KR20020061949A - Energy Recovery Device and Method for AC Plasma Display Panel - Google Patents

Abstract

PURPOSE: An energy recovery device of an AC type plasma display panel(PDP) and an energy recovery method using the same are provided, which improves an energy recovery efficiency and a driving characteristics of the AC type plasma display panel. CONSTITUTION: The energy recovery device of an AC type plasma display panel is constituted to recover a charge/discharge energy by being resonated with a panel capacitor of the plasma display panel. The energy recovery device includes a sustain driving unit(30) which is connected to a power supply part and is switched according to an external control signal and also supplies a sustain voltage to the panel capacitor to drive the display panel and also discharges its charging energy periodically. And an energy recovery unit comprises the first inductor(L1) arranged in a charging path of the panel capacitor and the second inductor arranged in a discharge path, and recovers a current energy stored in the first and the second inductor to the power supply part by being switched according to the external control signal after the charging/discharging operation of the panel capacitor.

Description

Energy recovery device of AC plasma display panel and energy recovery method using same {Energy Recovery Device and Method for AC Plasma Display Panel}

The present invention relates to an energy recovery device of a plasma display panel, and in particular, to change the configuration of the existing energy recovery device to reduce the number of circuit elements required and at the same time the energy recovery device of the AC type plasma display panel. And methods thereof.

In general, an AC plasma display panel (hereinafter, referred to as a "display panel") is a light emitting device that displays an image by exciting a phosphor formed in a discharge cell, which is a simple manufacturing process, easy to thin and large screen Due to its characteristics, the use of the display board of the stock exchange, video conferencing displays, and recently, image display apparatuses used for large screen TVs is increasing.

In addition, the display panel must continuously apply a high voltage equal to or higher than the discharge start voltage of the discharge gas between sustain electrodes (eg, the X electrode and the Y electrode) in the discharge cell during driving. In this case, a dielectric is coated on the sustain electrode, and thus, a certain amount of capacitance component (hereinafter, referred to as a panel capacitor) is present on the X electrode and the Y electrode, which are sustain electrodes of the display panel.

Therefore, the charging and discharging operation of the panel capacitor should be performed to alternately apply high voltages of the positive and negative electrodes between the sustain electrodes when the display panel is driven. However, the panel capacitor consumes a considerable amount of reactive power during charging and discharging, and the panel capacitor increases in proportion to the size of the display panel, thereby increasing its power consumption. .

Accordingly, the display panel applies an energy recovery device to the driving circuit to reduce the power loss generated during the charge / discharge operation of the panel capacitor to reduce the power of the driving circuit.

The energy recovery apparatus includes an inductor that forms an LC resonant circuit together with the panel capacitor of the display panel. The energy recovery apparatus recovers energy lost during discharge of the panel capacitor through the inductor and temporarily stores the stored current energy. It is a circuit for reducing the loss of reactive power generated when driving the display panel by using during the next charging operation.

That is, FIG. 1 shows a configuration of an energy recovery apparatus using a conventional external capacitor, which maintains and drives the display panel at a sustain voltage V _S and recovers energy lost during a discharge operation of the panel capacitor C _P. And first and second energy recovery units 10 and 20 for supplying the energy recovered during the next charging operation to the panel capacitor C _P , and the first and second energy recovery units 10 and 20. Are symmetrically configured with the panel capacitor C _P interposed therebetween.

And, the first and second energy recovery unit (10, 20) the panel capacitor both-end voltage (V _P), the state (+, -) of the charge-discharge operation when the panel capacitor (C _P) of the (C _P), the polarity of the Are alternately operated.

In FIG. 1, the first energy recovery unit 10 includes a control switch S1 for supplying a sustain voltage V _S to the panel capacitor C _P when the display panel is driven and the panel capacitor C _P. The control switch S2 connected between the panel capacitor C _P and the ground terminal to discharge to the ground potential (ground potential) during the discharging operation, and the inductor L1 that resonates during the charge / discharge operation of the panel capacitor C _P. And a backflow prevention diode (D15, D16) for preventing the reverse flow of the resonance current, an external capacitor (C1) for storing energy recovered during the resonance operation of the inductor (L1) and the panel capacitor (C _P ), and the panel A control switch S11, S12 is connected between the capacitor C _P and the external capacitor C1 to switch the energy recovery path.

In addition, in FIG. 1, the plurality of control switches S1, S2, S11, and S12 each include a field effect transistor (MOSFET) and an antiparallel diode, or an insulated gate bipolar transistor (IGBT). It is possible to use Insulated Gate Bipolar Transistor. In this embodiment, a control switch composed of a MOSFET and an antiparallel diode is used.

FIG. 2 illustrates voltage waveforms A and V of currents flowing through the inductor L1 at both ends of the panel capacitor C _P according to the switching operation of each control switch in the energy recovery device shown in FIG. 1.

First, the conventional energy recovery device of FIG. 1 is configured to reduce the loss due to reactive power generated by discharging the charge charge of the panel capacitor C _P again after the system power is applied and after the driving operation of the display panel. will be. Then, during the charge and discharge operation of the panel capacitor (C _P) it is achieved through energy transfer between the resonance operation panel capacitor (C _P) and the inductor (L1).

And, the operation of the energy recovery device is divided into four sections (T1 ~ T4) as shown in Figure 2, the operation of the second energy recovery unit 20 is described below the first energy recovery unit 10 ) Is done in the same way.

First, the charging energy of the panel capacitor C _P is stored in the external capacitor C1 through a resonance operation with the inductor L1.

Thereafter, the resonant current i1 of the inductor L1 and the panel capacitor C _P is formed from the external capacitor C1 in the first energy recovery unit 10, and the panel capacitor C is formed by the resonant current i1. _The voltage V _P at both ends of _P ) increases to the sustain voltage V _S as shown in FIG. 2A. At this time, the control switch S11 is driven on to provide the current path (T1 section).

Subsequently, the control switch S1 is driven on to maintain the display panel, and the sustain voltage V _S is continuously applied to the voltage V _P of both ends of the panel capacitor C _P.

Then, the charge energy of the first energy recovery unit (10, after maintaining the drive of the display panel, the panel capacitor is the resonance (C _P) and discharge operation when the inductor (L1) and the panel capacitor (C _P) of the panel capacitor (C _P) ) Is recovered to the external capacitor C1. At this time, the control switch S12 is driven to provide a current path (T3 section).

Thereafter, the control switch S2 is driven on, and the voltage V _P of both ends of the panel capacitor C _P maintains a zero potential. (T4 section)

At this time, the voltage V _P between both ends of the panel capacitor C _P in the T1 period is equal to the sustain voltage V _S. Equivalent to Going up to the to the holding voltage (V _S) by the resonance operation from the capacitor (C1) which is filled with an inductor (L1) and the panel capacitor (C _P), actually a line resistance and a circuit resistance component within the device to the panel ( Hereinafter, a loss Δ is generated due to the parasitic resistance, and the energy recovery efficiency and the driving characteristics of the panel are deteriorated according to the discharge phenomenon before the driving of the display panel.

In addition, the energy recovery device of the conventional display panel has a problem that the number of circuit elements required in the configuration of the energy recovery device is required more than necessary to increase the volume of the energy recovery device and increase the manufacturing cost.

Accordingly, the present invention has been made in view of the above circumstances, and a main object of the present invention is to provide an energy recovery apparatus for an AC plasma display panel which can improve energy recovery efficiency and driving characteristics of an AC plasma display panel.

In addition, another object of the present invention to provide an energy recovery device and method of the AC plasma display panel that can reduce the number of circuit elements required when configuring the energy recovery device of the display panel.

