Display apparatus and electronic apparatus

An electronic apparatus comprising:

• a connector connectable to a main body including a display;
• and
• an adapter configured to supply power to the main body while the main body is connected to the adapter via the connector and the adapter comprising:
• a transformer configured to boost a first alternating current (AC) voltage that is input,
• a switch comprising a switching device configured to switch a current flowing in the transformer,
• a controller configured to control the switching device to output a second AC voltage boosted by the transformer, and
• a first rectifier configured to rectify the input first AC voltage,
• a second rectifier configured to rectify the boosted second AC voltage,
• wherein the second AC voltage output from the adapter is subjected to power factor correction (PFC) and converted into a direct current (DC) voltage in the main body, and
• the controller detects the rectified second AC voltage, and controls the second AC voltage to be constant based on a result of the rectified second AC voltage detected.