Switching mode power supply usable in an image forming apparatus, and image forming apparatus and method of supplying power by using the same

A method of supplying power to an image forming apparatus by using a switching mode power supply, the method comprising:

• converting an alternating current (AC) voltage input to the switching mode power supply into at least one direct current (DC) voltage by using at least one transformer;
• receiving a control signal to control a switching operation of the switching mode power supply according to whether the image forming apparatus is in an operating mode or a power saving mode, from a system controller that controls operations of the image forming apparatus;
• switching a voltage level of an output voltage, which is output to the system controller from among the at least one DC voltage, to a first voltage level or a second voltage level, based on the control signal, where the second voltage level is lower than the first voltage level;
• and
• outputting the switched output voltage to the system controller.

A computer readable recording medium having embodied thereon a computer program to execute a method of supplying power to an image forming apparatus by using a switching mode power supply, wherein the method comprises:

• converting an alternating current (AC) voltage input to the switching mode power supply into at least one direct current (DC) voltage by using at least one transformer;
• receiving a control signal to control a switching operation of the switching mode power supply according to whether the image forming apparatus is in an operating mode or a power saving mode, from a system controller that controls operations of the image forming apparatus;
• switching a voltage level of an output voltage, which is output to the system controller from among the at least one DC voltage, to a first voltage level or a second voltage level, based on the control signal, where the second voltage level is lower than the first voltage level;
• and
• outputting the switched output voltage to the system controller.