KR20070029029A - Device for driving of plasma display panel - Google Patents

Abstract

An apparatus for driving a plasma display panel is provided to increase energy recovery efficiency by minimizing leakage power by performing energy supply and recovery processes with different voltages. An apparatus for driving a plasma display panel(PDP) includes an energy recovery circuit, which supplies and recovers stored energy to and from the PDP. The apparatus includes an energy supply controller(110), a first reference voltage supply unit(120), an energy recovery controller(130), a second reference voltage supply unit(140), and an energy storage unit(150). The energy storage unit includes plural capacitors, which perform energy supply and recovery processes with different voltages. The capacitors are series-connected to each other between first and second reference voltages, where the first reference voltage is a sustain voltage and the second reference voltage is a ground voltage. An energy supply path, which is different from an energy recovery path, is formed between the second and third capacitors.

Description

Plasma Display Panel Driving Device {Device for Driving of Plasma Display Panel}

1 is a circuit diagram showing a conventional energy recovery circuit.

2 is a waveform diagram showing driving waveforms and current characteristics of a conventional energy recovery circuit;

3 is a waveform diagram showing actual driving waveforms of a conventional energy recovery circuit;

4 is a circuit diagram showing a first embodiment of an energy recovery circuit of the plasma display panel driving apparatus according to the present invention;

5 and 6 are waveform diagrams showing driving waveforms of the energy recovery circuit according to the present invention;

7 is a circuit diagram showing a second embodiment of the energy recovery circuit of the plasma display panel driving apparatus according to the present invention;

FIG. 8 is a waveform diagram showing actual driving waveforms of the energy recovery circuit of FIG. 7; FIG.

9 is a circuit diagram showing a third embodiment of the energy recovery circuit of the plasma display panel driving apparatus according to the present invention;

<Description of Symbols for Main Parts of Drawings>

110, 210, 310: energy supply control unit

120, 220, 320: first reference voltage supply unit

130, 230, 330: energy recovery control

140, 240, 340: second reference voltage supply unit

150, 250, 350: energy storage

Cp: Panel

S1 ~ S4: Switch

D1, D2: Diode

L, L1, L2: Inductors

Cs1, Cs2, Cs3: Capacitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel driving apparatus for reducing energy consumption and increasing energy recovery efficiency.

A typical plasma display panel driver includes a sustain driver circuit for applying a sustain pulse to the Y electrode and the Z electrode alternately to maintain the discharge of the selected cell. Such a sustain driving circuit is included in the Y electrode driving unit and the Z electrode driving unit, respectively, and an energy recovery circuit is currently used as the sustain driving circuit of the plasma display panel.

The energy recovery circuit described above recovers energy supplied to the plasma display panel and supplies the energy back to the plasma display panel to increase energy use efficiency.

1 is a circuit diagram showing a conventional energy recovery circuit, Figure 2 is a graph showing the drive waveform and current characteristics of the conventional energy recovery circuit.

As shown in the drawing, the conventional energy recovery circuit includes first to fourth switches S1, S2, S3, and S4 connected to the panel Cp, a capacitor Css, and an inductor L. The operation state consists of four steps described below.

First, in the first state (state 1), only the first switch S1 is turned on, and the second to fourth switches S2, S3, and S4 are turned off. As a result, the Vp voltage gradually increases as energy stored in the capacitor Css is supplied to the panel Cp. In the first state, as shown in FIG. 2, the current flowing through the inductor _L is + I _L since energy is supplied from the capacitor Css to the panel Cp.

Next, in the second state (state 2), the first switch S1 and the second switch S2 are turned on together, and the third switch S1 and the fourth switch S4 are turned off. Accordingly, Vp becomes the first reference voltage supplied from the second switch S2, that is, the sustain voltage Vcc.

More specifically, the sustain voltage Vcc is applied to the panel Cp at the time when the first state 1 ends, that is, at the point t1 where Vp becomes the maximum value Vcc by LC resonance.

