JP2006098436A - Energy recovery apparatus and method of plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy recovery apparatus and a method of a plasma display panel capable of reducing a manufacturing cost. <P>SOLUTION: The energy recovery apparatus of the invention comprises; a capacitive load formed equivalently between a scanning electrode and a sustain electrode; an energy recovery section for recovering energy which is charged in the capacitive load and for re-supplying the recovered energy to the capacitive load; an energy supply section provided between the energy recovery section and the capacitive load, in which the energy is relayed between the energy recovery section and the capacitive load and in which a reference voltage is supplied to the capacitive load so that stable discharge may be generated in the capacitive load; and an energy relay section provided between the energy recovery section and the energy supply section, in which the energy is relayed between the energy recovery section and the energy supply section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plasma display panel, and more particularly, to an energy recovery apparatus and method for a plasma display panel.

  A plasma display panel (hereinafter referred to as “PDP”) is a character or graphic that emits phosphors with ultraviolet rays of 147 nm generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe, or He + Ne + Xe. An image containing is displayed. Such a PDP can be easily made thinner and larger, and provides image quality greatly improved by recent technological development. In particular, the three-electrode surface discharge type PDP accumulates wall charges on the surface during discharge and protects each electrode from sputtering generated by the discharge, so that it can be driven at a low voltage and has a long life. Have.

  FIG. 1 is a perspective view showing a discharge cell structure of a conventional plasma display panel. As shown in FIG. 1, the discharge cell of the conventional plasma display panel includes a scan electrode Y and a sustain electrode Z formed on the upper substrate 10, and an address electrode X formed on the lower substrate 18. Each of the scan electrode Y and the sustain electrode Z has a line width smaller than the line width of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z. Including.

  The transparent electrodes 12Y and 12Z are generally formed on the upper substrate 10 by using indium tin oxide (hereinafter referred to as “ITO”). The metal bus electrodes 13Y and 13Z are usually formed on the transparent electrodes 12Y and 12Z with a metal such as chromium (Cr), and serve to reduce a voltage drop caused by the high-resistance transparent electrodes 12Y and 12Z. An upper dielectric layer 14 and a protective film 16 are stacked on the upper substrate 10 in which the scan electrodes Y and the sustain electrodes Z are formed side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. The protective film 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases the efficiency of secondary electron emission. As the protective film 16, magnesium oxide (MgO) is usually used.

  A lower dielectric layer 22 and barrier ribs 24 are formed on the lower substrate 18 on which the address electrodes X are formed, and a phosphor layer 26 is applied to the surfaces of the lower dielectric layer 22 and the barrier ribs 24. The address electrode X is formed in a direction crossing the scan electrode Y and the sustain electrode Z. The barrier ribs 24 are formed in a stripe or lattice shape, and prevent ultraviolet rays and visible light generated by discharge from leaking to adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated at the time of plasma discharge, and generates any one visible light of red, green or blue. An inert mixed gas is injected into the discharge space of the discharge cell provided between the upper / lower substrates 10 and 18 and the barrier ribs 24.

Such a three-electrode surface discharge type PDP is driven by being separated into a number of subfields, and in each subfield period, light emission proceeds in proportion to the weighted value of the video data, so that gradation display is performed. become. A number of subfields are again driven by being divided into a reset period, an address period, a sustain period, and an erase period.
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 is generated according to the logical value of video data, and the sustain period is the address discharge. This is a period in which the discharge is maintained in the discharge cell in which the occurrence of spill occurs.

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

FIG. 2 is a diagram illustrating an energy recovery device formed on the scan electrode Y in order to recover the sustain discharge voltage. Actually, the energy recovery device is also symmetrically installed on the sustain electrode Z around the panel capacitor Cp.
As shown in FIG. 2, the conventional energy recovery apparatus includes an inductor L connected between the panel capacitor Cp and the source capacitor Cs, and a first connected in parallel between the source capacitor Cs and the inductor L. And third switches S1 and S3, diodes D5 and D6 installed between the first and third switches S1 and S3 and the inductor L, and a first connected in parallel between the inductor L and the panel capacitor Cp. 2 and 4th switch S2, S4.

  The panel capacitor Cp is an equivalent representation of the capacitance formed between the scan electrode Y and the sustain electrode Z. The second switch S2 is connected to the reference voltage source Vs, and the fourth switch S4 is connected to the base voltage source GND. The source capacitor Cs collects and charges the voltage charged in the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again.

