Power supply, power control method for controlling a standby mode, and display apparatus having the same

A method of controlling power for receiving AC power and supplying the AC power as operating power to an electronic apparatus, the power control method comprising:

• rectifying a current of the AC power input as input power and converting the rectified current into a direct current (DC);
• and
• converting a level of a DC voltage converted from the input power into a predetermined level and concurrently converting the DC voltage, that has been converted into the predetermined level, into a predetermined standby voltage and an operating voltage and outputting the standby voltage and the operating voltage to the electronic apparatus,
• wherein the converting comprises converting the DC voltage output into a level of the predetermined standby voltage and supplying the DC voltage to the electronic apparatus, converting the DC voltage output into a level of the predetermined normal operating voltage and supplying the DC voltage to the electronic apparatus, and switching a current flow.

A display apparatus comprising:

• a signal receiver configured to receive an image signal;
• a signal processor configured to process the image signal received by the signal receiver;
• a display configured to display an image thereon based on the image signal processed by the signal processor;
• and
• a power supply configured to receive AC power as input power and supply the AC power to the display as operating power,
• wherein the power supply comprises:
• a rectifier configured to rectify a current of the AC power input as the input power and convert the rectified current into a DC voltage;
• a PFC circuit configured to correct a power factor of a DC voltage converted by the rectifier;
• a switching circuit, which comprises a first converter and a second converter, configured to convert the DC Voltage output by the PFC circuit into a predetermined operating voltage and standby voltage and supply the operating voltage and the standby voltage to the electronic apparatus;
• and
• an output controller which controls the PFC circuit and the switching circuit to convert the DC voltage into the predetermined operating voltage and standby voltage by the switching circuit and to supply the operating voltage and the standby voltage to the display apparatus,
• wherein the first converter comprises a primary coil, and a first secondary coil to which a predetermined voltage is applied by the primary coil, and
• wherein the second converter comprises the primary coil, and a second secondary coil which is connected to the primary coil in parallel with the first secondary coil in order to share the primary coil.

A power supply of an electronic apparatus, the power supply comprising:

• a switching circuit configured to convert a DC voltage into a predetermined operating voltage and a standby voltage;
• an output controller configured to control the switching circuit in order to supply the operating voltage and the standby voltage to the electronic apparatus;
• a rectifier configured to rectify an alternating current (AC) power input as input power, into a direct current (DC);
• a power factor correction (PFC) circuit configured to correct a power factor of a DC voltage converted by the rectifier,
• wherein the switching circuit comprises a first converter configured to convert the DC voltage output by the PFC circuit into a level of the predetermined standby voltage, a second converter which converts the DC voltage output by the PFC circuit into a level of the predetermined normal operating voltage, and a switching module which is connected to an input terminal of the first and second converters and switches a current flow,
• wherein the first converter comprises a primary coil and a first secondary coil to which a predetermined voltage is applied by the primary coil, and
• wherein the second converter comprises the primary coil, and a second secondary coil which is connected to the primary coil in parallel with the first secondary coil in order to share the primary coil.