AC-DC converter device comprising an overvoltage protection circuit

An AC-DC converter device comprising:

• an AC-DC converter and a DC-DC converter connected between first and second AC input terminals and first and second DC output terminals, where the DC-DC converter comprises a first galvanic insulation barrier defining a border between a primary side and a secondary side of the AC-DC converter device and where the DC-DC converter comprises a first switch on the primary side;
• a gate pulse controller comprising a first control terminal connected to the first switch;
• a second galvanic insulation barrier;
• a first overvoltage protection circuit connected between the first DC output terminal and the first control terminal of the gate pulse controller;
• wherein the first overvoltage protection circuit is configured to turn off the first switch if an output voltage between the DC output terminals is above a threshold voltage;
• wherein the second galvanic insulation barrier is connected either between the first overvoltage protection circuit and the first control terminal or between the first control terminal and the first switch;
• and
• wherein the first overvoltage protection circuit comprises:
• a first comparator for comparing the DC output voltage with the threshold voltage;
• a first OVP switch comprising a first terminal connected to ground, a second terminal connected to the first control terminal of the gate pulse controller, and a gate terminal connected to an output terminal of the first comparator, wherein the first OVP switch is turned on when the output voltage is above the threshold voltage.