KR100670587B1 - A power-saving circuit in a video display system - Google Patents

Abstract

The present invention relates to a power saving circuit of an image display device.

The present invention generates a power supply voltage (Vb, Vc, Vd ...) to the power supply unit 21 for supplying to each system; A remote controller 22 for outputting the corresponding infrared signal by the user's key input; A first infrared receiver 23 which receives an infrared signal for power on / off from the remote controller 22 and converts it into an electrical signal; An operation controller (24) for operating / stopping the power supply unit (10) by an electrical signal input from the first infrared receiver (23); A starting resistor for supplying power to the first infrared receiver and the operation control unit while the power supply unit does not supply power; A second infrared receiver 25 which receives an infrared signal from the remote controller and converts the infrared signal into an electrical signal; It is composed of a microcomputer 26 that operates by the power supply voltage supplied from the power supply unit 21 and controls each part of the system by an electrical signal input from the second infrared receiver 25,

By receiving the power on / off signal from the remote controller, the power supply unit 21 is operated / stopped to stop all operations of the system including the microcomputer when the power is turned off, thereby minimizing power consumption when the power is turned off.

Video display device, power saving circuit, power on / off, remote control

Description

A power-saving circuit in a video display system

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 block diagram showing a power supply unit and its surroundings of a typical video display device;

4 is a circuit diagram of FIG.

5 is a block diagram showing a power saving circuit of an image display device according to the present invention;

6 is a circuit diagram of FIG. 5;

7 is an operating state diagram of FIG. 5;

8 is a block diagram showing a power saving circuit of an image display device according to the present invention;

9 is a circuit diagram of FIG. 8;

10 is an operational state diagram of FIG. 8.

* Names of symbols for main parts of the drawings

21,31: power supply 22,32: remote controller

23: first infrared receiver 24,34: operation control unit

25: second infrared receiver 26,36: microcomputer

33: infrared receiver 35: data transmission unit

COM: comparison means SW: switching means

The present invention relates to a power saving circuit of an image display device.

More particularly, the present invention relates to a power saving circuit of an image display device configured to receive a power on / off signal from a remote controller to operate / stop the power supply to stop all operations of the system when the power is off.

In general, a cathode ray tube (CRT) used in a video display device strikes a fluorescent substance of R, G, B (red, green, blue) coated with a different amount of electron beam on the surface of the cathode ray tube according to the intensity of the image signal. It uses the principle of emitting light of different brightness or color and is widely used because of its excellent price and display performance.

1 is a perspective view illustrating a general image display device, in which an image display device receives an image signal and a synchronization signal received from a computer and displays an image on a cathode ray tube screen.

2 is a block diagram of a general video display device, wherein the video display device includes a video amplifier 1, a power supply unit 2, a microcomputer 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 RGB image signal input from the computer is amplified through the video amplifier 1 and applied to the cathode terminal of the cathode ray tube CRT to be displayed on the screen.

At this time, in order to display the RGB image signal on the cathode ray tube (CRT) screen, by supplying 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 form a raster on the entire cathode ray tube screen. 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 part of the image display device such as a video amplifier 1, a microcomputer 3, a deflection unit 4, a heater, and the like.

FIG. 3 is a block diagram illustrating a power supply unit and a peripheral circuit of a general video display device, and FIG. 4 is a circuit diagram of FIG. 3. Referring to FIGS. Looking at it as follows.

1. Power on

When the power on / off button of the remote controller 12 is turned on, the microcomputer 16 detects it through the infrared receiver 15 and outputs a first level on / off control signal to the operation controller 14. The operation control unit 14 operates the main power supply unit 11 when the on / off control signal of the first level is input.

As a result, the power supply voltages Vb, Vc, and Vd generated from the main power supply 11 are supplied to the respective system parts, and thus, the system parts operate normally.

On the other hand, the microcomputer 16 and the infrared receiver 15 operate normally by the 5V power supply voltage Va output from the auxiliary power supply 12.

2. When power off

When the power on / off button of the remote controller 12 is turned off, the microcomputer 16 detects it through the infrared receiver 15 and outputs a second level on / off control signal to the operation controller 14. When the on / off control signal of the second level is received, the operation control unit 14 stops the operation of the main power supply unit 11.

