Bidirectional switched mode resonant type ac-dc converter and method for operating a bidirectional switched mode resonant type ac-dc converter

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Abstract

The present disclosure relates to switched mode bidirectional resonant type AC-DC converter comprising: an AC side circuit having a first AC connection (aca+) and a second AC connection (aca-) defining an AC side port, wherein the first and second AC connection define an AC voltage Vac and an AC 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 port and the internal AC coupling interface; a DC side circuit having a first DC connection (dcb+) and a second DC connection (dcb-) defining a DC side 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 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 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 further coupling circuit power switch pair comprising a diode and an active switch arranged in parallel, and resonant components configured to reduce switching losses in the AC power switch pairs and/or the at least one further coupling circuit power switch pair, a control circuit configured to operate the switched mode bidirectional resonant type AC-DC converter in four different operation modes corresponding to combinations of polarity of the AC voltage Vac and the AC current lac by enabling only one of the first and second coupling circuits in each operation mode. The present disclosure further elates to a method for operating a switched mode bidirectional resonant type AC-DC converter.

Original languageEnglish
IPCH02M 7/ 48 A I
Patent numberWO2019211290
Filing date30/04/2019
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date01/05/2018
Priority numberEP20180170241
Publication statusPublished - 7 Nov 2019

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