KR20050114157A - Power supply device for plasma display panel and plasma display pane comprising the same - Google Patents

Abstract

The power supply apparatus of the plasma display panel according to the present invention comprises: an input power source for supplying power required in the plasma display panel; A transformer unit having a primary side of a single winding and a secondary side of a structure in which a plurality of windings are stacked in series, and outputting a DC voltage transformed by a winding ratio with the primary side for each layer of the secondary side; An output unit having an output terminal drawn out for each of the high level ports of the DC voltage output from the respective layers on the secondary side; An output voltage controller configured to detect a voltage at a maximum voltage output terminal among the output voltages, and generate a control signal by comparing the detected result with a reference signal; And a switching unit configured to apply / block the input power to the primary side of the transformer unit according to the control signal.

In the conventional power supply structure, a separate converter is provided for each power output required in the plasma display panel, thereby increasing the number of components, increasing the cost, complexity of the circuit, and size of the circuit board.

The power supply of the present invention includes only one transformer and one output voltage control circuit having a primary side of a single winding and a secondary side of a structure in which multiple windings are stacked in series. Therefore, according to the present invention, a circuit simplification of the power supply device is realized, thereby reducing the manufacturing cost of the plasma display panel and reducing the circuit board size.

Description

Power supply of plasma display panel and plasma display panel having same {Power supply device for plasma display panel and plasma display pane comprising the same}

The present invention relates to a display panel, such as a plasma display panel (PDP), and more particularly to a power supply for a display panel.

1 is a view showing the structure of a conventional three-electrode surface discharge plasma display panel.

Referring to FIG. 1, between the front and rear glass substrates 100 and 106 of a conventional surface discharge plasma display panel 1, address electrode lines A ₁ , A ₂ ,..., A _m , Dielectric layers 102 and 110, Y electrode lines Y ₁ , ..., Y _n , X electrode lines X ₁ , ..., X _n , fluorescent layer 112, barrier rib 114, and As a protective layer, the magnesium monoxide (MgO) layer 104 is provided, for example. The plasma forming gas is sealed in the discharge space 108.

2 illustrates a general driving device of the plasma display panel of FIG. 1.

Referring to the drawings, a typical driving device of the plasma display panel 1 includes an image processor 200, a controller 202, an address driver 206, an X driver 208, and a Y driver 204. The image processing unit 200 converts an external analog image signal into a digital signal, and internal image signals, for example, 8-bit red (R), green (G) and blue (B) image data, clock signals, vertical and horizontal, respectively. Generate synchronization signals. The controller 202 generates the driving control signals SA, SY, and SX according to the internal image signal from the image processor 200. The address driver 206 processes the address signal SA among the drive control signals SA, SY, and SX from the controller 202 to generate a display data signal, and generates the display data signal through the address electrode lines. To apply. The X driver 208 processes the X driving control signal SX among the driving control signals SA, SY, and SX from the controller 202 and applies the X driving control signal SX to the X electrode lines. The Y driver 204 processes the Y driving control signal SY among the driving control signals SA, SY, and SX from the controller 202 and applies the Y driving control signal SY to the Y electrode lines.

As a driving method of the plasma display panel 1 having the structure described above, an address-display separation driving method which is mainly used is disclosed in US Pat.

FIG. 3 is a timing diagram illustrating an example of a driving signal of the panel shown in FIG. 1. The address electrode A, the common electrode X, and the scan electrode in one subfield SF in the ADS driving method of the AC PDP. The drive signal applied to (Y1 to Yn) is shown. Referring to FIG. 3, one subfield SF includes a reset period PR, an address period PA, and a sustain discharge period PS.

The reset period PR initializes the wall charge state of all cells by applying reset pulses to the scan lines of all groups and forcibly performing a write discharge. In the address period PA, the bias voltage Ve is applied to the common electrode X, and the scan electrodes Y1 to Yn and the address electrodes A1 to Am are simultaneously turned on at the cell positions to be displayed, thereby displaying the display cells. Select. After the address period PA is performed, the sustain pulse Vs is alternately applied to the common electrodes X and the scan electrodes Y1 to Yn to perform the sustain discharge period PS. In PDP, the brightness is adjusted by the number of sustain discharge pulses.

