KR100370046B1 - Apparatus for controlling power of video display system - Google Patents

Abstract

The present invention relates to a power supply control device of a video display device that applies standby power only to a keyboard and sequentially applies power to other load circuits according to a user's power-on signal input to increase standby power saving efficiency. Converts the DC power into a DC power supply and depressurizes to a predetermined level; A keyboard for outputting a power control signal according to whether a signal is applied, a first switching unit which is turned on / off according to a power control signal output from the keyboard, and supplies standby power from the first constant voltage unit, and the first switching unit A second switching unit which is turned on when standby power is supplied to the unit, and whether the first switching unit is turned on or off When a pre-power is supplied and standby power is supplied through the first switching unit, a microcomputer receives a power control signal from the keyboard through the second switching unit and controls various loads to be driven, and according to the control signal of the microcomputer. It is configured to include a second constant voltage unit for supplying power to the load, the standby power can be reduced by applying the standby power only to the keyboard and operating the microcomputer and other loads sequentially according to whether the power-on signal input by the user is input. It works.

Description

Apparatus for controlling power of video display system}

The present invention relates to an image display device, and more particularly, to a power control apparatus of an image display device for reducing standby power of the image display device.

In general, a video display device is a series of video signals of the video mode such as SVGA (800 × 600), XGA (1024 × 768), SXGA (1280 × 1024) transmitted from a video card of a PC or workstation This device displays on the screen through signal processing.

The PC is composed of a main body, a monitor, a peripheral device such as a printer, and a scanner, and the main body and the monitor have separate power control.

That is, in the case of the main body, the power is 'on' through the power switch and 'off' the power through software such as a system shutdown program or 'off' through the power switch.

On the other hand, the monitor is powered on / off through the power switch, and if there is no change in the image is programmed to operate in the power saving mode for the purpose of minimizing the power consumption.

Hereinafter, a power control apparatus for a video display device according to the related art will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a power control apparatus for a video display device according to the prior art, FIG. 2 is a diagram illustrating in detail the configuration of the keyboard shown in FIG. 1, and FIG. 3 is an input / output of each unit shown in FIG. 2. A diagram showing a waveform.

As shown in FIG. 1, an apparatus for controlling power of an image display apparatus according to the related art includes an adapter 10 for converting a commercial power source into a DC power source and reducing pressure, and a first constant voltage for reducing the output of the adapter 10 again. The unit 20, the keyboard 30, the microcomputer 40 and the standby operation unit 50 to receive the output power of the first constant voltage unit 20 to maintain a standby state, and through the keyboard 30 When the power on signal is applied, the microcomputer 40 receives the output signal and outputs a power control signal, and receives the power control signal to the second constant voltage unit 60 for supplying predetermined power to each peripheral circuit 70. It is composed.

As shown in FIG. 2, the keyboard 30 receives a pulse having a certain period and duty ratio from the microcomputer 40 and maintains a standby state. When the power on signal is applied from a user, the keyboard 30 outputs a power control signal to the microcomputer. A soft operation key 31 transmitted to 40 and a display unit 32 for displaying the power supply state in accordance with an output output from the display control unit 41 in response to the control signal of the microcomputer 40.

The soft operation key 31 includes a first diode D1 having a cathode connected to the first constant voltage unit 20, a cathode connected to an anode of the first diode D1, and an anode connected to the micom One end is connected to the second diode (D2) to be connected, the first capacitor (C1) one end is connected to the connection point of the first diode (D1) and the second diode (D2), and the first capacitor (C1) A first resistor R1 connected to a power-on switch (not shown) input by a user, a transistor Q1 having a base connected to the first capacitor C1, and the transistor Q1. A second resistor R2 having one end connected to a collector of the second resistor; a third resistor R3 having one end connected to the base of the transistor Q1 and the other end connected to an emitter of the transistor Q1; Zener diode ZD1 having a cathode connected to an emitter of transistor Q1, and the zener diode ZD1; 2 is composed of a D flip-flop 31a which receives the outputs of both ends of the resistor R2 to the data and clock pulse terminals.

Referring to the operation of the power control device of the video display device configured as described above are as follows.

First, the commercial power source is converted into a DC power source through the adapter 10, and the primary decompressed power is decompressed again through the first constant voltage unit 20, and then the keyboard 30, the microcomputer 40, and the standby operation. It is applied to the unit 50 to maintain the standby state at all times.

