KR100563461B1 - Apparatus of Energy Recovery and Energy Recovering Method Using the same - Google Patents

Abstract

The present invention relates to an energy recovery apparatus and method for reducing the manufacturing cost.

An energy recovery apparatus according to the present invention includes a capacitive load that is equivalently formed between a scan electrode and a sustain electrode; A voltage charging unit for resupplying the sustain voltage recovered from the capacitive load to the capacitive load to charge the capacitive load; A voltage holding unit connected to the capacitive load to supply the sustain voltage so that stable discharge can be generated at the capacitive load charged with the sustain voltage; A voltage relay unit connected between the voltage charging unit and the capacitive load to relay the sustain voltage.

Description

Energy recovery device and energy recovery method using the same {Apparatus of Energy Recovery and Energy Recovering Method Using the same}             

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

2 is a circuit diagram showing a conventional energy recovery device.

FIG. 3 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device shown in FIG. 2.

4 is a circuit diagram showing an energy recovery apparatus according to a first embodiment of the present invention.

FIG. 5 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device illustrated in FIG. 4.

FIG. 6 is a circuit diagram showing an on / off state and a current path of a switch element in the T1 period shown in FIG.

FIG. 7 is a circuit diagram showing an on / off state and a current path of a switch element in the period T2 shown in FIG.

FIG. 8 is a circuit diagram showing on / off states and current paths of the switch elements in the period T3 shown in FIG.

9 is a circuit diagram showing an on / off state and a current path of a switch element in the period T4 shown in FIG.

10 is a circuit diagram showing an on / off state and a current path of a switch element in the period T6 shown in FIG.

FIG. 11 is a circuit diagram showing an on / off state and a current path of a switch element in a period T7 shown in FIG.

FIG. 12 is a circuit diagram showing an on / off state and a current path of a switch element in the period T8 shown in FIG.

13 is a circuit diagram showing an energy recovery apparatus according to a second embodiment of the present invention.

FIG. 14 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device illustrated in FIG. 13.

FIG. 15 is a circuit diagram showing an on / off state and a current path of a switch element in the T1 period shown in FIG.

FIG. 16 is a circuit diagram showing an on / off state and a current path of a switch element in the period T2 shown in FIG.

FIG. 17 is a circuit diagram showing on / off states and current paths of switch elements in the period T3 shown in FIG. 14; FIG.

FIG. 18 is a circuit diagram showing on / off states and current paths of switch elements in the period T4 shown in FIG.

FIG. 19 is a circuit diagram showing an on / off state and a current path of a switch element in the period T6 shown in FIG.

20 is a circuit diagram showing an on / off state and a current path of a switch element in a period T7 shown in FIG.

FIG. 21 is a circuit diagram showing on / off states and current paths of switch elements in the period T8 shown in FIG.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, 12Z: transparent electrode

13Y, 13Z: bus electrode 14, 22: dielectric layer

16: protective film 18: lower substrate

24: partition 26: phosphor layer

30,130: energy charging unit 32,132: energy maintenance unit

34,134: energy relay

The present invention relates to an energy recovery apparatus and method, and more particularly, to an energy recovery apparatus and method for reducing the manufacturing cost.

Plasma Display Panels (hereinafter referred to as "PDPs") are characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view illustrating a discharge cell structure of a conventional plasma display panel.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a scan electrode Y and a sustain electrode Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 18. X). Each of the scan electrode Y and the sustain electrode Z has a line width smaller than the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed at one edge of the transparent electrode 13Y, 13Z).

The transparent electrodes 12Y and 12Y are usually formed on the upper substrate 10 by indium tin oxide (ITO). The metal bus electrodes 13Y and 13Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the sustain electrode Z side by side. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The passivation 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 X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The partition wall 24 is formed in a stripe or lattice shape to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert mixed gas is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

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 plurality of subfields are driven by being divided into reset periods, address periods, sustain periods, and erase periods.

Here, the reset period is a period in which uniform wall charges are formed in the discharge cells, the address period is a period in which selective address discharge occurs in accordance with the logic value of the video data, and the sustain period is a discharge cell in which the address discharge has occurred. Is a period for maintaining the discharge.

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 capable of energy recovery is used to minimize driving power required for address discharge and sustain discharge. The energy recovery apparatus recovers the voltage between the scan electrode Y and the sustain electrode Z and uses the voltage recovered as the driving voltage at the next discharge.