2 and 3, the Y driving unit 204 requires a logic power source, a reset power source (Vs, Vset), a scan power source (V _SC-H , V _SC-L ), a holding power source (V _S ), and the like. do. X driving unit 208, require a logic power supply, X bias power source (Ve), holding power (V _S) and the like. In addition, the address driver 206 needs an address power source Va.

4 is a block diagram illustrating an example configuration of a power supply unit, and includes a rectifier 500, a power factor correction unit 502, and a DC / DC converter 504.

The rectifier 500 includes a rectifier circuit such as a bridge diode to convert an input AC voltage into a rectified voltage V _REC .

The power factor correction unit 502 includes a power factor correction circuit including an inductor, a diode, a capacitor, and a switch to minimize waste of power consumption. In addition, the power factor correction unit 502 normally boosts the voltage and supplies it to the DC / DC converter 504. A typical internal circuit of the power factor correction unit 502 is illustrated in FIG.

The DC / DC converter 504 outputs a plurality of DC power supplies V1, V2, ..., Vn required by the system. To this end, several DC / DC converters having different conversion ratios may be provided. Here, the plurality of DC output power sources V1, V2, .., Vn are the reset power sources Vs and Vset, the scan power sources V _SC-H and V _SC-L , the holding power source V _S , and the reset. The erase power Ve applied to the X electrode in the period PR, the bias power Vb applied to the X electrode in the address period PA, Vb = Ve in FIG. 3, the address power Va, and the like. .

FIG. 6 is a block diagram illustrating a conventional internal block diagram of the DC / DC converter 504 of FIG. 4. In order to generate several DC output powers V1, V2, ..., Vn, several DC / DC converters 504-1 ... 504-n are provided.

FIG. 7 is a circuit diagram illustrating a conventional DC / DC converter of FIG. 6.

The voltage Vpfc input to the DC / DC converter 504-n is transformed at a predetermined rate by the transformer 800, and is a secondary provided with a diode 802, a smoothing capacitor 804, and a resistor 806. The output voltage Vn is converted via a circuit.

The output voltage is divided into reference voltages by the distribution resistors 808 and 810 and input to the PWM control unit 812. The PWM controller 812 outputs a switching control signal pulse-width modulated according to the input reference voltage. By the on / off control of the switch 814 in accordance with this switching control signal, the level of the output voltage Vn is adjusted.

The above-described conventional power supply structure includes a conversion unit 504-1 to 504-n for each power output, thereby increasing the number of components, increasing the cost, complexity of the circuit, and increase of the circuit board size. There are disadvantages.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a power supply device for a plasma display panel having a new configuration and a plasma display panel having the same.

According to an aspect of the present invention, there is provided a power supply apparatus for a plasma display panel, including: an input power source for supplying power required by the plasma display panel; A transformer unit having a primary side of a single winding and a secondary side of a structure in which a plurality of windings are stacked in series, and outputting a DC voltage transformed by a winding ratio with the primary side for each layer of the secondary side; An output unit having an output terminal drawn out for each of the high level ports of the DC voltage output from the respective layers on the secondary side; An output voltage controller configured to detect a voltage at a maximum voltage output terminal among the output voltages, and generate a control signal by comparing the detected result with a reference signal; And a switching unit configured to apply / block the input power to the primary side of the transformer unit according to the control signal.

The output unit may output the sustain discharge voltage and the address voltage of the plasma display panel driven by the drive signal of the address-display separation driving method.

