KR101416585B1 - Apparatus for standby power-saving in power supply and method thereof - Google Patents

Apparatus for standby power-saving in power supply and method thereof Download PDF

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KR101416585B1
KR101416585B1 KR1020130166466A KR20130166466A KR101416585B1 KR 101416585 B1 KR101416585 B1 KR 101416585B1 KR 1020130166466 A KR1020130166466 A KR 1020130166466A KR 20130166466 A KR20130166466 A KR 20130166466A KR 101416585 B1 KR101416585 B1 KR 101416585B1
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standby power
power
standby
load
residual
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KR1020130166466A
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Korean (ko)
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이일라
채기병
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주식회사 에이텍
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/263—Arrangements for using multiple switchable power supplies, e.g. battery and AC
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3212—Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The present invention relates to an apparatus and method for controlling a standby power of a power supply apparatus that minimizes standby power in an apparatus (e.g., a computer) using a power supply apparatus such as an SMPS (Switching Mode Power Supply) A standby power supply unit for generating a standby power to supply standby power to the main board and supplying standby power using the remaining power when the standby power is generated and off; Wherein the control unit is configured to measure a residual power supplied from the standby power supply unit after the standby power cutoff, to calculate a load amount by calculating an exhaustion time of the residual power, and to control standby power generation of the standby power supply unit according to the calculated load amount And a power control unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a standby power control apparatus for a power supply apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to standby power control of a power supply apparatus, and more particularly, to a power supply apparatus (e.g., a computer) using a power supply apparatus such as a Switching Mode Power Supply And more particularly, to a standby power control apparatus and method for a power supply apparatus.

Devices such as a desktop computer and a portable computer operate as a pair of a main body for performing calculations and a monitor for displaying an operation result and the like in use. These computers are used in restaurants and homes as much as it is difficult to count, not only in the companies that are currently working, but also in a lot. Computers are already popular, as it is very rare that one computer at home or company is not presently available.

The computer is powered or turned off by the power switch of the user. It is troublesome for the user to turn on the computer every time it is used and to turn off the power when not using the computer. It is common sense. Therefore, power dissipation occurs when not in use. Particularly, a device such as a computer activates a minimum device by using a standby power source even when the main power source is turned off in order to operate quickly in operation. For example, standby power is consumed even when the main power is off.

In order to prevent power wastage, a computer has a power saving mode, detects a keyboard input or the like, and automatically performs a power saving function when there is no keyboard input for a predetermined time period, thereby preventing power wastage.

These power saving devices are methods of controlling the main power by detecting the use state of the computer, and standby power is consumed.

Accordingly, various attempts have been made to save power by saving power to standby power when the apparatus is not in use. One of such efforts is the following patent document 1: Korean Patent Registration No. 10-1277197 (2013.06 .13. Registration).

The prior art disclosed in Patent Document 1 includes an input for receiving power, a main power controller for converting the power according to a user input and outputting main power, And a standby power controller for receiving an event detection signal from the sensor and outputting standby power by converting the power when the main power is not being output.

This prior art technique reduces standby power providing time, thereby reducing standby power.

Korea Registered Patent Registration No. 10-1277197 (Registered on June 13, 2013)

However, the above-described conventional technique controls the standby power depending on whether an event signal is sensed or not and whether or not the main power is used. If the user repeatedly uses or does not use the device, frequent standby power on / off control , There is a disadvantage that the use time of the device can be shortened or the damage can be caused by frequent on / off operation of the device.

In addition, since the conventional technique outputs the standby power and outputs the main power only when the event is detected after the standby power is interrupted, there is a disadvantage that the delay occurs in a very short time for the user to use the device in the state where the standby power is blocked .

SUMMARY OF THE INVENTION An object of the present invention is to solve at least the above problems occurring in the prior art, and it is an object of the present invention to minimize standby power in a device (e.g., a computer) using a power supply device such as a Switching Mode Power Supply And to provide a standby power control device for a power supply device and a method thereof.