When the user applies a power on signal through the keyboard 30, the microcomputer 40 receives the input signal and outputs a power control signal to the second circuit 60 to the peripheral circuit 70. The predetermined power is supplied to allow the entire image display device to operate normally.

In the case of a commercially available general monitor, the standby operation unit 50 includes a plurality of circuits such as an analog switching unit, a synchronous separation unit, a TMDS receiving unit, a scaler, and an image signal processing unit.

Referring to the operation of the keyboard 30, first, a pulse having a constant period and duty ratio output from the microcomputer 40 is applied to the clear terminal C of the D flip-flop.

In the state where the power-on signal is not input, that is, the standby state, waveforms as shown in (b) and (c) of FIG. 3 are applied to the data input terminal D and the clock pulse input terminal CP of the D flip-flop 31a. Each of these is input and a waveform as shown in FIG. 3D is output from the D flip-flop 31a.

When the power-on signal is input, a waveform as shown in FIG. 3E is input to the data input terminal D of the D flip-flop 31a, and a clock pulse input terminal CP is input to the clock pulse input terminal CP. The waveform as shown in (f) is input, and the waveform opposite to the clock pulse input terminal CP is output from the output terminal of the D flip-flop 31a.

On the other hand, the display unit 32 interrupts the standby power, which is the output of the first constant voltage unit 20, through the display control unit 41 by the control signal of the microcomputer 40, thereby operating the normal operation mode, the power saving mode, and the power-off. The mode can be displayed. In general, the flashing of the diodes D4 and D5 in the display unit 32 is controlled by the following logical table.

mode Diode status Diode emitting color D4 D5 Normal operation On Off Green Power saving On On Amber Power off Off Off Off

As described above, the control apparatus of the image display apparatus according to the related art is converted from alternating current to direct current through the adapter 10 and the first reduced voltage is again decompressed through the first constant voltage unit 20 so that the keyboard 30 and the microcomputer The standby power is always applied to the 40 and the standby operation unit 50, and then a user applies a power-on signal defined at a predetermined logic level to the microcomputer 40 through the keyboard 30. Then, the microcomputer 40 outputs a power control signal defined at a predetermined level so that the second constant voltage unit 60 supplies predetermined power to each peripheral circuit 70 to perform normal operation of the entire image display device. Do it.

As described above, the power control apparatus of the image display apparatus according to the prior art has the following problems.

First, in order to wait for a power on signal, standby power must always be applied to the keyboard, the microcomputer, and the standby operation unit, thereby causing unnecessary power consumption.

Second, the microcomputer needs to perform its own test operation to check whether the power-on signal is input by the user's selection even when the power is off, resulting in much standby power consumption.

The present invention has been made to solve this problem, by applying the standby power only to the keyboard and by applying power to the other load circuit in sequence according to the user's power-on signal input to operate the standby power saving efficiency can be increased It is an object of the present invention to provide a power supply control apparatus for an image display device.

1 is a block diagram showing a power supply control apparatus for a video display device according to the prior art;

2 is a block diagram showing the configuration of a keyboard shown in FIG.

FIG. 3 is a diagram illustrating input / output waveforms of each unit illustrated in FIG. 2.

4 is a block diagram showing a power supply control apparatus for an image display apparatus according to the present invention.

5 is a block diagram showing the configuration of a keyboard shown in FIG.

Explanation of symbols for main parts of the drawings

100: adapter 200: first constant voltage portion

300: keyboard 301: soft touch key

301a: D flip-flop 302: display unit

400: first switching unit 500: microcomputer

600: second switching unit 700: standby operation unit

800: second constant voltage unit 900: peripheral circuit

An apparatus for controlling power of an image display apparatus according to the present invention for achieving the above object includes an adapter for converting commercial power into direct current power and reducing the pressure to a predetermined level; And a keyboard for receiving the output voltage of the constant voltage unit to maintain a standby state and outputting a power control signal according to whether a power-on signal input by the user is applied, and on / off according to a power control signal output from the keyboard. A first switching unit which supplies standby power from the first constant voltage unit, a second switching unit which is turned on when standby power is supplied to the first switching unit, and standby power depending on whether the first switching unit is on or off; When the standby power is supplied through the first switching unit, a power control signal is input from the keyboard through the second switching unit. Oh microcomputer for controlling various loads are to be driven and consists of including a second constant-voltage unit for supplying power to various loads in response to a control signal of the microcomputer has its features.