1 is a circuit diagram showing the configuration of an energy recovery device using a conventional external capacitor.

Figure 2 is a waveform diagram according to the switching drive of each control switch in the conventional energy recovery device of FIG.

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

4 is a waveform diagram for explaining a first embodiment of the present invention.

5 is a switching timing diagram of each control switch according to the first embodiment of the present invention;

6 is a circuit diagram showing the configuration of an energy recovery apparatus of an AC plasma display panel according to a second embodiment of the present invention;

7 is a waveform diagram for explaining a second embodiment of the present invention.

8 is a switching timing diagram of each control switch according to the second embodiment of the present invention;

FIG. 9 is a waveform diagram for explaining a third embodiment of the present invention having the configuration of FIG. 6; FIG.

10 is a timing diagram of each control switch according to the third embodiment of the present invention having the configuration shown in FIG. 6;

Fig. 11 is a circuit diagram showing the construction of an energy recovery apparatus for an AC plasma display panel according to a fourth embodiment of the present invention.

12 is a switching timing diagram of each control switch according to the fourth embodiment of the present invention.

13 is a switching timing diagram of each control switch according to the fifth embodiment of the present invention having the configuration shown in FIG.

Fig. 14 is a circuit diagram showing the construction of an energy recovery apparatus for an AC plasma display panel according to a sixth embodiment of the present invention.

15 is a timing diagram of each control switch according to the sixth embodiment of the present invention;

*** Explanation of symbols for the main parts of the drawing ***

10, 40, 70, 90: the first energy recovery unit,

20, 50, 80, 100: second energy recovery unit,

30: holding unit, 91: transformer,

S1 ~ S11: Control switch, D1 ~ D16: Diode,

C1: external capacitor, L1, L3: first inductor,

L2, L4: second inductor, C _P : panel capacitor,

L5: Primary magnetization inductance, L6: Secondary magnetization inductance.

An energy recovery device of an AC plasma display panel according to the present invention for achieving the above object is an energy recovery device configured to recover the charge and discharge energy by resonating with the panel capacitor of the plasma display panel, the energy recovery device is a power supply stage A sustain drive means for supplying a sustain voltage to the panel capacitor and periodically discharging the charged energy so as to be connected to the switch panel and switched according to an external control signal to maintain and drive the display panel, and a first path disposed in the charge path of the panel capacitor. An inductor and a second inductor disposed in the discharge path, and after charging and discharging of the panel capacitor, the second inductor is switched according to an external control signal to recover current energy stored in each of the first and second inductors to a power supply terminal. Characterized in that it comprises a recovery means.

In addition, the energy recovery device of the AC plasma display panel for achieving the object of the present invention is resonant with the panel capacitor of the plasma display panel configured to recover the charge and discharge energy, the energy recovery device is a power supply stage A sustain driving means for supplying a sustain voltage to the panel capacitor so as to maintain the display panel and being switched according to an external control signal and periodically discharging the charging energy; and connected to one side of the panel capacitor. A first inductor for providing a charging path at a positive polarity and a discharge path at a negative polarity thereof, and is switched according to an external control signal after the charging operation of the panel capacitor to recover current energy stored in the first inductor to a power supply terminal. A first energy recovery means, and A second inductor connected to the other side of a null capacitor to provide a charging path at a positive polarity of the panel capacitor and a charging path at a negative polarity of the panel capacitor, and is switched according to an external control signal after the charging operation of the panel capacitor to be connected to the second inductor. It characterized in that it comprises a second energy recovery means for recovering the stored current energy to the power supply stage.

In addition, the energy recovery device of the AC plasma display panel for achieving the object of the present invention is resonant with the panel capacitor of the plasma display panel configured to recover the charge and discharge energy, the energy recovery device is a power supply stage A sustain driving means for supplying a sustain voltage to the panel capacitor and periodically discharging the charging energy so that the display panel is driven and switched according to an external control signal, and symmetrically connected between both ends of the panel capacitor. A transformer disposed in the charge / discharge path of the panel capacitor, and after charging and discharging operations of the panel capacitor, respectively, are switched according to external control signals to supply current energy induced in the secondary magnetization inductance from the primary magnetization inductance of the transformer. Supply stage Including first and second energy recovery means for recovering a characterized in that configured.

In addition, the energy recovery method of the AC plasma display panel to achieve the object of the present invention is connected to the energy recovery means on one side of the panel capacitor of the display panel and the energy recovery method through the first and second inductor resonating with the panel capacitor The method according to claim 1, wherein the current energy stored in the first inductor charges the panel capacitor to a positive sustain voltage, and a second step in which the display panel is driven by a sustain voltage applied through a power supply terminal. A third step of storing current energy in the second inductor during the discharging operation of the panel capacitor, a fourth step in which the current energy stored in the second inductor forms a short-circuit loop to maintain the amount of current, and the second step A fifth step of charging the panel capacitor to a negative sustain voltage by the current energy stored in the inductor; A sixth step of holding and driving the display panel by a sustain voltage applied through a supply terminal; a seventh step of storing current energy in the first inductor during a discharge operation of the panel capacitor; and a current stored in the first inductor. And an eighth step in which the energy forms a short loop and the amount of current is maintained.

In addition, the energy recovery method of the AC plasma display panel to achieve the object of the present invention in the energy recovery method through the inductor resonant after the discharge operation of the panel capacitor in the display panel, the energy applied to the sustain voltage applied through the power supply terminal And a second step in which the display panel is driven and maintained, a second step in which the inductor is resonated during the discharging operation of the panel capacitor to store the resonance current as current energy, and the current energy stored in the inductor forms a short-circuit loop. And a fourth step of maintaining a current amount, and a fourth step of charging the panel capacitor to a sustain voltage by the resonance energy of the current energy stored in the inductor.

Therefore, according to the above configuration, after the charging and discharging operation of the panel capacitor, the energy recovery path is set as the power supply stage, so that the energy recovery efficiency can be improved.

According to the above steps, after the discharging operation of the panel capacitor is completed, the resonant current flowing along the discharge path is stored in the inductor and circulated through the short-circuit loop, and the energy is recovered by using it during the next charging operation of the panel capacitor. The efficiency can be improved.

In addition, according to the above configuration and step, the energy recovery device which is provided symmetrically with the holding driving part in the construction of the energy recovery device of the AC type plasma display panel is provided only on one side of the holding driving part, which is required in the configuration of the energy recovery device. The number of circuit elements can be reduced.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

<First Embodiment>

3 shows a configuration of an energy recovery apparatus of an AC plasma display panel according to a first embodiment of the present invention.

See in Figure 3 number 30 is a sustain driver for supplying a predetermined sustain voltage to the panel capacitor (C _P) of the display panel, which supply respectively to supply the sustain voltage (V _S) to the panel capacitor (C _P) of the display panel The panel capacitors (C1) and the control switches (S1, S3) connected in common between the supply terminal (1) and the panel capacitor (C _P ) and the panel capacitor (C _P ) are discharged to the base potential (ground potential), respectively. C _P ) and control switches S2 and S4 connected in common.

At this time, when the control switch (S1, S4) or the control switch (S2, S3) is turned on, the sustain voltage of the positive (+,-) is applied to the panel capacitor (C _P ), respectively.

That is, in the case where the control switches S1 and S4 are turned on in FIG. 3, when the voltage V _P of both ends of the panel capacitor C _P is positive (+), the control switches S2 and S3 are turned on. Both ends of the voltage V _P are negatively applied to the sustain electrodes (X electrode and Y electrode) in a negative polarity to drive the display panel.