It is another object of the present invention to provide a power supply apparatus and a power supply apparatus for supplying standby power by using residual power remaining in a power supply apparatus after shutdown of standby power so as to achieve the same effect as always supplying standby power without using actual standby power And to provide a standby power control apparatus and method therefor.

It is still another object of the present invention to provide a method and apparatus for controlling the amount of power consumed by an active standby power control by calculating a load of a main board by using a remaining time of power after shutting off standby power, A standby power control device for a standby power supply of a power supply device that maintains a standby state so that standby power can be restored when a state in which a device is always stably operated while a consumption state is low and a state in which a calculated load is remarkably low is detected for a long time is maintained .

In order to achieve the above object, the apparatus for controlling standby power of the power supply apparatus according to the present invention rectifies the input utility power, generates standby power to supply standby power to the main board, A standby power supply unit for supplying standby power using the residual power; A standby power generation unit that measures a voltage supplied from the standby power supply unit when standby power generation is off and calculates a load amount by calculating an exhaustion time of the residual power and controls standby power generation of the standby power supply unit in accordance with the calculated load amount And a control unit.

The standby power supply unit generates and supplies standby power when an event signal is generated.

The standby power supply unit may include a temporary storage unit for temporarily storing the generated standby power, and may supply remaining power to the temporary storage unit as standby power when the standby power is not generated.

Wherein the standby power control unit comprises: a standby power off detection unit operable to detect a standby power generation off in cooperation with the standby power supply unit; A residual power measuring unit for measuring a residual power supplied to the standby power when the standby power generation off is detected by the standby power off detection unit; A load calculation unit for calculating a residual load power consumption time of the residual power measurement unit and calculating a load; And a standby power control module for calculating a residual power holding time according to the load calculated by the load calculation unit and controlling standby power generation of the standby power supply unit according to the calculated residual power holding time.

In the standby power control module, the standby power control module determines whether the load amount calculated by the load calculation unit changes in real time, re-measures the residual power through the residual power measurement unit when the load is changed, calculates the load amount again through the load calculation unit, And the power holding time is recalculated.

According to an aspect of the present invention, there is provided a method of controlling standby power of a power supply apparatus, the method comprising: (a) confirming whether standby power generation is off; (b) if the standby power generation is off, supplying residual power as standby power; (c) measuring residual power supplied to the standby power and calculating a load based on the measured residual power; (d) calculating a standby power holding time based on the calculated load amount; (e) controlling standby power generation based on the calculated standby power holding time.

The standby power control method of the power supply apparatus according to the present invention further includes the steps of: (f) checking whether there is a load fluctuation in real time in a state of controlling standby power generation according to the standby power holding time, And a step of controlling the generation of the control signal.

The standby power control method of the power supply apparatus according to the present invention further comprises the steps of: (g) checking whether the residual power is buffered when the standby power is on, Off, and moving to step (b).

In the step (c), the load is calculated on the basis of the exhaustion time at which the measured residual power is exhausted to a certain level.

According to the present invention, standby power can be minimized in a device (e.g., a computer) using a power supply device such as a Switching Mode Power Supply (SMPS).

Further, according to the present invention, standby power is supplied by using remaining power remaining in the power supply device after standby power generation is off, thereby providing the same effect as supplying standby power at all times without using actual standby power have.

Further, according to the present invention, after the standby power is shut off, the load on the main board is calculated using the remaining power consumption time, and based on this, the standby power is supplied and cut off, It is possible to operate the apparatus at all times in a stable manner.

1 is a configuration diagram of an apparatus for controlling standby power of a power supply apparatus according to a preferred embodiment of the present invention,
FIG. 2 is a block diagram showing a configuration of an embodiment of the standby power control unit of FIG. 1;
3 is a flowchart illustrating a standby power control method of a power supply apparatus according to a preferred embodiment of the present invention.

Hereinafter, an apparatus and method for controlling standby power of a power supply according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an apparatus for controlling standby power of a power supply apparatus according to a preferred embodiment of the present invention.

An apparatus for controlling standby power of a power supply according to a preferred embodiment of the present invention includes an auxiliary power switch 10; A power supply unit 20, and a main board 30.