Thereafter, in the third state (state 3), only the third switch S3 is turned on, and the first switch S1, the second switch S2, and the fourth switch S4 are turned off. As a result, the energy stored in the panel Cp is discharged and recovered by the capacitor Css, and the Vp voltage gradually decreases. In the third state, as the current flows from the panel Cp toward the capacitor Css, as shown in FIG. 2, the current flowing in the inductor L becomes the reverse direction, that is, -I _L.

Finally, in the fourth state (state 4), the third switch S3 and the fourth switch S4 are turned on together, and the first switch S1 and the second switch S2 are turned off. As a result, Vp becomes a ground level voltage.

More specifically, the voltage Vp supplied to the panel Cp is maintained at the ground level at the moment when the third state 3 ends, that is, the fourth state 4 starts from the time t2.

The conventional energy recovery circuit as described above includes only one inductor L for energy recovery and supply. Since energy is supplied to the panel through one inductor L and energy is recovered from the panel, the current paths for supplying and recovering energy are the same, but only the direction of the current is reversed.

In addition, the voltage reference for supplying and recovering energy to the panel using the inductor L is driven by the charging of Css, and always maintains the voltage of Css = Vcc / 2 in actual driving. The reason is that in the ideal operation, the energy recovery and supply are made through the same inductor (L), so that the balanced operation maintains the voltage of Css between Vcc and ground level.

In an ideal operation, the er_up voltage should rise from 0V to Vcc and the er_dn voltage should fall from Vcc to 0V with the voltage Vss of Vss near Vcc / 2. In this case you will get 100% efficiency, but in practice it is not.

3 is a waveform diagram showing actual driving waveforms of a conventional energy recovery circuit.

As shown, the voltage due to Er_up does not rise to Vcc and the remaining insufficient voltage Vd is filled by S3 during the sus_up process, and er_dn is also filled with Vd 'by S4. At this time, Vss uses a common voltage without distinguishing between energy supply and recovery operations.

However, in the conventional energy recovery circuit as described above, leakage power consumption and power loss due to the difference in the Vd voltage are generated in the mounted driving circuit and circuit components, and energy recovery efficiency is also achieved by using the same voltage during the energy supply and recovery operation. There was a problem of this deterioration.

Accordingly, the present invention is to solve the above problems, by using a plurality of capacitors to perform the energy supply and recovery operation at different voltages to minimize the leakage power consumption, driving the plasma display panel to increase the energy recovery efficiency The object is to provide a device.

The present invention for achieving the above object is a plasma display panel drive device comprising an energy recovery circuit for supplying and recovering the energy stored in the energy storage unit to the panel, the energy recovery circuit resonates the energy stored in the energy storage unit It includes an inductor unit for supplying and recovering to the panel through, the energy storage unit is configured to connect a plurality of capacitors, and to perform the energy supply and recovery operation at different voltages.

In addition, the plurality of capacitors may be connected in series between the first reference voltage and the second reference voltage.

The energy storage unit may be configured to connect first to third capacitors in series, and configure an energy recovery path between the first capacitor and the second capacitor, and different from the energy recovery path between the second capacitor and the third capacitor. An energy supply path is configured and connected to each of the inductor units.

The inductor unit may include a first inductor and a second inductor, the first inductor may be disposed on the energy recovery path, and the second inductor may be disposed on the energy supply path.

The first inductor may be connected in common with the first capacitor and the second capacitor, and the second inductor may be commonly connected with the second capacitor and the third capacitor.

The inductor unit may include a first inductor and a second inductor, wherein the first inductor is disposed on the energy recovery path, and the second inductor is commonly disposed on the energy recovery path and the energy supply path. It features.

The first inductor may be connected in common with the first capacitor and the second capacitor, and the second inductor and the first inductor may be connected in series between the first capacitor and the second capacitor and between the panel. It is characterized in that the arrangement.

In addition, the plurality of capacitors are characterized in that they have the same voltage to each other.