Hereinafter, a power control apparatus for an image display device according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing a power supply control apparatus of an image display device according to the present invention, Figure 5 is a block diagram showing the configuration of a keyboard shown in FIG.

As shown in FIG. 4, the apparatus for controlling power of an image display apparatus according to the present invention converts commercial power into direct current power and depressurizes the power to a predetermined level. A keyboard for receiving a first constant voltage unit 200 that depressurizes the output voltage of the first constant voltage unit 200 and maintaining a standby state, and outputting a control signal according to whether the user inputs a power-on signal. 300, a first switching unit 400 that is turned on / off according to a control signal output from the keyboard 300, and supplies power from the first constant voltage unit 200, and the first switching unit 400. When the power is supplied to the second switching unit 600 and the first and second switching unit 400, 600 is turned on receives the power-on signal through the keyboard 300 to power the various loads The microcomputer 500 for outputting a control signal and the first switching unit 400. The standby operation unit 600 performs a standby operation according to the operation of the) and the second constant voltage unit 800 for supplying power to the peripheral circuit 900 in accordance with the control signal of the microcomputer 500.

Here, the keyboard 300 receives a power supplied from the first constant voltage unit 200 and outputs a multivibrator 301 for outputting a pulse having a predetermined period and duty ratio, and a pulse output from the multivibrator 301. And a soft touch key 302 for outputting a power control signal according to a user's power-on signal, an integrator 303 for integrating the output of the soft touch key 302, and an output of the integrator 303. Toggle switch 304 for turning on / off and a delay unit 305 for outputting a power control signal output from the soft touch key 302 to the microcomputer 500 after a predetermined time elapses until the microcomputer 500 is powered on. ) And a display unit 306 displaying a power mode state under the control of the microcomputer 500.

In addition, the soft touch key 302 has a first diode D11 having a cathode connected to the first constant voltage unit 200, a cathode connected to an anode of the first diode D11, and the multivibrator 301. A second diode D12 having an anode connected thereto, a first capacitor C11 having one end connected to the multivibrator 301, and the other end connected to a cathode of the second diode D12; A first resistor R11 having one end connected to one capacitor C11 and the other end connected to a power on switch, and a transistor having a base connected to a connection point of the first capacitor C11 and the first resistor R11. Q11, a second resistor R12 having one end connected to a collector of the transistor, a third resistor R13 connected between a base and an emitter of the transistor Q11, and a transistor Q111. Zenerdio connects cathode to emitter And a D flip-flop 302a that receives the outputs of both ends of the second resistor R12 as data and clock pulses, and receives the output of the multivibrator 301 into the clear terminal C. do.

Meanwhile, the display unit 306 is connected to the fourth and fifth diodes D14 and D15 connected to the cathodes so that conduction is determined according to a signal output from the display control unit 510 according to the control signal of the microcomputer 500. It is composed.

The operation of the power control device of the image display device according to the present invention configured as described above is as follows.

The commercial power is converted into direct current power through the adapter 100, and the primary decompressed voltage is again decompressed through the first constant voltage unit 200, and then standby power is supplied to the keyboard 300.

At this time, when the user applies a power-on signal to the keyboard 300, the keyboard 300 outputs a predetermined power control signal to turn on the first switching unit 400 to the microcomputer 500 and the standby operation unit. The standby power output from the first constant voltage unit 200 is supplied to 700 and at the same time, the second switching unit 600 is turned on.

Subsequently, after a predetermined time until power is applied to the microcomputer 500, the keyboard 300 applies a power on signal to the microcomputer 500, and the microcomputer 500 receives the power on signal. Outputs a power control signal to the second constant voltage unit 800 to supply predetermined power to each peripheral circuit 900 so that the entire system can perform normal operation.

Meanwhile, the operation of the keyboard 300 will be described in detail as follows.

First, the DC voltage passing through the adapter 100 and the first constant voltage unit 200 is supplied to the keyboard 300 as standby power, so that the square wave oscillation is continued through the multivibrator 301 in the keyboard 300. A pulse having a constant period and duty ratio is applied to the clear terminal C of the D flip-flop 302a of the soft touch key 302.

