KR100640054B1 - Energy recovery apparatus and method of plasma display panel - Google Patents

Abstract

The present invention relates to an energy recovery apparatus and a recovery method of a plasma display panel.

An energy recovery apparatus of a plasma display panel according to an exemplary embodiment of the present invention includes a capacitive load formed between first and second electrodes to which power is supplied, a capacitive load formed between the first and second electrodes, and the capacitive load and the first electrode. And a full bridge circuit including a second electrode and at least one switch element, and an auxiliary circuit including at least one switch element connected in parallel with the capacitive load between the first electrode and the second electrode. The full bridge circuit may include a first switch connected between the first electrode and the power supply, a third switch connected between the first electrode and ground, and a second switch connected between the second electrode and the ground. A second switch and a fourth switch connected between the second electrode and the power supply, wherein the auxiliary circuit includes a first diode and a first connection connected between the power supply and the first electrode; A sixth switch, a second diode and a fifth switch connected between the power supply and the second electrode, a connection point of the first diode and the sixth switch and a connection point of the second diode and the fifth switch It characterized in that it comprises an inductor.

Description

Energy recovery apparatus and recovery method of plasma display panel {ENERGY RECOVERY APPARATUS AND METHOD OF PLASMA DISPLAY PANEL}

1 is a perspective view showing a conventional three-electrode AC surface discharge type plasma display panel.

2 is a circuit diagram illustrating an energy recovery apparatus of a conventional plasma display panel.

3 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 2 and output waveforms of the panel capacitor.

4 is a diagram illustrating an energy recovery apparatus of a plasma display panel according to a first embodiment of the present invention.

FIG. 5 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 4 and output waveforms of the panel capacitor.

6 to 14 are diagrams illustrating respective energy flow charts formed from before the T0 period to the T7 period of FIG. 5.

FIG. 15 illustrates an energy recovery apparatus of a plasma display panel according to a second embodiment of the present invention.

FIG. 16 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 15 and an output waveform of the panel capacitor.

17 to 25 are diagrams illustrating respective energy flow charts formed from the T0 period to the T7 period in FIG. 16.

The present invention relates to an energy recovery apparatus and a recovery method of the plasma display panel, and more particularly, to an energy recovery apparatus and a recovery method of the plasma display panel to maximize the energy recovery efficiency and improve the discharge characteristics.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display panels (hereinafter referred to as "PDPs"), and electroluminescence ( Electro-Luminescence (EL) display.

PDP is a display device using a gas discharge has the advantage that it is easy to manufacture a large panel. As a PDP, a three-electrode AC surface discharge type PDP having three electrodes and driven by an alternating voltage is typical.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a first electrode 12Y and a second electrode 12Z formed on the upper substrate 10, and an address formed on the lower substrate 18. An electrode 20X is provided.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the first electrode 12Y and the second electrode 12Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the first electrode 12Y and the second electrode 12Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower plates and the partition wall.

The three-electrode AC surface discharge type PDP is driven by being divided into a plurality of subfields, and gray scale display is performed by emitting light a number of times proportional to the weight of video data in each subfield period. The subfield is driven again by being divided into an initialization period, an address period, a sustain period, and an erase period.

Here, the initialization period is a period during which uniform wall charges are formed in the discharge cells, and the address period is a period during which selective address discharge occurs according to the logic value of the video data, and the sustain period is a discharge in which the address discharge has occurred. It is a period in which discharge is maintained in the cell. The erasing period is a period of erasing the sustain discharge generated in the sustain period.

The address discharge and the sustain discharge of the AC surface discharge PDP driven in this way require a high voltage of several hundred volts or more. Therefore, an energy recovery apparatus is used to minimize the driving power required for the address discharge and the sustain discharge. The energy recovery apparatus recovers the voltage between the first electrode 12Y and the second electrode 12Z and uses the voltage recovered as the drive voltage at the next discharge.

Referring to FIG. 2, the energy recovery devices 30 and 32 of the PDP proposed by 'Weber (USP-5081400)' are symmetrically installed with the panel capacitor Cp interposed therebetween. Here, the panel capacitor Cp equivalently represents the capacitance formed between the first electrode Y and the second electrode Z. FIG. The first energy recovery device 30 supplies a sustain pulse to the first electrode (Y). The second energy recovery device 32 supplies a sustain pulse to the second electrode Z while operating alternately with the first energy recovery device 30.

The configuration of the energy recovery devices 30 and 32 of the conventional PDP will be described with reference to the first energy recovery device 30. The first energy recovery device 30 includes the inductor L connected between the panel capacitor Cp and the source capacitor Cs, and the first and the first connected in parallel between the source capacitor Cs and the inductor L. Three switches S1 and S3 and second and fourth switches S2 and S4 connected in parallel between the panel capacitor Cp and the inductor L are provided.

