Resonant converter system with ultra-wide output voltage range and control method

The invention provides a system and method for realizing an ultra-wide output voltage range of a resonant converter, and the system comprises a first switch, a second switch, a resonant unit, a first rectification branch and a second rectification branch, the first switch and the second switch are connected in series and then are connected in parallel with an input power supply, and the input end of the resonant unit is connected in parallel with the second switch. When the first switch is closed, the input power supply outputs electric energy to the resonance unit and provides the electric energy to a load through the first rectification branch, when the second switch is closed, the resonance unit freewheels and provides the electric energy to the load through the second rectification branch, a third switch is connected in series in the first rectification branch, and the second switch is connected in series in the second rectification branch. When the third switch is switched on, the first rectification bra