The Design Of Switching Power Supply Based On The Digital Control

This paper analyses the requirement of lab research electrical source according the practical demanding, and introduces the meaning of digitally electrical source by comparing the recent electrical source in the market.This paper introduces the principle of BUCK and analyses the topology structure of the main power conversion circuit. According to the designing demanding, this paper introduce the topology structure of multiply output and chooses the main circuit topology structure as mentioned in the paper. To driving and protection technology and the selection of power tube, this paper introduces the principle of driving circuit. In addition, this paper analyses the protection principle of MOSFET and presents two ways of selecting parameters of RCD and concrete experimental results.Because of the key factors of nice output, this paper analyses several ways of output in low ripples and the effectiveness from the two-stage filter circuit in the model of small-signal. Finally, this paper selects the way of BUCK two-stage filter circuit in order to low down pick-to-pick amplitude of the ripples. This paper experienced large number of experiments to obtain waveform and it turned out that this way can need the demanding of design.The digitally electrical source plays an importance part in the research. Traditional simulation method cannot meet the modern concept for the designing of electrical source. This paper adopts the TMS320F2812DSP from TI which constitutes the control system of the whole electrical source. The machine debugging and testing prove that the electrical source in the paper can meet the demanding of lab electrical source.