Isolated communications apparatus and power supply system

A power supply system, wherein the power supply system comprises a transformer and an isolated communications apparatus applied to the transformer, wherein the transformer comprises N first rectifier units and a second rectifier unit, a potential difference between at least one of the N first rectifier units and the second rectifier unit is greater than a specified threshold, and the N first rectifier units are connected to each other in a cascaded manner;

• the isolated communications apparatus comprises N first control units, a second control unit, and a signal convergence unit;
• the N first control units are in a one-to-one correspondence with the N first rectifier units, and each first control unit is connected to a corresponding first rectifier unit;
• and each of the N first control units is connected to the signal convergence unit, the signal convergence unit and the second control unit are connected through an optical fiber, and N is a positive integer;
• any one of the N first control units is configured to:
• detect an operating parameter of the corresponding first rectifier unit, and
• generate a first data packet based on the detected operating parameter, wherein the first data packet comprises an identifier of the first control unit,
• send the first data packet to the signal convergence unit,
• receive a second data packet sent by the signal convergence unit, wherein the second data packet comprises the identifier of the first control unit and a control parameter, and
• adjust the operating parameter of the corresponding first rectifier unit based on the control parameter;
• the signal convergence unit is configured to:
• receive first data packets from the N first control units,
• send the first data packets of the N first control units to the second control unit,
• receive at least one second data packet from the second control unit,
• determine, based on the identifier that is of the first control unit and that is comprised in each second data packet, a first control unit corresponding to each second data packet, and
• send each second data packet to the first control unit corresponding to each second data packet;
• and
• the second control unit is configured to:
• receive the first data packets of the N first control units from the signal convergence unit,
• generate, based on the first data packets of the N first control units, a second data packet corresponding to at least one first control unit, and
• send, to the signal convergence unit, the second data packet corresponding to the at least one first control unit.