  For this reason, the source capacitor Cs can be charged with a voltage of Vs / 2, which is a half value 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. At the same time, the internal diodes D1 to D4 respectively installed in the first to fourth switches SI to S4 also prevent reverse current flow.

FIG. 3 is a timing diagram and a waveform diagram showing the on / off timing of each switch shown in FIG. 2 and the output waveform of the panel capacitor.
The operation process will be described in detail on the assumption that the panel capacitor Cp is charged with a voltage of 0 V 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, and a current path is formed 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 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 resonance circuit, the panel capacitor Cp is charged with a Vs voltage that is twice that of the source capacitor Cs.

  In the period T2, 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, and the voltage value of the panel capacitor Cp is prevented from dropping below the reference voltage source Vs, thereby being stabilized. Sustain discharge occurs. Here, since the voltage of the panel capacitor Cp has increased to Vs during the period T1, the voltage value supplied from the outside during the period T2 is minimized. That is, power consumption can be reduced.

  In the period T3, the first switch S1 is turned off. At this time, the panel capacitor Cp maintains the voltage of the reference voltage source Vs. In the period T4, 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 via the inductor L and the third switch S3, and the voltage charged in the panel capacitor Cp is recovered by the source capacitor Cs. The At this time, the source capacitor Cs is charged with a voltage of Vs / 2.

  In the period T5, 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 ground voltage source GND, and the voltage of the panel capacitor Cp drops to 0V. In the T6 period, the T5 state is maintained for a predetermined time. Actually, the AC drive pulse supplied to the scan electrode Y and the sustain electrode Z is obtained while the periods T1 to T6 are periodically repeated.

  However, many manufacturing costs are required to install such a conventional energy recovery device. Explaining this in detail, the elements (diodes, switching elements, etc.) used in the conventional energy recovery apparatus must have a withstand voltage capable of withstanding the voltage value of the reference voltage source Vs. In addition, the fifth and sixth diodes D5 and D6 need to have a quick response speed. Therefore, conventionally, it is necessary to use a large number of elements having a quick response speed and a high withstand voltage, and thus there is a disadvantage that a lot of manufacturing costs are required.

  The present invention has been made to solve such conventional problems, and an object of the present invention is to provide an energy recovery apparatus and method capable of reducing the manufacturing cost.

  An energy recovery device according to an embodiment of the present invention recovers a capacitive load equivalently formed between a scan electrode and a sustain electrode, energy charged in the capacitive load, and recovered energy. Is installed between the energy recovery unit and the capacitive load, and relays energy between the energy recovery unit and the capacitive load. An energy supply unit for supplying a reference voltage to the capacitive load so that a stable discharge can be generated in the capacitive load; and the energy recovery unit and the energy supply unit. And an energy relay unit for relaying energy between the recovery unit and the energy supply unit.

  The energy recovery unit stores energy recovered from the capacitive load, and re-supplyes the stored energy to the capacitive load; the source capacitor and a ground voltage source; And a first switching element that is turned on when the energy charged in the source capacitor is supplied to the energy relay unit.

The energy supply unit may include a second switching element connected to a reference voltage source that supplies the reference voltage, and a third and a third switching element connected in parallel between the second switching element and the base voltage source. And 4 switching elements.
The energy relay unit may include a magnetically coupled inductor in which at least two coils are magnetically coupled.

The magnetically coupled inductor includes a first inductor installed between the first switching element and the source capacitor, and a second inductor installed between the second switching element and the third switching element. And.
The third switching element may be turned on when the second inductor is charged using energy charged in the capacitive load.

The fourth switching element is turned on when a base potential is supplied to the capacitive load.
The coils of the first inductor and the second inductor are wound in the same direction.
The coils of the first inductor and the second inductor are wound in different directions.

  An energy recovery method according to an embodiment of the present invention includes a first stage of charging a first inductor of a magnetically coupled inductor using energy charged in a source capacitor, and when the energy is charged in the first inductor. A second stage in which energy is charged in the second inductor of the magnetically coupled inductor, and the energy charged in the second inductor is supplied to a capacitive load formed equivalently between the scan electrode and the sustain electrode. And a third stage.

The energy charged in the second inductor is supplied to the capacitive load when the energy supplied to the first inductor is cut off.
The energy charged in the second inductor may be charged and supplied to the capacitive load.
Further, the reference voltage is charged to the capacitive load in the third stage.