In FIG. 3, reference numeral 40 is connected to the holding driver 30 to independently arrange the first inductor L1 and the second inductor L2 in the charge path and the discharge path of the panel capacitor C _P , respectively. After charging the panel capacitor C _P to a sustain voltage through the resonance operation with the first inductor L1 and performing the charging and discharging operation of the panel capacitor C _P , respectively, the first inductor L1 is performed. ) And a first energy recovery unit for recovering the current energy stored in the second inductor (L2) to the power supply stage 1, 50 is shown as a block in Figure 3, the first energy recovery unit ( 10) and the second energy recovery unit symmetrically configured with the panel capacitor C _P interposed therebetween.

In FIG. 3, one end of the first inductor L1 is connected to the panel capacitor C _P , and the other end thereof is supplied with power through the diode D1 and the control switch S5. It is connected to stage 1 to provide a charging path of the panel capacitor C _P.

In FIG. 3, the other end of the first inductor L1 is grounded through a diode D2 having a cathode connected to the connection node b, and one end of the first inductor L1 is connected to the connection node a. The panel capacitor C _P is charged to the holding voltage after being connected to the power supply terminal 1 through S1, and when the anti-parallel diode of the control switch S1 conducts, current energy stored in the first inductor L1. It provides a path for recovering to the power supply stage (1).

In FIG. 3, one end of the second inductor L2 is connected to one end of the panel capacitor C _P , and the other end of the second inductor L2 is connected to the connection node c. discharge path is a current path for the anode is formed is connected to a diode (D4) and the anti-parallel diode of the control switch (S6) and the control switch (S4) connected to the other end of the panel capacitor (C _P) the panel capacitor (C _P) To provide.

3, one end of the second inductor L2 is grounded through the control switch S2 connected to the connection node a, and the other end of the second inductor L2 is connected to the connection node c. It is connected to the power supply terminal 1 through the diode D3 to provide a path for recovering the current energy stored in the second inductor L2 to the power supply terminal 1 after the discharging operation of the panel capacitor C _P. do.

In FIG. 3, the plurality of backflow prevention diodes D1 to D4 and the plurality of control switches S1 to S6 in the first energy recovery unit 40 are panel capacitors C _P and the first or second inductors L1, In the charging / discharging operation according to the resonance operation between L2), the charging path and the discharge path of the panel capacitor C _P and the energy recovery path to the power supply terminal 1 are provided.

Hereinafter, a first embodiment of the present invention having the configuration of FIG. 3 will be described with reference to FIGS. 4 and 5.

FIG. 4 shows the voltage waveforms A at both ends of the panel capacitor C _P and the first and second inductors L1 and L2 according to the switching driving of each control switch S1 to S6 in the energy recovery device shown in FIG. 3. Are the current waveforms (B, C) flowing through

5 shows the switching timing of each of the control switches S1 to S6.

At this time, the operation of the first energy recovery unit 40 is divided into five sections (T1 ~ T5) as shown in Figures 4 and 5, the operation of the second energy recovery unit 50 is It is done in the same way.

That is, the T1 section is a section in which the panel capacitor C _P is charged with the sustain voltage. In this case, only the control switches S4 and S5 are driven on, and the remaining control switches remain off.

Therefore, according to the current path of the control switch (S5)-> diode (D1)-> first inductor (L1)-> panel capacitor (C _P )-> control switch (S4), the panel capacitor (C _P ) is the first Resonant with inductor L1 When the resonance period is reached, the voltage V _P across the panel capacitor C _P reaches the holding voltage V _S.

At this time, the voltage between both ends of the panel capacitor (C _P ) (V _P ) Due to the nature of resonance, ascending to a steep slope as shown in FIG.

Therefore, the panel capacitor (C _P) across the voltage (V _P) of the panel capacitor (C _P) by the power loss due to the parasitic resistance of the display panel when the charging operation is possible to prevent the holding voltage V _S that can not be reached, a problem with to Will be.

When the voltage V _P of both ends of the panel capacitor C _P reaches the holding voltage in the T1 section, the anti-parallel diode of the control switch S1 becomes conductive when the potential difference between both ends becomes zero.

The T2 section and the T3 section are sections in which the sustain voltage is continuously applied to the panel capacitor C _{P. In} this case, only the control switches S1 and S4 are driven on, and the remaining control switches are kept off.

Accordingly, when the control switch S1 is turned on in the T2 section, since the antiparallel diode of the control switch S1 is in a conductive state, power loss due to the switching operation can be reduced.

In addition, the current i1 flowing through the first inductor L1 in the T2 section is controlled by the diode D2-> first inductor L1-> control switch as the anti-parallel diode of the control switch S1 conducts. The current i1 recovered through the inductor L1 through the current path of the anti-parallel diode of S1 and flowing through the inductor L1 is linearly attenuated as shown in FIG.

In the T4 section, the discharge current of the panel capacitor C _P is stored as current energy through the second inductor L2 resonating therewith. In this case, only the control switches S4 and S6 are driven on. The remaining control switches remain off.

Therefore, the second inductor L2-> diode D4-> control switch S6-> anti-parallel diode of the control switch S4-> the second inductor L2 along the current path of the panel capacitor C _P. ), The charging energy of the panel capacitor C _P is stored as current energy.

At this time, the voltage V _P between both ends of the panel capacitor C _P is sineically lowered as shown in FIG. 4A.

In addition, the resonance operation between the second inductor L2 and the panel capacitor C _P is performed in the T4 section. When the cycle is reached, since the potential between both ends of the panel capacitor C _P becomes zero, the antiparallel diode of the control switch S2 is brought into a conductive state.

The section T5 is a section for recovering the current energy stored in the second inductor L2 to the power supply terminal 1, in which case all the control switches S1 to S6 are turned off.

Therefore, the current energy stored in the second inductor L2 is recovered to the power supply terminal 1 along the current path of the antiparallel diode-> second inductor L2-> diode D3 of the control switch S2. .

At this time, the current flowing through the second inductor L2 is linearly attenuated as shown in FIG. 4C, and the voltage V _P between both ends of the panel capacitor C _P maintains a zero potential.

Thereafter, in FIG. 3, the second energy recovery unit 50 connected to the sustain driving unit 30 applies a negative polarity sustain pulse to the display panel in the same manner as described above, and the operation is performed by the display panel. According to the charging and discharging operation is made repeatedly.

Second Embodiment

6 shows a configuration of an energy recovery device of an AC plasma display panel according to a second embodiment of the present invention, which performs the same operation as the first embodiment and symmetrically provides an energy recovery unit. The switching method of the control switch is changed when the positive (+,-) polarity of the panel capacitor (C _P ) is switched to reduce the number of collecting parts.

The same components as those shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The energy recovery apparatus of FIG. 6 includes a holding drive unit 30 and an energy recovery unit 60 connected to the panel capacitor C _{P in} the holding drive unit 30.

The energy recovery unit 60 of FIG. 6 has the same circuit configuration as the first energy recovery unit 40 of FIG. 3, and performs the same energy recovery operation during the charge / discharge operation of the panel capacitor C _P.

However, when the polarity of the panel capacitor C _P is changed from the positive polarity to the negative polarity, that is, when the voltage V _P of both ends of the panel capacitor C _P is charged to -V _S Supply stage (1)-> control switch (S3)-> panel capacitor (C _P )-> second inductor (L2)-> diode (D4)-> control switch (S6) to form a charging path S3 and S6 are driven on.

For energy recovery system of Figure 3 the first and second energy recovery unit (40 and 50) are constructed symmetrically with the panel capacitor (C _P) in the both-end voltage V _S (V _P) is positive (+) polarity of the When charged, the charging operation is performed through the first energy recovery unit 40, and when charged with negative polarity -V _S , the charging operation is performed through the second energy recovery unit 50.