The second switch S2 is connected to the sustain voltage source VS, and the fourth switch S4 is connected to the ground voltage source GND. The source capacitor Cs recovers and charges the voltage charged to the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again. The source capacitor Cs is charged with a voltage of Vs / 2 corresponding to half of the sustain voltage source Vs. The inductor L forms a resonance circuit together with the panel capacitor Cp. The first to fourth switches S1 to S4 control the flow of current.

Meanwhile, the fifth and sixth diodes D5 and D6 provided between the first and second switches S1 and S2 and the inductor L respectively prevent current from flowing in the reverse direction.

3 is a timing diagram and waveform diagrams illustrating on / off timing of the first energy recovery device switches and an output waveform of the panel capacitor.

The operation process will be described in detail assuming that the panel capacitor Cp is charged with a voltage of 0 volts and the source capacitor Cs is charged with a voltage of Vs / 2 before the T1 period.

In the T1 period, the first switch S1 is turned on to form a current path from the source capacitor Cs to the first switch S1, the inductor L, and the panel capacitor Cp. When the current path is formed, the voltage of Vs / 2 charged in the source capacitor Cs is supplied to the panel capacitor Cp. At this time, since the inductor L and the panel capacitor Cp form a series resonant circuit, the panel capacitor Cp is charged with a Vs voltage that is twice the voltage of the source capacitor Cs.

In the T2 period, the second switch S2 is turned on. When the second switch S2 is turned on, the voltage of the sustain voltage source Vs is supplied to the first electrode Y. The voltage of the sustain voltage source Vs supplied to the first electrode Y prevents the voltage of the panel capacitor Cp from falling below the sustain voltage source Vs so that sustain discharge occurs normally. On the other hand, since the voltage of the panel capacitor Cp has risen to Vs in the period T1, the driving power supplied from the outside to cause the sustain discharge is minimized.

In the T3 period, the first switch S1 is turned off. At this time, the first electrode Y maintains the voltage of the sustain voltage source Vs for the period of T3. In the T4 period, the second switch S2 is turned off and the third switch S3 is turned on. When the third switch S3 is turned on, a current path is formed from the panel capacitor Cp to the source capacitor Cs through the inductor L and the third switch S3 to charge the panel capacitor Cp. The voltage is recovered to the source capacitor Cs. At this time, the source capacitor Cs is charged with a voltage of Vs / 2.

In the T5 period, the third switch S3 is turned off and the fourth switch S4 is turned on. When the fourth switch S4 is turned on, a current path is formed between the panel capacitor Cp and the base voltage source GND, so that the voltage of the panel capacitor Cp drops to zero volts. In the T6 period, the state of T5 is maintained for a certain time. In fact, the AC drive pulses supplied to the first electrode Y and the second electrode Z are obtained by periodically repeating the periods T1 to T6.

Meanwhile, the second energy recovery device 32 alternately operates with the first energy recovery device 30 to supply a driving voltage to the panel capacitor Cp. Accordingly, the sustain capacitor voltage Vs having opposite polarities are supplied to the panel capacitor Cp. As such, sustain pulse voltages Vs having opposite polarities are supplied to the panel capacitor Cp so that sustain discharge occurs in the discharge cells.

However, these conventional energy recovery devices 30 and 32 are the first energy recovery device 30 provided on the first electrode (Y) side and the second energy recovery device (32) provided on the second electrode (Z) side. Each operation requires a large number of circuit components (switching elements, etc.), thereby increasing the manufacturing cost. In addition, a large amount of power is consumed due to the conduction loss of a plurality of switches (diode, switch element, inductor) on the path of current. In addition, the conventional energy recovery devices 30 and 32 use series forced resonance when charging the panel capacitor Cp, and thus, the soft voltage does not completely switch due to the influence of parasitic elements in the circuit. Since it is not possible to control each, it is difficult to secure the discharge characteristics and the recovery efficiency to an appropriate level, and there is a problem that high temperature heat is generated during discharge.

Accordingly, an object of the present invention is to provide an energy recovery apparatus and a recovery method of a plasma display panel to maximize the energy recovery efficiency and improve the discharge characteristics.

