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

摘要

In one embodiment, a method of controlling an output voltage of an interleaved LLC resonant converter, in which the primary side circuit includes a first LLC tank and a second LLC tank, includes: sensing an output voltage of the secondary side circuit; Generating a PI compensation signal according to the PFM scheme based on the output voltage, generating a spread spectrum control signal, and a first switching connected to the first LLC tank based on the PI compensation signal and the spread spectrum control signal Generating a first switching signal for controlling the unit and a second switching signal for controlling the second switching unit connected to the second LLC tank.