Power conversion device

A power conversion device, comprising:

• a high-voltage circuit, a low-voltage circuit, a magnetic assembly, a sampling circuit, a high-voltage terminal, and a low-voltage terminal;
• wherein the high-voltage circuit is electrically connected to the high-voltage terminal, and the low-voltage circuit is electrically connected to the low-voltage terminal;
• wherein the low-voltage terminal comprises a first low-voltage terminal and a second low-voltage terminal;
• wherein the low-voltage circuit comprises a first lower switch and a second lower switch, one end of the first lower switch and one end of the second lower switch are both electrically connected to the second low-voltage terminal;
• wherein the magnetic assembly comprises a first end, a second end, a third end, a low-voltage winding, and an inductor winding, the first end of the magnetic assembly is electrically connected to another end of the first lower switch, the second end of the magnetic assembly is electrically connected to another end of the second lower switch, and the third end of the magnetic assembly is electrically connected to the first low-voltage terminal;
• the low-voltage winding and the inductor winding are electrically connected in series and then bridged between the third end of the magnetic assembly and the first end or the second end of the magnetic assembly;
• wherein the sampling circuit comprises a first auxiliary winding, a second auxiliary winding, a sampling resistor and a sampling capacitor electrically connected in series in no particular order, the first auxiliary winding is coupled with the low-voltage winding, and the second auxiliary winding is coupled with the inductor winding;
• the sampling circuit is bridged between the third end of the magnetic assembly and the first end or the second end of the magnetic assembly;
• and wherein a current sampling voltage is a voltage across the sampling capacitor.