The auxiliary power switch 10 is a switch for generating an event signal so that the power supply unit 20 can supply main power and standby power in accordance with a user's operation in a state in which main power and standby power are cut off .

The power supply unit 20 is a device for supplying main power and standby power to the main board 30, and may be a device such as an SMPS provided in a device such as a typical computer.

The power supply unit 20 includes a main power supply unit 22 for rectifying and smoothing an input commercial power source (AC 220V) and then supplying main power to a predetermined DC voltage required by the system. A standby power supply unit 21 for rectifying the inputted commercial power, generating a standby power (5V) to supply standby power to the main board 30, and supplying standby power using the residual power when the standby power is cut off; The residual power supplied from the standby power supply unit 21 after the standby power cutoff is measured, the load is calculated by calculating the exhaustion time of the residual power, and the waiting of the standby power supply unit 21 And a standby power control unit 23 for controlling power generation. Here, the standby power control unit 23 includes a temporary storage device for generating and supplying standby power regardless of standby power control using residual power when an event signal is generated, and for temporarily storing the generated standby power, It is preferable that the power remaining in the temporary storage device is supplied as standby power.

As shown in FIG. 2, the standby power control unit 23 includes a standby power off detection unit 23a that detects standby power generation off in conjunction with the standby power supply unit 21; A residual power measuring unit 23b for measuring the residual power supplied to the standby power when the standby power generation off is detected by the standby power off detection unit 23a; A load calculation section (23c) for calculating the residual power consumption time of the residual power measurement section (23b) and calculating a load amount; A standby power control module 23d for calculating the remaining power holding time in accordance with the load amount calculated by the load calculation section 23c and controlling the standby power generation of the standby power supply section 21 in accordance with the calculated remaining power holding time, ).

Here, the standby power control module 23d determines whether the load amount calculated by the load calculation unit 23c is changed in real time, re-measures the residual power through the residual power measurement unit 23b when the load is changed, It is preferable to recalculate the residual power holding time by again calculating the load through the calculation unit 23c.

The standby power control unit 23 preferably uses a control module that uses an extremely small amount of current. The used current may be the residual power supplied from the standby power supply unit 21 to the main board 30. [

The main board 30 serves to operate the system with standby power supplied from the power supply unit 20 and main power. It is synonymous with a mainboard provided in a computer.

The operation of the standby power controller of the power supply apparatus according to the preferred embodiment of the present invention will now be described in detail.

First, in the initial state, the standby power supply unit 21 of the power supply unit 20 rectifies the input commercial power (AC 220V), smoothens it to a predetermined DC voltage (for example, DC 5V) And supplies the generated standby power to the main board 30.

When the user uses the device, the main power supply unit 22 also rectifies the input commercial power, smoothens and generates a predetermined DC voltage (for example, DC 12V, DC 24V) necessary for driving the system, (30).

 As described above, when the user uses the device, the power supply is normally supplied without supplying any additional power saving operation.

Thereafter, when the user enters the power saving mode without using the device, the main power supply unit 22 is turned off and the standby power supply unit 21 turns off standby power generation. When the standby power generation unit 21 turns off standby power generation, the standby power generation unit 21 transmits a standby power generation OFF signal to the standby power control unit 23. For this, a separate signal line is used to connect the standby power supply unit 21 and the standby power control unit 23, and a standby power supply unit 21 sends a signal for standby power generation off to the standby power control unit 23).

When the standby power generation unit 21 turns off standby power generation, the standby power supply unit 21 supplies the remaining power stored in the standby power temporary storage unit provided therein to the main board 30 as standby power. Here, a power supply apparatus such as a conventional SMPS is provided with a standby power supply apparatus for supplying standby power, and the standby power supply apparatus temporarily stores the generated standby power, And a storage device. When the main board 30 is not used, the capacitor does not discharge the charged power immediately but discharges the charged power gradually for a predetermined time. The discharged electricity is called residual power.

