LLC METHOD AND APPARATUS FOR CONTROLLING OUTPUT VOLTAGE OF INTERLEAVED LLC RESONANT CONVERTER USING SPREAD SPECTRUM

摘要

According to an embodiment of the present invention, provided is a method for controlling output voltage of an interleaved LLC resonant converter in which a primary side circuit comprises a first LLC tank and a second LLC tank. The method for controlling output voltage of an interleaved LLC resonant converter comprises the steps of: sensing output voltage of a secondary side circuit; generating a proportional-integral (PI) compensation signal in accordance with a pulse frequency modulation (PFM) method based on the output voltage; generating a spread spectrum control signal; and generating a first switching signal for controlling a first switching unit connected to the first LLC tank and a second switching signal for controlling a second switching unit connected to the second LLC tank based on the PI compensation signal and the spread spectrum control signal.