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US 9,313,351 B2Granted
Power control apparatus and image forming apparatus including the same
AssigneeSamsung Electronics Co., Ltd.
InventorKwang Sung Park
Life of this patent
Estimating the term…
Abstract
A power control apparatus and an image forming apparatus including the same are disclosed. The power control apparatus can directly enable or disable a DC/DC converter for converting reference DC power to a secondary DC power without an additional microcomputer based power circuit by connecting an enable or disable operation of the DC/DC converter with an operation of a power button by a user. Accordingly, the number of components of a power control circuit can be reduced to decrease material cost and simplify the power control circuit. Furthermore, the power control apparatus and the image forming apparatus including the same can reduce unnecessary power consumption in a system off state.
Claims19
A power control apparatus comprising:
- a DC/DC converter including an enable pin and being enabled or disabled according to a level of a signal input to the enable pin;
- a switch connected to the enable pin and switched to change the level of the signal input to the enable pin;
- an input unit directly connected to one terminal of the switch and including a power button to control a switching state of the switch;
- and
- a trigger unit to divide a DC power into a reference voltage and output a trigger signal for turning on the switch such that a signal for disabling the DC/DC converter is input to the enable pin in case of power off,
- wherein the trigger signal is output to a diode connected to the switch.
3 more elements
A power control apparatus comprising:
- a DC/DC converter including an enable pin and being enabled or disabled according to a level of a signal input to the enable pin;
- a switch to apply a first voltage level signal for disabling the DC/DC converter to the enable pin when turned on and to apply a second voltage level signal to the enable pin when turned off;
- a trigger unit connected to one terminal of the switch to divide a DC power into a reference voltage and to output a trigger signal to tune on the switch such that the first voltage level signal is input to the enable pin in a power off state of a system;
- an input unit directly connected to one terminal of the switch and including a power button to control a switching state of the switch;
- a central processing unit (CPU) to recognize an operation state of the power button of the input unit;
- and
- a power controller to control the switching state of the switch according to a control signal of the CPU,
- wherein the trigger signal is output to a diode connected to the switch.
5 more elements
An image forming apparatus comprising:
- a photosensitive member;
- an optical scanning unit to form an electrostatic latent image on the photosensitive member;
- a developing unit to develop the electrostatic latent image formed on the photosensitive member into a developer image;
- a transfer unit to transfer the developer image formed on the photosensitive member to a printing medium;
- a fusing unit to fuse the developer image transferred by the transfer unit onto the printing medium;
- a control board to control an operation of at least one of the photosensitive member, optical scanning unit, developing unit, transfer unit and fusing unit;
- and
- a power control apparatus to supply power to at least one of the components,
- wherein the power control apparatus comprises:
- a DC/DC converter including an enable pin and being enabled or disabled according to a level of a signal input to the enable pin;
- a switch connected to the enable pin and switched to change the level of the signal input to the enable pin;
- an input unit directly connected to one terminal of the switch and including a power button to control a switching state of the switch, and
- a trigger unit to divide a DC power into a reference voltage and output a trigger signal for turning on the switch such that a signal for disabling the DC/DC converter is input to the enable pin in case of power off,
- wherein the trigger signal is output to a diode connected to the switch.
11 more elements
An image forming apparatus comprising:
- a photosensitive member;
- an optical scanning unit to form an electrostatic latent image on the photosensitive member;
- a developing unit to develop the electrostatic latent image formed on the photosensitive member into a developer image;
- a transfer unit to transfer the developer image formed on the photosensitive member to a printing medium;
- a fusing unit to fuse the developer image transferred by the transfer unit onto the printing medium;
- a control board to control an operation of at least one of the photosensitive member, optical scanning unit, developing unit, transfer unit and fusing unit;
- and
- a power control apparatus to supply power to at least one of the components,
- wherein the power control apparatus comprises:
- a DC/DC converter including an enable pin and being enabled or disabled according to a level of a signal input to the enable pin;
- a switch to apply a first voltage level signal for disabling the DC/DC converter to the enable pin when turned on and to apply a second voltage level signal to the enable pin when turned off;
- a trigger unit connected to one terminal of the switch to divide a DC power into a reference voltage and to output a trigger signal to tune on the switch such that the first voltage level signal is input to the enable pin in a power off state of a system;
- an input unit directly connected to one terminal of the switch and including a power button to control a switching state of the switch;
- a central processing unit (CPU) to recognize an operation state of the power button of the input unit;
- and
- a power controller to control the switching state of the switch according to a control signal of the CPU,
- wherein the trigger signal is output to a diode connected to the switch.
14 more elements
An image forming apparatus comprising:
- a photosensitive member;
- an optical scanning unit to form an electrostatic latent image on the photosensitive member;
- a developing unit to develop the electrostatic latent image formed on the photosensitive member into a developer image;
- a transfer unit to transfer the developer image formed on the photosensitive member to a printing medium;
- a fusing unit to fuse the developer image transferred by the transfer unit onto the printing medium;
- a control board to control an operation of at least one of the photosensitive member, optical scanning unit, developing unit, transfer unit and fusing unit;
- and
- a power control apparatus to supply power to at least one of the components,
- wherein the power control apparatus comprises:
- a DC/DC converter including an enable pin and being enabled or disabled according to a level of a signal input to the enable pin;
- a switch connected to the enable pin and switched to change the level of the signal input to the enable pin;
- an input unit directly connected to one terminal of the switch;
- a kick start unit connected to the input unit to automatically enable the image forming apparatus when alternating current (AC) power is supplied to the image forming apparatus;
- and
- a trigger unit to divide a DC power into a reference voltage and output a trigger signal for turning on the switch such that a signal for disabling the DC/DC converter is input to the enable pin in case of power off,
- wherein the trigger signal is output to a diode connected to the switch.
13 more elements
Dependencies are inferred from the claim text.