生的效率和精度，在此设计了一种不对称规则采样的三相SPWM发生器。调制正弦信号采用改进型迭代算法CORDIC产生，相对于查表法，无需占用大量的存储器空间，利用等腰三角波与调制正弦波相比较的不规则采样，得到SPWM的输出信号，并于Quartus Ⅱ编译环境下采用Verilog HDL硬件描述语言实现模块化编程设计，进行波形仿真验证了该设计的高效性和高精度性。该设计适用于高精度的三相逆变系统，也可与其他模块相结合应用于各种三相电机的正弦驱动等场合。

英文摘要：

SPWM？based three？phase inversion technology is widely applied in many areas,such as speed governing trans？mission,power switching and power electronics control. A three？phase SPWM generator which samples with asymmetry rule is designed in the paper to improve the accuracy and efficiency of the three？phase SPWM. The modulation sinusoidal signal is achieved by an improved iterative algorithm CORDIC,which dispenses with occupation of a lot of memory space as the LUT does. The output signal of SPWM is obtained by comparing the irregular sampling of isosceles triangle wave and modulation sine wave. The modular programming design is realized via Verilog HDL under the Quartus ii compiler platform. The efficiency and accuracy of the design were verified by waveform simulation. The design is suitable for high？precision three？phase inverter sys？tem and can also be combined with other modules to be applied to sinusoidal drive of various three？phase motors.