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In the control of a half-bridge, LLC resonant converter, both switches work at 50% duty cycle, due to the topology. Output regulation is achieved by varying the switching frequency of the square wave signals that drive both switches. By looking at the modulated square wave signal, it is possible to get an idea of how resonant control works. In the resonant controller, the switching frequency will be at the resonant tank frequency to give maximum power transfer when the load is at the maximum. As the load lightens, the controller raises the switching frequency, which results in less power being transferred into the tank and on to the load that is connected on the output of the power supply.
PTM Published on: 2013-02-27
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