Power conversion apparatus

A power conversion apparatus, comprising:

• a circuit board;
• a transformer, disposed on the circuit board, wherein the transformer has a first winding and a second winding, a first end of the first winding is configured to receive an input voltage, and a first end of the second winding is configured to provide an output voltage;
• a first circuit, disposed on the circuit board, coupled to the first end of the first winding to provide the input voltage, and coupled to a second end of the first winding;
• a second circuit, disposed on the circuit board, coupled to the first end of the second winding to receive an output voltage, and coupled to a second end of the second winding;
• a first main coil, two ends of the first main coil coupled to the first circuit;
• and
• a second main coil, printed on the circuit board, a first end of the second main coil coupled to the second circuit, and a second end of the second main coil coupled to a first reference potential terminal, wherein the first main coil is magnetically coupled to the second main coil, and the first main coil and the second main coil are electrically insulated from each other,
• wherein the first circuit and the second circuit perform digital signal communication through the first main coil and the second main coil to control a voltage value of the output voltage.