In order to achieve the above object, the energy recovery device of the plasma display panel according to an embodiment of the present invention is the first and second electrodes, the capacitive load formed between the first and second electrodes, A full bridge circuit comprising a capacitive load and the first and second electrodes and at least one switch element, an inductor and at least one switch element connected in parallel with the capacitive load between the first and second electrodes And an auxiliary circuit including a first switch connected between the first electrode and the power source, a third switch connected between the first electrode and ground, and the second electrode; And a second switch connected between the ground and a fourth switch connected between the second electrode and the power source, wherein the auxiliary circuit includes the power supply and the first electrode. A first diode and a sixth switch connected to the second diode, a second diode and a fifth switch connected between the power supply and the second electrode, a connection point of the first diode and the sixth switch, the second diode and the And an inductor connected between the connection points of the fifth switch.

The auxiliary circuit may control the amount of energy stored in the inductor by using the switch elements.

The slope of the voltage charged and discharged to the capacitive load is characterized in that it changes in accordance with the amount of energy stored in the inductor.

The third and fourth switches are configured to supply a voltage from the power supply to the capacitive load, but form a current path to maintain a sustain voltage of a first polarity.

The third switch, the fourth switch, the fifth switch, and the sixth switch may form a current path for charging energy in the inductor while the capacitive load maintains a sustain voltage of a first polarity.

The first and second switches may supply a voltage from the power supply to the capacitive load, but form a current path to maintain a sustain voltage of a second polarity.

The first switch, the second switch, the fifth switch, and the sixth switch form a current path for charging energy to the inductor while the capacitive load maintains a sustain voltage of a second polarity.

The fifth and sixth switches may form a resonance circuit by connecting the inductor and the capacitive load.

The capacitive load is characterized by maintaining a constant voltage while the energy of the inductor changes.

The capacitive load is characterized by a change from the first voltage to the second voltage within a period shorter than the change in the energy of the inductor.

The capacitive load changes from a first voltage to a third voltage while the energy of the inductor is charged, and changes from a third voltage to a second voltage from a constant voltage while the energy of the inductor is discharged.

The capacitive load changes from a first voltage to a second voltage while energy is charged in the inductor, and maintains a second voltage while the energy of the inductor is discharged.

The fifth switch is turned on before the first and second switches are turned off.

The sixth switch may be turned on before the third and fourth switches are turned off.

The first and second switches may be turned on before the sixth switch is turned off.

The third and fourth switches may be turned off while the inductor is being charged.

The third and fourth switches may be turned on while the inductor is discharged.

The inductor includes first and second inductors connected in series, a seventh switch connected between the power supply and the first and second inductor connection points, and a connection between the first and second inductor connection points and ground. It further comprises a third diode to be.

The second and fourth switches may form current paths such that the voltage of the capacitive load maintains a constant voltage.

The second switch, the third switch, the sixth switch, and the seventh switch may form a current path for charging energy to the first inductor while the capacitive load maintains a constant voltage.

The second switch, the sixth switch, and the seventh switch may generate a counter electromotive force to the first inductor to supply the capacitive load, and form a current path to maintain a sustain voltage of a first polarity.

The second and third switches may be configured to form a current path to maintain the voltage of the capacitive load at a constant voltage.

The auxiliary circuit may control an amount of energy charged and discharged to the inductor by adjusting turn-on and turn-off timings of the fifth and sixth switch elements.

The voltage charged and discharged to the capacitive load is changed from a first voltage to a second voltage from a time point at which the third and fourth switches are turned off to a time point at which the first and second switches are turned on. The second voltage may be changed from the second voltage to the first voltage from the time when the first and second switches are turned off to the time when the third and fourth switches are turned on.

The voltage charged and discharged in the capacitive load changes from a first voltage to a second voltage after some energy is stored in the inductor, and maintains a second voltage before the discharge of the energy stored in the inductor is completed. do.

In an energy recovery method of a plasma display panel according to an embodiment of the present invention, in the energy recovery method of a plasma display panel having a first electrode and a second electrode for sustain discharge, a voltage from a sustain voltage source is supplied to the second electrode. A first step of maintaining the voltage of the panel at a negative sustain voltage; Storing energy from the sustain voltage source in an inductor while the voltage of the panel is maintained at a negative sustain voltage; Supplying energy stored in the inductor to the panel to charge the panel so that the voltage of the panel becomes a positive sustain voltage; Supplying a voltage from a sustain voltage source to the first electrode to maintain the voltage of the panel at a positive sustain voltage; A fifth step of storing energy from the sustain voltage source in the inductor while the voltage of the panel is maintained at the positive sustain voltage; And a sixth step of supplying energy stored in the inductor to the panel to charge the panel so that the voltage becomes a negative sustain voltage, wherein the first to sixth steps are repeated periodically.

The second step is characterized by including the first step.

The fifth step includes the fourth step.

