KR20010036316A - A power-saving system - Google Patents

Abstract

PURPOSE: A power saving system is provided to adjust power voltage supplying in each circuit by rendering an image displaying unit to receive a power saving signal from a computer by wireless. CONSTITUTION: A computer(10) comprises the first control unit creating a control signal by power saving modes and a wireless converting unit(12) converting the control signal according to power saving modes inputted from the first control unit(11) into a wireless signal and transmits the wireless signal. An image displaying unit(20) comprises a wireless demodulation unit(21), a power source unit(22), the second control unit(23) and a circuit breaking unit(24). The wireless demodulation unit(21) demodulates the wireless signal received from the wireless converting unit(12) into a control signal according to power saving modes. The power source unit(22) adjusts a magnitude of outputting power voltage in accordance with the control signal inputted from the wireless demodulation unit(21) and supplies the outputting power voltage to each circuits. The second control unit(23) controls each circuit by operating the power voltage supplied from the power source unit(22). The circuit breaking unit(24) intercepts the operation of the second control unit(23) if a control signal of a specific saving mode is inputted from the wireless demodulation unit(21). In addition, the circuit breaking unit(24) re-drives the operation of the second control unit(23) if a control signal of a saving mode except the specific saving mode is inputted.

Description

A power-saving system

The present invention relates to a power saving system.

More particularly, the present invention relates to a power saving system for reducing power consumption by controlling a magnitude of a power supply voltage supplied to each part of a circuit by receiving a bending signal wirelessly from a computer.

In general, a cathode ray tube (CRT) used in an image display device has a different brightness or color light due to a different amount of electron beam hitting a fluorescent material of RGB (red cyan) coated on the surface of the cathode ray tube according to the intensity of an image signal. It uses the principle of making it very popular and is widely used because of its excellent price and display performance.

FIG. 1 is a perspective view illustrating a general image display device, and the image display device 20 receives an image signal and a synchronization signal received from a video card of a computer 10 and displays them on a cathode ray tube screen.

2 is an overall block diagram of a general video display device, wherein the video display device 20 includes a video amplifier 1, a control unit 2, a power supply unit 3, a deflection unit 4, a high voltage unit 5, and a cathode ray tube ( CRT) and the like.

As shown in FIG. 2, the R, G, and B image signals input from the computer 10 are amplified through the video amplifier 1 and applied to the cathode terminal of the cathode ray tube CRT and displayed on the screen.

At this time, in order to display the R, G, B image signal on the cathode ray tube (CRT) screen, by supplying a sawtooth current to the horizontal deflection coil and the vertical deflection coil, the electron beam is deflected in the horizontal direction and the vertical direction to the entire cathode ray tube screen As the raster must be formed, the sawtooth current is generated in the deflection section 4 and provided to the horizontal deflection coil and the vertical deflection coil.

The power supply unit 2 supplies a power supply voltage necessary for operating each unit of the video display device such as the video amplifier 1, the control unit 3, the deflection unit 4, the heater.

In general, when the user does not use the computer without turning off the power, the control unit built in the computer 10 recognizes this and reduces the power consumption to 5 W or less. If the user wants to use the computer 10 again, the immediately previous use screen is automatically displayed on the image display device 20 immediately.

The image display device having such a power saving function is implemented by a DPMS (Display Power Management System) according to the standards of the Video Electronics Standards Association (hereinafter referred to as VESA), which is a normal mode, a suspend mode, and an off mode. Off) mode is operated, and controlled by the software of the control unit built in the computer (10).

Node Computer controls Image display device control unit Horizontal sync signal (H.SYNC) Vertical Synchronization Signal (V.SYNC) Suspension signal (SUS) OFF signal normal Output (O) Output (O) High level High level Suspend Output (X) Output (O) Output (O) Output (X) Low level High level off Output (X) Output (X) Low level Low level

Referring to Table 1 and Figures 2 and 3, the operation of a general video display device is divided into a normal mode, a suspend mode, and an off mode as follows.

3 is a circuit diagram showing a power supply unit and a peripheral circuit of a general video display device;

Normal mode

The control unit of the computer 10 outputs both the horizontal and vertical synchronization signals (H.sync and V.sync) to the image display device control unit 3, so that the image display device control unit 3 receives the high level suspense signal ( SUS) and the OFF signal OFF are outputted to the power supply unit 2.