2 is a view showing an energy recovery device formed in the scan electrode Y to recover the sustain discharge voltage. In practice, the energy recovery device is symmetrically installed on the sustain electrode Z with respect to the panel capacitor Cp.

Referring to FIG. 2, a conventional energy recovery apparatus includes an inductor L connected between a panel capacitor Cp and a source capacitor Cs, and a parallel connection between the source capacitor Cs and the inductor L in parallel. The first and third switches S1 and S3, the diodes D5 and D6 installed between the first and third switches S1 and S3 and the inductor L, the inductor L and the panel capacitor Cp. ) And second and fourth switches S2 and S4 connected in parallel.

The panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z. FIG. The second switch S2 is connected to the reference 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.

To this end, the source capacitor Cs has a capacitance value capable of charging a voltage of Vs / 2 corresponding to half of the reference 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. The fifth and sixth diodes D5 and D6 prevent current from flowing in the reverse direction. In addition, the internal internal diodes D1 to D4 respectively installed in the first to fourth switches S1 to S4 also prevent the reverse current from flowing.

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.

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 reference voltage source Vs is supplied to the panel capacitor Cp. That is, when the second switch S2 is turned on, the voltage value of the reference voltage source Vs is supplied to the panel capacitor Cp to prevent the voltage value of the panel capacitor Cp from falling below the reference voltage source Vs. Thus, sustain discharge is stably generated. Here, since the voltage of the panel capacitor Cp rises to Vs in the period T1, the voltage value supplied from the outside during the period T2 can be minimized (that is, the power consumption can be reduced).

In the T3 period, the first switch S1 is turned off. In this case, the panel capacitor Cp maintains the voltage of the reference voltage source Vs. 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 scan electrode Y and the sustain electrode Z are obtained by periodically repeating the periods T1 to T6.

However, in order to install such a conventional energy recovery device, a large manufacturing cost is generated. That is, since the inductor L used in the conventional energy recovery device is an expensive device, there is a problem that the manufacturing cost increases.

Accordingly, it is an object of the present invention to provide an energy recovery apparatus and method that can reduce manufacturing costs.

In order to achieve the above object, the energy recovery apparatus according to the embodiment of the present invention is a capacitive load equivalently formed between the scan electrode and the sustain electrode, and the sustain voltage recovered from the capacitive load as the capacitive load. A voltage charger for resupply to charge the capacitive load; A voltage holding unit connected to the capacitive load to supply the sustain voltage so that stable discharge can be generated at the capacitive load charged with the sustain voltage; A voltage relay unit connected between the voltage charging unit and the capacitive load to relay the sustain voltage.

In the energy recovery device, the voltage relay includes a magnetic coupling inductor in which at least two coils are magnetically coupled.

The magnetic coupling inductor in the energy recovery device includes a first inductor connected to the voltage charging unit; And a second inductor connected in parallel to the capacitive load.

First and second capacitors in the energy recovery apparatus, wherein the voltage charging unit is connected between the voltage relay unit and a base voltage source to recover the sustain voltage to charge the capacitive load; A first switch connected between the voltage relay and a base voltage source and connected in parallel to the first capacitor to form a current path leading to the first inductor and the second capacitor; And a second switch connected between the voltage relay and the base voltage source and connected in parallel to the second capacitor to form a current path leading to the first inductor and the first capacitor.

In the energy recovery device, the coils of the first and second inductors are wound in the same direction.

In the energy recovery apparatus, the sustain voltage is supplied in one direction of the first inductor, and then is induced in the other direction of the second inductor and supplied to the scan electrode of the capacitive load.

In the energy recovery device, the coils of the first and second inductors are wound in opposite directions.

In the energy recovery apparatus, the sustain voltage is supplied in one direction of the first inductor, and then is induced in one direction of the second inductor and supplied to the scan electrode of the capacitive load.

A sustain voltage source for supplying the sustain voltage in the energy recovery device; Third and fourth switches disposed between the sustain voltage source and the base voltage source and turned on when the sustain voltage is supplied to the scan electrode of the capacitive load; And fifth and sixth switches installed between the sustain voltage source and the base voltage source to be turned on when the sustain voltage is supplied to the sustain electrode of the capacitive load.

In an energy recovery method according to an embodiment of the present invention, in the energy recovery method for relaying a voltage using a magnetic coupling inductor including a first and a second inductor, the first inductor Supplying; Supplying the sustain voltage induced in the second inductor to a capacitive load equivalently formed in a discharge cell when the sustain voltage is supplied to the first inductor; Recovering the sustain voltage charged in the capacitive load to the capacitor.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 21.