The standby power off detection unit 23a of the standby power control unit 23 detects the standby power generation off signal generated from the standby power supply unit 21 at a point in time when the residual power is started to be supplied to the main board 30 as standby power .

When the standby power off detection unit 23a detects the standby power generation off signal, the residual power measurement unit 23b receives an interrupt signal for measuring the residual power. Here, the interrupt signal may be generated by the standby power off detection unit 23a or may be generated by the standby power control module 23d.

When the interrupt signal is received, the residual power measuring unit 23b measures the voltage supplied from the standby power supplying unit 21 to the main board 30, calculates the residual power, and transmits the residual power to the load calculating unit 23c. Here, the residual power measurement method can be variously configured. In the present invention, the residual power is measured by connecting a current measuring device to the standby power supply line. This residual power measurement is continuously performed until standby power is generated.

The load calculation unit 23c receives the measured residual power in real time, calculates a time when the residual power is exhausted to a predetermined level or less, and calculates a load. Here, even when the main board 30 does not operate because the actual equipment is not used, there is a device that consumes a predetermined power due to the characteristics of the system. Therefore, a device consuming power can be regarded as a load even in such a non-operating state, and the amount of power used by the load is referred to as a load.

The load calculation unit 23c calculates a time to be exhausted by about 10% of the total residual power and transmits it to the standby power control module 23d at the load calculation time.

The standby power control module 23d calculates the holding time of the residual power according to the load calculation time to be transmitted. That is, when the residual power is completely consumed, standby power is not supplied to the actual main board 30, so that the load does not operate. In this case, even if the user generates an event signal for using the device, there is a problem that a certain time delay occurs until the device normally operates. Therefore, in order to solve such a problem as a matter of fact, the present invention calculates the holding time which is a time for supplying the standby power with the residual power. In other words, the holding time means a time for which the load can be driven by the residual power.

Then, the standby power control module 23d confirms the elapse of time from the current time and confirms that the holding time comes. As a result of the confirmation, when the holding time comes, an interrupt is generated in the standby power supply unit 21 immediately so that standby power can be generated.

For example, when the standby power is interrupted, the residual power stored in the capacitor or the like is supplied as standby power, and the exhaustion state of the residual power is confirmed by setting the holding time according to the load amount. When the holding time comes, standby power is generated to supply standby power again. In addition, when the standby power is generated, the standby power is interrupted, and the standby power is controlled by supplying the standby power using the residual power to perform power saving. When the standby power is normally generated and the standby power is supplied to the main board 30, it is preferable that the generation of the standby power is interrupted immediately and the standby power is supplied again with the residual power again.

On the other hand, in a state in which the standby power is supplied in the above-described manner, the standby power control module 23d continuously checks whether the load fluctuates. This is because the standby power consumed varies depending on the load variation. For example, if the user operates the USB memory device connected to the USB port of the computer in a state where the system is not used, the load is changed. At this time, if the standby power holding time is controlled according to the load amount calculated as described above, a problem occurs. That is, if a USB memory device is connected to a USB memory port, the actual load is increased. If such an increase in load is not taken into consideration, the exhaustion of the standby power is completed before the standby power holding time comes, It may not be driven. Therefore, in order to solve the above-mentioned problem, the present invention calculates the initial holding time and controls the standby power using the first holding time to check whether the load is fluctuated in real time. Here, the fluctuation of the load is determined by the load calculated by the load calculator.

If there is a change in load during the checking of the fluctuation of the load, the standby power control module 23d controls the residual power measuring part 23b to measure the residual power again. Then, the residual power measuring unit 23b measures the residual power supplied from the standby power supplying unit 21 to the main board 30, and transmits the measured residual power to the load calculating unit 23c. The load calculation unit 23c receives the newly measured residual power and calculates the time at which the residual power is exhausted to a certain level or lower, and recalculates the load. Then, the load calculation unit 23c transmits the calculated load calculation time to the standby power control module 23d. The standby power control module 23d again calculates the holding time of the residual power according to the newly calculated load calculating time. Then, the standby power generation is controlled in the same manner according to the retention time calculated again.

