The Practical Application Of Pulse Power Supply In PCB Plating

Along with electronics industry swift development, the electronic products price reduces, volume reduces, reliable enhancement. As a result of the printed circuit boards volume reduction, will probably inevitably the encrypt wire,the reduction line-spacing,increase the layers. The through hole of electricity is design more and more densely, aperture getting smaller. This is a higher request to the copper-plating of printed circuit board. According to plating situation of our country present printed circuit board, studies one kind of pulsing power supply , it's plating speed is quick,coating is even,perforation ability is strong,control precision is good and so on has very strong significance.This article first introduced pulse plating principle, pulse parameter choice basis as well as pulse parameter influence to coating; then the article introduce reverse pulse plating. By analyzing the pulse plating principle we know that in the pulse width,cyclical,seizes spatial ratio,electric current size appropriate situation, the pulse plating can cause to crystal to be closer,purity is higher,uniformity is better,ductility is stronger,corrosion resistance is stronger .This article develops the pulse power source uses the switching power supply as a DC power supply, achieve constant voltage / constant current regulation;Through cuts the wave to the current, thus obtains a series of pulse width adjustable positive and negative pulse; Through monolithic integrated circuit adjustment output voltage/current size and pulse width,frequency. What this pulse power source outputs is pulse which is the forward and reverse pulse width adjustable (May transform for the completely direct pulse), Actual is one "Dissolved coating" in the reverse pulse plating's anode current part, similar: Electricity polishing. Namely: Dissolved bulge part, Causes coating to be smooth, thus plays the leveling role. This power source has the volume to be smaller, weight to be lighter, efficiency to be higher, energy consumption to be lower, electric current/voltage constant automatic control function, forward and reverse pulse width adjustable, plating effect good and so on characteristics, university laboratory, project training center, enterprise R&D center is especially suitable.When the pulse power source is uses in board copper-plating, the board surface copper level and the opening wall copper level "Thickness ratio" can draw close 1 : 1, often presents "the dog bone" phenomenon in deep hole surface to be improved. Compares with direct-current power source, the pulse power source can save time about 30%; The board surface copper-plates thickness distribution to be evener, smoothness is improved.