| With the continuous development of modern power electronic devices and automatic control technology,the surface treatment of industrial equipment electroplating and aerospace equipment has put forward higher requirements for the stability,reliability and power quality of electroplating power supplies.In these fields,high-power electroplating power supplies using thyristor and hard-switching technology can no longer meet the industry’s energy-saving and emission-reduction requirements.Therefore,the study of high-efficiency and low-ripple electroplating power supplies has important engineering practical significance for improving the yield of electroplated devices and the accuracy of electroplating process.This paper takes the low-voltage and high-current electroplating power supply as the research object,and analyzes the advantages and disadvantages of soft switching technology,synchronous rectification technology and parallel current sharing technology,as well as the working mode of the circuit.Aiming at the problem of improving the output efficiency of the power supply,an electroplating power supply combining synchronous rectification technology and phase-shifting full-bridge technology is proposed to determine the topological circuit structure of the power supply.Secondly,this paper analyzes in detail the input rectifier filter circuit,phase-shifted full bridge circuit,synchronous rectifier circuit and filter circuit at the rear stage.The small-signal model is analyzed,and the front-stage phase-shifting and subsequent-stage synchronous control technology is adopted to realize the high efficiency and low ripple of the electroplating power supply.At the same time,for the multi-module parallel circulation problem,a virtual impedance-based self-leveling Flow method,the current sharing effect of this method is verified by simulation.Through the simulation experiment of the topology circuit of 18V/1000 A electroplating power supply and its control method,the correctness of the method is verified.At the same time,the relevant parameters of the topological circuit structure are calculated and compared with the simulation parameters to determine the selection of the experimental device parameters.Finally,through hardware and software process design,an 18V/1000 A experimental prototype was built.The experimental results show that the efficiency reaches 93.1% and the ripple coefficient is 2.4% when running at full load,which meets the design specifications of the electroplating power supply. |
