TW530281B - Energy recovery driving circuit and method with current compensation for AC plasma display panel - Google Patents

Abstract

A kind of energy recovery driving circuit and method using current compensation and parallel resonance to drive AC plasma display panel are disclosed in the present invention. The plasma display panel is approximately equal to a loaded capacitor that sustains the display of an image signal through continuous charging and discharging. The driving circuit uses the parallel resonance generated between the external inductor and the plasma display panel to decrease energy loss of panel caused by rapid charging and discharging. In addition, by using current compensation to decrease voltage drop caused by the flowing of large current through the conduction resistance of the switch at the instant of plasma discharging, the wall charge accumulation is then increased so as to expand the operation voltage range of the plasma display panel. Furthermore, zero voltage switching can be obtained for all four switches of the voltage clamping circuit.

Description

530281 V. Description of the invention (l) Field of application in the industry-The present invention provides a driving circuit and method of an AC Piasma DlspUy panel (AC pDp) with a current compensation function, especially a utilization Inductive and plasma display panels, such as capacitors, 7, vibrate to eliminate two energy losses caused by rapid charge and discharge of plasma display panels, and drive circuits and methods to increase the operating voltage range of plasma display panels through current compensation. The plasma display has the advantages of light weight, thin thickness, wide viewing angle, long life, contrast, and other advantages. It is especially suitable for high-definition television (HDTV); please refer to ^ 二, the first picture is the structure of the plasma display , The plasma display main f ^ f after the two missing discharge gas (usually a mixture of Ne and Xe gas) and two electrodes composed of scan electrode Y (, scanning electrnHD, ”ctrode), sustain electrode X (sustairi electrode) in months.., ^ L address electrode A (address electrode), in which the scan of the scan board; 1 ¾ Secret: # & ^ ^, the electrode and the maintenance electrode are arranged in parallel, and the address of the rear plate is urgent ^ The vertical queue; 3, because the scan electrode and the sustain electrode are composed of a transparent material IT0, the on-resistance is large, so a layer of bus electrodes (bus electrode) is coated on the surface. In order to reduce the on-resistance, the dielectric layer (dleUctri (: Uyer)) and the protective layer (emulsion ^ Mg〇) are sequentially covered, so there is an equivalent capacitance between the electrodes, which =, except for the protective layer Protects electrodes from plasma damage In addition also provides a secondary electron (sec〇ndary electron) plasma solution help

C: \ tmp \ patent. Ptd Page 4 530281 V. Description of the invention (2) Isolation; and the address electrodes are covered with three red, blue and green fluorescers, and the plasma and external light generated by plasma discharge are converted into full color Visible light, and barrier ribs between the address electrodes are not only used to support the front plate and the rear plate, but also to avoid interference of light of different colors. Most of the AC plasma displays use the "address-display-separation (ADS)" method; see the second picture, a TV day (TV fie 1 d) is divided into eight Sub-fields, each of which consists of three sections: reset, address, and display. During reset, high voltage (usually high) (At 34 0V) to illuminate the entire plasma display panel, so that the initial state of all pixels (pixels) are consistent; during the addressing period, according to the image to be displayed, scanning pulses (scanpu) are provided on the scanning electrodes and the addressing electrodes, respectively. 1 se) and data pulses (data pu 1 se), so as to implant wall charges (wa 11 charge) in the appropriate position; during the display, provide staggered sustain pulses on the scan electrode and the sustain electrode (sustain pulse) ) To display the image; and the gray scale of the image uses the binary-coded light-emission-period method, that is, the time length ratio of the display segments of the eight sub-screens is 1: 2 : 4: 8: 16: 32: 64: 128, so the three colors of red, blue, and green can each exhibit a 2U56 gray scale. AC plasma display panel has memory characteristics; please refer to the third