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

4 is a diagram illustrating an energy recovery apparatus of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 4, an energy recovery apparatus of a plasma display panel (hereinafter, referred to as a “PDP”) according to a first embodiment of the present invention may include a first electrode Y and a second electrode Z of a PDP. ), A first switch, a second switch, and a third switch for maintaining the panel capacitor Cp represented by the capacitive load, that is, the equivalent capacitance, and the sustain voltage Vs of the panel capacitor Cp. And an inductor L and a fifth bridge connected to the full bridge circuit 10 including the fourth switches S1, S2, S3, and S4, and connected to the panel capacitor Cp to form a resonance circuit. The auxiliary circuit 20 which consists of 6th switches S5 and S6 is provided. Here, the first and second diodes D1 and D2 are connected to the auxiliary circuit 20 to clamp the voltage ringing of the fifth and sixth switches S5 and S6 connected to the panel capacitor Cp. .

The full bridge circuit 10 includes a first switch S1 connected between the sustain voltage source Vs and the first electrode Y, and a third switch connected between the first electrode Y and the ground terminal GND. (S3), the second switch S2 connected between the sustain voltage source Vs and the second electrode Z, and the fourth switch S4 connected between the second electrode Z and the ground terminal GND. ).

The auxiliary circuit 20 includes a first diode D1 and a sixth switch S6 connected between the sustain voltage source and the first electrode Y, and a second diode connected between the second voltage electrode Z and the sustain voltage source. D2) and the inductor L connected between the fifth switch S5 and the connection point of the first diode D1 and the sixth switch S6 and the connection point of the second diode D2 and the fifth switch S5. It is provided. Here, the first and second diodes D1 and D2 are connected in the direction of the sustain voltage source Vs at the panel capacitor Cp.

The energy recovery apparatus according to the first embodiment of the present invention having such a structure increases the current in the inductor L by conducting the auxiliary circuit 20 at a point before the voltage rise and fall of the panel capacitor Cp, thereby increasing the panel capacitor. Since the voltage charged in the Cp is inverted, the switching loss of the full bridge circuit 10 can be reduced.

5 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 4 and voltages applied to panel capacitors.

Referring to FIG. 5, an energy recovery apparatus and a recovery method of a PDP are described as follows.

Before the T0 period, the third switch and the fourth switch S3 and S4 remain turned on. Accordingly, as shown in FIG. 6, a current path including a sustain voltage source Vs, a fourth switch S4, a panel capacitor Cp, a third switch S3, and a ground terminal GND is formed to form a panel capacitor. The voltage of Cp is maintained at the negative sustain voltage (-Vs).

In the T0 period, the sixth switch S6 is turned on, and the third and fourth switches S4 maintain the turn-on state. As the sixth switch S6 is turned on, the inductor L is charged with a current component. Specifically, as shown in FIG. 7, while the sixth switch S6 is turned on, the fourth switch S4, the fifth switch S5, the inductor L, and the sixth switch S6. As the current path including the third switch S3 and the ground terminal GND is formed, the current component of the sustain voltage source Vs charges the inductor L. Meanwhile, as the current path including the sustain voltage source Vs, the fourth switch S4, the panel capacitor Cp, the third switch S3, and the ground terminal GND is maintained, the voltage of the panel capacitor Cp is maintained. Maintain a negative sustain voltage (-Vs).

In the T1 period, as shown in FIG. 8, the third switch and the fourth switch S3 and S4 are turned off. As the third switch and the fourth switch are turned off, the counter electromotive force is generated in the inductor L and the panel capacitor Cp is charged by the resonance of the inductor L and the panel capacitor Cp.

In the T2 period, as shown in FIG. 9, as the voltage of the panel capacitor Cp charged from the T1 period is charged to the sustain voltage Vs, voltages at both ends of each of the first switch S1 and the second switch S2 are increased. The zero voltage is formed, so that the first switch S1 and the second switch S2 are capable of zero voltage switching. Meanwhile, as the first and second switches S1 and S2 are turned on, the sustain voltage source Vs, the first switch S1, the panel capacitor Cp, the second switch S2, and the ground terminal A current path consisting of GND is formed so that the voltage from the sustain voltage source Vs is supplied to the panel capacitor Cp so that the voltage of the panel capacitor Cp is maintained at the sustain voltage Vs. Meanwhile, as the sixth switch S6 maintains the turn-on state, the current flowing in the inductor L linearly decreases.

In the T3 period, as shown in FIG. 10, the current of the inductor L, which has decreased from the T2 period, becomes zero. Accordingly, the sixth switch S6 is turned off and includes a current path including a sustain voltage source Vs, a first switch S1, a panel capacitor Cp, a second switch S2, and a ground terminal GND. Is formed so that the voltage of the panel capacitor Cp is maintained at the sustain voltage Vs.