4 is a view showing an energy recovery apparatus according to a first embodiment of the present invention.

Referring to FIG. 4, the energy recovery apparatus according to the first embodiment of the present invention includes a panel capacitor Cp equivalently representing capacitance formed between the scan electrode Y and the sustain electrode Z; An energy charging unit 30 for charging energy (voltage and / or current) to the panel capacitor Cp; An energy holding part 32 for holding energy of the panel capacitor Cp; An energy relay unit 34 is provided to relay the energy of the energy charging unit 30 to the panel capacitor Cp.

The energy charging unit 30 is installed to be connected to the ground voltage source GND and the energy relay unit 34. The energy charging unit 30 may include the first and second switches Q1 and Q2 and the first and second to charge the sustain voltage Vs to the scan electrode Y and the sustain electrode Z of the panel capacitor Cp. Second capacitors C1 and C2 are provided. At this time, the first and second switches Q1 and Q2 are provided between the energy relay 34 and the ground voltage source GND. The first capacitor C1 is installed between the energy relay 34 and the ground voltage source GND, and is installed in parallel with the first switch Q1. The second capacitor C2 is installed between the energy relay 34 and the ground voltage source GND, and is installed in parallel with the second switch Q2. The second switch Q2 is turned on when the sustain voltage Vs charged in the first capacitor C1 is supplied to the scan electrode Y of the panel capacitor Cp. The first switch Q1 is turned on when the sustain voltage Vs charged in the second capacitor C2 is supplied to the sustain electrode Z of the panel capacitor Cp. Here, internal diodes D1 and D2 are installed in the first and second switches Q1 and Q2 to prevent reverse current.

The energy holding unit 32 is connected between the sustain voltage source Vs and the ground voltage source GND. The energy holding unit 32 supplies the sustain voltage Vs to maintain the sustain voltage Vs charged to the panel capacitor Cp by the energy charging unit 30. For this purpose, the energy holding unit 32 has third to sixth switches Q3 to Q6. At this time, the third and sixth switches Q3 and Q6 are provided between the sustain voltage source Vs and the ground voltage source GND. The fourth and fifth switches Q4 and Q5 are installed between the sustain voltage source Vs and the ground voltage source GND, and are connected to the third and sixth switches Q3 and Q6 in parallel. The third and fourth switches Q3 and Q4 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. The fifth and sixth switches Q5 and Q6 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. Here, internal diodes D3 to D6 are installed in the third to sixth switches Q3 to Q6 to prevent reverse current.

The energy relay unit 34 is installed between the panel capacitor Cp and the energy charging unit 30 to relay energy. To this end, the energy relay 34 includes a transformer. The transformer includes a first inductor L1 connected to the energy charging unit 30 and a second inductor L2 installed in parallel with the panel capacitor Cp. In this case, one terminal of the first inductor L1 is connected to the common terminal n1 of the first switch Q1 and the first capacitor C1, and the other terminal of the first inductor L1 is connected to the second switch ( Q2) and the common terminal n2 of the second capacitor C2. On the other hand, the coils of the first inductor L1 and the second inductor L2 are wound in the same direction. In addition, the winding ratios of the first inductor L1 and the second inductor L2 are experimentally set to facilitate energy transfer.

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.

Here, the operation process will be described in detail with the assumption that the Vs voltage is charged in the first capacitor C1 and the -Vs voltage is charged in the second capacitor C2 before the T1 period.

In the T1 period, the first and second switches Q1 and Q2 are turned on. When the first and second switches Q1 and Q2 are turned on, the base voltage source GND, the first switch Q1, the first inductor L1, and the second switch Q2 as shown in FIG. 6. Via the current path leading to the ground voltage source (GND) is formed. Accordingly, the ground potential GND is supplied to the first inductor L1. At this time, the ground potential GND supplied to the first inductor L1 is induced to the second inductor L2. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the ground potential GND induced by the second inductor L2 is the scan electrode Y of the panel capacitor Cp. Supplied by. Therefore, the scan electrode Y of the panel capacitor Cp maintains the ground potential GND during the period T1.