That is, in FIG. 3, the charging operation of the panel capacitor C _P through the first energy recovery unit 40 is performed in the power supply stage 1-> control switch S5-> diode D1-> first inductor ( L1)-> panel capacitor (C _P )-> control switch (S4) is made through the charging path, the second energy recovery unit 50 has a configuration symmetrical with the first energy recovery unit 40 Thus, in the same manner, the negative polarity is charged to -V _S.

In the present embodiment, the energy recovery path from the positive polarity of the panel capacitor C _P to the power supply terminal 1 is the same as that of the first embodiment, and the power supply terminal is negative in the negative polarity. The energy recovery path to 1) is formed in the inverse manner to the first embodiment.

That is, after the charging operation is performed at the negative polarity of the panel capacitor C _P , the energy recovery of the anti-parallel diode-> second inductor L2-> diode D3 of the control switch S2 is shown in FIG. 6. After the furnace is formed and the discharge operation is performed in the negative polarity, an energy recovery path of the antiparallel diode of the diode D2-> first inductor L1-> control switch 1 is formed.

Hereinafter, a second embodiment of the present invention having the configuration of FIG. 6 will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 shows voltage waveforms D at both ends of the panel capacitor C _P and the first and second inductors L1 and L2 according to the switching operation of each control switch S1 to S6 in the energy recovery device shown in FIG. 6. Are the current waveforms (E, F) flowing through

8 shows the switching timing of each control switch S1 to S6.

At this time, the energy recovery unit 50 is divided into 10 sections (T1 ~ T10) to operate.

In FIG. 7, the T1 section is a section in which the voltage V _P at both ends of the panel capacitor C _P is maintained at negative -V _S when the display panel is maintained. In this case, the control switches S2 and S3. It is only driven on, and the remaining control switches remain off.

In the T2 section, the discharge current of the panel capacitor C _P is stored as current energy in the first inductor L1 through resonant operation with the first inductor L1. In this case, the control switches S3 and S5. ) Will be driven on, and the rest of the control switches will remain disconnected.

Accordingly, a current path of the panel capacitor C _P- > antiparallel diode-> control switch S5-> diode D1-> first inductor L1 of the control switch S3 is formed, and the first inductor is formed. L1 stores the discharge current of the panel capacitor C _P as current energy.

In this case, the voltage across the panel capacitor C _P (V _P ) When the resonance period is reached, the zero potential is reached as shown in FIG. 7D, and the resonance current i1 is sineously increased as shown in FIG. 7E.

At this time, when the voltage V _P of both ends of the panel capacitor C _P reaches zero potential, the anti-parallel diode of the control switch S1 is in a conductive state.

That is, the loop formed by the control switch S1-> panel capacitor C _P- > control switch S3 of FIG. 6 as soon as the voltage V _P of both ends of the panel capacitor C _P reaches zero potential. Becomes zero potential, whereby the anti-parallel diode of the control switch S1 is brought into a conductive state.

In FIG. 7, a section T3 is a section for recovering the current energy stored in the first inductor L1 to the power supply terminal 1, in which case all the control switches S1 to S6 are turned off.

Therefore, the current energy stored in the first inductor L1 is recovered to the power supply terminal 1 through the current path of the antiparallel diode of the diode D2-> first inductor L1-> control switch S1. .

In FIG. 7, the section T4 is formed by the first inductor L1 and the panel capacitor C _P. The panel capacitor C _P is charged to the positive polarity holding voltage through the resonant operation, and the T5 and T6 sections are sections in which the sustain voltage is continuously applied to the panel capacitor C _P.

In addition, in FIG. 7, the section T7 indicates the discharge current during the discharging operation of the panel capacitor C _P. A section for storing the current energy in the resonant second inductor L2 is a section, and a section T8 is a section for recovering the current energy stored in the second inductor L2 to the power supply terminal 1.

In FIG. 7, operations of the T4 to T8 sections are the same as the T1 to T5 sections (FIGS. 4 and 5) of the first embodiment, and thus a detailed description thereof will be omitted.

In the period T9 of FIG. 7, the second inductor L2 and the panel capacitor C _{P are} formed. The panel capacitor C _P is charged to the negative polarity holding voltage through the resonance operation. In this case, only the control switches S3 and S6 are driven on, and the remaining control switches remain off.

Therefore, the charging path of the power supply stage 1-> control switch S3-> panel capacitor C _P- > second inductor L2-> diode D4-> control switch S6 is Is formed. At this time, the voltage V _P between both ends of the panel capacitor C _P reaches the holding voltage with a steep slope as shown in FIG. 7D, and the resonance current i2 is sinusoidal as shown in FIG. 7F. The enemy will rise.

Then, the anti-parallel diode of the control switch S3 is switched to the conduction state when the voltage V _P of both ends of the panel capacitor C _P reaches the sustain voltage, and then the control switch S3 during the sustain operation of the T10 section. The power loss due to the switching operation can be reduced.

In FIG. 7, the T10 section is a section in which the display panel is maintained and driven. In this case, only the control switches S2 and S3 are driven on, and the remaining control switches are kept off.

In addition, the current energy stored in the second inductor L2 in the T10 section is supplied through the current path of the anti-parallel diode-> second inductor L2-> diode D3 of the control switch S2 of FIG. Recovered to stage (1).

Therefore, the current i2 flowing through the second inductor L2 is linearly attenuated as shown in FIG. 7F.

In addition, the above-described operation of the sections T1 to T10 is repeatedly performed according to the charge / discharge operation of the display panel.

That is, according to the second embodiment, the charging operation of the panel capacitor C _P is performed. As the voltage rise slope rapidly increases due to resonance, driving characteristics of the display panel can be improved. In addition, it is possible to significantly reduce the number of elements while performing the same function as the first embodiment described above.

Third Embodiment

The third embodiment of the present invention uses the circuit configuration of the second embodiment shown in FIG. 6, and in the second embodiment, current energy stored in the first and second inductors L1 and L2 is supplied to the power supply stage. The switching method of the control switch is changed to self oscillating in the energy recovery device.

The same components as those shown in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, in FIG. 6, the magnetic vibration path of the current energy stored in the first inductor L1 is the antiparallel diode of the first inductor L1-> control switch S1-> control switch S5-> diode D1. The magnetic vibration path of the current energy provided through the first loop formed in the second inductor L2 and stored in the second inductor L2-> diode D4-> control switch S6-> control switch ( The antiparallel diode of S2) is provided through a second loop that forms.

In addition, the current energy of the first inductor L1 held through the first loop is used to charge the panel capacitor C _p with a positive polarity, and the second inductor held through the second loop ( The current energy of L2) is used to charge the panel capacitor C _p with negative polarity.

Hereinafter, a third embodiment of the present invention having the configuration of FIG. 6 will be described with reference to FIGS. 9 and 10.

FIG. 9 shows voltage waveforms G at both ends of the panel capacitor C _P and the first and second inductors L1 and L2 in the energy recovery apparatus shown in FIG. 6 according to the switching operation of each control switch S1 to S6. Are the current waveforms (H, I) flowing through

10 shows the switching timing of each control switch S1 to S6.

The T1 section is a section in which the display panel is maintained in a negative polarity. In this case, only the control switches S2 and S3 are driven on and the remaining control switches are turned off as shown in FIG. 10.

Therefore, the voltage V _P across the panel capacitor C _p is maintained at −V _S as shown in FIG. 9G.

The T2 section is a section in which current energy is stored in the first inductor L1 by resonating with the first inductor L1 during the discharge operation of the panel capacitor C _p . In this case, only the control switches S3 and S5 are driven on. The remaining control switches remain off.

