A High Step-Up Interleaved Current-Fed Resonant Converter for High-Voltage Applications

A current-fed LLC resonant converter is proposed for high-voltage and high-power applications. Here, a two-phase interleaved structure used in the input stage under continuous conduction mode (CCM) to effectively reduce current output voltage ripple values filter capacitors volumes. Due expandable high gain, configuration suitable applications since low stresses are applied across its components. In fact, power semiconductors, i.e., MOSFETs diodes, along with capacitors, almost one-third of implemented three-stage converter. switching frequency chosen close to, but less than, series different components’ perform soft-switching operation all devices wide variations. Therefore, losses, EMI noises reduced. Consequently, efficiency improved high-frequency possible, which reduces volume passive components achieve density. The given topology thoroughly analyzed mathematically. Also, 1 kW prototype has been validate simulations analyses. (100 V-200 V) W-1000 W) variations applied, an asymmetric pulse width modulation (APWM) technique at 143 kHz regulate kV. obtained maximum value 95.3%.