In the T2 period, the first switch Q1 is turned off and the second switch Q2 is maintained in the turn-on state. When the first switch Q1 is turned off and the second switch Q2 remains turned on, as shown in FIG. 7, the first capacitor C1, the first inductor L1, and the second switch Q1 are turned off. The current path leading to the ground voltage source GND is formed via the switch Q2. Accordingly, the Vs voltage charged in the first capacitor C1 is supplied to the first inductor L1. At this time, the Vs voltage supplied to the first inductor L1 is induced to the second inductor L2. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the voltage Vs induced by the second inductor L2 is supplied to the scan electrode Y of the panel capacitor Cp. . Therefore, the scan electrode Y of the panel capacitor Cp is charged with the voltage Vs during the period T2. On the other hand, the T2 period is set until the voltage Vs is charged in the scan electrode Y of the panel capacitor Cp.

In the period T3, the third and fourth switches Q3 and Q4 are turned on. When the third and fourth switches Q3 and Q4 are turned on, the sustain voltage source Vs, the third switch Q3, the scan electrode Y of the panel capacitor Cp, and the sustain as shown in FIG. A current path leading to the ground voltage source GND is formed via the electrode Z and the fourth switch Q4. Through this current path, the Vs voltage is supplied to the scan electrode Y of the panel capacitor Cp. The voltage Vs supplied to the scan electrode Y of the panel capacitor Cp during the T3 period causes the sustain sustain discharge to occur while maintaining the voltage of the scan electrode Y of the panel capacitor Cp at the voltage Vs.

In the T4 period, the second switch Q2 is turned on. When the second switch Q2 is turned on, the current leading to the base voltage source GND via the second switch Q2, the first inductor L1 and the first capacitor C1 as shown in FIG. 9. A pass is formed. At this time, the voltage Vs charged in the scan electrode Y of the panel capacitor Cp is discharged along the current flow. The discharged Vs voltage is supplied to the second inductor L2. The Vs voltage supplied to the second inductor L2 is induced to the first inductor L1. Since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the Vs voltage induced by the first inductor L1 is recovered to the first capacitor C1 along the current path. During the T5 period, the ground potential (GND) is maintained.

In the T6 period, the first switch Q1 is turned on. When the first switch Q1 is turned on, the current leading to the base voltage source GND via the second capacitor C2, the first inductor L1 and the first switch Q1 as shown in FIG. 10. A pass is formed. Accordingly, the voltage -Vs charged in the second capacitor C2 is supplied to the first inductor L1. At this time, the -Vs voltage supplied to the first inductor L1 is induced to the second inductor L2. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the -Vs voltage induced by the second inductor L2 is supplied to the sustain electrode Z of the panel capacitor Cp. do. Therefore, the sustain electrode Z of the panel capacitor Cp is charged with the voltage -Vs during the period T6. Here, the -Vs voltage charged to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the sustain electrode Z is charged with the Vs voltage.) This T6 period is set until the -Vs voltage is charged to the sustain electrode Z of the panel capacitor Cp.

In the period T7, the fifth and sixth switches Q5 and Q6 are turned on. When the fifth and sixth switches Q5 and Q6 are turned on, as shown in FIG. 11, the sustain voltage source Vs, the fifth switch Q5, the sustain electrode Z of the panel capacitor Cp, and the scan are shown. A current path is formed which leads to the ground voltage source GND via the electrode Y and the sixth switch Q6. Through this current path, the -Vs voltage is supplied to the sustain electrode Z of the panel capacitor Cp. The -Vs voltage supplied to the sustain electrode Z of the panel capacitor Cp during the T7 period causes the sustain sustain discharge to occur while maintaining the voltage of the sustain electrode Z of the panel capacitor Cp at -Vs. . The voltage -Vs supplied to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the voltage Vs is supplied to the sustain electrode Z.)

In the T8 period, the first switch Q1 is turned on. When the first switch Q1 is turned on, the current leading to the base voltage source GND via the first switch Q1, the first inductor L1, and the second capacitor C2 as shown in FIG. 12. A pass is formed. At this time, the voltage of -Vs charged in the sustain electrode Z of the panel capacitor Cp is discharged along the current flow. The discharged -Vs voltage is supplied to the second inductor L2. The -Vs voltage supplied to the second inductor L2 is induced to the first inductor L1. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the -Vs voltage induced by the first inductor L1 is recovered to the second capacitor C2 along the current path. . Here, the -Vs voltage recovered from the sustain electrode Z of the panel capacitor Cp to the second capacitor C2 is a relative voltage based on the scan electrode Y. In fact, the second capacitor C2 In fact, the energy recovery apparatus according to the present invention provided on both sides of the panel capacitor Cp supplies the AC drive pulse to the panel capacitor Cp while repeating the periods T1 to T8.