As a result, the generation of the power supply voltages Vb, Vc, and Vd in the main power supply unit 11 is stopped, and each system unit stops operating.

On the other hand, since the microcomputer 16 and the infrared receiver 15 should always detect the input of the power on / off button in order to switch back from the power off state to the power on state, the microcomputer 16 even in the power off state. ) And the infrared receiver 15 should receive a power supply voltage 5V from the auxiliary power supply 12.

As described above, the conventional video display device has a problem in that the auxiliary power supply unit 12 must continue to operate even in the power off state, and the microcomputer 16 must continue to consume power.

In addition, a separate auxiliary power supply 12 is required to operate the microcomputer 16, which complicates the circuit and has a problem that switching noise occurs because switching is continued when the power is turned off.

Accordingly, the present invention has been made in order to solve the above problems, and receives the power on / off signal from the remote controller to operate / stop the power supply to stop all the operation of the system including the microcomputer when the power off It is an object of the present invention to provide a power saving circuit of a display device.

In order to achieve the above object, a power saving circuit of an image display device includes a power supply unit generating a power supply voltage and supplying the power supply to each system; A remote controller for outputting the corresponding infrared signal by the user's key input; A first infrared receiver which receives an infrared signal for power on / off from the remote controller and converts it into an electrical signal; An operation control unit which stores a reference signal corresponding to the power on / off and operates / stops the power supply unit when the electrical signal input from the first infrared receiver is matched with the reference signal; A starting resistor for supplying power to the first infrared receiver and the operation control unit while the power supply unit does not supply power; A second infrared receiver which receives the infrared signal from the remote controller and converts the infrared signal into an electrical signal; And a microcomputer operating by the power supply voltage supplied from the power supply unit to control each part of the system by an electrical signal input from the second infrared receiver.

In addition, a power saving circuit of another video display device according to the present invention for achieving the above object, the power supply unit for generating a power supply voltage to supply to each system; A remote controller for outputting the corresponding infrared signal by the user's key input; An infrared receiver for receiving an infrared signal from the remote controller and converting the infrared signal into an electrical signal; An operation control unit which stores a reference signal corresponding to the power on / off and operates / stops the power supply unit when an electrical signal input from an infrared receiver is matched with the reference signal; A starting resistor for supplying power to the infrared receiver and the operation controller while the power supply does not supply power; A microcomputer operating by a power supply voltage supplied from the power supply unit, and receiving an electrical signal from the infrared receiver to control each part of the system; It is connected between the infrared receiver and the microcomputer, characterized in that the data transmission unit for transmitting an electrical signal output from the infrared receiver of the primary side of the power supply to the microcomputer of the secondary side of the power supply.

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

FIG. 5 is a block diagram showing a first embodiment of a power saving circuit of an image display device according to the present invention, and FIG. 6 is a circuit diagram of FIG.

As shown in Figs. 5 and 6, the first embodiment according to the present invention comprises: a power supply unit 21 for generating power supply voltages Vb, Vc, Vd ... and supplying them to the respective systems; A remote controller 22 for outputting the corresponding infrared signal by the user's key input; A first infrared receiver 23 which receives an infrared signal for power on / off from the remote controller 22 and converts it into an electrical signal; An operation control unit (24) for storing a reference signal corresponding to the power on / off and operating / stopping the power supply unit when the electrical signal input from the first infrared receiver (23) matches the reference signal; A starting resistor for supplying power to the first infrared receiver 23 and the operation control unit 24 while the power supply unit 21 does not supply power; A second infrared receiver 25 which receives an infrared signal from the remote controller 22 and converts the infrared signal into an electrical signal; It is composed of a microcomputer 26 that operates by the power supply voltage supplied from the power supply unit 21 and controls each part of the system by an electrical signal input from the second infrared receiver 25.

