Research And Design Of Half-Bridge Zero-Voltage-Switched Multi-Resonant Converter

Since the advent of electronic equipment an electronic systems in 20 th,the technology of power transformation and control has developed rapidly.In recent years,the rapid development of handy-terminals and new energy products drives the growth of DC-DC converters.Therefore,it has great practical significance to design a “green” converter with high frequency,high efficiency and high reliability.Firstly,the development history of DC-DC converters is introduced through the development of topology structure and switching devices,and the conclusion that smaller volume and weight,higher efficiency and reliability will be the direction of development is get.Then the operational principle of converters and working mode of half-bridge zero-voltage-switched multi-resonant is analyzed,before calculating the parameters and the choosing components.After that,PFM control mode is selected,control circuit,protection circuit,feedback circuit is designed and calculated.According to the internal structure of control chip UC2861,the feed forward and feedback circuits is designed,which is used to ensure converter operating in a wider range of input voltage and load.The protection circuit and detection circuit is designed to make its working state can be detected by main board or upper computer in real time,which ensure converter operate safe and stably.After the design,the circuit of converter is simulating in Saber,and the result of simulation is analyzed.Then,the PCB of converter is designed,and the problem of EMI and EMC is analyzed during the process of prototype production.At last the prototype is made and detected to prove the correctness of design and the shortages and modification suggestions are proposed.