KR20040029224A - Apparatus for controlling power of PDP TV - Google Patents

Abstract

PURPOSE: A device for controlling power of a PDP(Plasma Display Panel) TV is provided to detect a rush current, and to apply power to an address power unit and a sustain power unit even when a constant voltage generator fails, thereby preventing the address power unit and the sustain power unit from being damaged. CONSTITUTION: A power unit is comprised. A rectifier circuit(101) is comprised. A PFC(Power Factor Correction) unit(102) generates a preset constant voltage by using an output of the rectifier circuit(101). A rush controller(103) prevents a rush current from flowing into the PFC unit(102). A rush current detector(105) detects the rush current according to an output of the rush controller(103), and outputs a detection signal. A logic gate(106) controls the PFC unit(102), logically combines failed operation decision signals to decide whether the PFC unit(102) is normal, and controls an operation of the power unit according to combined results. The logic gate(106) comprises as follows. An inverter reverses the detection signal. An AND gate performs an AND operation for the failed operation decision signals and an output of the inverter.

Description

Power control device of PDTV {Apparatus for controlling power of PDP TV}

The present invention relates to a TV, and more particularly, to a power control apparatus for a PDP TV.

A TV is a video device that tunes and demodulates a broadcast signal according to a channel selected by a user from among broadcast signals transmitted from a broadcasting station, divides it into voice and video, and outputs it through a screen and a speaker through corresponding voice and image processing. In addition to the most widely used CRT, there are also TVs using LCD, PDP, etc. to satisfy the high quality / large screen characteristics.

In particular, in the case of PD TV, it is possible to manufacture considerably thinner than the existing CRT in terms of its structural characteristics and at the same time have excellent luminance characteristics compared to LCD, and has been spotlighted as the next generation TV.

However, due to the characteristics of PDP, high voltage is required during operation, so control of power-related configuration is one of the technical requirements for commercialization of PDTV.

At this time, looking at the schematic structure of the PDP, the upper plate and the lower plate is bonded to each other, the upper plate has a scan electrode and a sustain electrode formed in parallel with each other, and a dielectric layer and a protective film formed on the upper plate including the scan electrode and the sustain electrode. The lower plate includes an address electrode, a dielectric film formed on the front surface of the substrate including the address electrode, a partition formed on the dielectric film between the address electrodes, and a phosphor on the partition wall and the dielectric film surface in each discharge cell. In addition, the space between the upper plate and the lower plate is filled with a discharge gas mixed with an inert gas such as helium (He), xenon (Xe), and the like to form a discharge region.

The PD is discharged as a predetermined voltage is applied to the electrodes, and the phosphor is excited by the generated ultraviolet rays, thereby realizing color. Therefore, a module driving unit for controlling the drive of the PD module so that a predetermined voltage is applied to the electrode according to a predetermined timing.

Currently, there is a power factor correction (PFC) block for improving the power factor of the PDP. When AC voltage is applied, a voltage close to DC is transferred to the PFC block through the bridge rectifier circuit.

However, due to a sudden voltage change at the initial power-on of the set, a rush current flows in the circuit.

The rush current is spikey and adversely affects the components of the circuit.

Thus, the rush control circuit is composed of diodes to prevent the rush current from flowing to the PFC.

As shown in FIG. 1, the power control apparatus of PDTV according to the related art supplies power to essential components so that a user can respond to an operation command input by a user through a remote controller while the image is not displayed in standby mode. The rectifier circuit unit 11, a constant voltage generator 12 for generating a predetermined constant voltage (for example, 380V) by receiving operating power through the rectifier circuit unit 11, and generating a constant voltage for controlling the constant voltage generator. The control unit 14, the rush control unit 13 for controlling the rush current generated by a sudden change in the voltage to be applied to the initial power supply of the rectifier circuit unit 11, and transforms the constant voltage generated by the constant voltage generator 12 Va power supply unit 15 for supplying the address voltage Va for driving the address electrode of the PD module 19, Va control unit 17 for controlling the Va power supply unit 15, and A Vs power supply 16 for supplying a sustain voltage Vs for driving the sustain electrode of the PD module 19 by transforming a constant voltage generated by the voltage generator 12, and controlling the Vs power supply 16. It consists of the Vs control unit 18.