The energy recovery apparatus according to the first embodiment of the present invention can reduce the manufacturing cost by using a transformer having a low installation cost.

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

Referring to FIG. 13, the energy recovery apparatus according to the second embodiment of the present invention includes a panel capacitor Cp equivalently representing capacitance formed between the scan electrode Y and the sustain electrode Z; An energy charging unit 130 for charging energy (voltage and / or current) to the panel capacitor Cp; An energy holding unit 132 for holding energy of the panel capacitor Cp; An energy relay unit 134 is provided to relay the energy of the energy charging unit 130 to the panel capacitor Cp.

The energy charging unit 130 is installed to be connected to the ground voltage source GND and the energy relay unit 134. The energy charging unit 130 may include the eleventh and twelfth switches Q11 and Q12, the eleventh and the like to charge the sustain voltage Vs to the scan electrode Y and the sustain electrode Z of the panel capacitor Cp. Twelfth capacitors C11 and C12 are provided. At this time, the eleventh and twelfth switches Q11 and Q12 are provided between the energy relay unit 134 and the ground voltage source GND. The eleventh capacitor C11 is installed between the energy relay unit 134 and the ground voltage source GND, and is installed in parallel with the eleventh switch Q11. The twelfth capacitor C12 is installed between the energy relay unit 134 and the base voltage source GND, and is installed in parallel with the twelfth switch Q12. The twelfth switch Q12 is turned on when the sustain voltage Vs charged in the eleventh capacitor C11 is supplied to the scan electrode Y of the panel capacitor Cp. The eleventh switch Q11 is turned on when the sustain voltage Vs charged in the twelfth capacitor C2 is supplied to the sustain electrode Z of the panel capacitor Cp. Here, the internal diodes D11 and D12 are installed in the eleventh and twelfth switches Q11 and Q12 to prevent reverse current.

The energy holding unit 132 is connected between the sustain voltage source Vs and the ground voltage source GND. The energy holding unit 132 supplies the sustain voltage Vs to maintain the sustain voltage Vs charged to the panel capacitor Cp by the energy charging unit 130. To this end, the energy holding unit 132 includes thirteenth to sixteenth switches Q13 to Q16. At this time, the thirteenth and sixteenth switches Q13 and Q16 are provided between the sustain voltage source Vs and the ground voltage source GND. The fourteenth and fifteenth switches Q14 and Q15 are provided between the sustain voltage source Vs and the ground voltage source GND, and are connected to the thirteenth and sixteenth switches Q13 and Q16 in parallel. The thirteenth and fourteenth switches Q13 and Q14 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. The fifteenth and sixteenth switches Q15 and Q16 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. Here, the internal diodes D13 to D16 are installed in the thirteenth to sixteenth switches Q13 to Q16 to prevent reverse current.

The energy relay unit 134 is installed between the panel capacitor Cp and the energy charging unit 130 to relay energy. To this end, the energy relay unit 134 includes a transformer. The transformer includes an eleventh inductor L11 connected to the energy charging unit 130 and a twelfth inductor L12 installed in parallel with the panel capacitor Cp. In this case, one terminal of the eleventh inductor L11 is connected to the common terminal n11 of the eleventh switch Q11 and the eleventh capacitor C11, and the other terminal of the eleventh inductor L11 is connected to the twelfth switch ( Q12) and the common terminal n12 of the twelfth capacitor C12. On the other hand, the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions. The winding ratios of the eleventh inductor L11 and the twelfth inductor L12 are experimentally set to facilitate energy transfer.

FIG. 14 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 13 and output waveforms of the panel capacitor.

Here, the operation process will be described in detail with the assumption that the -Vs voltage is charged in the eleventh capacitor C11 and the Vs voltage is charged in the twelfth capacitor C12 before the T1 period.

In the T1 period, the eleventh and twelfth switches Q11 and Q12 are turned on. When the eleventh and twelfth switches Q11 and Q12 are turned on, as shown in FIG. 15, the base voltage source GND, the second switch Q12, the eleventh inductor L11, and the eleventh switch Q11. Via the current path leading to the ground voltage source (GND) is formed. Accordingly, the ground potential GND is supplied to the eleventh inductor L11. At this time, the ground potential GND supplied to the eleventh inductor L11 is induced to the twelfth inductor L12. Here, since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the ground potential GND induced by the twelfth inductor L12 is the scan electrode Y of the panel capacitor Cp. Supplied by. Therefore, the scan electrode Y of the panel capacitor Cp maintains the ground potential GND during the period T1.