The power supply unit 2, which receives the suspend signal SUS and the OFF signal OFF, which is always at a high level, supplies the rated power supply voltage to each circuit unit as it is to operate the image display device circuits.

That is, when both the suspend signal SUS and the off signal OFF of the high level are inputted to the power supply unit 2 in the normal mode, the transistors Q3, Q4, Q5, and Q6 are all switched on and the power supply unit is turned on. The power supply voltages Vo, Vom, and Von output from (2) are supplied to each circuit portion as they are.

2. Suspension Mode

The controller of the computer 10 controls only one of the horizontal and vertical synchronization signals H.sync and V.sync when there is no input on the keyboard for a predetermined time (typically 1,2 minutes). Will output

Accordingly, the power supply unit 2, which receives the low level suspend signal SUS and the high level off signal OFF from the image display device controller 3, cuts off the power supply voltage supplied to each circuit.

At this time, since the heater (Heater) is not easily heated, even when in the suspend mode, switching to the normal mode proceeds quickly only when the rated power supply voltage (6.3V) is supplied to the heater (Heater).

In addition, since the control unit 3 must always verify the horizontal and vertical synchronization signals (H.sync and V.sync) input from the computer 10 in order to switch to the normal mode, it is rated to the control unit 3 even in the suspend mode. Supply power supply voltage of 5V.

That is, in the suspend mode, in order to reduce power consumption of the video display device, the supply of the supply voltage is stopped to stop the operation of all the circuits, and the supply voltage is supplied only to the heater and the controller 3.

That is, when the high level suspend signal SUS and the low level OFF signal OFF are input to the power supply unit 2 in the suspend mode, only the transistors Q5 and Q6 are switched off and the power supply voltage output from the power supply unit 2 ( Only Vom and Von are supplied to the heater and the control unit 3, respectively.

3. In off mode

The control unit of the computer 10 does not output both the horizontal synchronizing signal and the vertical synchronizing signal (H.sync and V.sync) to the image display device control unit 3, so that the image display device control unit 3 is at a low level. The suspend signal SUS and the OFF signal OFF are outputted to the power supply unit 2.

The power supply unit 2, which receives the low level suspend signal SUS and the OFF signal OFF, cuts off the power supply voltage supplied to each circuit, and unlike the suspend mode, the power supply voltage supplied to the heater. Also cut off (6.3V).

However, in order to switch to the normal mode, the control unit 3 should supply the rated power supply voltage (5V) even in the off mode.

That is, when both the low level suspend signal SUS and the off signal OFF are input to the power supply unit 2 in the off mode, the transistors Q3, Q4, Q5 and Q6 are all switched off and output from the power supply unit 2. Only a power supply voltage Von is supplied to the controller 3.

However, in the conventional video display device 20, in order to switch to the normal mode as described above, the control unit 3 must always verify the horizontal and vertical synchronization signals (H.sync and V.sync) input from the computer 10. Therefore, since the power supply voltage 5V must be supplied to the control unit 3 even in the suspend mode, there is a problem that it becomes a major factor of power consumption in the off mode.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to provide a power-saving system to adjust the magnitude of the power supply voltage supplied to each part of the circuit by the image display device wirelessly received the signal from the computer There is this.

Power saving system according to the present invention for achieving the above object,

A computer having a first control unit for generating a control signal for each power saving mode, and a wireless modulator for modulating and transmitting a control signal for each power saving mode from the first control unit into a wireless signal;

A wireless demodulator for demodulating the wireless signal received from the wireless demodulator into a control signal for each power saving mode, a power supply unit for adjusting a magnitude of an output voltage based on a control signal for each power saving mode input from the wireless demodulator and supplying it to each circuit; A second control unit operating by a power supply voltage supplied from the power supply unit, and when a control signal of a specific power saving mode is input from the wireless demodulation unit, the operation of the second control unit is shut off, except for the specific power saving mode When the control signal of the other power saving mode is input, it characterized in that the image display device having a blocking unit for restarting the operation of the second control unit.

