Research On Soft Switching DC/DC Resonant Converter Based On Push-Pull Structure

With the rapid development of information construction in China,Various types of highprecision electronic equipment represented by data centers emerge in endlessly.This type of equipment has very high requirements on the reliability of power supply.Once a sudden situation such as a power outage occurs,it will cause damage to related equipment,and it will cause damage to important data storage information.cause significant economic loss.Thanks to the continuous advancement of informatization construction,uninterruptible power supply(UPS)has become an important part of informatization infrastructure construction.Therefore,related research on uninterruptible power supply(UPS)has important academic and social value.This paper focuses on the uninterrupted power supply(UPS)based on a two-stage architecture,with the primary DC/DC converter as the research object.Firstly,the research hotspots of push-pull converters at home and abroad are introduced.Through topology comparison and product research,the main power topology and its power rating are determined.Secondly,the working principle of the series resonant soft-switching push-pull converter is presented,and the gain and soft-switching characteristics of the converter are analyzed.To address the issue of the trade-off between gain and efficiency in the converter,a bidirectional resonant soft-switching push-pull converter is constructed by adding an additional resonant inductor to improve the transformer turns ratio and enhance the converter efficiency.Based on this,the optimal resonant inductor parameters for minimizing losses in the corresponding converter are determined through parameter optimization design,and a design method for resonant circuit parameters is provided.Finally,the efficiency and power rating of the converter are further improved by constructing a dual-transformer resonant soft-switching push-pull converter.In order to verify the correctness of the theoretical analysis,the SIMPLIS simulation software was used to simulate and analyze the above three converters,and the soft switching and gain characteristics of the converter were simulated and verified.Finally,three different types of converter hardware experiment platforms were built and DSP software controls program design,which verifies the correctness and rationality of relevant theoretical design.