Here, the power supply unit 21, the input unit for receiving the commercial AC voltage from the outside to convert the commercial DC voltage (Vi) (D1, R1, C1); A power transistor Q switched on / off by a PWM control signal; A transformer (T) for receiving a commercial DC voltage (Vi) from the input unit (D1, R1, C1) on the primary winding and inducing an AC voltage to the secondary winding by switching on / off of the power transistor (Q); An output unit (D2, C2, D3, C3) for converting the AC voltage input from the secondary side of the transformer (T) into DC voltages (Vb, Vc, Vd ...) and outputting them to the respective systems; A feedback unit (not shown) for generating a feedback voltage Vfb by sensing the magnitude of a predetermined power supply voltage output from the output units D2, C2, D3, and C3; The power control unit IC generates a PWM control signal based on the feedback voltage Vfb and supplies it to the power transistor Q.

In addition, the operation control unit 24, the comparison means (COM) for receiving an electrical signal from the first infrared receiver 23 and outputs a comparison signal of a high or low level compared with a reference signal; It is composed of a switching means (SW) for switching on / off by the high or low level comparison signal to supply / cut off the power supply voltage to the power control unit (IC), or electrical from the first infrared receiver 23 Counting means (COU) for receiving a counting signal and outputting a high or low level counting signal; It is composed of a switching means (SW) for switching on / off by the high or low level counting signal to supply / cut off the power supply voltage to the power control unit (IC), or electrical from the first infrared receiver 23 A microcomputer (MIC) for receiving a signal and outputting a high or low level control signal; Switching means (SW) for switching on / off by the high or low level control signal to supply / cut off the power supply voltage to the power control unit (IC).

Subsequently, the first embodiment according to the present invention will be divided into power on and power off and the operation thereof will be described with reference to FIG. 7.

7 is an operational state diagram of FIG. 5.

3. Power on

When the power-on key is input through the remote controller 22, the remote controller 22 converts the key input signal ("1011101") into an infrared signal and transmits it.
At this time, since there is no power supplied from the power supply unit 21 in the second infrared receiver 25, the infrared signal cannot be received, and only the first infrared receiver 23 can be received.

The first infrared receiver 23 receiving the infrared signal converts the received infrared signal into an electrical signal ("1011101") as shown in FIG. 7 (b) and outputs it to the operation controller 24. do.
The operation controller 24 checks whether the received signal is a power-on control signal by comparing the received signal with a reference signal, and does not perform any operation on a control signal other than the power-on / off control signal.

Accordingly, the operation control unit 24 operates the power supply unit 21 by the power-on signal, and the power supply voltages Vb, Vc, Vd ... generated from the power supply unit 21 include the microcomputer 26. Supplied to the system parts, the system parts including the microcomputer 26 operate normally.

At this time, if a key other than a power on / off key is input through the remote controller 22, for example, if a channel up / down key, a volume up / down key, etc. are input, the remote controller 22 receives the key input signal. (As shown in Fig. 7A), " 1000101 " and " 1111011 " are converted into an infrared signal and transmitted.

The second infrared receiver 25 receiving the infrared signal converts the received infrared signal back into an electrical signal ("1000101", "1111011", as shown in FIG. 7 (c)). 26),
The first infrared receiver 23 may also receive a control signal other than the power on / off control signal. However, a control signal other than the power on / off control signal received by the first infrared receiver 23 is transmitted to the operation controller 24, and the operation controller 24 compares the control signal with the reference signal and does not perform any operation. I never do that.

The microcomputer 26 receives a signal from the second infrared receiver 25 and adjusts channel up / down or volume up / down according to the received signal.
Of course, the microcomputer 26 has signal information about a preset control signal in order to perform an operation corresponding to the control signal input from the second infrared receiver 25. The microcomputer 26 compares the control signal input from the second infrared receiver 25 with the signal information and performs an operation such as channel up / down or volume up / down.

4. When power off

When the power-off key is input through the remote controller 22, the remote controller 22 converts the key input signal (" 1011101 ") into an infrared signal and transmits it.

The first infrared receiver 23 receiving the infrared signal converts the received infrared signal back into an electrical signal (“1011101”) as shown in FIG. 7 (b) and outputs it to the operation controller 24. do.
In this case, the second infrared receiver 25 may also receive the power off infrared signal. However, the second infrared receiver 25 transmits the power-off infrared signal to the microcomputer 26, and the microcomputer 26 does not perform any operation unless it compares with the power-off infrared signal and preset signal information. Do not. As a result, if the microcomputer 26 does not have information about power on / off in the preset signal information, the microcomputer 26 does not perform any operation even when the power off infrared signal is received.