In addition, the power saving system according to the present invention for achieving the above object,

A computer having a first control unit for generating a first control signal for each power saving mode, and a wireless modulator for modulating and transmitting a first control signal for each power saving mode input from the first control unit into a wireless signal;

A wireless demodulator for demodulating the wireless signal received from the wireless demodulator into a first control signal for each power saving mode, and generating a second control signal for each power saving mode by a first control signal for each power saving mode input from the wireless demodulation unit. A second control unit, a power supply unit supplying or blocking an output voltage to each circuit by a second power saving signal for each power saving mode input from the second control unit, and receiving the first control signal of a specific power saving mode from the wireless demodulation unit; And an image display device having a blocking unit for interrupting the operation of the power supply and resuming the operation of the power supply unit when the first control signal of the power saving mode other than the specific power saving mode is input.

1 is a perspective view of a general image display device;

2 is a block diagram of a general video display device;

3 is a circuit diagram showing a power supply unit and its surroundings of a typical image display device;

4 is a block diagram showing a first embodiment of a power saving system according to the present invention;

5 is a circuit diagram of FIG. 4;

6 is a block diagram showing a second embodiment of a power saving system according to the present invention;

7 is a circuit diagram of FIG. 6.

* Names of symbols for main parts of the drawings

10 computer 11: first control unit

12: wireless modulator 20: Youngsan display equipment

21: wireless demodulator 22: power supply

23: second control unit 24: blocking unit

Hereinafter, a power saving system according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing a first embodiment of a power saving system according to the present invention, and FIG. 5 is a circuit diagram of FIG.

As shown in FIGS. 4 and 5, the first embodiment of the power saving system according to the present invention includes a first control unit 11 for generating a control signal S1 for each power saving mode and an input from the first control unit 11. A computer 10 provided with a wireless modulator 12 for modulating a control signal S1 for each power saving mode into a wireless signal and transmitting the modulated signal; The wireless demodulator 21 demodulates the wireless signal received from the wireless modulator 12 into a control signal S1 for each power saving mode, and the control signal for each power saving mode S1 input from the wireless demodulator 21. The power supply unit 22 to adjust the magnitude of the output voltage and supply the circuit to each circuit, the second control unit 23 and the wireless demodulator 21 to operate the circuit according to the power supply voltage supplied from the power supply unit 22. When the control signal S1 of the specific power saving mode is inputted, the operation of the second control unit 23 is interrupted, and when the control signal S1 of another power saving mode other than the specific power saving mode is input, the second control unit The video display device 20 is provided with a blocking unit 24 for resuming the operation of the apparatus 23.

Here, the power supply unit 22 includes an input unit (D1, R1, C1) for receiving a commercial AC voltage from the outside to convert the commercial DC voltage (Vi); A power transistor Q1 switched on / off by a PWM control signal; The commercial DC voltage Vi is inputted from the input units D1, R1, and C1 to the primary winding, and AC voltages Vs, Vsm, and Vsn are applied to the secondary winding by switching on and off the power transistor Q1. A transformer T for releasing; Output parts D2, C2, D3, C3, and D4 which convert AC voltages Vs, Vsm and Vsn inputted from the secondary side of the transformer T into DC voltages Vo, Vom, and Von, and output them to circuit parts. , C4); A feedback unit R2, R3, R4, EA, PD1 that detects the magnitude of a predetermined power supply voltage Vo output from the output units D2, C2, D3, C3, D4, and C4 and generates a feedback voltage Vfb. , PT1, C5); The power control unit IC generates a PWM control signal based on the feedback voltage Vfb and supplies the PWM control signal to the power transistor Q1. The control signal S1 for each power saving mode output from the wireless modulator 21 is generated. By the current of the feedback voltage (Vfb) or the magnitude of the voltage is adjusted.

In addition, the blocking unit 24 is switched on when the control signal S1 of a specific mode is input from the wireless demodulator 21 to switch the power supply voltage supplied from the power supply unit 22 to the second control unit 23. When switching off and receiving the control signal (S1) of the other modes except for the specific mode is switched off is made of a switching device for supplying a power supply voltage from the power supply unit 22 to the second control unit 23, the switching device Is a photocoupler composed of a light emitting diode PD2 and a light receiving transistor PT2 having different grounds, and outputs a control signal S1 for each power saving mode of the wireless demodulator 21 connected to the transformer T primary side. (T) It transfers to the 2nd control part 23 connected to the secondary side.

In addition, the first control unit 11 generates a control signal S1 of the normal mode, the suspend mode, the off mode, and the mute mode, and the blocking unit 24 controls the control mode of the off mode from the wireless demodulator 21. When the input of S1 is received, the operation of the second control unit 23 is interrupted, and when the control signal S1 of the normal mode, the suspend mode, or the mute mode is received, the operation of the second control unit 23 is resumed.

