Study & Development Of PWM Mode Switching Power Supply Based On DSP

The traditional high-voltage DC power-supply, which usually can be got by boosting 220V 50Hz AC voltage with transformer and then going through rectifier with filter, has big bulk and weight, high ripple coefficient of output voltage, low stability and efficiency. Study and development of high-frequency high-voltage direct current power-supply ,which uses switching power-supply technology to design novel high frequency high voltage switching power supply with small bulk and weight, high stability and efficiency ,is discussed in the paper. Primary converter is a full-bridge converter constructed by ZVS PWM DC/DC which makes full use of the transformer's leak inductance to carry out soft switching. This paper also analyzes the theory and tactic of this kind of circuit, and presents the concrete design parameter;simulation and experiment waveform.High-voltage insulation is implemented using series of two transformers. In order to achieve ideal output voltage, bi-directional voltage doubling rectifier is applied in terms of high voltage and system stability. The controlling core of the power supply system is based on Digital Signal Processor TMS320LF2407 to fulfill ZVS PWM DC/DC full-bridge converter, output voltage regulation, overvoltage protection and overcurrent protection which protect the system from possible destruction.Also,it is easy ,one hand, for customers to update the whole system through the control arithmetic , and, on the other hand ,the customers can choose different functions in light of their different needs.IR2110 is employed in driving circuit to drive the IGBT of full-bridge converter.Module power supply is utilized to produce different DC voltage including 3.3V,1.8V, ± 12V,15V needed by DSP and other integrated circuit chips. This paper also makes an analysis on the electromagnetic interference of the power supply and takes some measures to reduce this kind of electromagnetic interference.The power of the power-supply is 200W. The switching frequency is 80 kHz. Output of DC high-voltage power-supply which can be controlled and adjusted by DSP is 10kV. The ripple coefficient is no more than 0.5%. The efficiency of the power-supply system is more than 85%.