In the T4 period, as illustrated in FIG. 11, the fifth switch S5 is turned on. As the fifth switch S5 is turned on, the sustain voltage source Vs, the first switch S1, the sixth switch S6, the inductor L, the fifth switch S5, and the second switch S2 are provided. ) And a ground path (GND) is formed so that the inductor (L) is charged with the current component of the sustain voltage source (Vs). At this time, the polarity of the current component to be charged has a polarity opposite to the current component to be charged in the T0 period. Meanwhile, the panel capacitor Cp is maintained as a current path including the sustain voltage source Vs, the first switch S1, the panel capacitor Cp, the second switch S2, and the ground terminal GND formed in the T3 period is maintained. Is maintained at the sustain voltage Vs.

In the period T5, as shown in FIG. 12, the first and second switches S1 and S2 are turned off. Accordingly, the counter electromotive force is generated in the inductor L, and a closed loop made of the sixth switch S6, the inductor L, the fifth switch S5, and the panel capacitor Cp is formed. Here, the inductor L and the panel capacitor Cp in the closed loop resonate, and the energy stored in the inductor L charges the panel capacitor Cp to the negative sustain voltage (-Vs).

In the T6 period, as shown in FIG. 13, the voltage of the panel capacitor Cp charged from the T5 period is charged to the negative sustain voltage (-Vs). Accordingly, zero voltage switching of the third and fourth switches S3 and S4 becomes possible as the voltages at both ends of the third and fourth switches S3 and S4 become zero voltages. Meanwhile, as the third and fourth switches S3 and S4 are turned on, the sustain voltage source Vs, the fourth switch S4, the panel capacitor Cp, the third switch S3, and the ground terminal GND Is formed to maintain the voltage of the panel capacitor Cp at the negative sustain voltage (-Vs). In addition, as the fifth switch S5 maintains the turn-on state, the current flowing in the inductor L linearly decreases.

In the T7 period, as shown in FIG. 14, as the current of the inductor L, which has decreased from the T6 period, becomes 0, the fifth switch S5 is turned off. The voltage of the panel capacitor Cp is formed by a current path including the sustain voltage source Vs, the fourth switch S4, the panel capacitor Cp, the third switch S3, and the ground terminal GND formed in the T6 period. Is maintained at the negative sustain voltage (-Vs).

The energy recovery apparatus according to the first exemplary embodiment of the present invention driven by the above method sufficiently stores the energy stored in the inductor L before the resonance time between the panel capacitor Cp and the inductor L, and then the panel capacitor. Supplying to Cp enables zero voltage switching of the main switches S1, S2, S3, and S4 connected to the panel capacitor Cp, thereby minimizing the loss due to switching.

Since the PDP energy recovery apparatus according to the first embodiment of the present invention uses parallel resonance, hard switching occurs without additional circuits when the first sustain pulse and the last sustain pulse are applied. Accordingly, the second embodiment of the present invention proposes a circuit for solving the above problems.

15 is a view showing an energy recovery apparatus of the PDP according to the second embodiment of the present invention.

Referring to FIG. 15, the energy recovery apparatus of the PDP according to the second embodiment of the present invention is a capacitive load formed between the first electrode Y and the second electrode Z of the PDP, that is, an equivalent capacitance. Display panel capacitor Cp and a first switch, a second switch, a third switch and a fourth switch S1, S2, S3, S4 for maintaining the sustain voltage Vs of the panel capacitor Cp. First and second inductors L1 and L2 and fifth to seventh switches S5, S6, and S7 connected to a full bridge circuit 60, the panel capacitor Cp to form a resonance circuit. An auxiliary circuit 70 is formed. Here, the first to third diodes D1, D2, and D3 which form a current path to clamp the voltage ringing of the fifth and sixth switches connected to the panel capacitor Cp are connected to the auxiliary circuit 70. do.

The full bridge circuit 60 includes a first switch S1 connected between the sustain voltage source Vs and the first electrode Y, and a third switch connected between the first electrode Y and the ground terminal GND. (S3), the second switch S2 connected between the sustain voltage source Vs and the second electrode Z, and the fourth switch S4 connected between the second electrode Z and the ground terminal GND. ).

