A type of inverter power supply based on harmonic elimination PWM control

In order to output sine wave with small degree of distortion and improve stability, a type of inverter power supply is designed based on harmonic elimination pulse-width modulation （PWM） control. The rectifier and filter are added to input circuit of the inverter. Single-phrase full-bridge inverter performs the function of converting direct current into alternating current （DC/AC）. In the control circuit, single chip micyoco （SCM） AT89C2051 is used for main control chip to accomplish the hardware design of the control system. A given value of output frequency of the inverter is input in the way of coding. According to the output frequency code which is read, SCM AT89C2051 defined harmonic elimination PWM control data which will be selected. Through internal timing control, the switches are switched under this provision of PWM control da-ta. Then the driving signals of the switches in the inverter are output from I/O of SCM AT89C2051 to realize harmonic elim-ination PWM control. The results show that adding Newton homotopic algorithm of harmonic elimination PWM control to corresponding software of the control system can make the quality of output voltage of the inverter higher and it will have broad application prospects.