Plasma display panel according to the present invention for achieving the above technical problem, the rectifying unit for converting the input AC power to a rectified voltage; A power factor correction unit for converting the rectified voltage into a power factor corrected voltage; A transformer unit having a primary side of a single winding and a secondary side of a structure in which a plurality of windings are stacked in series, and outputting a DC voltage transformed by a winding ratio with the primary side for each layer of the secondary side; An output unit having an output terminal drawn out for each of the high level ports of the DC voltage output from the respective layers on the secondary side; An output voltage controller configured to detect a voltage at a maximum voltage output terminal among the output voltages, and generate a control signal by comparing the detected result with a reference signal; And a switching unit which applies / blocks the power factor corrected voltage to the primary side of the transformer unit according to the control signal, and is driven by the plurality of output terminal voltages.

The output unit may output the sustain discharge voltage and the address voltage of the plasma display panel driven by the drive signal of the address-display separation driving method.

Hereinafter, a configuration and an operation of a power supply apparatus for a plasma display panel and a plasma display panel having the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 8 is a simplified circuit diagram illustrating a power supply apparatus for a plasma display panel according to an exemplary embodiment of the present invention, wherein an input power source V _IN , a switching unit 902, an output voltage control unit 904, and a voltage transformer are illustrated. And output terminals V ₁ to V _n .

In the present invention, the transformer unit includes one primary winding N ₁ and a plurality of stacked secondary windings N _2-1 to N _2-n .

The transformer unit has a plurality of diodes D1-Dn and a plurality of capacitors C1-Cn by the turns ratio of the plurality of stacked secondary side windings N _2-1 to N _2-n and the primary side winding N ₁ . Through a), a plurality of DC voltages are output.

The output terminals V1 to Vn are drawn out for each high level port of the DC voltage output from each layer on the secondary side. The output unit outputs the voltages V ₁ to V _n sequentially stacked based on the low level of the last secondary winding N _2-n through the output terminal.

PWM control is performed by the output voltage controller 904 and the switching unit 902.

By comparing the output voltage control unit 904 outputs a negative voltage (V ₁ ~ V _n) based on the voltage (V ₁₎ is detected, and the detection result of the maximum voltage of the output signal to generate the control signal.

The switching unit 902 applies / blocks the input power V _IN to the primary side N ₁ of the transformer unit according to the control signal.

FIG. 9 is a simplified circuit diagram for describing a power supply apparatus of the plasma display panel according to the application example of FIG. 8. 9 is an address-and outputs the sustain discharge voltage (V _S) and the address voltage (V _a) of the plasma display panel driven by a driving signal of the display separation driving method.

FIG. 10 is a diagram for describing a preferred embodiment of the output voltage controller 904 of FIG. 8. The output voltage controller 904 illustrated in FIG. 10 includes voltage dividers R1 and R2, a comparator 910, and a reference signal generator 912 to generate a PWM control signal 906.

The voltage dividers R1 and R2 detect 914 the voltage V ₁ of the maximum voltage output terminal among the output voltages V ₁ to V _n by the distribution ratio of the resistors R 1 and R 2. The comparator 910 generates a control signal by comparing the detection result 914 with the level of the reference signal 916. The reference signal generator 912 generates a sawtooth wave as a PWM reference signal.

On the other hand, the plasma display panel of the present invention includes the power supply described above, and is driven by the plurality of output terminal voltages V1 to Vn of the power supply described above. The plasma display panel of the present invention may include the structure of FIG. 1, the driving device of FIG. 2, and the power supply device of FIG. 4. In particular, the power supply apparatus of the present invention described with reference to FIGS. 8 and 9 is a new structure for generating the output voltages V1 to Vn of the DC / DC converter 504 of FIG. Replaces the DC / DC converters 504-1 through 504-n.

The rectifier 500 includes a rectifier circuit such as a bridge diode to convert an input AC voltage into a rectified voltage V _REC .

The power factor correction unit 502 includes a power factor correction circuit including an inductor, a diode, a capacitor, and a switch to minimize waste of power consumption. In addition, the power factor correction unit 502 normally boosts the voltage and supplies it to the DC / DC converter 504. A typical internal circuit of the power factor correction unit 502 is illustrated in FIG.