In the T2 period, the eleventh switch Q11 is kept turned on, and the twelfth switch Q12 is turned off. When the eleventh switch Q11 is turned on and the twelfth switch Q12 is turned off, as illustrated in FIG. 16, the twelfth capacitor C12, the eleventh inductor L11, and the eleventh The current path leading to the ground voltage source GND is formed via the switch Q11. Accordingly, the Vs voltage charged in the twelfth capacitor C12 is supplied to the eleventh inductor L11. At this time, the Vs voltage supplied to the eleventh inductor L11 is induced to the twelfth inductor L12. Since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the voltage Vs induced by the twelfth inductor L12 is supplied to the scan electrode Y of the panel capacitor Cp. . Therefore, the scan electrode Y of the panel capacitor Cp is charged with the voltage Vs during the period T2. On the other hand, the T2 period is set until the voltage Vs is charged in the scan electrode Y of the panel capacitor Cp.

In the T3 period, the thirteenth and fourteenth switches Q13 and Q14 are turned on. When the thirteenth and fourteenth switches Q13 and Q14 are turned on, as shown in FIG. 17, the sustain voltage source Vs, the thirteenth switch Q13, and the scan electrode Y of the panel capacitor Cp are maintained. The current path leading to the ground voltage source GND is formed via the electrode Z and the fourteenth switch Q14. Through this current path, the Vs voltage is supplied to the scan electrode Y of the panel capacitor Cp. The voltage Vs supplied to the scan electrode Y of the panel capacitor Cp during the T3 period causes the sustain sustain discharge to occur while maintaining the voltage of the scan electrode Y of the panel capacitor Cp at the voltage Vs.

In the T4 period, the eleventh switch Q11 is turned on. When the eleventh switch Q11 is turned on, a current leading to the base voltage source GND via the eleventh switch Q11, the eleventh inductor L11, and the twelfth capacitor C12 as shown in FIG. 18. A pass is formed. At this time, the voltage Vs charged in the scan electrode Y of the panel capacitor Cp is discharged along the current flow. The discharged Vs voltage is supplied to the twelfth inductor L12. The voltage Vs supplied to the twelfth inductor L12 is induced to the eleventh inductor L11. Here, since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the Vs voltage induced by the eleventh inductor L11 is recovered to the twelfth capacitor C12 along the current path. During the T5 period, the ground potential (GND) is maintained.

In the T6 period, the twelfth switch Q12 is turned on. When the twelfth switch Q12 is turned on, a current leading to the base voltage source GND via the eleventh capacitor C11, the eleventh inductor L11, and the twelfth switch Q12 as shown in FIG. 19. A pass is formed. Accordingly, the -Vs voltage charged in the eleventh capacitor C11 is supplied to the eleventh inductor L11. At this time, the -Vs voltage supplied to the eleventh inductor L11 is induced to the twelfth inductor L12. Since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the -Vs voltage induced by the twelfth inductor L12 is supplied to the sustain electrode Z of the panel capacitor Cp. do. Therefore, the sustain electrode Z of the panel capacitor Cp is charged with the voltage -Vs during the period T6. Here, the -Vs voltage charged to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the sustain electrode Z is charged with the Vs voltage.) This T6 period is set until the -Vs voltage is charged to the sustain electrode Z of the panel capacitor Cp.

In the period T7, the fifteenth and sixteenth switches Q15 and Q16 are turned on. When the fifteenth and sixteenth switches Q15 and Q16 are turned on, as shown in FIG. 20, the sustain voltage source Vs, the fifteenth switch Q15, the sustain electrode Z of the panel capacitor Cp, and the scan are shown. A current path leading to the ground voltage source GND is formed via the electrode Y and the sixteenth switch Q16. Through this current path, the -Vs voltage is supplied to the sustain electrode Z of the panel capacitor Cp. The -Vs voltage supplied to the sustain electrode Z of the panel capacitor Cp during the T7 period causes the sustain sustain discharge to occur while maintaining the voltage of the sustain electrode Z of the panel capacitor Cp at -Vs. . The voltage -Vs supplied to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the voltage Vs is supplied to the sustain electrode Z.)