In addition, when the user operates the auxiliary power switch 10 to use the system during the supply of the standby power by using the standby power generation method using the standby power generation and the residual power as described above, And is transmitted to the standby power supply unit 21.

When an event signal is generated, the standby power control unit 23 controls the standby power supply unit 21 to immediately generate standby power and supply the standby power to the main board 30. This allows the user to use the system normally without delay.

The standby power control unit 23 turns off the standby power when the low load is maintained for a long period of time and maintains the standby state so that the input of the auxiliary power switch can be input as an event.

FIG. 3 is a flowchart illustrating a method of controlling standby power of a power supply according to a preferred embodiment of the present invention, wherein S is a step, and a process of controlling standby power by software in the standby power control unit 23 .

A standby power control method for a power supply apparatus according to the present invention includes the steps of: (a) confirming whether standby power generation is off (S11); (b) if the standby power generation is off, supplying residual power as standby power (S12); (c) measuring the residual power supplied to the standby power and calculating a load based thereon (S13 to S14); (d) calculating a standby power holding time based on the calculated load amount (S15); (e) controlling standby power generation based on the calculated standby power holding time (S16 to S17); (f) checking presence or absence of a load fluctuation in real time in a state of controlling standby power generation according to the standby power holding time, and controlling the generation of standby power when the load fluctuates as a result of the checking (S18); (g) checking whether the residual power is buffered if the standby power is on, checking if the remaining power is a buffered state, turning off the standby power and moving to the step (b) S20).

In the step (c), it is preferable to calculate the load based on the exhaustion time at which the measured residual power is exhausted to a predetermined level.

The standby power control method of the power supply apparatus according to the present invention as described above will be described in detail as follows.

First, the standby power supply unit 21 ends the standby power generation at the standby power cut-off time as in step S11, and supplies the standby power using the residual power stored in the temporary storage device at step S12, and at the same time, the standby power control unit 23 And transmits a standby power generation OFF signal to the control unit.

The standby power control unit 23 measures the residual power supplied from the standby power supply unit 21 to the main board 30 through the residual power measurement unit 23b when the standby power generation off signal is received in step S13 And transfers it to the load calculation section 23c.

In step S14, the load calculation unit 23c calculates the load based on the received residual power. Here, it is desirable to calculate the load on the basis of the exhaustion time at which the measured residual power is exhausted to a certain level.

In step S15, the standby power control module 23d calculates a holding time that can supply the standby power using the residual power based on the load amount calculated by the load calculation section 23c. That is, the holding time, which is the time during which the load of the main board 30 can be normally operated by the residual power, is calculated.

In step S16, it is confirmed whether or not the holding time comes while confirming the lapse of time. If it is determined that the retention time has come, the process proceeds to step S17 where an interrupt is generated in the standby power supply unit 21 to generate standby power again. After the standby power is normally generated, the standby power generation is terminated again, and the process proceeds to step S12 to supply the standby power using the residual power, and at the same time, the process after the step is performed again.

On the other hand, if it is determined in step S16 that the holding time has not arrived, the process proceeds to step S18 to check whether the load is fluctuated, while maintaining the process of supplying standby power using the residual power. Here, it is preferable to use the load calculated by the load calculation unit 23c.

If there is no change in the load amount as a result of checking the fluctuation of the load amount, the current state is maintained. Otherwise, if the load amount fluctuates, the flow shifts to step S17 to generate the standby power.

If it is determined in step (a) that the standby power is on, the process proceeds to step S19 to check whether the residual power is buffered. If the remaining power is not the buffered state, the standby power is maintained, The process goes to step S20 to turn off the standby power, and the process goes to step S12 to perform the following steps.

In the present invention, residual power stored in a capacitor or the like is supplied as standby power when the standby power is interrupted, and the exhaustion state of the residual power is confirmed by setting a retention time according to the load. When the holding time comes, standby power is generated to supply standby power again. In addition, when the standby power is generated, the standby power is interrupted, and the standby power is controlled by supplying the standby power using the residual power to perform power saving.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention is applied to a power saving technique of a power supply. In particular, it is effectively applied to a standby power saving in a system using standby power and main power such as a computer.