In addition, the plurality of capacitors are characterized by having different voltages.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

4 is a circuit diagram illustrating a first embodiment of an energy recovery circuit of the plasma display panel driving apparatus according to the present invention, and FIGS. 5 and 6 are waveform diagrams showing driving waveforms of the energy recovery circuit according to the present invention.

As shown, the present invention is the plasma display panel driving apparatus including an energy recovery circuit for supplying and recovering energy stored in the energy storage unit 150 to the panel (Cp), the energy supply control unit 110, the first An inductor unit for supplying and recovering energy stored in the reference voltage supply unit 120, the energy recovery control unit 130, the second reference voltage supply unit 140, the energy storage unit 150, and the energy storage unit 150 to the panel. (L).

The energy storage unit 150 connects the plurality of capacitors Cs1 to Cs3, and performs energy supply and recovery with different voltages Vs1 and Vs2 from the capacitors Cs1 to Cs3.

In particular, the plurality of capacitors Cs1 to Cs3 are connected in series between a first reference voltage and a second reference voltage. The first reference voltage is a sustain voltage Vcc, and the second reference voltage is a ground voltage GND.

In addition, the energy storage unit 150 is configured to connect the first to third capacitors Cs1 to Cs3 in series, and configure an energy recovery path between the first capacitor Cs1 and the second capacitor Cs2. In addition, an energy supply path different from the energy recovery path is formed between the second capacitor Cs2 and the third capacitor Cs3 and connected to the inductor L, respectively.

The operation of the energy recovery circuit according to the first embodiment of the present invention configured as described above will be described in more detail as follows.

First, in the first state, only the first switch S1 of the energy supply control unit 110 is turned on, and the other second to fourth switches S2, S3, and S4 are all turned off. Therefore, the voltage Vs2 between the capacitors Cs2 and Cs3 of the energy storage unit 150 is supplied to the panel Cp via the inductor portion L.

In the second state, the first switch S1 and the second switch S2 are turned on together, and the third switch S1 and the fourth switch S4 are turned off. Accordingly, the sustain voltage Vcc supplied from the second switch S2 is maintained in the panel Cp for a predetermined time.

Thereafter, in the third state, the third switch S3 is turned on and the remaining switches S1, S2, and S4 are turned off. Therefore, the energy stored in the panel Cp is recovered to the capacitors Cs1 and Cs2 of the energy storage unit 150 via the inductor L.

In the fourth state, only the fourth switch S4 is turned on and the remaining switches S1, S2, and S3 are turned off. Therefore, the voltage Vp applied to the panel Cp becomes the ground voltage.

Therefore, as shown in the drawing, the driving circuit according to the present invention comprises a plurality of capacitors Cs1 to Cs3 for energy recovery between Vcc and ground, and the voltages Vs1 and Vs2 of the capacitor connection nodes Cs1 to Cs3. Can be obtained as er voltage. In this case, the plurality of capacitors Cs1 to Cs3 preferably have the same voltage or have different voltages.

For example, when the capacitors Cs1 to Cs3 have the same voltage, when Vcc = 180V and Cs1 = Cs2 = Cs3, Vs1 = 60V and Vs2 = 120V can be obtained. Therefore, 120V in the energy supply er_up operation and 60V er voltage in the energy recovery er_dn operation can be applied.

5 shows a driving waveform of the energy recovery circuit according to the present invention. In the energy supply Er_up operation, the voltage Vs2 is connected to one side of the inductor L by the first switch S1 on, and the voltage Vs1 is turned on by the second switch S2 on in the energy recovery process er_dn. Connected to one side of L).

Under the condition "Cs1 = Cs2 = Cs3", the energy supply (er_up) resonates around the "Vcc × 2/3" voltage higher than Vcc / 2 voltage because the voltages Vs1 and Vs2 are divided by 1/3 of Vcc. The recovery voltage (er_dn) reaches Vcc sufficiently, and er-dn also resonates around the Vcc / 3 voltage lower than the Vcc / 2 voltage, thus reaching the ground level sufficiently to maximize energy recovery efficiency. You can.