The auxiliary circuit 70 may include a first diode D1 and a sixth switch S6 connected between the sustain voltage source and the first electrode Y, and a second diode connected between the second voltage Z and the sustain voltage source. D2) and fifth switches S5 and the first and the fifth connected between the connection point of the first diode D1 and the sixth switch S6 and the connection point of the second diode D2 and the fifth switch S5. The seventh switch S7 connected between the second inductors L1 and L2, the connection points of the first and second inductors L1 and L2, and the sustain voltage source Vs, and the first and second inductors L1 and L2. And a third diode D3 connected between the connection point of the C1 and the ground terminal GND. Here, the first to third diodes D1, D2, and D3 are connected in the direction of the sustain voltage source Vs at the panel capacitor Cp.

The energy recovery apparatus according to the second embodiment of the present invention having such a structure is identical except for the method of driving the first sustain pulse and the last sustain pulse in the driving method of the energy recovery apparatus according to the first embodiment of the present invention. Since it is described by the method, a description thereof will be omitted. When the sustain pulses other than the first sustain pulse and the last sustain pulse are generated using the energy recovery apparatus according to the second embodiment of the present invention, the first and second energy recovery apparatuses may be compared with those of the energy recovery apparatus according to the first embodiment of the present invention. The second inductors L1 and L2 are inductors L and the seventh switch S7 maintains a turn-off state to generate sustain pulses other than the first sustain pulse and the last sustain pulse.

Accordingly, the first sustain pulse and the last sustain pulse generation of the energy recovery apparatus according to the second embodiment of the present invention will be described with reference to FIG. 16.

FIG. 16 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 15 and voltages applied to a panel capacitor.

An energy recovery apparatus and a recovery method of a PDP according to a second embodiment of the present invention will be described with reference to FIG. 16. Here, referring to the case where the voltage stored in the panel capacitor Cp rises from 0 to Vs, referring to the period T0 to the period T3 shown in FIG. 16, first, the second switch S2 is continuously turned on. The on state is maintained, and the fourth switch S4 is continuously turned off.

Before the T0 period, the second switch and the third switch S2 and S3 are turned on as shown in FIG. 17. As the second and third switches S2 and S3 are turned on, a current path including the second switch S2, the panel capacitor Cp, the third switch S3, and the ground terminal GND is formed. Thus, the voltage of the panel capacitor Cp is maintained at zero voltage.

In the T0 period, as shown in FIG. 18, the sixth and seventh switches S6 and S7 are turned on, and the second switch S2 remains turned on. As a result, a current path consisting of the sustain voltage source Vs, the seventh switch S7, the first inductor L1, the sixth switch S6, the third switch S3, and the ground terminal is formed to form a first inductor ( L1) is charged with the current component of the sustain voltage source Vs. Here, the voltage of the panel capacitor Cp maintains zero voltage.

In the T1 period, as shown in FIG. 19, the third switch S8 is turned off. Accordingly, the counter electromotive force is generated in the first inductor L1 to reverse the polarity of the charge amount stored in the first inductor L1, and the first inductor is formed by a resonance circuit composed of the first inductor L1 and the panel capacitor Cp. Energy stored in L1 charges the panel capacitor Cp.

In the T2 period, as shown in FIG. 20, the first switch S1 is turned on, and the sixth and seventh switches S6 and S7 are turned off. In this T2 period, the voltage of the panel capacitor Cp, which started to charge from the T1 period, is completed to become the sustain voltage Vs. As a result, the voltages at both ends of the first switch S1 and the second switch S2 become zero voltages, thereby enabling zero voltage switching of the first switch S1 and the second switch S2. Meanwhile, as the first switch S1 and the second switch S2 are turned on, the sustain voltage source Vs, the first switch S1, the panel capacitor Cp, the second switch S2, and the ground terminal A current path consisting of GND is formed so that the voltage of the sustain voltage source Vs is supplied to the panel capacitor Cp. In addition, as the seventh switch S7 is turned off, the current flowing in the first inductor L1 is a current path formed by the first diode D1, the first inductor L1, and the ground terminal GND. Therefore, it discharges linearly.

In the T3 period, as shown in FIG. 21, as the first switch S1 is turned on, the voltage of the panel capacitor Cp is maintained at the sustain voltage Vs. On the other hand, the current flowing in the first inductor L1 discharged from the period T2 becomes zero. In this manner, the energy recovery apparatus according to the second embodiment of the present invention transitions the voltage stored in the panel capacitor Cp from 0 to Vs.

Next, a process of transitioning the voltage stored in the panel capacitor Cp from the voltage Vs to the voltage 0 will be described with reference to the period T4 to the period T7 with reference to FIG. 16.

