KR20000050590A - Apparatus and Method for Controlling inrush current of Monitor - Google Patents

Abstract

PURPOSE: An inrush current control apparatus and a method of the same are provided for decreasing a product price and power consumption by decreasing the size of an initial inrush current by more than 50%, eliminating noise and a potential defect factor and enhancing a competitiveness of a product. CONSTITUTION: A synchronous signal switch(11) prevents a vertical/horizontal synchronous signal from being supplied to a CRT(Cathode Ray Tube) from a PC(1) through a signal cable(3) in an initial power ON state. A color signal detector(12) detects whether a color signal is supplied through the signal cable(3). A power detector(13) detects a power supply state from the PC(1). A synchronous signal detector(11) detects a vertical/horizontal synchronous signal input state from the PC(1).

Description

Apparatus and Method for Controlling inrush current of Monitor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor, and more particularly, to an apparatus and method for controlling inrush current of a monitor for controlling inrush current generated when a power is 'on'.

As shown in FIG. 1, the video signal and power connection state of the monitor 2 will be described. The power supply for the operation of each part of the monitor 2 is supplied via the power cable 4 drawn from the PC 1. The color signal () and the vertical / horizontal synchronization signal and other signals are supplied from the PC 1 via the signal cable 3.

The screen is displayed according to the power supplied from the PC 1 and the color signal and the vertical / horizontal synchronization signal.

At this time, when the power of the monitor is 'on' for the first time, since the main body of the PC 1 supplies power and color signals and vertical / horizontal synchronization signals to the monitor 2 at the same time, a very large inrush current flows in the monitor 2.

For example, an average of 40-50A flows in a 15-inch monitor and an inrush current of 80-90A flows in a 17-inch monitor. Such inrush currents may directly or indirectly damage internal components.

Therefore, monitors are using expensive components to cope with such high inrush current, and according to the development of multimedia, consumer's tendency of large monitor is rapidly increasing. Therefore, technology development to control initial inrush current is urgently needed. This situation is required.

In addition, the internal parts of the monitor 2 are surrounded by a metal case for the purpose of preventing damage due to electromagnetic, etc., and the initial power is supplied to solve the color bleeding due to the magnetic field formed on the screen to surround the metal case. A de-gaussing coil is provided to apply a high voltage to the screen whenever it is 'on', and the vibration of the high voltage is applied to the degaussing coil is applied to the metal case, causing the ringing of the metal case to 'bounce'. Sound is generated.

The monitor according to the prior art has the following problems.

First, the price of the product increases because expensive components are used to cope with damage of internal components due to the initial inrush current.

Second, the inrush current causes current shock to the SMPS secondary components, providing a potential failure factor.

Third, the vibration of the degaussing coil is applied to the metal case when the initial power is 'on' to generate noise causing consumer anxiety.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and to provide an inrush current control apparatus and method for reducing the initial inrush current and to remove the noise that causes consumer insecurity. There is this.

1 is a perspective view showing a power and video signal connection configuration of a general monitor

Figure 2 is a block diagram showing the configuration of the inrush current control apparatus of the monitor according to the present invention

3 is a flowchart illustrating a method of controlling inrush current of a monitor according to the present invention.

Explanation of symbols for main parts of the drawings

1: PC2: monitor

3: signal cable 4: power cable

11: synchronization signal switching unit 12: color signal detection unit

13: power detector 14: synchronization signal detector

15: Micom 16: DPM switching unit

An inrush current control apparatus for a monitor according to the present invention includes a color signal detector for detecting an RGB color signal input, a power detector for detecting power input, a sync signal detector for detecting vertical and horizontal sync signal input, and a control signal according to a control signal. DPM switching unit for switching the operation state to DPM mode, synchronization signal switching unit for blocking the vertical / horizontal synchronization signal input from the PC to the CPT according to the control signal, and vertical / horizontal synchronization signal at the initial power supply to the CPT. The control signal to cut off the supply is output to the synchronous signal switching unit and the control signal is applied to the DPM switching unit to operate the monitor in DPM mode. The control signal is applied to the affected part so that the vertical / horizontal sync signal is supplied to the CPT and the control signal is sent to the It is characterized in that it is configured to include a microcomputer to release the DPM mode by applying.

The inrush current control method of the monitor according to the present invention comprises the steps of blocking the vertical / horizontal synchronization signal and operating in the DPM mode when the initial power is supplied, by supplying the color signal and the vertical / horizontal synchronization signal after the set time and release the DPM mode Characterized in that it comprises a step of operating normally.

Hereinafter, a preferred embodiment of an inrush current control apparatus and method of a monitor according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the configuration of the inrush current control apparatus of the monitor according to the present invention, Figure 3 is a flow chart showing a method of controlling the inrush current of the monitor according to the present invention.

