Abstract
The LLC resonant converter, one of the DC-DC converters, is used together with the Power Factor Correction (PFC) converter to receive a stable DC input from the commercial power supply. The conventional Boost PFC converter has a simple structure, but due to the semiconductor device used, conduction loss and switching loss occur and low efficiency can be obtained. The bridgeless type of boost PFC converter has a lower number of devices than a general boost PFC converter. Also, high efficiency can be achieved by reducing switching loss by using Critical Conduction Mode (CRM) modes of the PFC. A current sensor is required for CRM operation mode. But this paper applies bridgeless CRM PFC and LLC resonant converters based on digital control without current sensor, and through PSIM simulation and experiment, the above are verified.
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