As a result, the operation control unit 24 stops the operation of the power supply unit 21. Accordingly, the generation of the power supply voltages Vb, Vc, Vd... Each part of the system that is included stops working.

On the other hand, since the first infrared receiver 23 should always detect the input of the power on / off key in order to switch back from the power off state to the power on state, the first infrared receiver 23 may be in the power off state. Commercial power supply voltage is supplied through the starting resistor (R2).

At this time, the operation control unit 24 is composed of a comparison means (COM) and the switching means (SW), the comparison means (COM) by comparing the signal input from the first infrared receiver 23 and the reference signal is high or The power supply unit 21 is operated or stopped by switching on / off the switching means SW by outputting a low level comparison signal.

8 is a block diagram showing a second embodiment of a power saving circuit of an image display device according to the present invention, and FIG. 9 is a circuit diagram of FIG.

As shown in Figs. 8 and 9, the second embodiment according to the present invention includes: a power supply unit 31 for generating power supply voltages Vb, Vc, Vd, and supplying them to the respective systems; A remote controller 32 for outputting a corresponding infrared signal by a user's key input; An infrared receiver 33 which receives an infrared signal from the remote controller 32 and converts the infrared signal into an electrical signal; An operation control unit (34) for storing a reference signal corresponding to the power on / off and operating / stopping the power supply unit (31) when the electrical signal input from the infrared receiver (33) matches the reference signal; A starting resistor for supplying power to the infrared receiver 33 and the operation control unit 34 while the power supply unit 31 does not supply power; A microcomputer (36) operating by a power supply voltage supplied from the power supply unit (31) and receiving an electrical signal from the infrared receiver (33) to control each part of the system; A microcomputer connected between the infrared receiver 33 and the microcomputer 36 to output an electrical signal output from the infrared receiver 33, which is the primary side of the power supply 31, to the secondary side of the power supply 31. And a data transmission section 35 for forwarding to 36).

Here, the power supply unit 31 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 Q switched on / off by a PWM control signal; A transformer (T) for receiving a commercial DC voltage (Vi) from the input unit (D1, R1, C1) on the primary winding and inducing an AC voltage to the secondary winding by switching on / off of the power transistor (Q); An output unit (D2, C2, D3, C3) for converting the AC voltage input from the secondary side of the transformer (T) into direct current voltages (Vb, Vc, Vd ...) and outputting them to the respective systems; A feedback unit (not shown) for generating a feedback voltage Vfb by sensing the magnitude of a predetermined power supply voltage output from the output units D2, C2, D3, and C3; The power control unit IC generates a PWM control signal based on the feedback voltage Vfb and supplies it to the power transistor Q.

In addition, the operation control unit 34, the comparison means (COM) for receiving an electrical signal from the infrared receiver 33 and outputs a comparison signal of a high or low level compared with a reference signal; It is composed of a switching means (SW) for switching on / off by the high or low level comparison signal to supply / cut off the power supply voltage to the power control unit (IC), or the electrical signal from the infrared receiver 33 Counting means (COU) for receiving the input and counting and outputting a high or low level counting signal; It is composed of a switching means (SW) for switching on / off by the high or low level counting signal to supply / cut off the power supply voltage to the power control unit (IC), or the electrical signal from the infrared receiver 33 A microcomputer (MIC) which receives an input and outputs a high or low level control signal; Switching means (SW) for switching on / off by the high or low level control signal to supply / cut off the power supply voltage to the power control unit (IC).

In addition, the data transmission unit 35 is composed of a light emitting diode PC1 and a light receiving transistor PC2 having different grounds, and receives an electrical signal input from the infrared receiver 33 to the light emitting diode PC1. And a photocoupler that outputs to the microcomputer 36 through PC2).

Subsequently, a second embodiment according to the present invention is divided into power on and power off and the operation thereof will be described with reference to FIG. 10.

10 is an operational state diagram of FIG. 8.

