Conversion control circuit for adjusting PFC output voltage and control method thereof

A conversion control circuit, configured to control a resonant power converter and configured to adjust a first output voltage generated by a power factor correction (PFC) circuit, wherein the resonant power converter generates a second output voltage based on the first output voltage, the second output voltage being programmable, and the first output voltage being adaptively adjustable, the conversion control circuit comprising:

• a first transconductance circuit, configured to generate a first current signal based on a proportional output voltage related to the second output voltage;
• a second transconductance circuit, configured to generate a second current signal based on an input-related signal, wherein the input-related signal is related to a peak value of an input voltage of the PFC circuit;
• and
• a current control circuit, configured to generate a third current signal based on the first current signal and the second current signal;
• wherein the third current signal is positively correlated with the first current signal and negatively correlated with the second current signal;
• wherein the third current signal is configured to adjust the first output voltage such that when the second output voltage decreases, the first output voltage decreases accordingly, and when the input voltage decreases, the first output voltage also decreases.