As shown in FIG. 2, the monitor according to the present invention prevents the vertical / horizontal synchronization signal from being supplied to the CRT (Cathode Ray Tub) through the signal cable 3 from the PC 1 when the initial power is 'on'. Color signal detection unit 12 for detecting whether a color signal is supplied through the synchronization signal switching unit 11, signal cable 3, power detection unit 13 for detecting power supply from the PC 1, and PC (1). A synchronization signal detection unit 11 for detecting whether the vertical / horizontal synchronization signal is inputted from the control unit, and a DPM switching unit 16 for switching the display power management (DPM) mode of the monitor to an operating state or a canceled state according to a control signal. When the power of the monitor 2 is 'on', the control signal for blocking vertical / horizontal synchronization signals is output to the synchronization signal switching unit 11, and the synchronization signal detection unit 14, the color signal detection unit 12, and the power detection unit 13 Outputting a control signal for controlling the DPM switching unit 16 according to the output of It is comprised including the microcomputer 15.

In general, when the monitor is not used, that is, there is no change in the representation image, the monitor operates in the DPM mode (Display Power Management Mode) to minimize power consumption.

At this time, the DPM mode determines the presence of the vertical and horizontal synchronous signals, and if the vertical and horizontal synchronous signals are not input, it is determined that the monitor 2 is not used to supply power only to the essential components for operation standby and other components. In particular, as an operation mode that cuts off the power supply to components such as heaters and deflection ICs, which consume large power, it is divided into a suspend / stand-by mode and an off mode.

The inrush current control method of the monitor according to the present invention configured as described above will be described with reference to FIG. 3.

First, when the power of the PC 1 is 'on', power is supplied to the monitor 2, and when the signal cable 3 is connected while the power of the monitor 2 is 'on', the color signal is transmitted from the PC 1. And a vertical / horizontal sync signal.

The microcomputer 15 determines whether the power switch of the monitor 2 is 'on' (S11). When the power switch of the monitor 2 is 'on', the microcomputer 15 applies a control signal to operate the synchronization signal switching unit 11. Switch to the vertical / horizontal sync signal blocking state (S12).

Therefore, the vertical / horizontal synchronization signal supply from the PC 1 to the monitor 2 is cut off.

At the same time, a control signal is applied to the DPM switching unit 16 to operate the monitor 2 in the DPM mode (S13).

After waiting for the set time, that is, 0.5 seconds to 1 second (S14), it is determined whether the color signal and the synchronization signal are currently supplied from the PC 1 (S15).

Subsequently, when the color signal and the vertical / horizontal synchronization signal are supplied from the PC 1, the determination signal (S15) switches the synchronization signal switching unit 11 to the signal supply state (S16) to synchronize the vertical / horizontal synchronization with the monitor 2. The signal is supplied, and the control signal is applied to the DPM switching unit 16 to release the DPM mode (S17).

At this time, since the vertical / horizontal sync signal is supplied to the monitor 2 after 0.5 seconds to 1 second after the power and color signals are applied, the actual inrush current is reduced by about 50% or more. The size is 30 to 40A.

In addition, the monitor was preheated by the initial power supply, reducing the ringing of the metal casing due to the vibration of the degaussing coil.

Subsequently, the monitor 2 receives a color signal and a vertical / horizontal synchronization signal and displays a corresponding screen to operate normally (S18).

When the DPM mode operation command is input by the user, the DPM switching unit 16 is controlled to operate the monitor 2 in the DPM mode.

The inrush current control device and method of the monitor according to the present invention has the following effects.

First, since the initial inrush current was reduced by more than 50%, the current shocks on the power supply and various parts of the secondary side of the SMPS were reduced to less than 1/2 to eliminate potential defects.

Second, the user's dissatisfaction can be eliminated by removing noise that creates consumer anxiety caused by the degaussing coil.

Third, the inrush current is reduced, so that the product price can be lowered by using a low-cost part with a small rated current capacity, and the power consumption can be lowered, thereby improving the competitiveness of the product.

Claims (3)

In the monitor, Color signal detection unit for detecting whether the RGB color signal input, A power detector detecting whether power is input; Sync signal detector for detecting the input of vertical and horizontal sync signal, DPM switching unit for switching the operation state of the monitor to the DPM mode according to the control signal, A synchronization signal switching unit for blocking the vertical / horizontal synchronization signal input from the PC from being supplied to the CPT according to the control signal; Output the control signal to cut off the vertical / horizontal sync signal from the CPT during initial power supply to the sync signal switch, and apply the control signal to the DPM switch to operate the monitor in DPM mode. After that, according to the output of the color signal detection unit and the synchronization signal detection unit, a control signal is applied to the synchronization signal switching unit so that the vertical / horizontal synchronization signal is supplied to the CPT, and a microcomputer that releases the DPM mode by applying the control signal to the DPM switching unit. Inrush current control device of the monitor, characterized in that configured to include. In the monitor, Blocking the vertical / horizontal sync signal when the initial power is supplied and operating in the DPM mode, And a normal operation by supplying a color signal and a vertical / horizontal synchronization signal after the set time and releasing the DPM mode. The method of claim 2, The set time is a rush current control method of the monitor, characterized in that 0.5 seconds to 1.0 seconds.