5. Power on

When the power-on key is input through the remote controller 32, the remote controller 32 converts the key input signal (" 1011101 ") into an infrared signal and transmits it.
The infrared receiver 33 receiving the infrared signal converts the received infrared signal into an electrical signal (“1011101”) as shown in FIG. 10 (b) and outputs the converted infrared signal to the operation controller 34.
In this case, since power is supplied only to the infrared receiver 33 and the operation controller 34, the infrared receiver 33 may receive a power-on control signal.
Since the data transmission unit 35 is not in a state where power is being supplied, no operation can be performed.

delete

Accordingly, the operation controller 34 receives the infrared signal from the infrared receiver 33 to operate the power supply 31, and the power voltages Vb, Vc, Vd ... generated from the power supply 31 are Supplied to the system parts including the microcomputer 36, the system parts including the microcomputer 36 operate normally. At this time, the data transmission unit 35 is in a state capable of receiving a signal from the infrared receiver 33.

At this time, if a channel up / down key, a volume up / down key, etc. are input through the remote controller 32, the remote controller 32 may input the key input signal (“1000101” as shown in FIG. 10 (a)). , "1111011" is converted into an infrared signal and transmitted.

The infrared receiver 33 receiving the infrared signal converts the received infrared signal into an electrical signal ("1000101", "1111011", as shown in FIG. 10 (b)) and transmits the data 35. )
At this time, the operation controller 34 may also receive infrared signals corresponding to the channel up / down keys and the volume up / down keys from the infrared receiver 33, but if not compared with the reference signal, no operation is performed.

The data transmission unit 35 is a photocoupler PC2 composed of a light emitting diode PC1 and a light receiving transistor having grounds separated from each other, and thus has an electrical form generated from an infrared receiver 35 that is a primary side of a transformer T. A signal ("1000101", "1111011") is transmitted to the microcomputer 36 which is the secondary side of the transformer T as shown in Fig. 10 (c).

Accordingly, the microcomputer 36 adjusts channel up / down or volume up / down.

6. When power off

When the power off key is input through the remote controller 32, the remote controller 32 converts the key input signal (" 1011101 ") into an infrared signal and transmits it.

The infrared receiver 33 receiving the infrared signal converts the received infrared signal back into an electrical signal (“1011101”) as shown in FIG. 10 (b) and outputs it to the operation controller 34.
In this case, the data transmitter 35 may also receive a power off infrared signal. The data transmitter 35 transmits the power-off infrared signal to the microcomputer 36, and the microcomputer 36 compares the power-off infrared signal with preset signal information and does not perform any operation unless it matches. As a result, if the microcomputer 36 does not have information about power on / off in the preset signal information, the microcomputer 36 does not perform any operation even when the power off infrared signal is received.
Accordingly, the operation control unit 34 stops the operation of the power supply unit 31, and thus, the generation of the power supply voltages Vb, Vc, Vd ... is stopped in the main power supply unit 31, thereby operating the microcomputer 36. Each part of the system that is included stops working.

delete

On the other hand, since the infrared receiver 33 must always detect the input of the power on / off key in order to switch back from the power off state to the power on state, the infrared receiver 33 is started with a starting resistor R2 even in the power off state. ) Is supplied with commercial power supply voltage.

At this time, the operation control unit 34 is composed of a comparison means (COM) and the switching means (SW), the comparison means (COM) by comparing the signal input from the infrared receiver 33 and the reference signal high or low level By outputting a comparison signal of the switching means (SW) to switch on / off, the power supply unit 31 is operated or stopped.

As described above, the circuit according to the present invention receives the power on / off signal from the remote controller and operates / stops the power supply unit 21 to stop all operations of the system including the microcomputer 26 when the power is turned off. Therefore, the effect is to minimize the power consumption when the power off.

