Study of the standard sine wave frequency conversion power supply based on analog and digital integrated control

In this article, a standard sine wave frequency conversion power supply based on analog and digital integrated control is proposed. First of all, the article introduces the topology structure and principle involved in this frequency conversion power supply. The system of frequency conversion power supply was designed based on the DSP2812[1] made by TI company. Next, it is stated that the method of analog-digital combination control simplifies the inexact algorithm, under the digital control, of calculating the carrier wave and the PWM driving signal of power device generation at the point of modulation wave intersection. In addition, it is also stated that the analog-digital integration control is equipped with a good performance in dynamic control response and a harmonic content that can effectively drop down the output voltage of the controller; the analog-digital integration control can realize the required motor control performance at a low cost, improve the operation efficiency of the motor, and suppress various secondary harmonic currents of the motor. At the end, the voltage and the input waveform of the electric currents of the system are under analyzed through a test simulation experiment on the power source of the variable frequency power supply system; at the same time, the input voltage waveforms corresponding to different frequencies are also involved in discussion, while the corresponding harmonic waves are analyzed.