The power control operation of the PDTV according to the prior art configured as described above is as follows.

First, when the user 'turns on' the power using the remote controller, the current flows through the rush control unit 13 and no current flows when the user is in a normal state.

When the rush current flows to the rush controller 13 and is in the normal state, when the current flows to the constant voltage generator 12 and the constant voltage generator 12 operates normally by the constant voltage controller 14, the constant voltage generator ( 12) outputs 380V.

Subsequently, when a constant voltage of 380V is applied to the Va power supply unit 15 and the Vs power supply unit 16, the Va power supply unit 15 and the Vs power supply unit 16 operate to output 72V and 185V, respectively.

When the respective voltages are supplied to the PD module 19, a screen is displayed.

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

If the operation of the constant voltage generator is not normal, since the bridge rectified voltage flowing through the rush controller instead of the output of the constant voltage generator is generated, increase the switching frequency of the Va, Vs power controller to generate a voltage to supply the module. There is a problem affecting the heat generation and life of the device.

The present invention has been made to solve this problem, and provides a power control device of the PDP TV to detect the rush current to prevent damage to the circuit circuit of the Va, Vs power supply due to the application of an abnormal voltage to the Va, Vs power supply. Its purpose is to.

1 is a block diagram showing a power control device of a conventional PDP TV

2 is a block diagram showing a power control device of the PDP TV according to the present invention.

3 is a block diagram for logically explaining the operation of a power supply unit using a power supply control apparatus of a PDP TV according to the present invention.

Figure 4 is a flow chart showing the operation of the power supply unit using the power control device of the PDP TV according to the present invention

* Description of the symbols for the main parts of the drawings *

101: rectifier circuit portion 102: constant voltage generator

103: rush current control unit 104: constant voltage generation control unit

105: rush current detector 106: logic gate

107: address power supply 108: sustain power supply

109: address power control unit 110: sustain power control unit

111: PDP Module

PDP TV power supply control apparatus according to the present invention for achieving the above object is a constant voltage generator for generating a predetermined constant voltage by using the output of the power supply unit, rectifier circuit unit, the rectifier circuit unit, the rush current to the constant voltage generator A rush control unit for preventing the flow of the rush, a rush current extracting unit for detecting a rush current and outputting a detection signal according to the output of the rush control unit, and controlling the constant voltage generating unit and determining an abnormality in operation for determining an abnormality of the constant voltage generating unit. And a logic gate for controlling the operation of the power supply unit according to the result of the logical combination.

Referring to the accompanying drawings, a power control device for a PDP TV according to the present invention will be described in more detail.

Figure 2 is a block diagram showing a power supply control apparatus of the PDP TV according to the present invention, Figure 3 is a block diagram for logically explaining the operation of the power supply unit using the power control apparatus of the PDP TV according to the present invention.

As shown in FIG. 2, the power control apparatus of the PDP TV according to the present invention supplies power to essential components so that a user can respond to an operation command input by a user through a remote control while the standby mode is not displayed. The rectifier circuit unit 101, a constant voltage generator 102 for generating a predetermined constant voltage (for example, 380V) by receiving operating power through the rectifier circuit unit 101, and the constant voltage generator 102 Generated due to a sudden change in voltage when a constant voltage generation control unit 104 for controlling and outputting an operation abnormality determination signal for determining whether there is an abnormality of the constant voltage generator 102 and the initial power of the rectifier circuit unit 101 is applied. A rush control unit 103 for controlling a rush current to be output, a rush current detection unit 105 for outputting a detection signal according to detecting a current flowing through the rush control unit 103, and the rush current The logic gate 105 for logically connecting the signal detected by the detector 105 and the operation abnormality determination signal of the constant voltage generation controller 104 and the constant voltage generated by the constant voltage generator 102 are transformed to convert the PD module. The Va power supply unit 107 for supplying the address voltage Va for driving the address electrode 111 of the 111, the Va control unit 109 for controlling the Va power supply unit 107, and the constant voltage generator 102 are generated. The Vs power supply 108 supplies a sustain voltage Vs for driving the sustain electrode of the PD module 111 by transforming the constant voltage, and the Vs control unit 110 controls the Vs power supply 108.

