Resonant converter and method of operating the same

摘要

A LLC resonant converter (10) that includes a plurality of electronic switches (12A) arranged to form a bridge (114) and a controller (16). The bridge (114) is operable to an operating mode that includes a full-bridge (114) mode and a half-bridge (114) mode. The controller (16) is configured to adjust an operating frequency (24) used to operate the bridge (114) based on a comparison of a set-point value (20) to an output value (22) of an output voltage (22) generated by converter (10), change the operating mode to the half-bridge (114) mode if the operating mode is the full-bridge (114) mode, an output current (28) of the converter (10) is less than a minimum current threshold (30), and the operating frequency (24) is greater than a maximum frequency threshold (32), and change the operating mode to the full bridge (114) mode if the operating mode is the half-bridge (114) mode, and the operating frequency (24) is less than a minimum frequency threshold (34).