In this case, even when the control switch S3 is turned off, current flows through the antiparallel diode of the control switch S3. However, since the control switch S3 is driven on in the T1 section, the control switch S3 is continuously driven to prevent the power loss due to the switching operation.

In addition, when the current flows through the antiparallel diode of the control switch, driving the control switch on smoothly flows the current.

Hereinafter, even when the antiparallel diode of the control switch is turned on and driven on, the current path is indicated as the antiparallel diode of the control switch for convenience of description.

That is, in the T2 period, the resonance current i1 at the resonance of the panel capacitor C _p and the first inductor L1 is the inverse parallel diode-> control switch of the panel capacitor C _p- > control switch S3. S5)-> Diode (D1)-> flows along the current path of the first inductor (L1), the current energy is stored in the first inductor (L1).

As the current energy is stored in the first inductor L1, the resonant current i1 of the first inductor L1 increases sine as shown in FIG. 9H, and the panel capacitor C _p . The voltage at both ends of V _P is gradually decreased by the discharging operation to reach zero potential.

At this time, when the voltage V _P of both ends of the panel capacitor C _p reaches zero potential, the anti-parallel diode of the control switch S1 is switched to the conduction state.

The T3 section is a section in which the resonant current i1 of the first inductor L1 is maintained. In this case, only the control switch S5 is driven on and the remaining control switches remain off.

Accordingly, the resonant current i1 of the first inductor L1 is formed by the anti-parallel diode-> control switch S5-> diode D1 of the first inductor L1-> control switch S1 of FIG. Flows along the short-circuit loop, and the current amount is maintained as shown in FIG.

That is, in the second embodiment, the current energy stored in the first inductor L1 is recovered to the power supply stage 1, but in the present embodiment, the energy i1 flowing through the first inductor L1 is recovered. Magnetic vibration in the device.

In FIG. 9, the T4 section is a section in which the current energy stored in the first inductor L1 charges the panel capacitor C _p by the resonance operation of the panel capacitor C _p and the first inductor L1. Only the switch S4 is driven on and the other control switch is kept off.

That is, in the period T4, the resonance current i1 of the panel capacitor C _p and the first inductor L1 is determined by the first inductor L1-> panel capacitor C _p- > control switch S4-> diode. The current path of D2 is formed, and the current energy stored in the first inductor L1 charges the panel capacitor C _p to the sustain voltage V _S.

Accordingly, the voltage V _P across the panel capacitor C _p is increased sine to the sustain voltage as shown in FIG. 9G, and the polarity of the panel capacitor C _p is shown in FIG. 6. The polarity is reversed. At this time, the resonant current i1 is reduced sinusoidally as shown in FIG.

The T5 section is a section in which the display panel is maintained and driven. In this case, only the control switches S1 and S4 are driven on and the other control switches remain off, as shown in FIG. 5. Therefore, the voltage V _P across the panel capacitor C _p is maintained at V _S as shown in FIG. 9G.

On the other hand, as the terminal voltage V _P of the panel capacitor C _p reaches the sustain voltage in the T4 section, the anti-parallel diode of the control switch S1 becomes conductive. Therefore, in the T5 section, the control switch S1 can reduce the power loss due to the switching operation during the on driving.

The T6 section is a section in which current energy is stored in the second inductor L2 by resonating with the second inductor L2 during the discharge operation of the panel capacitor C _p . In this case, only the control switches S4 and S6 are driven on. The remaining control switches remain off.

That is, in the period T6, the resonant current i2 is the panel capacitor C _p- > second inductor L2-> diode D4-> control switch S6-> control switch S4 of FIG. A current path of the antiparallel diode is formed, and current energy is stored in the second inductor L2.

In addition, the resonant current i2 of the second inductor L2 is sineously increased as shown in FIG. 9I, and the voltage V _P between both ends of the panel capacitor C _p gradually increases due to the discharge operation. It decreases and reaches zero potential.

At this time, when the voltage V _P of both ends of the panel capacitor C _p reaches zero potential, the antiparallel diode of the control switch S2 is switched to the conduction state.

The T7 section is a section in which the resonant current i2 of the second inductor L2 is maintained. In this case, only the control switch S6 is driven on and the other control switches are kept off.

Therefore, in FIG. 6, the resonant current i2 forms a short loop having the path of the antiparallel diode of the second inductor L2-> diode D4-> control switch S6-> control switch S2. The amount of current is maintained as shown in Fig. 9I.

The T8 section is a section in which the current energy stored in the second inductor L2 charges the panel capacitor C _p by the resonance operation. In this case, only the control switch S3 is driven on and the remaining control switches remain off. do.

Therefore, the resonance current i2 flows along the current path of the second inductor L2-> diode D3-> control switch S3-> panel capacitor C _{p in} FIG. The current energy stored in L2) charges the panel capacitor C _p to the holding voltage -V _S.

In addition, the voltage V _P between both ends of the panel capacitor C _p is increased sine as shown in FIG. 9G, and the polarity of the panel capacitor C _p is opposite to the polarity shown in FIG. 6. Will have At this time, the resonance current i2 gradually decreases as shown in FIG. 9 (I).

The T9 section is a section in which the display panel is driven and maintained, and performs the same operation as the above-described T1 section. The energy recovery apparatus repeats the above operation to perform the energy recovery operation.

Fourth Example

FIG. 11 shows a configuration of an energy recovery device of an AC plasma display panel according to a fourth embodiment of the present invention. The same components as those shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. Shall be.

For convenience of description, an embodiment of the present invention will be described by inverting the positive and negative polarities of the voltage V _P between both ends of the panel capacitor C _P.

That is, reference numerals 11 to 70 are maintained driver 30 is connected to the panel capacitor (C _P) of the positive (+) after the charging operation of the charging path and the panel capacitor (C _P) in polarity, the power supply stage (1 ) Is a first energy recovery unit having a first inductor (L3) for providing an energy recovery path.

Reference numeral 80 is the first energy recovery unit 70 and are symmetrically connected to the sustain driver 30 the panel capacitor (C _P) in the sub-charging operation of the polarized charge path and the panel capacitor (C _P) in the () The second energy recovery section is provided with a second inductor L4 for providing an energy recovery path to the power supply stage 1.

After the discharge operation is performed at the positive polarity of the panel capacitor C _P , the energy recovery path to the power supply terminal 1 is the second inductor L4 in the second energy recovery unit 80. After the discharge operation is performed in the negative polarity, the energy recovery path to the power supply stage 1 is provided by the first inductor L3 in the first energy recovery unit 70.

That is, in FIG. 11, one end of the first inductor L3 is connected to the panel capacitor C _P , and the other end of the first energy recovery unit 70 is connected through the diode D6 and the control switch S7. It is connected to the ground terminal to provide the charging path of the panel capacitor C _P at the positive polarity during the on-drive of the control switches S3 and S7.

One end of the first inductor L3 is connected to the panel capacitor C _P , and the other end thereof is connected to the power supply terminal 1 through the diode D5. After the charging operation of the panel capacitor C _P at the positive polarity, the antiparallel diode of the control switch S2 is turned on to recover the current energy stored in the first inductor L3 to the power supply terminal 1. do.

In addition, one end of the second inductor L4 is connected to the panel capacitor C _P , and the other end thereof is connected to the power supply terminal 1 through the diode D7. After the discharge operation of the panel capacitor C _P at the positive polarity, the anti-parallel diode of the control switch S4 is turned on to recover the current energy stored in the second inductor L4 to the power supply terminal 1. do.

Then, the panel capacitor (C _P), part of (-) polarity in the panel capacitor (C _P), an energy recovery path to the charge path and the power supply stage (1) symmetrically with the one path and the second energy recovery unit ( 80) and the first energy recovery unit 70.