In the T4 period, as shown in FIG. 22, the fifth switch S5 is turned on and the first switch S1 remains turned on. Accordingly, the sustain voltage source Vs, the first switch S1, the sixth switch S6, the first and second inductors L1 and L2, the fifth switch S5, the second switch S2, and the ground A current path formed of the terminal GND is formed to charge current components in the first and second inductors L1 and L2 by the sustain voltage source Vs. Meanwhile, the current of the sustain voltage source Vs, the first switch S1, the panel capacitor Cp, the second switch S2, and the ground terminal GND is maintained so that the voltage of the panel capacitor Cp is sustained. Is maintained at (Vs).

In the period T5, as illustrated in FIG. 23, the first switch S1 is turned off. Accordingly, the counter electromotive force is generated in the first and second inductors L1 and L2, and a resonance circuit including the first inductor, the second inductors L1 and L2, and the panel capacitor Cp is formed to form the panel capacitor Cp. The energy charged in the battery is discharged quickly.

In the period T6, as shown in FIG. 24, the discharge of the panel capacitor Cp from the period T5 is completed so that the voltage of the panel capacitor Cp becomes zero voltage. Here, as the fifth switch S5 is turned off, the ground terminal GND, the third switch S3, the sixth switch S6, the first inductor L1, the second inductor L2 and the second The current path formed by the diode D2 is formed so that the current flowing through the first and second inductors L1 and L2 is discharged. Meanwhile, as the voltage of the panel capacitor Cp is maintained at zero voltage, the voltage between both ends of the third switch S3 becomes zero voltage, and thus the zero voltage switching of the third switch S3 is possible. Meanwhile, as the third switch S3 is turned on, a current path including the third switch S3, the panel capacitor Cp, the second switch S2, and the ground terminal GND is formed, thereby forming the panel capacitor. The voltage at Cp is maintained at zero voltage.

In the T7 period, as shown in FIG. 25, as the fifth switch S5 maintains the turn-off state, currents flowing through the first and second inductors L1 and L2 discharged from the T6 period become zero.

As described above, the energy recovery apparatus according to the second embodiment of the present invention grounds the second electrode Z and uses the first electrode Y, that is, the voltage stored in the panel capacitor Cp is 0 to Vs. As a result, the voltage transitions from the voltage Vs to the voltage zero. In addition, the energy recovery apparatus according to the second embodiment of the present invention grounds the first electrode (Y) and using the second electrode (Z), that is, the method of forming the negative sustain voltage (-Vs) is described above T1 In steps T3 and T4 to T7, the first switch S1 is replaced with the fourth switch S4, the third switch S3 is replaced with the second switch S2, and the fifth and sixth This can be done by supplying the timings of the switches S5 and S6 in opposition. Accordingly, when generating the negative sustain voltage (−Vs), the third switch S3 continuously maintains the turn-on state, and the first switch S1 continuously maintains the turn-off state.

The energy recovery device according to the second embodiment of the present invention having such a structure has the same effect as the energy recovery device according to the first embodiment of the present invention, while soft switching for generating the first sustain pulse and the last sustain pulse. This can improve the problem of parallel resonance by reducing the switching loss when switching the main circuit connected to the panel capacitor (Cp).

Meanwhile, in the method of forming the negative sustain voltage (-Vs) by using the energy recovery device according to the second embodiment of the present invention, the first switch S1 is replaced by the fourth switch S4 in the aforementioned T1 to T7 processes. The present invention can be implemented by replacing the third switch S3 with the second switch S2 and supplying the timings of the fifth and sixth switches S5 and S6 in opposition. Accordingly, when generating the negative sustain voltage (-Vs), the third switch S3 continuously maintains the turn-on state, and the first switch S1 continuously maintains the turn-off state.

As described above, the energy recovery device and recovery method of the plasma display panel according to the embodiment of the present invention increases the energy recovery efficiency by increasing the current in the inductor before the rising and falling time of the sustain waveform of the panel capacitor, By inverting the panel voltage, the switching losses of the switch directly connected to the panel capacitor can be reduced, and switching losses can be greatly reduced by converting hard switching to soft switching for the first and last sustain pulses generated in parallel resonance. do.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (27)

