Power supply apparatus and image forming apparatus

A power supply apparatus comprising:

• a first circuit connected to a predetermined power supply;
• a second circuit insulated from the first circuit;
• an adjustment unit included in the first circuit and configured to adjust power supplied from the predetermined power supply to a load connected to the first circuit;
• a detection unit included in the first circuit and configured to detect a parameter related to the power supplied from the predetermined power supply to the load;
• a first communication unit included in the first circuit and connected to the detection unit;
• a second communication unit included in the second circuit, insulated from the first communication unit, and configured to perform wireless communication with the first communication unit;
• and
• a control unit included in the second circuit and configured to control the adjustment unit based on a detection result of the detection unit, the detection result being transmitted from the first communication unit to the second communication unit by the wireless communication,
• wherein the detection unit is configured to operate with power resulting from a voltage generated in the first communication unit due to a voltage output from the control unit to the second communication unit,
• wherein the first communication unit includes first wiring constituting a first antenna configured to perform the wireless communication, the first wiring electrically connecting a first connection portion of the detection unit and a second connection portion of the detection unit,
• wherein the second communication unit includes second wiring constituting a second antenna configured to perform the wireless communication, the second wiring electrically connecting a third connection portion of the control unit and a fourth connection portion of the control unit,
• wherein the first wiring is disposed to not contact the second wiring, and
• wherein at least a part of a region surrounded by the first wiring and the detection unit overlaps a region surrounded by the second wiring and the control unit in a case where a circuit substrate is seen along a direction perpendicular to a surface of the circuit substrate where the detection unit is disposed.