Hereinafter, a fourth embodiment of the present invention having the configuration of FIG. 11 will be described with reference to FIGS. 4 and 12.

12 shows the switching timing of each of the control switches S1 to S4, S7 and S8, and shows voltages at both ends of the panel capacitor C _P and currents flowing through the first and second inductors L3 and L4. The waveform is the same as the waveform of FIG. 4.

That is, in FIG. 12, the section T1 is a section in which the panel capacitor C _P is charged with a positive polarity holding voltage. In this case, only the control switches S3 and S7 are driven on, and the remaining control switches are turned off. Will be maintained.

Therefore, at this time, the first inductor L3 of FIG. 11 resonates with the panel capacitor C _P. When the resonance period is reached, the voltage V _P between both ends of the panel capacitor C _P reaches the holding voltage.

In addition, the slope of the voltage rise of the panel capacitor C _P increases with a steep slope as shown in FIG. 4A.

Therefore, it is possible to prevent the problem that the voltage V _P between both ends of the panel capacitor C _P does not reach the holding voltage due to the power loss caused by the parasitic resistance of the panel.

On the other hand, when the voltage V _P of both ends of the panel capacitor C _P reaches the holding voltage at the positive polarity, the antiparallel diode of the control switch S2 is brought into a conductive state with the potential difference between both ends being zero potential.

The sections T2 and T3 are sections in which the panel capacitor C _P is maintained and driven. In this case, only the control switches S2 and S3 are driven on, and the remaining control switches remain off.

Therefore, it is possible to reduce the power loss due to the switching operation of the control switch (S2) in the T2 section.

In addition, the current i1 flowing through the first inductor L3 in the T2 section is supplied through the current path of the anti-parallel diode-> first inductor L3-> diode D5 of the control switch S2. The current i1 recovered through the stage 1 and flowing through the first inductor L3 is linearly attenuated as shown in FIG. 4B.

The period T4 is a period for storing current energy through the second inductor L2 resonating with the discharge of the panel capacitor C _P. In this case, only the control switches S2 and S8 are driven on, and the other control switches are turned off. State is maintained.

Accordingly, the current path of the antiparallel diode of the panel capacitor C _P- > second inductor L4-> diode D8-> control switch S8-> control switch S2 is formed, and the second inductor is formed. L4 stores the discharge current of the panel capacitor C _P as current energy.

When the discharge of the panel capacitor C _P is terminated in the T4 section, the voltage V _P between both ends of the panel capacitor C _P becomes 0, so that the anti-parallel diode of the control switch S 4 becomes conductive.

The section T5 is a section for recovering the current energy stored in the second inductor L4 to the power supply stage 1, in which case only the control switch S4 is driven on and the remaining control switches are turned off.

Accordingly, the current energy stored in the second inductor L2 is recovered to the power supply terminal 1 along the current path of the antiparallel diode-> second inductor L4-> diode D7 of the control switch S4. .

Subsequently, the energy recovery operation at the negative polarity of the panel capacitor C _P is symmetrically performed by the second energy recovery unit 80 and the first energy recovery unit 70 in the above-described manner, which is a display. It is repeatedly performed in accordance with the charge / discharge operation of the panel.

Fifth Embodiment

The fifth embodiment of the present invention uses the same circuit configuration as that of the fourth embodiment (Fig. 11), and the energy recovery method to the power supply stage 1 of the fourth embodiment is self-vibrated in the energy recovery apparatus. The switching method of each control switch (S1 to S4, S7, and S8) is changed in order to change.

Incidentally, the same components as those shown in Fig. 11 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, in FIG. 11, when both the polarities of the panel capacitor C _P are discharged in the negative polarity, the current energy stored in the first inductor L3 is self-vibrated. In this case, the magnetic vibration path is provided through a first loop formed by the anti-parallel diode of the first inductor L3-> diode D6-> control switch S7-> control switch S2.

When the polarity of both ends of the panel capacitor C _P is discharged from the positive polarity, the current energy stored in the second inductor L4 is self-vibrated, and the magnetic vibration path is the second inductor L4-> diode. (D8)-> control switch (S8)-> is provided through a second loop formed by the anti-parallel diode of the control switch (S4).

In addition, the current energy of the first inductor L3 held through the first loop is used to charge the panel capacitor C _P with a positive polarity, and the second inductor held through the second loop ( The current energy of L4) is used to charge the panel capacitor C _P with a negative polarity.

Hereinafter, a fifth embodiment of the present invention having the configuration of FIG. 11 will be described with reference to FIGS. 9 and 13. FIG.

13 shows switching timings of the control switches S1 to S4, S7 and S8, and shows voltages at both ends of the panel capacitor C _P and currents flowing through the first and second inductors L3 and L4. The waveform is the same as that of FIG.

That is, in FIG. 9 and FIG. 13, the T1 section is a section in which the display panel is maintained in a negative polarity (control switches S1 and S4 are on-driven), and the T2 section is resonance when the panel capacitor C _P is discharged. It is a section in which the current energy is stored in the first inductor L3 (operation of the control switches S4 and S7 on).

Accordingly, the resonance current i1 through the first inductor L3 in the T2 section is the panel capacitor C _P- > first inductor L3-> diode D6-> control switch S4 of FIG. 12. Flows along the current path of the anti-parallel diode, and the current energy is stored in the first inductor L3.

When the voltage V _P across the panel capacitor C _P reaches zero potential, the antiparallel diode of the control switch S2 is turned on.

The T3 section is a section in which the current energy stored in the first inductor L3 vibrates (on the control switch S7). The current i1 flowing through the first inductor L3 is the first inductor (FIG. 12). L3)-> diode D6-> control switch S7-> control switch S2 forms a short-circuit loop of the anti-parallel diode.

The T4 section is a section in which the current energy stored in the first inductor L3 charges the panel capacitor C _P with positive (+) polarity through the resonant operation (control switch S3 on-driving). a first inductor (L3) - is thereby charged up to the sustain voltage> the panel capacitor panel capacitor (C _P) along a current path _(P C) -> diode (D5) -> control switch (S3).

The T5 section is a section in which the display panel is maintained with positive polarity (drives the control switches S2 and S3 on), and the T6 section is a second inductor L4 through a resonance operation when the panel capacitor C _P is discharged. ) Is the section in which current energy is stored (control switches (S2, S8) on driving).

That is, in the T6 section, the resonant current i2 through the second inductor L4 is the panel capacitor C _P- > second inductor L4-> diode D8-> control switch S8 of FIG. 12. The current path of the anti-parallel diode of the control switch S2 flows, and the current energy is stored in the second inductor L4.

When the voltage V _P between both ends of the panel capacitor C _P reaches zero potential, the antiparallel diode of the control switch S4 is turned on.

The T7 section is a section in which the current energy stored in the second inductor L4 is self-vibrated (control switch S8 on driving). Accordingly, the current i2 flowing through the second inductor L4 forms a short loop of the antiparallel diode of the second inductor L4-> diode D8-> control switch S4 of FIG.

The T8 section is a section in which the second inductor L4 and the panel capacitor C _P resonate to charge the panel capacitor C _P with negative polarity (control switch S1 on-driving). ) Charges the panel capacitor C _P to the sustain voltage through the current path of the second inductor L4-> diode D7-> control switch S1-> panel capacitor C _P.

The T9 section is the same as the T1 section, and then the operation of the energy recovery apparatus is repeatedly performed according to the above-described process.

Sixth Example

FIG. 14 shows the configuration of an energy recovery apparatus of an AC plasma display panel according to a sixth embodiment of the present invention.

The same components as those shown in FIG. 3 are given the same reference numerals, and detailed description thereof will be omitted.

