Resonant type power factor correction ac-dc converter and method for operating a resonant type power factor correction ac-dc converter

The present disclosure relates to a resonant type power factor correction AC-DC converter comprising: an AC side circuit having a first AC connection (aca+) and a second AC connection (aca-) defining an AC side input port, wherein the first and second AC connection define an AC input voltage Vac and an AC input current lac for the converter; a third AC connection (acb+) and a fourth AC connection (acb-) defining an internal AC coupling interface; and at least two AC power switch pairs comprising a diode and an active switch arranged in parallel, the at least two AC power switch pairs arranged between the AC side input port and the internal AC coupling interface; a DC side circuit having a first DC connection (dcb+) and a second DC connection (deb-) defining a DC side output port; a parallel DC side output capacitor (CDC); and a third DC connection (dca+) and a fourth DC connection (dca-) defining an internal DC coupling interface; a first coupling circuit (CC+) between the AC side circuit and the DC side circuit, connected to the third AC connection (acb+) and the third DC connection (dca+); a second coupling circuit (CC-) between the AC side circuit and the DC side circuit, connected to the fourth AC connection (acb-) and the third DC connection (dca+); wherein said first and second coupling circuits comprise: at least one coupling circuit diode, and resonant components configured to reduce switching losses in the AC power switch pairs and/or the at least one coupling circuit diode; a power factor control circuit configured to shape the AC input current lac according to the AC input voltage Vac; and a control circuit configured to operate the resonant type power factor correction AC-DC converter in two different operation modes based on the polarity of the AC input voltage Vac and the AC input current lac by enabling only one of the first and second coupling circuits in each operation mode, the control circuit configured to control a resonant operation with resonant components in the first coupling circuit (CC+) in a first operation mode, wherein Vac >0 and lac>0, the control circuit further configured to control a resonant operation with resonant components in the second coupling circuit (CC-) in a second operation mode, wherein Vac