Further, after the third step, the method further includes a step of supplying a voltage value of the reference voltage source to the capacitive load for a predetermined time.
The energy recovery method may include a fourth stage in which the second inductor is charged using energy charged in the capacitive load, and energy is supplied to the first inductor when the second inductor is charged with energy. The method further includes a fifth stage in which the first capacitor is charged and a sixth stage in which the source capacitor is charged using the energy charged in the first inductor.

The energy charged in the first inductor is supplied to the source capacitor when the energy supplied to the second inductor is cut off.
The energy charged in the first inductor is charged and supplied to the source capacitor.

  According to the energy recovery apparatus and method of the present invention, a transformer is installed to relay energy between the source capacitor and the panel capacitor, so that it is not necessary to install an additional diode, thereby reducing manufacturing costs. Can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 4 is a diagram illustrating an energy recovery apparatus according to an embodiment of the present invention. In FIG. 4, the energy recovery device is illustrated only on one side of the panel capacitor Cp. However, the energy recovery device is actually installed on both side surfaces symmetrically about the panel capacitor Cp.
As shown in FIG. 4, the energy recovery apparatus according to the embodiment of the present invention includes an energy (voltage and / or current) recovery unit 30, an energy supply unit 32, and an energy relay unit 34.

  The energy recovery unit 30 recovers energy from the energy supply unit 32 and re-supplys the recovered energy to the energy supply unit 32. For this purpose, the energy recovery unit 30 includes a source capacitor Cs and a first switch S1. The source capacitor Cs collects and charges the voltage charged in the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again. The first switch S <b> 1 is turned on when energy is supplied to the energy relay unit 34. Here, the first switch S1 is provided with an internal diode D1 for preventing reverse current. An energy relay unit 34 is installed between the first switch S1 and the source capacitor Cp.

  The energy supply unit 32 is connected to the reference voltage source Vs, the ground voltage source GND, and the panel capacitor Cp. The energy supply unit 32 supplies the energy supplied from the energy relay unit 34 to the panel capacitor Cp and re-supplys the energy supplied from the panel capacitor Cp to the energy relay unit 34. The energy supply unit 32 supplies the voltage value of the reference voltage source Vs to the panel capacitor Cp.

  For this purpose, the energy supply unit 32 includes a third switch S3 connected to the reference voltage source Vs, and second and fourth switches S2 connected in parallel between the third switch S3 and the base voltage source GND. S4. An energy relay unit 34 is installed between the second switch S2 and the third switch S3. The third switch S3 is turned on when the reference voltage Vs is supplied to the panel capacitor Cp. The second switch S2 is turned on when the voltage charged in the panel capacitor Cp is recovered by the energy recovery unit 30 (turned on when the energy charged in the panel capacitor Cp is accurately supplied to the energy relay unit 34. ) The fourth switch S4 is turned on when the base voltage GND is supplied to the panel capacitor Cp. Each of the second to fourth switches S2 to S4 is provided with internal diodes D2 to D4 for preventing reverse current.

  The energy relay unit 34 is installed between the energy recovery unit 30 and the energy supply unit 32 to relay energy. For this purpose, the energy relay unit 34 includes a transformer. The transformer is a first inductor L1 installed in the energy recovery unit 30 (installed between Cs and S1) and a second inductor L2 installed in the energy supply unit 32 (installed between S2 and Cp). And comprising. The coils of the first inductor L1 and the second inductor L2 are wound in opposite directions. Further, the winding ratio of the first inductor L1 and the second inductor L2 is experimentally set so that energy transfer can be easily performed. On the other hand, the panel capacitor Cp represents an equivalent capacitance formed between the scan electrode and the sustain electrode.

FIG. 5 is a timing diagram and a waveform diagram showing the on / off timing of each switch shown in FIG. 4 and the output waveform of the panel capacitor.
The operation process will be described in detail on the assumption that the panel capacitor Cp is charged with 0 volt and the source capacitor Cs is charged with a predetermined voltage before the T1 period.