On the other hand, it is possible to adjust Vs1 and Vs2 to any desired voltage by varying the capacitor values. For example, as illustrated in FIG. 6, when the plurality of capacitors Cs1 to Cs3 have different voltages, "i = = Cs3 = 10kV, Cs2 = 20kV and Vcc = 200V", Due to the relationship of C x dV / dt ", both ends of Cs2 become half of the voltages of Cs1 and Cs3.

That is, "Vs1 = 80V, Vs2 = 120V" can reduce or widen the difference between Vs1 and Vs2, and in this way, Cs1, Cs2, and Cs3 can be set differently to make arbitrary Vs1 and Vs2 voltages. Of course, it is also possible to obtain a more improved energy recovery effect by placing a variety of capacitors of the same capacity in series.

FIG. 7 is a circuit diagram illustrating a second embodiment of an energy recovery circuit of the plasma display panel driving apparatus according to the present invention, and FIG. 8 is a waveform diagram showing actual driving waveforms of the energy recovery circuit according to FIG. 7.

As shown, the present invention, in the plasma display panel driving apparatus including an energy recovery circuit for supplying and recovering the energy stored in the energy storage unit 250 to the panel (Cp), the energy supply control unit 210, the first Each of the reference voltage supply unit 220, the energy recovery control unit 230, the second reference voltage supply unit 240, the energy storage unit 250 and the energy stored in the energy storage unit 250 to supply and recover the energy stored in the panel First and second inductors L1 and L2 are included.

The energy storage unit 250 is; A plurality of capacitors Cs1 to Cs3 are connected to each other, and energy supply and recovery operations are performed at different voltages Vs1 and Vs2 from the capacitors Cs1 to Cs3, in particular, the plurality of capacitors Cs1 to Cs3. Is connected in series between the first reference voltage and the second reference voltage, that is, the sustain voltage Vcc and the ground voltage GND.

In addition, the energy storage unit 250 configures an energy recovery path between the first capacitor Cs1 and the second capacitor Cs2 via the first inductor L1, and the second capacitor Cs2 and the second capacitor Cs2. An energy supply path is formed between the third capacitors Cs3 via the second inductor L2.

Accordingly, the first inductor L1 recovers the energy supplied to the panel Cp to the energy storage 250, and the second inductor L2 recovers the energy stored in the energy storage 250. Supplies).

Therefore, according to the second embodiment of the present invention, the inductors L1 and L2 for energy recovery / supply operation are independently designed to Vs1 and Vs2, respectively, so that separate resonances are performed according to energy supply (er_up) and energy recovery (er_dn) operations. Has characteristics. Therefore, if the inductor is L2 < L1, an output waveform can be obtained in a tr < tf relationship as shown in FIG.

That is, the energy supply (er_up) and sus_up operations are accelerated for discharge, and the energy recovery (er_dn) and sus_dn operations are slower in order to increase recovery efficiency. Of course, by setting L1 = L2 to drive, the same operating performance as in the first embodiment can be obtained.

In the drawings, diodes D3 and D4 are clamping diodes for preventing the output voltage from exceeding Vcc or below ground level.

On the other hand, if the inductors (L1, L2) are arranged separately there is an advantage that can reduce the amount of heat than conventional.

9 is a circuit diagram showing a third embodiment of the energy recovery circuit of the plasma display panel driving apparatus according to the present invention.

As shown, the present invention is the plasma display panel driving apparatus including an energy recovery circuit for supplying and recovering energy stored in the energy storage unit 350 to the panel (Cp), the energy supply control unit 310, the first Each of the reference voltage supplying unit 320, the energy recovery control unit 330, the second reference voltage supplying unit 340, the energy storage unit 350, and the energy stored in the energy storage unit 350 are supplied to and recovered from the panel. First and second inductors L1 and L2 are included.

