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 comparisons of two typical over current protections by using clamping mode for LLC resonant converter. Finally, an 110V/10A prototype is built up to verified the theoretic comparison results.
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