First and second electrodes to which power is supplied; A capacitive load formed between the first and second electrodes, A full bridge circuit comprising the capacitive load and the first and second electrodes and at least one switch element; An auxiliary circuit comprising an inductor and at least one switch element connected in parallel with the capacitive load between the first electrode and the second electrode, The full bridge circuit includes a first switch connected between the first electrode and the power supply, a third switch connected between the first electrode and ground, and a second switch connected between the second electrode and the ground. And a fourth switch connected between the second electrode and the power source, The auxiliary circuit includes a first diode and a sixth switch connected between the power supply and the first electrode, a second diode and a fifth switch connected between the power supply and the second electrode, the first diode and the An inductor connected between a connection point of a sixth switch and a connection point of the second diode and the fifth switch, And the fifth switch is turned on before the first and second switches are turned off. The method of claim 1, The auxiliary circuit And an amount of energy stored in the inductor by using the switch elements. The method of claim 2, And an inclination of the voltage charged and discharged to the capacitive load changes in correspondence to the amount of energy stored in the inductor. The method of claim 1, The third and fourth switches Supplying a voltage from the power supply to the capacitive load, wherein a current path is formed to maintain a sustain voltage of a first polarity. The method of claim 1, The third switch, the fourth switch, the fifth switch, and the sixth switch While the capacitive load maintains a sustain voltage of the first polarity And a current path for charging energy in the inductor. The method of claim 1, The first and second switches Supplying a voltage from the power supply to the capacitive load, wherein a current path is formed to maintain a sustain voltage of a second polarity. The method of claim 1, The first switch, the second switch, the fifth switch and the sixth switch While the capacitive load maintains a sustain voltage of the second polarity And a current path for charging energy in the inductor. The method of claim 1, The fifth and sixth switches And a resonant circuit is formed by connecting the inductor and the capacitive load. The method of claim 1, The capacitive load And a constant voltage while the energy of the inductor changes. The method of claim 1, The capacitive load And recovering the energy of the inductor from the first voltage to the second voltage within a shorter time period than the change of the energy of the inductor. The method of claim 10, The capacitive load The energy recovery device of the plasma display panel of claim 1, wherein the energy of the inductor is changed from the first voltage to the third voltage while the energy of the inductor is changed from the third voltage to the second voltage while the energy of the inductor is discharged. The method of claim 10, The capacitive load The energy recovery device of the plasma display panel, characterized in that the change from the first voltage to the second voltage while the inductor is charged with energy, and maintains the second voltage while the energy of the inductor is discharged. delete The method of claim 1, The sixth switch is And the third and fourth switches are turned on before being turned off. The method of claim 1, The first and second switches And the sixth switch is turned on before the sixth switch is turned off. The method of claim 1, The third and fourth switches And the energy recovery device of the plasma display panel is turned off while the inductor is being charged. The method of claim 1, The third and fourth switches The energy recovery device of the plasma display panel, characterized in that the inductor is turned on during the discharge. The method of claim 1, The inductor has first and second inductors connected in parallel, A seventh switch connected between the power supply and the first and second inductor connection points, And a third diode connected between the first and second inductor connection points and a ground. The method of claim 18, The second and third switches are And a current path is formed such that the voltage of the capacitive load maintains a constant voltage. The method of claim 18, The second switch, the third switch, the sixth switch, and the seventh switch And a current path for charging energy in the first inductor while the capacitive load maintains a constant voltage. The method of claim 18, The second switch, the sixth switch, and the seventh switch Generating a back electromotive force in the first inductor to supply the capacitive load, and forming a current path to maintain a sustain voltage of a first polarity. The method of claim 1, The auxiliary circuit And controlling the amount of energy charged and discharged to the inductor by adjusting turn-on and turn-off timings of the fifth and sixth switch elements. The method of claim 1, The voltage charged and discharged to the capacitive load is From a time point at which the third and fourth switches are turned off to a time point at which the first and second switches are turned on, a first voltage is changed from a first voltage to a second voltage, and the first and second switches are turned off. And from the time point at which the third and fourth switches are turned on, from the second voltage to the first voltage. The method of claim 1, The voltage charged and discharged to the capacitive load is And after the energy is partially stored in the inductor, the energy is changed from the first voltage to the second voltage and the second voltage is maintained before the discharge of the energy stored in the inductor is completed. In the energy recovery method of the plasma display panel having a first electrode and a second electrode for sustain discharge, A first step of supplying a voltage from a sustain voltage source to the second electrode to maintain the voltage of the panel at a negative sustain voltage; Storing energy from the sustain voltage source in the inductor while the voltage of the panel is maintained at the negative sustain voltage; Supplying energy stored in the inductor to the panel to charge the panel so that the voltage of the panel becomes a positive sustain voltage; Supplying a voltage from a sustain voltage source to the first electrode to maintain the voltage of the panel at a positive sustain voltage; A fifth step of storing energy from the sustain voltage source in the inductor while the voltage of the panel is maintained at the positive sustain voltage; And a sixth step of supplying energy stored in the inductor to the panel to charge the panel so that the voltage of the panel becomes a negative sustain voltage, wherein the first to sixth steps are repeated periodically. Energy recovery method. delete delete

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