6 is a block diagram showing a second embodiment of a power saving system according to the present invention, and FIG. 7 is a circuit diagram of FIG.

As illustrated in FIGS. 6 and 7, a second embodiment of the power saving system according to the present invention includes a first control unit 11 and a first control unit 11 generating a first control signal S1 for each power saving mode. A computer 10 provided with a radio modulator 12 for modulating and transmitting the first control signal S1 for each power saving mode into a radio signal; A wireless demodulator 21 for demodulating the radio signal received from the radio modulator 12 into a first control signal S1 for each power saving mode, and a first control signal for each power saving mode input from the wireless demodulator 21. The output voltage is controlled by the second control unit 22 generating the second control signal S2 for each power saving mode by S1 and the second power saving signal S2 for each power saving mode input from the second control unit 22. When the first control signal S1 of a specific power saving mode is input from the power supply unit 23 and the wireless demodulation unit 21 to supply or cut off each circuit, the operation of the power supply unit 23 is interrupted, and the specific power saving mode is executed. When the first control signal S1 of the power saving mode other than the input is received, the image display device 20 is provided with a blocking unit 24 for restarting the operation of the power supply unit 23.

The power supply unit 22 is an input unit (D1, R1, C1) for receiving a commercial AC voltage from the outside to convert the commercial DC voltage (Vi); A power transistor Q1 switched on / off by a PWM control signal; The commercial DC voltage Vi is inputted from the input units D1, R1, and C1 to the primary winding, and AC voltages Vs, Vsm, and Vsn are applied to the secondary winding by switching on and off the power transistor Q1. A transformer T for releasing; Output parts D2, C2, D3, C3, and D4 which convert AC voltages Vs, Vsm and Vsn inputted from the secondary side of the transformer T into DC voltages Vo, Vom, and Von, and output them to circuit parts. , C4); A feedback unit (R2, R3, R4, Q2, D5) that detects the magnitude of a predetermined power supply voltage (Vo) output from the output units (D2, C2, D3, C3, D4, C4) and generates a feedback voltage (Vfb). , PD1, PT1, C5); A power control unit (IC) for generating a PWM control signal based on the feedback voltage (Vfb) and supplying the PWM control signal to the power transistor (Q1); Power saving unit Q3, Q4, C6, C7 for supplying or blocking the output voltages Vo, Vom, and Von to each circuit part by the second control signal S2 for each power saving mode output from the second control unit 22. , R5, R6, R7, R8, R9, and R10).

In addition, the blocking unit 24 is switched on when receiving the first control signal S1 of a specific power saving mode from the wireless demodulation unit 21 and returns the feedback voltage Vfb to the power control unit 22 of the power supply unit 23. A switching device which switches off and supplies the feedback voltage Vfb to the power control unit IC of the power supply unit 23 when the first control signal S1 of the power saving mode other than the specific mode is inputted. Wherein, the switching element, consisting of a photocoupler consisting of a light emitting diode (PD2) and a light receiving transistor (PT2) having a different ground, the control according to the power saving mode of the wireless demodulator 21 connected to the secondary side of the transformer (T) The signal S1 is transmitted to the power supply unit 22 connected to the primary side of the transformer T.

In addition, the first control unit 11 generates a control signal S1 of the normal mode, the suspend mode, the off mode, and the mute mode, and the blocking unit 24 controls the control mode of the off mode from the wireless demodulator 21. Upon receiving S1, the operation of the power supply unit 23 is interrupted, and upon receiving the control signal S1 of the normal mode, the suspend mode, or the mute mode, the operation of the power supply unit 23 is resumed.

Looking at the operation of the first embodiment and the second embodiment according to the present invention divided as follows.

1. First embodiment

First, when the first control unit 11 built in the computer 10 generates the control signal S1 according to the power saving mode, the wireless modulator 12 receives the control signal for each power saving mode input from the first control unit 11. S1 is modulated into a radio signal and then transmitted.

Accordingly, the wireless demodulator 21 of the image display device 20 demodulates the radio signal received from the radio modulator 12 into a control signal S1 for each power saving mode, and inputs it from the radio demodulator 21. By the control mode S1 for each power saving mode, the power supply unit 22 adjusts the magnitude of the output voltage and supplies it to each circuit.

