LLC resonant converter with adaptive burst mode control for TV power applications
摘要
The LLC resonant converter enters burst mode under light-load conditions to improve efficiency. However, in the burst mode, the magnetic components generate noise, which increases as the load increases. This study proposes the adaptive burst mode control that adjusts the burst mode entry point on the basis of operation modes. The proposed circuit consists of a single capacitor and FET, minimizing component counts and space requirements. The proposed converter operates in the burst mode during the standby mode which requires high efficiency. It also operates in the normal mode during the low-power mode which needs a low noise level. Thus, the proposed converter meets standby mode power consumption requirements and noise level specifications. The effectiveness of the proposed converter is verified using: 400 V of input and outputs of 13 V/3.17 A and 247 V/0.316 A.