10: Auxiliary power switch
20: Power supply
21: standby power supply unit
22: Main power supply
23: Standby power control unit
23a: standby power off detection unit
23b: Residual power measuring unit
23c: Load calculation unit
23d: Standby power control module
30: Motherboard

Claims (9)

A standby power supply unit for rectifying an input commercial power supply, generating a standby power to supply standby power to the main board, and supplying standby power using residual power when the standby power generation is off;
The standby power generation unit measures the remaining power supplied from the standby power supply unit when the standby power generation is off, calculates the exhaustion time of the residual power to calculate a load amount, and controls generation of standby power of the standby power supply unit in accordance with the calculated load amount A standby power control unit;
Wherein the standby power control unit comprises: a standby power off detection unit operable to detect standby power generation off in cooperation with the standby power supply unit; A residual power measuring unit for measuring a residual power supplied to the standby power when the standby power generation off is detected by the standby power off detection unit; A load calculation unit for calculating a residual load power consumption time of the residual power measurement unit and calculating a load; And a standby power control module for calculating a remaining power holding time according to the load calculated by the load calculation unit and controlling generation of standby power of the standby power supply unit in accordance with the calculated remaining power holding time,
The standby power control module determines whether the load calculated in the load calculating unit changes in real time, re-measures the residual power through the residual power measuring unit when the load is changed, calculates the load again through the load calculating unit, And the retention time is recalculated.
The apparatus of claim 1, wherein the standby power supply unit generates and supplies standby power regardless of whether the standby power control unit is controlled when an event signal is generated.
The standby power supply unit according to claim 1, wherein the standby power supply unit includes a temporary storage unit for temporarily storing the generated standby power, and supplies residual power remaining in the temporary storage unit as standby power when the standby power is not generated Of the standby power of the power supply.
delete delete (a) confirming whether standby power generation is off;
(b) if the standby power generation is off, supplying residual power as standby power;
(c) measuring residual power supplied to the standby power and calculating a load based on the measured residual power;
(d) calculating a standby power holding time based on the calculated load amount;
(e) controlling standby power generation based on the calculated standby power holding time;
(f) controlling the presence or absence of a load fluctuation in real time in a state of controlling standby power generation in accordance with the standby power holding time, and controlling to generate standby power when the load fluctuates as a result of the confirmation A method for controlling standby power of a device.
delete The method according to claim 6, wherein the step (c) calculates a load based on an exhaustion time at which the measured residual power is exhausted to a predetermined level.
7. The method of claim 6, further comprising the steps of: (g) confirming whether the residual power is buffered when the standby power is on as a result of the checking in step (a) The standby power control method further comprising the step of:



KR1020130166466A 2013-12-30 2013-12-30 Apparatus for standby power-saving in power supply and method thereof KR101416585B1 (en)

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KR101826184B1 (en) 2016-04-15 2018-02-06 최정일 Standby power control apparatus having a standby power saving
KR20180082786A (en) * 2017-01-11 2018-07-19 김창현 Automatic power consumption reduction device and method for personal computer

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KR101221727B1 (en) * 2012-05-24 2013-01-11 황성하 Power saving type device for breaking standby power of electric outret
KR20130077748A (en) * 2011-12-29 2013-07-09 삼성전자주식회사 Power supply apparatus and display apparatus having the same

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KR20130077748A (en) * 2011-12-29 2013-07-09 삼성전자주식회사 Power supply apparatus and display apparatus having the same
KR101221727B1 (en) * 2012-05-24 2013-01-11 황성하 Power saving type device for breaking standby power of electric outret

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Publication number Priority date Publication date Assignee Title
KR101826184B1 (en) 2016-04-15 2018-02-06 최정일 Standby power control apparatus having a standby power saving
KR20180082786A (en) * 2017-01-11 2018-07-19 김창현 Automatic power consumption reduction device and method for personal computer

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