主权项 |
1. A method for operating an LLC resonant converter (19; 79) for a light-emitting means (3; 5; 50), wherein the LLC resonant converter (19; 79) has a primary-side circuit (20; 80), which comprises a half-bridge (21, 22) and an LLC resonant circuit (25-27), and a secondary side (13; 30) galvanically isolated therefrom, the method comprising:
controlling the half-bridge (21, 22) by clocked switching of switches (21, 22) of the half-bridge, detecting a load (3; 5; 50), to which energy is supplied from an output (35) of the secondary side (13; 30), based on a measured variable (iavg) detected in the primary-side circuit (20; 80), and adapting the control of the half-bridge (21, 22) on the basis of the measured variable (iavg) detected in the primary-side circuit (20; 80), wherein the measured variable (iavg) detected in the primary-side circuit (20; 80) is proportional to an average value of a current and a peak value of the current (ipeak) is detected and an overcurrent protection operating mode for the light-emitting means (3; 5; 50) is initiated selectively depending on a threshold value comparison of the peak value (ipeak). |