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This paper proposes a current driving scheme for synchronous rectifier (SR) in the LLC resonant converter with a voltage-doubler rectifier. The voltage-doubler rectifier has a simple-structure transformer which only needs one winding on the secondary side. The voltage stress across SRs is reduced to half of that in a center-tapped rectifier, which means SRs with smaller on resistance can be used....
A novel over-current protection (OCP) method for a LLC resonant converter has been proposed in this paper. This method is very attractive for its inherent current limit ability, especially under short-circuit condition. Combined with the frequency increasing method, good current limit features can be achieved. Compared to the conventional LLC resonant converter with frequency increasing method, LLC...
The over current protection is a difficult issue for LLC resonant converter design due to its variable frequency operation mode. Using clamping mode to achieve the over current protection can reduce the frequency range for design. However, clamping modes also have some drawbacks and some of them should be taken into account especially during the design processes. This paper focuses on the design consideration...
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