LLC
Power Tips # 141: Tips and tricks for achieving wide operating ranges with LLC resonant converters
Inductor-inductor-capacitor (LLC) resonant converters have a couple of appealing characteristics for applications requiring an isolated DC/DC converter such as minimal switching losses, no reverse recovery when operating below the resonant frequency and the ability to tolerate large leakage inductance within the transformer. The challenge A primary challenge when designing an LLC converter with a wide…
Power Tips #137: Implementing LLC current-mode control on the secondary side with a digital controller
Current-mode control LLC considerations Inductor-inductor-capacitor (LLC) serial resonant circuits, as shown in Figure 1, can achieve both zero voltage switching on the primary side and zero current switching on the secondary side in order to improve efficiency and enable a higher switching frequency. In general, an LLC converter uses direct frequency control, which has only…