Electronic apparatus and power supply

A power supply comprising:

• a power input terminal;
• an output capacitor;
• a synchronous rectifier connected to the power input terminal, and configured to rectify an AC voltage input through the power input terminal;
• a converter configured to convert the rectified AC voltage into a DC voltage based on a preset voltage and supply the DC voltage to the output capacitor;
• a diode bridge including an input terminal connected to the power input terminal and an output terminal connected to the output capacitor;
• and
• an electromagnetic interference filter provided between the power input terminal and the synchronous rectifier, and configured to block high frequency noise included in the AC voltage.

An electronic apparatus comprising:

• a load configured to receive power and perform an operation;
• and
• a power supply configured to supply power to the load, and comprising:
• a power input terminal,
• an output capacitor,
• a synchronous rectifier configured to rectify an AC voltage input through the power input terminal,
• a converter configured to convert the rectified AC voltage into a DC voltage based on a preset voltage and supply the DC voltage to the output capacitor,
• a protection circuit provided between the power input terminal and the output capacitor, and configured to supply an AC voltage higher than voltage charged in the output capacitor to the output capacitor by bypassing the synchronous rectifier, and
• an electromagnetic interference filter provided between the power input terminal and the synchronous rectifier, and configured to block high frequency noise included in the AC voltage.