The DC / DC converter 504 outputs a plurality of DC power supplies V1, V2, ..., Vn required by the system. Here, the plurality of DC output power sources V1, V2, .., Vn are the reset power sources Vs and Vset, the scan power sources V _SC-H and V _SC-L , the holding power source V _S , and the reset. The erase power Ve applied to the X electrode in the period PR, the bias power Vb applied to the X electrode in the address period PA, Vb = Ve in FIG. 3, the address power Va, and the like. .

Here, the DC / DC converter 504 is provided by FIG. 8.

The best embodiments have been disclosed in the drawings and specification above. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the present invention has the following effects.

In the conventional power supply unit structure, since each DC / DC converter is separately provided for each power output required in the plasma display panel, there are problems such as an increase in the number of components, an increase in cost, a complexity of the circuit, and an increase in the size of the circuit board.

The power supply of the present invention includes only one transformer and one output voltage control circuit having a primary side of a single winding and a secondary side in which multiple windings are stacked in series. Therefore, according to the present invention, a circuit simplification of the power supply device is realized, thereby reducing the manufacturing cost of the plasma display panel and reducing the circuit board size.

The invention is not limited to the examples described above and represented in the drawings. Those skilled in the art taught by the above-described embodiments, many modifications to the above-described embodiments are possible by substitution, erasure, merging, etc. within the scope and object of the present invention described in the following claims.

1 is a view showing the structure of a conventional three-electrode surface discharge plasma display panel.

FIG. 2 shows a typical driving apparatus of the plasma display panel shown in FIG. 1.

3 is a timing diagram illustrating an example of a driving signal of the panel illustrated in FIG. 1.

4 is a block diagram illustrating an example of a configuration of a power supply unit.

5 is an example of the power factor correction unit of FIG. 4.

FIG. 6 is a block diagram illustrating a conventional internal block diagram of the DC / DC converter of FIG. 4.

FIG. 7 is a circuit diagram illustrating a conventional DC / DC converter of FIG. 6.

8 is a simplified circuit diagram illustrating a power supply apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 9 is a simplified circuit diagram for describing a power supply apparatus of the plasma display panel according to the application example of FIG. 8.

FIG. 10 is a diagram for describing a preferred embodiment of the output voltage controller 904 of FIG. 8.

Claims (4)

In order to supply the necessary power from the plasma display panel, Input power; A transformer unit having a primary side of a single winding and a secondary side of a structure in which a plurality of windings are stacked in series, and outputting a DC voltage transformed by a winding ratio with the primary side for each layer of the secondary side; An output unit having an output terminal drawn out for each of the high level ports of the DC voltage output from the respective layers on the secondary side; An output voltage controller configured to detect a voltage at a maximum voltage output terminal among the output voltages, and generate a control signal by comparing the detected result with a reference signal; And And a switching unit configured to apply / block the input power to the primary side of the transformer unit in response to the control signal. The method of claim 1, wherein the output unit And a sustain discharge voltage and an address voltage of the plasma display panel driven by a drive signal of the address-display separation driving method. A rectifying unit converting the input AC power into a rectified voltage; A power factor correction unit for converting the rectified voltage into a power factor corrected voltage; A transformer unit having a primary side of a single winding and a secondary side of a structure in which a plurality of windings are stacked in series, and outputting a DC voltage transformed by a winding ratio with the primary side for each layer of the secondary side; An output unit having an output terminal drawn out for each of the high level ports of the DC voltage output from the respective layers on the secondary side; An output voltage controller configured to detect a voltage at a maximum voltage output terminal among the output voltages, and generate a control signal by comparing the detected result with a reference signal; And And a switching unit configured to apply / block the power factor corrected voltage to the primary side of the transformer unit according to the control signal. And a plasma display panel driven by the plurality of output terminal voltages. The method of claim 3, wherein the output unit A plasma display panel outputting a sustain discharge voltage and an address voltage of a plasma display panel driven by a drive signal of an address-display separation driving method.