Referring to the operation of the power control device of the PDP TV according to the present invention configured as described above are as follows.

First, when the user 'turns on' the power using the remote controller, the constant current generator 101 recognizes the power 'on' command received through the infrared receiver (not shown) and performs the procedure in a predetermined order in the preset control algorithm. Operate each component accordingly.

At this time, the operation of each component in a predetermined order is to prevent the occurrence of reliability degradation such as overload is applied to each component causing damage.

For this reason, when an AC input is applied to the initial PDP set, a rush current flows to the rush controller 103. The rush controller 103 is configured to protect the circuit from a large rush current.

When the initial power 'on' flows to the rush control unit 103, the current does not flow when the current is in a normal state.

However, when no current flows to the constant voltage generator 102 due to the abnormal operation of the constant voltage generator 102, the current flows to the rush controller 103.

At this time, the rush current detection unit 105 detects the current flowing to the rush control unit 103 and outputs a low signal.

The logic gate 106 may be configured to determine an operation abnormality determination signal output from the constant voltage generation controller 104 ('high' when normal and 'low' when abnormal) and a high / low signal detected by the rush current detector 105. Connect to so that the second constant voltage terminal is high only when the rush current signal is low.

This is because the rush current flows to the rush current detector 105 when the power is 'on' initially, so that the rush current is changed to a voltage value to 'off' the PDP TV set.

Therefore, the power input of the rush current detector 105 is taken from the Va and Vs 'on' signals, and the Va and Vs signals become high signals three seconds after the sub power 'on' signal, so the rush current at the initial power 'on' The malfunction of the rush current detector 105 can be prevented.

4 is a flowchart illustrating an operation of a power supply unit using a power supply control apparatus of a PDP TV according to the present invention.

Referring to FIG. 4, first, it is determined whether an AC current is applied (S101).

As a result of the determination, if the AC current is not applied, the PDP TV set is 'off', and if the AC current is applied, it is determined whether the address voltage and the sustain voltage are 'on' (S102) and the address voltage and the sustain voltage are If not, the PDP set is 'off', and if the address voltage and the sustain voltage is 'on', the signal of the rush current detection circuit is detected (S103).

When the signal of the rush current is high, the address voltage and the sustain voltage are 'off' (S105). When the signal of the rush current is 'low', the signal of the terminal of the first constant voltage generator is determined (S104).

As a result of the determination, when the signal of the first constant voltage generator terminal is 'high', the operation of the address voltage driver and the sustain voltage driver is 'on'.

The results of the above process can be configured in the following [Table 1].

Table 1

As described above, the power control method of the PDP monitor according to the present invention has the following effects.

The present invention can prevent damage to the circuits of the address power supply unit and the sustain power supply unit due to the voltage applied to the address power supply unit and the sustain power supply unit despite the failure of the constant voltage generation unit in the existing circuit.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (2)

Power supply; Rectification circuit section; A constant voltage generator for generating a predetermined constant voltage by using the output of the rectifier circuit unit; A rush controller to prevent a rush current from flowing to the constant voltage generator; A rush current extracting unit detecting a rush current according to the output of the rush control unit and outputting a detection signal; Logic combination for controlling the operation of the constant voltage generator and the operation abnormality determination signal for determining whether there is an abnormality of the constant voltage generator, and controlling the operation of the power supply unit according to the result controller The method of claim 1, The logic gate includes an inverter for inverting the detection signal and an AND gate for performing an AND operation on the output of the inverter and the operation abnormality determination signal.