Three Phase Programmable Power Supply Based On MCU And DSP

This paper discussed a design process of the programmable power supply based on MCU and DSP. AM, FM and PM can be easily applied to the three-phase AC signal by the experiment of samples. The analysis of waveforms obtained from the experiment was shown.The system implement the function of FM and PM by select the AD9832 produced by ADI as signal producer; and implement the function of AM by controlling the full-scale DAC current of the AD9832 with 12 bits ADC integrated in the DSP. The original signal with the function of PM, FM and AM has low power but much harmonic. There will be a part of filter before power amplifing. No only do the signal power amplify, until it rechieve the goal of THD.The most difficult part is to filter harmonic. The spectrum analysis obtained from Matlab show that the THD will not get the goal of -40dB until through a bandpass filter. MAX7400 and MAX7490 produced by Maxim company will be selected to implement the function of filter.