Research And Development On Digital Soft-switching Electroplating Power Supply Based On DSP

Plating on the substrate surface decoration, protection and access to certain special properties of a surface engineering technology, play a great role in machinery, electronics, aerospace, and other various aspects of the national economy. The current density and the wave are the key indicators, affecting coating quality and efficiency of electroplating. Therefore, electroplating power as a major key to the electroplating industry equipment, its design is reasonable and directly related to the quality of coating, plating tank capacity, energy consumption , investment benefits, and many other factors.At present electroplating power has developed to the fourth generation---high-frequency switching power supply, with high efficiency and energy saving, light weight, small size, good dynamic performance, and many other notable features, and is conducive to the realization of process automation and intelligent control, compared to previous generations plating supply it with a leap in quality.. However, from a technical point of view, the current switch plating is still mainly confined to hard power switch mode and transform analog control, reliability, electromagnetic compatibility (EMC) and the structure and process intelligence, and so has obvious limitations.Switching hard way lead in the loop current and voltage greater stress, resulting in greater EMC problems, which has been growing attention to environmental protection in the modern society has become increasingly can not be ignored, and in the process of switching hardware of the deterioration of the oscillation The switch of working conditions, exacerbated by switching losses and reduce the reliability of the system itself.. So it is necessary to study more advanced soft-switch technology, softening the switching process of switching power supply, reducing the switch voltage and current stress, reduce switching losses, continue to improve the efficiency of high-frequency switching power supply , enhance system reliability, and to some extent Solve the high-power switch electroplating power electromagnetic compatibility problems. This paper concluded high-frequency soft-switch technology transformation on the basis of the development process, the design proposal uses full-bridge phase-shift zero-voltage circuit soft-switch topology, detailed analysis of its work mechanism, the main circuit design and component selection, and enhanced under the current principle to join the auxiliary resonant network to broaden the scope of soft-switch and reduce by-side of Space than the loss.Analog control is the electroplating technology mainstream. However, with the number of chips more cost-effective, and its stability, flexibility, intelligence and other performance analog chips is second to none, with the great potential to replace analog chips. This thesis in contrast MCU and DSP on the basis of the merits and drawback of the control circuit design to the choice of TI company's DSP chips TMS320LF2407A as the core, a DSP design minimum system, feedback signal conditioning circuit and PWM drive and protection circuit, And to study suitable for switching power supply a controlled manner and method, using assembly language to achieve full-bridge phase-shift soft-switching circuit of software programming. Finally, manufactures the prototype and carries on the experiment, obtains conforms to the galvanization technological requirement output wave shape.