In FIG. 14, reference numeral 90 denotes a transformer 91 connected to the holding driver 30 to charge / discharge a path of the panel capacitor C _P , and magnetizing the primary side magnetization inductance of the transformer 91. After the inductance L5 and the panel capacitor C _P are resonated, the panel capacitor C _P is charged to a sustain voltage and the panel capacitor C _P is charged / discharged. It is a first energy recovery unit for storing the current energy in the primary magnetization inductance (L5) of the) and recover the induced current generated in the secondary magnetization inductance (L6) of the transformer to the power supply stage (1). .

The reference numeral 100 is shown as a block in FIG. 14, but is a second energy recovery unit symmetrically disposed between the first energy recovery unit 90 and the panel capacitor C _P.

In FIG. 14, the first energy recovery unit 90 controls the diode D9 having one end of the primary magnetization inductance L5 of the transformer 91 connected to the panel capacitor C _P and the other end thereof connected in series. It is connected to the power supply terminal 1 via a switch S9 to provide a charging path of the panel capacitor C _P.

One end of the secondary magnetization inductance L6 of the transformer 91 is grounded through the diode D12, and the other end thereof is connected to the power supply terminal 1 through the diode D13, thereby providing a panel capacitor C _P. After the charging operation, the energy recovery path to the power supply stage 1 is provided.

In addition, the other end of the secondary magnetization inductance L6 of the transformer 91 is grounded through the diode D14, and one end is connected to the power supply terminal 1 through the diode D11, and thus the panel capacitor C _P. After the discharge operation, the energy recovery path to the power supply stage 1 is provided.

Meanwhile, in the case of the second energy recovery unit 100, the charge / discharge path of the panel capacitor C _P and the energy recovery path to the power supply terminal 1 are provided in the same manner as the above-described path.

Hereinafter, a sixth embodiment of the present invention having the configuration of FIG. 14 will be described with reference to FIGS. 4 and 15.

That is, FIG. 15 shows the switching timing of each of the control switches S1 to S4, S9, and S10, and the voltage waveforms at both ends of the panel capacitor C _P are the same as the waveform A of FIG.

That is, the T1 section is a section in which the panel capacitor C _P is charged with the sustain voltage. In this case, only the control switches S4 and S9 are driven on and the remaining control switches remain in the OFF state as shown in FIG. 15.

Therefore, the control panel (S9)-> diode (D9)-> the primary magnetization inductance (L5) of the transformer (91)-> panel capacitor (C _P )-> panel capacitor (C4) along the current path of the control switch (S4) C _P ) is charged to the holding voltage.

At this time, the primary magnetization inductance L5 of the transformer 91 of FIG. 14 is resonated with the panel capacitor C _P. When the resonance period is reached, the voltage V _P across the panel capacitor C _P reaches the holding voltage. At this time, the slope of the voltage rise of the panel capacitor C _P is shown in FIG. 4A.

When the voltage V _P at both ends of the panel capacitor C _P reaches the holding voltage at the positive polarity, the antiparallel diode of the control switch S4 is brought into a conductive state.

The T2 section and the T3 section are sections in which the sustain voltage is continuously applied to the panel capacitor C _{P. In} this case, only the control switches S1 and S4 are driven on, and the remaining control switches are kept off.

Accordingly, when the control switch S4 is driven on during the maintenance operation of the display panel in the T2 section, power loss due to the switching operation can be reduced because the control switch S4 is already in a conductive state.

In addition, the current flowing through the primary magnetization inductance L5 of the transformer 91 in the T2 section is the secondary magnetization inductance L6 of the diode D12-> transformer 91 as the control switch S5 is turned off. It is recovered to the power supply stage 1 through the current path of the diode D13.

That is, when current flow is interrupted in the primary magnetization inductance L5 of the transformer 91, the current energy charged in the primary magnetization inductance L5 of the transformer 91 may be changed according to the operation of the ideal transformer. The energy is transferred to the secondary magnetization inductance L6, and the energy recovery path of the above-described path is generated.

The period T4 is a period for storing the discharge current of the panel capacitor C _P as current energy in the primary magnetization inductance L5 of the transformer 91 resonating therewith. In this case, only the control switches S4 and S10 are driven on. The rest of the control switch is kept in the disconnected state.

Accordingly, the current path of the inverse parallel diode of the panel capacitor C _P- > primary magnetization inductance L 5-> diode D 5-> control switch S 10-> control switch S 4 of the transformer 91 is The primary magnetization inductance L5 of the transformer 91 stores the discharge current of the panel capacitor C _P as current energy. At this time, the voltage between both ends of the panel capacitor (C _P ) is as shown in FIG. The resonant current increases sinusoidally.

The T5 section is a section for recovering the current energy stored in the primary magnetization inductance L5 of the transformer 91 to the power supply stage 1, in which case all the control switches S1 to S4, S9, and S10 are turned off. do.

Therefore, the current energy stored in the primary magnetization inductance L5 of the transformer 91 is similar to the operation of the T2 section, and the secondary magnetization inductance L6-> diode D11 of the diode D14-> transformer 91 is similar. Is returned to the power supply stage 1 along the current path.

The voltage V _P between both ends of the panel capacitor C _P is maintained at zero potential.

Thereafter, in FIG. 3, the second energy recovery unit 100 connected to the sustain driving unit 30 charges and discharges the panel capacitor C _P in the negative polarity in the same manner as described above.

Therefore, according to the first to sixth embodiments, after the charge / discharge operation of the panel capacitor, the energy recovery path is set to the power supply stage, or after the discharging operation of the panel capacitor is completed, it flows along the discharge path. By resonating the resonant current in the inductor (Self Oscillating) and use it in the next charging operation of the panel capacitor it is possible to improve the energy recovery efficiency.

In addition, the voltage at both ends of the panel capacitor during the charging operation due to resonance with the inductor When the sustain voltage is reached at the resonance period, the slope of the voltage rise rapidly increases, and thus driving characteristics of the display panel can be further improved.

In addition, the number of circuit elements required in the configuration of the energy recovery device can be reduced by providing the energy recovery unit provided symmetrically with the holding driver interposed therebetween in the construction of the energy recovery device.

As described above, according to the present invention, after the charge / discharge operation of the panel capacitor is performed, the energy recovery path of the display panel is provided to the power supply terminal to improve energy recovery efficiency.

In addition, according to the present invention, the energy recovery efficiency of the display panel is improved by allowing the resonance current of the inductor to self-vibrate through the short-circuit loop in the device.

In addition, according to the present invention, by reducing the number of circuit elements required in the energy recovery device of the display panel, it is possible to save the occupied space of the energy recovery device in the display panel and reduce its production cost.

Further, according to the present invention, the voltage at both ends of the panel capacitor is charged. When the holding voltage is reached at the resonance period and the slope of the voltage rise is steep, the driving characteristics of the display panel can be further improved.

In addition, according to the present invention, after the charging operation of the panel capacitor is performed, the power loss due to the switching operation of the control switch can be reduced by conducting the anti-parallel diode of the control switch in advance during the holding operation of the holding driver.