  In the T1 period, the first switch S1 is turned on. When the first switch S1 is turned on, a current path is formed from the source capacitor Cs to the first inductor L1 and the first switch S1 of the transformer. At this time, the current (or energy) supplied from the source capacitor Cs is charged in the first inductor L1. On the other hand, when the current is charged in the first inductor L1, the current is also charged in the second inductor L2. However, since the coils of the first inductor L1 and the second inductor L2 are wound in opposite directions, the current charged in the second inductor L2 cannot be supplied to the panel capacitor Cp (here, the second switch S2 has the second switch S2). Since the internal diode D2 is positioned in the reverse direction, the current charged in the first inductor L2 is not supplied to the base voltage source GND).

  In the period T2, the first switch S1 is turned off. That is, when the first inductor L1 is charged with a predetermined current (in other words, when the current of the first inductor L1 reaches a predetermined value), the first switch S1 is turned off. When the first switch S1 is turned off, the polarity of the second inductor L2 is reversed. At this time, the current charged in the second inductor L2 is supplied to the panel capacitor Cp (since the internal diode D2 of the second switch S2 is positioned in the forward direction, a current path is formed). Such a T2 period is continued until the voltage value of Vs is charged in the panel capacitor Cp.

  In the T3 period, the third switch S3 is turned on. When the third switch S3 is turned on, the voltage value of the reference voltage source Vs is supplied to the panel capacitor Cp, and the voltage value of the panel capacitor Cp is prevented from dropping below the reference voltage source Vs, thereby stabilizing the sustain discharge. Will occur. Here, since the voltage value of the panel capacitor Cp has increased to Vs in the T2 period, the voltage value supplied from the outside during the T3 period is minimized (that is, the power consumption can be reduced).

  In the period T4, the second switch S2 is turned on. When the second switch S2 is turned on, a current path connected to the panel capacitor Cp, the second inductor L2, and the second switch S2 is formed, and the voltage charged in the panel capacitor Cp is supplied to the second inductor L2. At this time, the second inductor L2 is charged with a predetermined current. On the other hand, when the current is charged in the second inductor L2, the current is also charged in the first inductor L1. However, since the coils of the second inductor L2 and the first inductor L1 are wound in opposite directions, the current charged in the first inductor L1 cannot be supplied to the source capacitor Cs (here, the first switch S1 Since the internal diode D1 is positioned in the reverse direction, the current charged in the first inductor L1 is not supplied to the base voltage source GND).

  In the period T5, the second switch S2 is turned off. When the second switch S2 is turned off, the polarity of the first inductor L1 is reversed. At this time, the current charged in the first inductor L1 is supplied to the source capacitor Cs (since the internal diode D1 of the first switch S1 is positioned in the forward direction, a current path is formed). That is, the source capacitor Cs recovers energy from the panel capacitor Cp via the transformer.

In the period T6, the fourth switch S4 is turned on. When the fourth switch S4 is turned on, the panel capacitor Cp is connected to the ground voltage source GND. Actually, the energy recovery apparatus of the present invention installed on both sides of the panel capacitor Cp supplies the AC drive pulse to the panel capacitor Cp while alternately repeating the periods T1 to T6.
On the other hand, the energy recovery device of the present invention can omit the installation of the two diodes D5 and D6 as compared with the conventional energy recovery device shown in FIG. Here, in the present invention, a transformer is installed in place of the two diodes D5 and D6, but such a transformer has a lower installation cost than the diodes D5 and D6 having a high breakdown voltage. Therefore, when the energy recovery device of the present invention is used, the manufacturing cost is reduced.

FIG. 6 is a view showing an energy recovery apparatus according to another embodiment of the present invention. Although FIG. 6 illustrates the energy recovery device only on one side of the panel capacitor Cp, the energy recovery devices are actually installed on both side surfaces symmetrically about the panel capacitor Cp.
As shown in FIG. 6, the energy recovery apparatus according to another embodiment of the present invention includes an energy (voltage and / or current) recovery unit 40, an energy supply unit 42, and an energy relay unit 44.

  The energy recovery unit 40 recovers energy from the energy supply unit 42 and re-supplys the recovered energy to the energy supply unit 42. For this purpose, the energy recovery unit 40 includes a source capacitor Cs and a first switch S1. The source capacitor Cs collects and charges the voltage charged in the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again. The first switch S <b> 1 is turned on when energy is supplied to the energy relay unit 44. Here, an internal diode D1 for preventing reverse current is installed in the first switch S1. An energy relay unit 44 is installed between the first switch S1 and the source capacitor Cp.