Claims (11)

A power supply unit which generates a power supply voltage and supplies the power to each system; A remote controller for outputting the corresponding infrared signal by the user's key input; A first infrared receiver which receives an infrared signal for power on / off from the remote controller and converts it into an electrical signal; An operation control unit which stores a reference signal corresponding to the power on / off and operates / stops the power supply unit when the electrical signal input from the first infrared receiver is matched with the reference signal; A starting resistor for supplying power to the first infrared receiver and the operation control unit while the power supply unit does not supply power; A second infrared receiver which receives the infrared signal from the remote controller and converts the infrared signal into an electrical signal; And a microcomputer operating by a power supply voltage supplied from the power supply unit and controlling each part of the system by an electrical signal input from the second infrared receiver. The method of claim 1, wherein the power supply unit, An input unit which receives a commercial AC voltage from the outside and converts the AC into a commercial DC voltage; A power transistor switched on / off by a PWM control signal; A transformer that receives a commercial DC voltage from the input unit to the primary winding and induces an AC voltage to the secondary winding by switching on / off of the power transistor; An output unit converting an AC voltage input from the secondary side of the transformer into a DC voltage and outputting the DC voltage to each system; A feedback unit for generating a feedback voltage by sensing a magnitude of a predetermined power supply voltage output from the output unit; And 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. The method of claim 2, wherein the operation control unit, Comparison means for receiving an electrical signal from the first infrared receiver and comparing the reference signal with a reference signal to output a high or low level comparison signal; And switching means for switching on / off by the high or low level comparison signal and supplying / blocking a power voltage to the power control unit. The method of claim 2, wherein the operation control unit, Counting means for receiving an electrical signal from the first infrared receiver and counting the output signal to output a high or low level counting signal; And switching means for switching on / off by the high or low level counting signal to supply / block a power supply voltage to the power supply control unit. The method of claim 2, wherein the operation control unit, A microcomputer which receives an electrical signal from the first infrared receiver and outputs a high or low level control signal; And switching means for switching on / off by the high or low level control signal to supply / block a power supply voltage to the power control unit. A power supply unit which generates a power supply voltage and supplies the power to each system; A remote controller for outputting the corresponding infrared signal by the user's key input; An infrared receiver for receiving an infrared signal from the remote controller and converting the infrared signal into an electrical signal; An operation control unit which stores a reference signal corresponding to the power on / off and operates / stops the power supply unit when an electrical signal input from an infrared receiver is matched with the reference signal; A starting resistor for supplying power to the infrared receiver and the operation controller while the power supply does not supply power; A microcomputer operating by a power supply voltage supplied from the power supply unit, and receiving an electrical signal from the infrared receiver to control each part of the system; And a data transmission unit connected between the infrared receiver and the microcomputer to transfer an electrical signal output from the infrared receiver, which is the primary side of the power supply, to the microcomputer, which is the secondary side of the power supply. Power saving circuit. The method of claim 6, wherein the power supply unit, An input unit which receives a commercial AC voltage from the outside and converts the AC into a commercial DC voltage; A power transistor switched on / off by a PWM control signal; A transformer that receives a commercial DC voltage from the input unit to the primary winding and induces an AC voltage to the secondary winding by switching on / off of the power transistor; An output unit converting an AC voltage input from the secondary side of the transformer into a DC voltage and outputting the DC voltage to each system; A feedback unit for generating a feedback voltage by sensing a magnitude of a predetermined power supply voltage output from the output unit; And 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. The method of claim 7, wherein the operation control unit, Comparison means for receiving an electrical signal from the infrared receiver and comparing the reference signal with a reference signal to output a high or low level comparison signal; And switching means for switching on / off by the high or low level comparison signal and supplying / blocking a power voltage to the power control unit. The method of claim 7, wherein the operation control unit, Counting means for receiving an electrical signal from the infrared receiver and counting the output signal to output a high or low level counting signal; And switching means for switching on / off by the high or low level counting signal to supply / block a power supply voltage to the power supply control unit. The method of claim 7, wherein the operation control unit, A microcomputer which receives an electrical signal from the infrared receiver and outputs a high or low level control signal; And switching means for switching on / off by the high or low level control signal to supply / block a power supply voltage to the power control unit. The method of claim 7, wherein the data transmission unit, And a photocoupler configured to include a light emitting diode and a light receiving transistor having different grounds, and to output an electrical signal input from the infrared receiver to the light emitting diode to a microcomputer through the light receiving transistor.

Images