Claims (19)

An energy recovery apparatus configured to recover charge / discharge energy by resonating with a panel capacitor of a plasma display panel, The energy recovery device is connected to a power supply terminal and is switched in accordance with an external control signal to maintain the display panel to drive the display voltage to the panel capacitor, while maintaining driving means for periodically discharging the charging energy; And a first inductor L1 disposed in the charging path of the panel capacitor and a second inductor L2 disposed in the discharge path, and are switched according to an external control signal after the charging and discharging operation of the panel capacitor. And an energy recovery means for recovering the current energy stored in each of the second inductors (L1, L2) to the power supply terminal. The method of claim 1, And said energy recovery means comprises first and second energy recovery means (40,50) symmetrically connected between both ends of said panel capacitor. The method of claim 2, The first and second energy recovery means 40 and 50 have one end of the first inductor L1 connected to a power supply terminal through a control switch S1 in the sustain driver 30, and the first inductor The other end of (L1) is configured to be grounded through the diode (D2), Energy recovery of the AC plasma display panel after the charging operation of the panel capacitor, the current energy stored in the first inductor (L1) is recovered to the power supply terminal via the anti-parallel diode of the control switch (S1). Device. The method of claim 2 or 3, One end of the first and second energy recovery means 40 and 50 is respectively connected to a power supply terminal through a diode D3, and the other end of the second inductor L2 is connected to the power supply terminal. It is configured to be grounded through the control switch (S2) in the maintenance drive unit 30, After the discharging operation of the panel capacitor, the current energy stored in the second inductor L2 is recovered to the power supply terminal via an anti-parallel diode of the control switch S2. Recovery device. The method according to claim 1 or 2, The panel capacitor is a resonance operation with the first inductor (L1) An energy recovery device of an AC plasma display panel, wherein the resonant cycle is charged up to a sustain voltage. The method of claim 1, The energy recovery means 60 is connected to only one side of the panel capacitor, and the panel capacitor resonates with the first inductor L1 in positive polarity, and resonates with the second inductor L2 in negative polarity and maintains a voltage. Energy recovery device of the AC plasma display panel, characterized in that the charge to. The method of claim 6, The energy recovery means 60 is one end of the first inductor (L1) is connected to the power supply terminal through the control switch (S1) in the holding drive unit 30, the other end of the first inductor (L1) diode A first path formed by being grounded through D2; One end of the second inductor L2 is connected to the power supply terminal through the diode D3, and the other end of the second inductor L2 is grounded through the control switch S2 in the holding driver 30. An energy recovery apparatus for an AC plasma display panel, comprising: providing an energy recovery path to a power supply terminal through a second path; The method of claim 6, Each of the first paths provides an energy recovery path to a power supply stage after a charging operation at a positive polarity of the panel capacitor and a discharge operation at a negative polarity of the panel capacitor, And each of the second paths is configured to provide an energy recovery path to the power supply stage after the discharge operation in the positive polarity of the panel capacitor and after the charging operation in the negative polarity of the panel capacitor. The method according to any one of claims 6 to 8, The panel capacitor C _P is a resonance operation with the first and second inductors L2. An energy recovery device of an AC plasma display panel, wherein the resonant cycle is charged up to a sustain voltage. An energy recovery apparatus configured to recover charge / discharge energy by resonating with a panel capacitor of a plasma display panel, The energy recovery device is connected to a power supply terminal and is switched in accordance with an external control signal to maintain the display panel to maintain the driving voltage to the panel capacitor and the discharge driving means for periodically discharging the charging energy, A first inductor L3 connected to one side of the panel capacitor and providing a discharge path at the positive polarity of the panel capacitor and a discharge path at the negative polarity of the panel capacitor; and switched according to an external control signal after the charging operation of the panel capacitor; First energy recovery means 70 for recovering current energy stored in the first inductor L3 to the power supply terminal; A second inductor L4 connected to the other side of the panel capacitor to provide a discharge path in the positive polarity and a charge path in the negative polarity of the panel capacitor, and is switched according to an external control signal after the charging operation of the panel capacitor; And energy recovery means (80) for recovering current energy stored in the second inductor (L4) to the power supply terminal. The method of claim 10, In the first energy recovery unit 70, one end of the first inductor L3 is connected to one side of the panel capacitor and the other end is connected to a power supply terminal through a diode D5 to form a first path. The second energy recovery unit 80 has one end of the second inductor L4 connected to the other side of the panel capacitor and the other end connected to the power supply terminal through the diode D7 to form a second path. An energy recovery device of an AC plasma display panel, characterized by providing an energy recovery path to a power supply terminal through first and second paths. The method of claim 11, Each of the first paths provides an energy recovery path to a power supply stage after a charging operation at a positive polarity of the panel capacitor and a discharge operation at a negative polarity of the panel capacitor, And each of the second paths is configured to provide an energy recovery path to the power supply stage after the discharge operation in the positive polarity of the panel capacitor and after the charging operation in the negative polarity of the panel capacitor. The method according to any one of claims 10 to 12, The panel capacitor is a resonance operation with the first and second inductors (L3, L4) An energy recovery device of an AC plasma display panel, wherein the resonant cycle is charged up to a sustain voltage. An energy recovery apparatus configured to recover charge / discharge energy by resonating with a panel capacitor of a plasma display panel, The energy recovery device is connected to a power supply terminal and is switched in accordance with an external control signal to maintain the display panel to maintain the driving voltage to the panel capacitor and the discharge driving means for periodically discharging the charging energy, A transformer 91 which is symmetrically connected between both ends of the panel capacitor and disposed in the charge / discharge path of the panel capacitor, and is switched according to an external control signal after the charging and discharging operation of the panel capacitor, respectively; AC type plasma, characterized in that it comprises a first and second energy recovery means (90,100) for recovering the current energy induced in the primary magnetization inductance (L5) of the secondary side magnetization inductance (L6) to the power supply terminal. Energy recovery device for display panel. The method of claim 14, A first path having one end of the secondary magnetization inductance L6 of the transformer 91 grounded through the diode D12 and the other end connected to the power supply terminal through the diode D13, and the secondary magnetization inductance; The other end of the (L6) is grounded through the diode (D14) and one end is connected to the power supply through the diode (D11) characterized in that to provide an energy recovery path to the power supply through a second path formed Energy recovery device for AC plasma display panel. The method of claim 15, After the charging operation of the panel capacitor, the current energy induced in the secondary magnetization inductance L6 is recovered to the power supply terminal through the first path, The energy recovery device of the AC plasma display panel, characterized in that the current energy induced in the secondary magnetization inductance (L6) after the discharge operation of the panel capacitor is recovered to the power supply terminal through the second path. The method according to any one of claims 14 to 16, The panel capacitor resonates with the primary magnetization inductance L5 of the transformer 91. An energy recovery device of an AC plasma display panel, wherein the resonant cycle is charged up to a sustain voltage. In the energy recovery method through the first and second inductors connected to the energy recovery means on one side of the panel capacitor of the display panel and resonating with the panel capacitor, A first step in which current energy stored in the first inductor L1 charges the panel capacitor to a positive sustain voltage; A second step in which the display panel is driven by a sustain voltage applied through a power supply terminal; A third step of storing current energy in the second inductor L1 during the discharging operation of the panel capacitor; A fourth step in which the current energy stored in the second inductor L2 forms a short-circuit loop to maintain the amount of current; A fifth step of charging the panel capacitor to a negative sustain voltage by the current energy stored in the second inductor L2 A sixth step of maintaining and driving the display panel by a sustain voltage applied through a power supply terminal; A seventh step of storing current energy in the first inductor L1 during the discharging operation of the panel capacitor; And an eighth step in which the current energy stored in the first inductor (L1) forms a short-circuit loop to maintain the amount of current. In the energy recovery method through the inductor resonant after the discharge operation of the panel capacitor in the display panel, A first step in which the display panel is driven by a sustain voltage applied through a power supply terminal; A second step of resonating the inductor during the discharging operation of the panel capacitor and storing the resonant current as current energy; A third step in which the current energy stored in the inductor forms a short-circuit loop to maintain the amount of current; And a fourth step of charging the panel capacitor to the sustain voltage by the resonance operation of the current energy stored in the inductor.