  The energy supply unit 42 is connected to the reference voltage source Vs, the ground voltage source GND, and the panel capacitor Cp. Such an energy supply unit 42 supplies the energy supplied from the energy relay unit 44 to the panel capacitor Cp, and re-supplys the energy supplied from the panel capacitor Cp to the energy relay unit 44. The energy supply unit 42 supplies the voltage value of the reference voltage source Vs to the panel capacitor Cp.

  For this purpose, the energy supply unit 42 includes a third switch S3 connected to the reference voltage source Vs, and second and fourth switches S2 connected in parallel between the third switch S3 and the ground voltage source GND. S4. An energy relay unit 44 is installed between the second switch S2 and the third switch S3. The third switch S3 is turned on when the reference voltage Vs is supplied to the panel capacitor Cp. The second switch S2 is turned on when the voltage charged in the panel capacitor Cp is recovered by the energy recovery unit 30 (turned on when the energy charged accurately in the panel capacitor Cp is supplied to the energy relay unit 44. ) The fourth switch S4 is turned on when the base voltage GND is supplied to the panel capacitor Cp. Each of the second to fourth switches S2 is provided with internal diodes D2 to D4 for preventing reverse current.

  The energy relay unit 44 is installed between the energy recovery unit 40 and the energy supply unit 42 to relay energy. For this purpose, the energy relay unit 44 includes a transformer. The transformer is a first inductor L1 installed in the energy recovery unit 40 (installed between Cs and S1) and a second inductor L2 installed in the energy supply unit 42 (installed between S2 and Cp). And comprising. The coils of the first inductor L1 and the second inductor L2 are wound in the same direction. Further, the winding ratio of the first inductor L1 and the second inductor L2 is experimentally set so that energy transfer can be easily performed. On the other hand, the panel capacitor Cp represents an equivalent capacitance formed between the scan electrode and the sustain electrode.

FIG. 7 is a timing chart and a waveform diagram showing the on / off timing of each switch shown in FIG. 6 and the 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 predetermined voltage before the T1 period.

  In the T1 period, the first switch S1 is turned on. When the first switch S1 is turned on, a current path is formed from the source capacitor Cs to the first inductor L1 and the first switch S1 of the transformer. At this time, the current (or energy) supplied from the source capacitor Cs is charged in the first inductor L1. On the other hand, when the current is charged in the first inductor L1, the current is also charged in the second inductor L2. At this time, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the current charged in the second inductor L2 is supplied to the panel capacitor Cp (here, the second switch Since the internal diode D2 of S2 is positioned in the forward direction, a current path is formed). Such a T1 period is continued until the voltage value of Vs is charged in the panel capacitor Cp.

  In the period T2, the third switch S3 is turned on. When the third switch S3 is turned on, the voltage value of the reference voltage source Vs is supplied to the panel capacitor Cp, and the voltage value of the panel capacitor Cp is prevented from dropping below the reference voltage source Vs, thereby stabilizing the sustain discharge. Will occur. Here, since the voltage value of the panel capacitor Cp has increased to Vs during the T1 period, the voltage value supplied from the outside during the T2 period is minimized (that is, the power consumption can be reduced).

  In the period T3, the second switch S2 is turned on. When the second switch S2 is turned on, a current path connected to the panel capacitor Cp, the second inductor L2, and the second switch S2 is formed, and energy charged in the panel capacitor Cp is supplied to the second inductor L2. At this time, the second inductor L2 is charged with a predetermined current. On the other hand, when the current is charged in the second inductor L2, the current is also charged in the first inductor L1. At this time, since the coils of the second inductor L2 and the first inductor L1 are wound in the same direction, the current charged in the first inductor L1 is supplied to the source capacitor Cs (here, the first capacitor Since the internal diode D1 of the switch S1 is positioned in the forward direction, a current path is formed). That is, the source capacitor Cs recovers energy from the panel capacitor Cp through the transformer.

In the period T4, the fourth switch S4 is turned on. When the fourth switch S4 is turned on, the panel capacitor Cp is connected to the ground voltage source GND. Actually, the energy recovery apparatus of the present invention installed on both sides of the panel capacitor Cp supplies the AC drive pulse to the panel capacitor Cp while alternately repeating the periods T1 to T4.
On the other hand, the energy recovery apparatus according to another embodiment of the present invention can omit the installation of the two diodes D5 and D6 as compared with the conventional energy recovery apparatus shown in FIG. Here, in the present invention, the transformer 34 is installed in place of the two diodes D5 and D6. However, such a transformer 34 has a lower installation cost than the diodes D5 and D6 having a high breakdown voltage. Therefore, when the energy recovery device of the present invention is used, the manufacturing cost can be reduced.

