High-voltage Electrostatic Spraying Based Power Supply Design

In recent years, the increasingly hot electrostatic spraying, as opposed to conventionalspray, it has a great advantage. Use spray equipment for spraying thin material is notrequired, so that the environment plays a role in protection, and Viagra is no harm topeople; the quality of the coating appearance is better adhesion and mechanicalstrength are better; spray curing time short; corrosion resistant coating capability isparticularly high; no primer; the operation is relatively simple, less demanding manualtechniques; cost much lower than the painting process; some operating situations mustbe treated using an electrostatic spray process; use Process dusting spray equipment isnot common flow phenomenon.However, as a number of small companies using spraying no special high-voltagetransmission lines, and therefore the strength of the electrostatic field generated little,resulting in the production of product defects more. In order to solve this majorproblem is not the high-voltage input, design a DC high voltage electrostatic power,step-up, generate a strong electrostatic field, so that the effect of spraying significantlystrengthened.In this paper, hand-held spraying equipment for the background, given thehigh-voltage electrostatic power supply design ideas to solve the problem ofinsufficient electrostatic field strength. DC high voltage electrostatic power supplycontrol part of the main PWM control mode change switch is turned on and off timeratio in order to achieve the output voltage magnitude can be artificially controlled.The control range of the output voltage is about0~30kV, minimum adjustmentamount1kV, the error is approximately±500V, the output current is about50uA.Tests showed the number of applications on module conversion and partial pressurefeedback in order to be able to measure the size of the voltage and displayed on theLCD screen, and also timely voltage curve plotted in order to load-impedance changes were observed in a timely manner. With a voltage meter to the output end of the device is measured, results showed that the power output of the high-voltage electrostatic device designed in this paper did produce a high voltage can be controlled, low current "static." This high pressure between the spray gun and the workpiece, can contribute to generate more significant coating results.