Research On Parallel Current Sharing Technology For DC/DC Spacecraft Power Modules

With the increasing demand of spacecraft for power supply, there is anincreasing standard of power supply for its power density, integration, modularity,expansibility and reliability. According to these aspects of demand for spacecraftpower supply, this topic has been studied parallel balanced current technique. Basedon this technique, three power supplies for spacecraft have been made. It is tested toverify that this means has high expansibility reliability and stability which suits forthe demand of spacecraft power supply.In this article, different methods of magneticreset for different DC/DCtopologies are firstly compared and a proper topology is chosen for the main circuitof this topic. Several methods of parallel balanced current technique are discussedthen, after the analysis of their operating principle, we choose a superior method forparallel balanced current technique of the topic. It is the max current automatic flowmethod.After all the methods were chosen. A small-signal analysis was carried out forthe single module. Through the small-signal analysis and Matlab simulation, thestability of the single module was confirmed to be within the standard. Then thephysical structure of the circuit, whose rated input voltage was100V and ratedoutput power was20W, was proceed successfully.Based on the good working circumstance of single module, another twomodules were made and used to conduct the parallel experiment. The experimentconfirms that the stability and accuracy of current sharing was good enough to meetthe stantard of the spacecraft power supply.