LLC SOFT START BY OPERATION MODE SWITCHING

摘要

Disclosed are an apparatus including an LLC converter and a method of reducing surge current in an LLC converter. The LLC converter (100) comprises a switching circuit (102) having a first switch (SWl) and a second switch (SW2), a resonant circuit, and a rectification circuit (106). During start up of the LLC converter, first and second signals having a fixed period and a variable duty cycle are applied to the first and second switches (SWl, SW2), respectively. When a predetermined voltage on a load configured to be coupled to the rectification circuit (106) is reached, the first and second signals are changed to signals having a variable period and a fixed duty cycle.