Research on inverter control system based on bipolar and asymmetric regular sampled SPWM

The inverter control system based on the bipolar and asymmetric regular sampled SPWM is researched in this paper The system chooses TMS320F2812 as its core of control. Thanks to its 6 outputs of PWM, which are divided into 3 groups, the changing law of the duty ratio is the same as the sine and helps to control the MOSFETs´ statuses. In this research, the design of the hardware circuit of the inverter control system is given, the program codes are written under the environment of CCS according to the generation principle of SPWM, and the corresponding outputs of PWM pins are recorded. Finally, because all conditions with high control accuracy satisfy concurrent control and seamless shifting, the system achieves the goal that the revolving speed of the single-phase asynchronous motor is controlled in a variable frequency way.