It is a perspective view which shows the structure of the discharge cell of the conventional plasma display panel. It is a figure which shows the energy recovery apparatus formed in the scanning electrode Y in order to collect | recover a sustain discharge voltage. FIG. 3 is a timing diagram and a waveform diagram showing the on / off timing of each switch shown in FIG. 2 and the output waveform of the panel capacitor. It is a figure which shows the energy recovery apparatus which concerns on the Example of this invention. FIG. 5 is a timing diagram and a waveform diagram showing the on / off timing of each switch shown in FIG. 4 and the output waveform of the panel capacitor. It is a figure which shows the energy recovery apparatus which concerns on the other Example of this invention. FIG. 7 is a timing diagram and a waveform diagram showing the on / off timing of each switch shown in FIG. 6 and the output waveform of the panel capacitor.

Claims (17)

A capacitive load equivalently formed between the scan electrode and the sustain electrode;
An energy recovery unit for recovering energy charged in the capacitive load, and for re-supplying the recovered energy to the capacitive load;
It is installed between the energy recovery unit and the capacitive load, relays energy between the energy recovery unit and the capacitive load, and so that stable discharge can occur at the capacitive load. An energy supply for supplying a reference voltage to the capacitive load;
An energy recovery apparatus, comprising: an energy relay unit that is installed between the energy recovery unit and the energy supply unit and relays energy between the energy recovery unit and the energy supply unit .   The energy recovery unit stores energy recovered from the capacitive load, and re-supplyes the stored energy to the capacitive load, and between the source capacitor and the ground voltage source. The energy recovery device according to claim 1, further comprising: a first switching element that is turned on when the energy charged in the source capacitor is supplied to the energy relay unit.   The energy supply unit includes a second switching element connected to a reference voltage source for supplying the reference voltage, and third and fourth switching elements connected in parallel between the second switching element and the base voltage source. The energy recovery device according to claim 1, further comprising an element.   The energy recovery apparatus according to claim 1, wherein the energy relay unit includes a magnetically coupled inductor in which at least two coils are magnetically coupled.   The magnetically coupled inductor includes a first inductor installed between the first switching element and the source capacitor, a second inductor installed between the second switching element and the third switching element, The energy recovery device according to claim 4, further comprising:   4. The energy recovery apparatus according to claim 3, wherein the third switching element is turned on when the second inductor is charged using energy charged in the capacitive load.   The energy recovery apparatus according to claim 3, wherein the fourth switching element is turned on when a base potential is supplied to the capacitive load.   6. The energy recovery apparatus according to claim 5, wherein the coils of the first inductor and the second inductor are wound in the same direction.   6. The energy recovery apparatus according to claim 5, wherein the coils of the first inductor and the second inductor are wound in different directions. In an energy recovery method including a reference voltage source for supplying a reference voltage capable of generating a stable sustain discharge,
A first step of charging the first inductor of the magnetically coupled inductor using energy charged in the source capacitor;
A second stage in which energy is charged to a second inductor of the magnetically coupled inductor when the first inductor is charged with energy;
And a third step of supplying the energy charged in the second inductor to a capacitive load equivalently formed between the scan electrode and the sustain electrode.   11. The energy recovery method according to claim 10, wherein the energy charged in the second inductor is supplied to the capacitive load when the energy supplied to the first inductor is cut off.   The energy recovery method according to claim 10, wherein the energy charged in the second inductor is charged and supplied to the capacitive load.   The energy recovery method according to claim 10, wherein a reference voltage is charged to the capacitive load in the third stage.   11. The energy recovery method according to claim 10, further comprising a step of supplying a voltage value of the reference voltage source to the capacitive load for a predetermined time after the third step. The energy recovery method includes a fourth step of charging the second inductor using energy charged in the capacitive load;
A fifth stage in which the first inductor is charged with energy when the second inductor is charged with energy;
The energy recovery method according to claim 10, further comprising a sixth step of charging the source capacitor using energy charged in the first inductor.   The energy recovery method according to claim 15, wherein the energy charged in the first inductor is supplied to the source capacitor when the energy supplied to the second inductor is cut off.   The energy recovery method according to claim 15, wherein the energy charged in the first inductor is charged and supplied to the source capacitor.

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