In the T8 period, the twelfth switch Q12 is turned on. When the twelfth switch Q12 is turned on, a current leading to the base voltage source GND via the twelfth switch Q12, the eleventh inductor L11, and the eleventh capacitor C11 as shown in FIG. 21. A pass is formed. At this time, the voltage of -Vs charged in the sustain electrode Z of the panel capacitor Cp is discharged along the current flow. The discharged -Vs voltage is supplied to the twelfth inductor L12. The -Vs voltage supplied to the twelfth inductor L12 is induced to the eleventh inductor L11. Here, since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the -Vs voltage induced by the eleventh inductor L11 is recovered to the eleventh capacitor C11 along the current path. . Herein, the voltage -Vs recovered from the sustain electrode Z of the panel capacitor Cp to the eleventh capacitor C11 is a relative voltage based on the scan electrode Y. In fact, in the eleventh capacitor C11, In fact, the energy recovery apparatus according to the present invention provided on both sides of the panel capacitor Cp supplies the AC drive pulse to the panel capacitor Cp while repeating the periods T1 to T8.

The energy recovery apparatus according to the second embodiment of the present invention reduces manufacturing costs by using a transformer having a low installation cost.

As described above, the energy recovery apparatus and method according to the present invention can reduce the manufacturing cost because the transformer installed in parallel to the panel capacitor relays the energy.

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 (12)

A capacitive load equivalently formed between the scan electrode and the sustain electrode, A voltage holding unit for supplying the sustain voltage so that stable discharge can be generated at the capacitive load connected to the capacitive load and charged with a sustain voltage; A voltage relay unit having first and second inductors, for relaying the sustain voltage through the first and second inductors; First and second capacitors connected between the voltage relay unit and a ground voltage source to recover the sustain voltage relayed by the voltage relay unit to charge the capacitive load; A first switch connected between the voltage relay and a base voltage source and connected in parallel to the first capacitor to form a current path leading to the first inductor and the second capacitor; And a second switch connected between the voltage relay and the base voltage source and connected in parallel to the second capacitor to form a current path leading to the first inductor and the first capacitor. The method of claim 1, And the voltage relay unit includes a magnetic coupling inductor in which at least two coils are magnetically coupled to each other. The method of claim 2, The magnetic coupling inductor, A first inductor having one terminal connected to a common terminal of the first switch and the first capacitor and the other terminal connected to a common terminal of the second switch and the second capacitor; And said second inductor connected in parallel to said capacitive load. delete The method of claim 3, wherein And the coils of the first and second inductors are wound in the same direction. The method of claim 5, And the sustain voltage is supplied in one direction of the first inductor and then induced in the other direction of the second inductor and supplied to the scan electrode of the capacitive load. The method of claim 3, wherein And the coils of the first and second inductors are wound in opposite directions. The method of claim 7, wherein And the sustain voltage is supplied in one direction of the first inductor and then induced in one direction of the second inductor and supplied to the scan electrode of the capacitive load. The method of claim 1, The voltage holding unit A sustain voltage source for supplying the sustain voltage; Third and fourth switches disposed between the sustain voltage source and the base voltage source and turned on when the sustain voltage is supplied to the scan electrode of the capacitive load; And a fifth and a sixth switch disposed between the sustain voltage source and the base voltage source and turned on when the sustain voltage is supplied to the sustain electrode of the capacitive load. A magnetic recovery inductor comprising a first and a second inductor, first and second switches forming a current path, and first and second capacitors for charging a recovery voltage. In Supplying a sustain voltage charged in an externally formed capacitor to the first inductor; When the first switch is turned off and the second switch is turned on to form a current path leading to a base voltage source via the first capacitor, the first inductor, and the second switch, the first capacitor is charged with the Supplying the sustain voltage induced in the second inductor to a capacitive load equivalently formed in a discharge cell when a sustain voltage is supplied to the first inductor; When the first switch is turned on and the second switch is turned off to form a current path leading to a base voltage source via the second capacitor, the first inductor, and the first switch, the second capacitor is charged with the Supplying the sustain voltage induced in the second inductor to the capacitive load equivalently formed in the discharge cell when a sustain voltage is supplied to the first inductor; And recovering the sustain voltage charged in the capacitive load to the first and second capacitors when the first and second switches are turned on to form a current path. The method of claim 10, And the coils of the first and second inductors are wound in the same direction. The method of claim 10, And the coils of the first and second inductors are wound in opposite directions.

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