In this case, a general switched power circuit (SMPS) is applied to the power supply unit 22. Briefly referring to the operating principle of the power supply unit 22, a commercial AC voltage input from the outside is inputted into the input unit D1,. After converting into DC voltage Vi through R1, C1, it is supplied to one end of the primary coil of the transformer T, and the power transistor Q1 is connected to the other end of the secondary winding of the transformer T, By switching on / off the power transistor Q1, AC voltages Vs, Vsm and Vsn are generated in the secondary winding of the transformer T, and then the AC voltages Vs, Vsm and Vsn are outputted. D2, C2, D3, C3, D4, and C4 are converted into DC voltages (Vo, Vom, and Von) and supplied to each circuit.

The feedback unit R2, R3, R4, EA, PD1, PT1, C5 detects the magnitude of the predetermined power supply voltage Vo output from the output units D2, C2, D3, C3, D4, C4 and returns the feedback voltage. Generates a Vfb, and accordingly, the power controller IC generates a PWM control signal by comparing the feedback voltage Vfb with a reference voltage Vref and then transmits the PWM control signal to the power transistor Q1. By supplying, the power transistor Q1 is controlled to be switched on / off.

At this time, the power supply unit 22 according to the present invention by controlling the current or the voltage of the feedback voltage (Vfb) by the power-saving mode-specific control signal (S1) output from the wireless modulator 21, the power control unit By adjusting the duty ratio of the PWM signal generated in the (IC) to maintain the power supply voltage (Vo, Vom, Von) output from the power supply unit 22 in the normal mode, and the power supply unit 22 in suspend mode or off mode or mute mode Power supply voltages (Vo, Vom, and Von) output from the power supply are reduced to a predetermined voltage or less, thereby reducing power consumption of the image display device 20.

In addition, since the second control unit 23 operating by the power supply voltage Von supplied from the power supply unit 22 controls each of the circuit units, the control signal S1 of the OFF mode from the wireless demodulator 21 is controlled. When is input, the blocking unit 24 interrupts the operation of the second control unit 23 and resumes the operation of the second control unit 23 when the control signal S1 of the normal mode, the suspend mode, or the mute mode is input. Let's do it.

The blocking unit 24 includes a photocoupler including a light emitting diode PD2 and a light receiving transistor PT2 having different grounds, and control signals for each power saving mode of the wireless demodulator 21 connected to the primary side of the transformer T. S1 is transmitted to the second control unit 23 connected to the secondary side of the transformer T.

That is, when the control signal S1 of the off mode is input from the wireless demodulator 21, the light emitting diode PD2 emits light, and accordingly, the light receiving transistor PT2 is switched on so that the light emitting transistor PT2 is switched on from the power supply unit 22. 2 When the power supply voltage Von supplied to the controller 23 is cut off and the control signal S1 of the normal mode, the suspend mode, or the mute mode is input, the light emitting diode PD2 stops emitting light, and thus receives light. The transistor PT2 is switched off to supply a power supply voltage Von from the power supply unit 22 to the second control unit 23.

Accordingly, in the OFF mode, the power supply voltage Von supplied to the second control unit 23 is cut off by the blocking unit 24, thereby reducing power consumption of the image display device 20.

2. Second Embodiment

First, when the first control unit 11 built in the computer 10 generates the first control signal S1 according to the power saving mode, the wireless modulator 12 is for each power saving mode inputted from the first control unit 11. The first control signal S1 is modulated into a radio signal and then transmitted.

Accordingly, the wireless demodulator 21 of the image display device 20 demodulates the wireless signal received from the wireless modulator 12 into a first control signal S1 for each power saving mode, and the wireless demodulator 21 The second control unit 23 generates the second control signal S2 for each power saving mode by the first control signal S1 for each power saving mode input from the power saving mode.

The second control signal S2 for each power saving mode input from the second control unit 23 supplies or cuts off the power supply voltage supplied from the power supply unit 22 to each circuit portion.

