Research On The High-power Switch Mode Power Supply

With the expansion of the depth and scope of application of the switched mode powersupply(SMPS), high-power SMPS technology is one of the important development directions.The high-power SMPS has a very broad outlook, and a wide range of research and applicationin the field of electroplating power supply, welding power supply and electric vehiclecharging power supply industries etc. Therefore, the study on the high-power SMPS is ofgreat significance.In the actual experimental process, It has been found that AC power supply capacityconstraints the power of the SMPS. In this paper, to overcome the AC power supply capacityconstraints on high-power SMPS experiments, high power SMPS feedback circuit has beenbrought up. High-power SMPS feedback circuit connects the across inductor from the inputsection to the secondary rectifier section. The across inductor feeds back the energy,transferred to the secondary part of the transformer, to the input section of the system. Sohigh-power SMPS experiments can be achieved with a small power loss. And the simulationsoftware Saber has been used to verify the feasibility of high-power SMPS feedback circuit,and a prototype of high-power SMPS feedback circuit has been designed, which can let400Acurrent flow through the primary winding of the transformer.Found that existing technology cannot achieve highly reliable soft-start requirements forexisting high-power SMPS soft-start schemes, this paper proposes a new highly reliablesoft-start scheme,which can effectively guarantee reliability of the high-power SMPSsoft-start. And a specific circuit has been designed to realize the new soft-start scheme withthe analog circuit knowledge.Finally, experimental platforms of the new soft-start circuit and high-power SMPSfeedback circuit have been built to verified feasibility of highly reliable soft-start schemes andhigh-power SMPS feedback circuit.