Controllable Usage Rates for Switching-Mode Power Supply in Parallel

In this paper, the switching mode power supplies in parallel with adjustable usage rates are proposed. The usage rate can be adjusted depending on the temperature of power-on supplies. This design succeeds in distributing the heat loss equally to prolong the lifetime of the switching power supplies. The output specification is 500 W/48 V, using LLC resonant topology, and also has the front-end stage, PFC, which is verified with the prototype.