In this case, a general switched power circuit (SMPS) is applied to the power supply unit 22. Briefly referring to the operating principle of the power supply unit 22, a commercial AC voltage input from the outside is inputted into the input unit D1,. After converting into DC voltage Vi through R1, C1, it is supplied to one end of the primary coil of the transformer T, and the power transistor Q1 is connected to the other end of the secondary winding of the transformer T, By switching on / off the power transistor Q1, AC voltages Vs, Vsm and Vsn are generated in the secondary winding of the transformer T, and then the AC voltages Vs, Vsm and Vsn are outputted. D2, C2, D3, C3, D4, and C4 are converted into DC voltages (Vo, Vom, and Von) and supplied to each circuit.

The feedback unit R2, R3, R4, EA, PD1, PT1, C5 detects the magnitude of the predetermined power supply voltage Vo output from the output units D2, C2, D3, C3, D4, C4 and returns the feedback voltage. Generates a Vfb, and accordingly, the power controller IC generates a PWM control signal by comparing the feedback voltage Vfb with a reference voltage Vref and then transmits the PWM control signal to the power transistor Q1. By supplying, the power transistor Q1 is controlled to be switched on / off.

At this time, the power saving units Q3, Q4, C6, C7, R5, R6, R7, R8, R9, and R10 are supplied to the power supply unit 22 by the second control signal S2 for each power saving mode input from the second control unit 23. By supplying or interrupting the power supply voltage supplied to each part of the circuit, the power consumption of the video display device 20 is reduced as a result.

The second control signal S2 generated by the second control unit 23 by the first control signal S1 is a low or high level suspend signal SUS and an off signal OFF.

That is, when both the suspend signal SUS and the off signal OFF of the high level are input to the power supply unit 22 in the normal mode, all of the transistors Q3, Q4, Q5, and Q6 are switched on. The power supply voltages Vo, Vom, and Von output from the power supply unit 22 are supplied to each circuit unit as they are, and in the suspend mode, the high-level suspending signal SUS and the low-level off signal OFF are supplied to the power supply unit 22. Is inputted, only transistors Q5 and Q6 are switched off and only the power supply voltages Vom and Von output from the power supply unit 22 are supplied to the heater and the second control unit 23, respectively. When both the low-level suspend signal SUS and the off signal OFF are input to the transistors, all of the transistors Q3, Q4, Q5, and Q6 are switched off, and only the power supply voltage Von output from the power supply unit 22 is the second. It is supplied to the control part 23.

In addition, the blocking unit 24 interrupts the operation of the power supply unit 23 when receiving the first control signal S1 in the off mode from the wireless demodulation unit 21, and then operates the normal mode, the suspend mode, or the mute mode. 1 When the control signal S1 is input, the operation of the power supply unit 23 resumes.

The blocking unit 24 includes a photocoupler including a light emitting diode PD2 and a light receiving transistor PT2 having different grounds, and includes a first power saving mode of the wireless demodulator 21 connected to the secondary side of the transformer T. The control signal S1 is transmitted to the power control unit IC of the power supply unit 22 connected to the secondary side of the transformer T.

That is, when the first control signal S1 in the off mode is input from the wireless demodulator 21, the light emitting diode PD2 emits light, and accordingly, the light receiving transistor PT2 is switched on to switch on the power supply unit 22. When the feedback voltage Vfb supplied to the power controller IC is cut off and the first control signal S1 of the normal mode, the suspend mode, or the mute mode is input, the light emitting diode PD2 stops emitting light. Accordingly, the light receiving transistor PT2 is switched off to supply the feedback voltage Vfb to the power control unit IC of the power supply unit 22.

Accordingly, in the OFF mode, the operation of the power control unit IC of the power supply unit 22 is interrupted by the blocking unit 24 to block the operation of the power supply unit 22, thereby consequently consuming the image display device 20. Reduce power.

As described above, in the circuit according to the present invention, the image display device 20 wirelessly receives a control signal for each power saving mode from the computer 10 and adjusts the magnitude of the power voltage supplied to each part of the circuit while in the off mode. By blocking the operation of the second control unit 23, the power consumption of the image display device 20 is reduced.