The energy storage unit 350 connects and configures a plurality of capacitors Cs1 to Cs3, and performs energy supply and recovery operations at different voltages Vs1 and Vs2 from each capacitor Cs1 to Cs3, in particular, The plurality of capacitors Cs1 to Cs3 are connected in series between the first reference voltage and the second reference voltage, that is, the sustain voltage Vcc and the ground voltage GND.

Accordingly, the plurality of capacitors Cs1 to Cs3 preferably have the same voltage or different voltages.

The second inductor L2 supplies and recovers energy stored in the energy storage unit 350 to the panel Cp, and the first inductor L1 is connected to one end of the second inductor L2 in series. The energy supplied to the panel Cp is recovered to the energy storage 350 through a path different from the energy supply path.

Therefore, according to the third embodiment of the present invention, by placing the inductor L2 on the output side, only L2 passes through the path in the energy supply er_up operation but passes through the inductor L2 + L1 path in the energy recovery er_dn operation. Therefore, at this time, an operation characteristic similar to that of the second embodiment shown in FIG. 7 may be obtained. In this case, even when L1 = L2, the inductor of the energy recovery (er_dn) can obtain twice the energy supply (er_up) process. Of course, the inductor is L2 <L1 depending on the driving conditions. I can drive it.

According to the present invention, since the er capacitor voltage can be applied differently during the energy recovery and supply by the design arrangement of the capacitor, not only can the driving efficiency be optimized, but also the inductor can be independently placed in each operation to maximize the energy recovery efficiency. Can be.

In the above has been shown and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment without departing from the gist of the invention claimed in the claims, the common knowledge in the field to which the present invention belongs. Anyone having a variety of modifications can be carried out, and it is preferable that such a modified or modified embodiment should be interpreted as being included in the scope of the present invention.

As described above, according to the apparatus for driving a plasma display panel according to the present invention, by using a plurality of capacitors to perform energy supply and recovery operations at different voltages, leakage power consumption can be minimized and energy recovery efficiency can be increased. . In addition, the separate arrangement of the inductor also has the advantage that can reduce the heat generation than conventional. In addition, because the capacitor voltage can be applied differently during energy recovery and supply by the design arrangement of the capacitor, not only can the driving efficiency be optimized, but also the inductor can be placed independently in each operation to maximize the energy recovery efficiency. It works.

Claims (9)

An apparatus for driving a plasma display panel comprising an energy recovery circuit for supplying and recovering energy stored in an energy storage unit to a panel. The energy recovery circuit; An inductor unit for supplying and recovering energy stored in the energy storage unit to the panel through resonance; The energy storage unit; And a plurality of capacitors connected to each other to perform energy supply and recovery operations at different voltages. The method of claim 1, And the plurality of capacitors are connected in series between a first reference voltage and a second reference voltage. The method of claim 1, The energy storage unit; First to third capacitors are connected in series, and an energy recovery path is formed between the first capacitor and the second capacitor, and an energy supply path different from the energy recovery path is different between the second capacitor and the third capacitor. And a plasma display panel driving device connected to the inductor unit, respectively. The method of claim 3, wherein The inductor unit A first inductor and a second inductor, And the first inductor is disposed on the energy recovery path, and the second inductor is disposed on the energy supply path. The method of claim 4, wherein The first inductor is commonly connected with the first capacitor and the second capacitor, And the second inductor is connected in common with the second capacitor and the third capacitor. The method of claim 3, wherein The inductor unit A first inductor and a second inductor, And the first inductor is disposed on the energy recovery path, and the second inductor is commonly disposed on the energy recovery path and the energy supply path. The method of claim 6, The first inductor is commonly connected with the first capacitor and the second capacitor, And the second inductor and the first inductor are disposed in series between the first capacitor and the second capacitor and between the panel. The method according to claim 1 or 2, And the plurality of capacitors have the same voltage. The method according to claim 1 or 2, And the plurality of capacitors have different voltages.

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