Power supply apparatus with low power in standby mode

Abstract

Provided is a power supply apparatus with low power in a standby mode. The apparatus includes a voltage multiplier configured to multiply an input voltage and including a first terminal through which the multiplied voltage is output and a second terminal through which a voltage lower than a voltage of the first terminal is output; a main switch-mode power supply (SMPS) configured to receive the voltage of the first terminal of the voltage multiplier; and a standby SMPS configured to receive a voltage of the second terminal of the voltage multiplier.

What is claimed is: 
     
         1 . An image forming apparatus comprising:
 a power supply apparatus with low power in a standby mode; and   an image formation unit configured to receive power from the power supply apparatus and form images,   wherein the power supply apparatus comprises:   a voltage multiplier configured to multiply an input voltage and including a first terminal through which the multiplied voltage is output and a second terminal through which a voltage lower than the multiplied voltage is output;   a main switch-mode power supply (SMPS) configured to receive the voltage of the first terminal of the voltage multiplier as an input voltage; and   a standby SMPS configured to receive a voltage of the second terminal of the voltage multiplier as an input voltage.   
     
     
         2 . A power supply apparatus comprising:
 a rectifier configured to rectify input power;   a voltage multiplier configured to multiply the input power;   a switch unit configured to switch to the rectifier or the voltage multiplier in response to a predetermined control signal;   a main switch-mode power supply (SMPS) connected to the rectifier or the voltage multiplier based on the switching of the switch unit; and   a standby SMPS connected to the rectifier or the voltage multiplier based on the switching of the switch unit.   
     
     
         3 . The apparatus of  claim 2 , wherein the rectifier rectifies the input power and outputs output power controlled by the switching of the switch unit,
 and the voltage multiplier is connected in parallel to the rectifier and multiplies the input power, and outputs output power controlled by the switching of the switch unit, the voltage multiplier including a first capacitor and a second capacitor.   
     
     
         4 . The apparatus of  claim 2 , wherein the switch unit switches to the rectifier or the voltage multiplier depending on an external operating mode. 
     
     
         5 . The apparatus of  claim 3 , wherein the switch unit switches to the rectifier or the voltage multiplier depending on output powers of the main SMPS and the standby SMPS. 
     
     
         6 . An image forming apparatus comprising:
 a power supply apparatus with low power in a standby mode; and   an image forming unit configured to receive power from the power supply apparatus and form an image,   wherein the power supply apparatus comprises:   a rectifier configured to rectify input power;   a voltage multiplier configured to multiply the input power;   a switch unit configured to switch to the rectifier or the voltage multiplier in response to a predetermined control signal;   a main switch-mode power supply (SMPS) connected to the rectifier or the voltage multiplier based on the switching of the switch unit; and   a standby SMPS connected to the rectifier or the voltage multiplier based on the switching of the switch unit.   
     
     
         7 . A power supply apparatus comprising:
 a first SMPS configured to receive a first voltage of a power source to generate a first power to an electronic device in a first mode of the electronic device; and   a second SMPS configured to receive a second voltage of the power source to generate a second power to the electronic device in a second mode of the electronic device.   
     
     
         8 . The apparatus of  claim 7 , wherein the second power is lower than the first power. 
     
     
         9 . The apparatus of  claim 7 , wherein the power source comprises:
 a voltage multiplier to receive an input voltage, the voltage multiplier having a first terminal to output the first voltage and a second terminal to output the second voltage.   
     
     
         10 . The apparatus of  claim 7 , further comprising:
 a switch unit configured to switch the power source to output the first voltage or the second voltage according to a predetermined control signal.   
     
     
         11 . The apparatus of  claim 10 , wherein the power source comprises:
 a rectifier to output the first voltage based on the predetermined control signal; and   a voltage multiplier to output the second voltage based on the predetermined control signal.   
     
     
         12 . The apparatus of  claim 7 , wherein the first mode corresponds to a powered on status of the electronic device, and the second mode corresponds to a standby status of the electronic device. 
     
     
         13 . An image forming apparatus comprising:
 an image formation unit configured to receive power from a power supply apparatus with low power in a standby mode, the power supply comprising:   a first SMPS configured to receive a first voltage of a power source to generate a first power to the image formation unit in a first mode of the image formation unit; and   a second SMPS configured to receive a second voltage of the power source to generate a second power to the image formation unit in a second mode of the image formation unit.   
     
     
         14 . The apparatus of  claim 13 , wherein the second power is lower than the first power. 
     
     
         15 . The apparatus of  claim 13 , wherein the power source comprises:
 a voltage multiplier to receive an input voltage, the voltage multiplier having a first terminal to output the first voltage and a second terminal to output the second voltage.   
     
     
         16 . The apparatus of  claim 13 , wherein the power supply further comprises a switch unit configured to switch the power source to output the first voltage or the second voltage according to a predetermined control signal. 
     
     
         17 . The apparatus of  claim 16 , wherein the power source comprises:
 a rectifier to output the first voltage based on the predetermined control signal; and   a voltage multiplier to output the second voltage based on the predetermined control signal.   
     
     
         18 . The apparatus of  claim 13 , wherein the first mode corresponds to a powered on status of the image formation unit being powered on, and the second mode corresponds to a standby status of the image formation unit.