Redundancy of a resonant converter stage by frequency adaptation

A resonant DC/DC converter, comprising:

• a first DC link;
• a DC/AC converter comprising a first plurality of N>1 converter bridges connected in parallel to the first DC link,
• wherein N is an integer,
• wherein each converter bridge of the first plurality of N>1 converter bridges comprising a plurality of semiconductor switches, and
• wherein each semiconductor switch of the plurality of semiconductor switches may be switched between a conducting state and a non-conducting state;
• an AC intermediate circuit connected to the DC/AC converter and comprising:
• a transformer having a primary side and a secondary side;
• wherein the primary side comprises a plurality of M>1 primary windings,
• wherein M is an integer;
• a first plurality of N capacitors,
• wherein each capacitor of the first plurality of N capacitors is connected between a respective converter bridge of the first plurality of N>1 converter bridges and a common node,
• a second plurality of M capacitors,
• wherein each capacitor of the second plurality of M capacitors is connected between the common node and a respective primary winding of the plurality of M>1 primary windings;
• a control unit configured to switch the plurality of semiconductor switches of the first plurality of N>1 converter bridges between the conducting state and the non-conducting state or vice versa with a switching frequency to supply an AC current or voltage to the AC intermediate circuit;
• a plurality of N current sensing means,
• wherein, for each converter bridge of the first plurality of N>1 converter bridges, a current sensing means of the plurality of N current sensing means is provided for monitoring a current through the converter bridge of the first plurality of N>1 converter bridges;
• wherein the control unit is configured to determine whether the current through a converter bridge of the first plurality of N>1 converter bridges deviates from an expected value;
• and
• wherein the control unit is configured to increase the switching frequency in response to the current through the converter bridge of the first plurality of N>1 converter bridges deviating from the expected value.