Claims (12)

A computer having a first control unit for generating a control signal for each power saving mode, and a wireless modulator for modulating and transmitting a control signal for each power saving mode from the first control unit into a wireless signal; A wireless demodulator for demodulating the wireless signal received from the wireless demodulator into a control signal for each power saving mode; A second control unit operating by a power supply voltage supplied from the power supply unit, and when a control signal of a specific power saving mode is input from the wireless demodulation unit, the operation of the second control unit is shut off, except for the specific power saving mode And a video display device having a blocking unit for restarting the operation of the second control unit when a control signal of another power saving mode is input. The method of claim 1, wherein the power supply unit, An input unit which receives commercial AC voltage from the outside and converts the DC into commercial DC voltages; A power transistor switched on / off by a PWM control signal; A transformer which receives a commercial DC voltage from the input unit in the primary winding and induces an AC voltage in the secondary winding by switching on / off of the power transistor; An output unit for converting an AC voltage input from the secondary side of the transformer into a DC voltage and outputting it to each circuit portion; A feedback unit for generating a feedback voltage by detecting a magnitude of a predetermined power supply voltage output from the output unit; And a power control unit generating a PWM control signal by the feedback voltage and supplying the power to the power transistor. Power saving system, characterized in that the magnitude of the current or voltage of the feedback voltage is adjusted by the control signal for each power saving mode output from the wireless modulator. The method of claim 2, wherein the blocking unit, When the control signal of a specific mode is input from the wireless demodulator, the controller is switched on to cut off the power voltage supplied to the second controller from the power supply unit. When the control signal of a mode other than the specific mode is received, the signal is switched off. And a switching device for supplying a power supply voltage from the power supply unit to the second control unit. The method of claim 3, wherein the switching device, It is composed of photocoupler composed of light emitting diode and light receiving transistor with different ground, And a power saving mode control signal for the wireless demodulator connected to the transformer primary side to a second control unit connected to the transformer secondary side. The method of claim 1, wherein the first control unit, A power saving system characterized by generating a control signal of a normal mode / suspend mode / off mode / mute mode. The method of claim 5 wherein the blocking unit When the control signal of the off mode is received from the wireless demodulator, the operation of the second control unit is interrupted, and when the control signal of the normal mode, the suspend mode or the mute mode is input, the operation of the second control unit is resumed. Power saving system. A computer having a first control unit for generating a first control signal for each power saving mode, and a wireless modulator for modulating and transmitting a first control signal for each power saving mode input from the first control unit into a wireless signal; A wireless demodulator for demodulating the wireless signal received from the wireless demodulator into a first control signal for each power saving mode, and generating a second control signal for each power saving mode by a first control signal for each power saving mode input from the wireless demodulation unit. A second control unit, a power supply unit supplying or blocking an output voltage to each circuit by a second power saving signal for each power saving mode input from the second control unit, and receiving the first control signal of a specific power saving mode from the wireless demodulation unit; And an image display device having a blocking unit for interrupting the operation of the power supply and resuming the operation of the power supply unit when the first control signal of the power saving mode other than the specific power saving mode is input. The method of claim 7, wherein the power supply unit, An input unit which receives commercial AC voltage from the outside and converts the DC into commercial DC voltages; A power transistor switched on / off by a PWM control signal; A transformer which receives a commercial DC voltage from the input unit in the primary winding and induces an AC voltage in the secondary winding by switching on / off of the power transistor; An output unit for converting an AC voltage input from the secondary side of the transformer into a DC voltage and outputting it to each circuit portion; A feedback unit for generating a feedback voltage by detecting a magnitude of a predetermined power supply voltage output from the output unit; A power controller configured to generate a PWM control signal based on the feedback voltage and supply the PWM control signal to the power transistor; And a power saving unit configured to supply or block an output voltage to each circuit unit by a second control signal for each power saving mode output from the second control unit. The method of claim 8, wherein the blocking unit, When the first control signal of the specific power saving mode is input from the wireless demodulator, the switching is turned on to cut off the supply of the feedback voltage to the power control part of the power supply unit, and is switched when the first control signal of the power saving mode other than the specific mode is received. A power saving system, characterized in that consisting of a switching element is turned off to supply the feedback voltage to the power control unit of the power supply unit. The method of claim 9 wherein the switching device, It is composed of photocoupler composed of light emitting diode and light receiving transistor with different ground, And a power saving mode control signal for the wireless demodulation unit connected to the transformer secondary side to a power unit connected to the transformer primary side. The method of claim 7, wherein the first control unit, A power saving system characterized by generating a control signal of a normal mode / suspend mode / off mode / mute mode. The method of claim 11, wherein the blocking unit, When the control signal of the off mode is received from the wireless demodulation unit, the operation of the power supply unit is cut off, when receiving a control signal of the normal mode, power saving mode or mute mode resumes the operation of the power supply unit.