Hybrid power conversion circuit

A hybrid power conversion circuit, configured to convert an input voltage into an output voltage, the hybrid power conversion circuit comprising:

• a high-side switch and a low-side switch connected at a first node, wherein the high-side switch is connected to a positive voltage end of the input voltage, and the low-side switch is connected to a negative voltage end of the input voltage,
• a transformer, comprising a primary-side winding and a secondary-side winding,
• a resonance tank, comprising an external inductance, an external capacitance and an internal inductance of the primary-side winding coupled in series, wherein the resonance tank is connected to the low-side switch in parallel,
• a first switch, connected to the external inductance in parallel,
• a second switch and a first capacitance forming a series-connected path, wherein the series-connected path is connected to the external capacitance in parallel,
• a first synchronous rectification switch and a second synchronous rectification switch, respectively coupled to a first winding and a second winding of the secondary-side winding,
• and
• a third switch, connected to the second synchronous rectification switch in series,
• wherein when the output voltage is less than a voltage interval, the hybrid power conversion circuit operates in a hybrid flyback conversion mode;
• when the output voltage is greater than the voltage interval, the hybrid power conversion circuit operates in a resonance conversion mode.