When the user presses the power on switch, the soft touch key 302 instantaneously flows through the first resistor R11 and the third resistor R13 and the zener diode ZD11 through the finger. Capacitor C11 is charged to conduct transistor Q11.

When the transistor Q11 is turned on, a signal is input to the data terminal D and the clock pulse terminal CP of the D flip-flop 302a, and the output waveform of the D flip-flop 302a is divided into the integrator ( 303 and the delay unit 305 to turn on the first switching unit 400 to supply standby power output from the first constant voltage unit 200 to the microcomputer 500 and the standby operation unit 700. At the same time as supplying the second switching unit 600 is also turned on.

Subsequently, after a predetermined time until power is applied to the microcomputer 500 by the delay unit 305, the keyboard 300 transmits a power-on signal to the microcomputer 500 through the delay unit 305. The microcomputer 500 outputs a power control signal defined at a predetermined logic level to cause the second constant voltage unit 800 to supply predetermined power to each peripheral circuit 900 so as to display the entire image. To operate normally.

In addition, the toggle switch 304 operates as a toggle, and when the user applies a power-off signal through a predetermined key on the keyboard 300 in the power-on state, the input logic level to the toggle switch 304 is also high. Even when the motor is in a high state, the first switching unit 400 is turned off to cut off standby power from the first constant voltage unit 200 to the microcomputer 500 and the standby operation unit 700, and at the same time, the second switching unit 400 is turned off. Switch 600 also 'off'.

On the other hand, the display unit 306 is a display device indicating a current operation state, and in the case of a general monitor, the display control unit 510 receives the output of the first constant voltage unit 200 as a standby power by a control signal of the microcomputer 500. By intermittent operation, the normal operation mode, power saving mode, and power off mode can be displayed.

As described above, the power control apparatus of the image display device according to the present invention applies standby power only to the keyboard and detects the input of the power-on signal according to the user's selection to sequentially operate the microcomputer and other loads. There is an effect that can be reduced.

Claims (5)

An adapter for converting commercial power into direct current power and reducing the pressure to a predetermined level; A first constant voltage unit for depressurizing the power decompressed in the adapter again; A keyboard for receiving an output voltage of the constant voltage unit to maintain a standby state and outputting a power control signal according to whether a power-on signal input by a user is applied; A first switching unit turned on / off according to a power control signal output from the keyboard to supply standby power from the first constant voltage unit; A second switching unit which is turned on when standby power is supplied to the first switching unit; When standby power is supplied according to whether the first switching unit is turned on or off, and when standby power is supplied through the first switching unit, a power control signal is input from the keyboard through the second switching unit to control various loads to be driven. Micom; And, And a second constant voltage unit configured to supply power to various loads according to the control signal of the microcomputer. The method of claim 1, And a display control unit for controlling the output of the first constant voltage unit to display a power supply state according to the control signal of the microcomputer. The method of claim 1, The keyboard is A multivibrator receiving power from the first constant voltage unit and outputting a pulse having a predetermined period and a duty ratio; A soft touch key for receiving a pulse output from the multi-vibrator and outputting a power control signal according to a power-on signal of a user; An integrator that integrates the output of the soft touch key, Toggle switch to turn on / off according to the output of the integrator, A delay unit for outputting a power control signal output from the soft touch key to the micom after a predetermined time until power is input to the micom; And a display unit for displaying a power mode state according to the control of the microcomputer. The method of claim 3, wherein The soft touch key may include a first diode having a cathode connected to the constant voltage unit; A second diode having a cathode connected to the anode of the first diode and an anode connected to the multi-vibrator; A first capacitor having one end connected to the multi-vibrator and the other end connected to a cathode of the second diode; A first resistor having one end connected to the first capacitor and the other end connected to a power on switch; A transistor having a base connected to a connection point of the first capacitor and the first resistor; A second resistor having one end connected to the collector of the transistor; A third resistor connected between the base and the emitter of the transistor, A zener diode having a cathode connected to the emitter of the transistor; And a flip-flop for receiving the outputs of both ends of the second resistor as data and clock pulses, and receiving the output of the multivibrator at a clear terminal. The method of claim 3, wherein And the display unit is composed of a plurality of diodes connected with a cathode.