C: \ trap \ patent. Ptd Page 5 of the fifth description of the invention (3), in the third (a), the scan electrode holding pulse voltage Vs is lower than the breakdown voltage of the gas ° maintaining the voltage provided on the electrode ; In the third (b) diagram, at the address bd, there will be no plasma pulses and scanning pulses — Vy, and 0 is added to the scanning electrodes, resulting in gas discharge; Three (〇d + Vy) greater than the breakdown voltage charge is accumulated on the dielectric layer, which is called wall electricity @ electricity water discharge. This wall charge will offset the applied voltage in the gas] w = u char§e), and only Discharge; in the third u) diagram, when weite r cross-pressure, the voltage at which the plasma will stop is the added sustaining pulse voltage and y-skin two-phase pressure across the gas: The voltage,… will lead; the cumulative time offsets the applied voltage, so the gas stops solution: two; as shown in Figure 4. ：： dimensional r wave again ^ Di Yi (ί) diagram, not to mention, in practice, once the gas is removed and wall charges accumulate 'provide a staggered sustaining pulse (Vs < Vbd) can allow the electro-polymerization to continue to discharge' This is the record of AC plasma display panel. ~ M When we provide sustain pulses to scan electrodes and sustain electrodes, and charge and discharge the internal equivalent capacitance of the plasma display, 'For each charge or discharge, the power supply must provide 0-5CP ( Vs) 2 energy, where cp is the equivalent capacitance of the plasma display panel, and vs is the voltage at the power supply end. However, due to the sudden short-circuit or high voltage applied to the two poles of the capacitive load, a large current will be caused in an instant. The energy is consumed by the components in the circuit and the equivalent resistance of the plasma display panel.

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Shang

If the frequency of the sustaining pulse wave is [, then, "2fCP (Vs) '2; Therefore, as the energy consumed by j is equal to its internal equivalent capacitance, it also changes accordingly. The size of the water display panel is getting larger and larger. The traditional plasma shows that the driving force of crying is φ. Therefore, the energy consumed is also increased by the inductance and capacitance. In order to reduce the energy loss, the plasma display panel is slowly charged and discharged with. An on-resistance will be generated, and a large current will flow. Because the switching element actually crosses the electric current-^ Γ will cause a voltage drop on the switching element, causing a voltage VS. Enter two or two, and the voltage at the opposite end will be less than In addition to maintaining the pulse pressure to maintain the electrical accumulation of the technician, it is necessary to provide a high radio wave voltage drop = R discharge, that is, the voltage drop will cause the maintenance pulse tF to dry down. [Knowledge Technology ] The four pictures of the effect of lightning, the fourth picture is the conventional use of a plasma display panel, etc. Qin # :, series resonance between the senses to reduce energy loss energy recovery thunderbolt g_, the drive circuit is used to Driven AC Plasma Display panel; Electro-hydraulic 4 = The panel can be represented by an equivalent capacitor Cp, which is used to maintain the display of the _image signal through continuous ^ discharge; the driving circuit includes a voltage composed of four transistors Ml, M2, M3 and M4 A custom circuit, one side of which is a bidirectional switch composed of diodes ^, D2 and transistors M5, M6, and then forms a series resonance circuit with inductor u and valley Cssl, and the other side is composed of diodes D3, D4 and electricity A bidirectional switch composed of crystals M7 and M8, and then shaped as inductor L2 and capacitor Css2

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530281 V. Description of the invention (5) * ------ Oscillation caused by a two-pole static n parasitic element. ,, D6, D7, and D8 are used to suppress. Please refer to the fifth figure. In the fifth figure, vP is a plasma display panel, etc. ^ The timing diagram of the driving circuit of the fourth diagram, and the capacitor shown in the control timing diagram of the diagram. The potential difference across Cp; the fifth J digging procedure is as follows: Step 1: Before to, the Thunder switch is in the off state, so = body secret 1 & M4 is on, the other to the voltage source ¥ 3 and the ground wire . 2. The two ends of the poly display panel are respectively connected to step 2: crystal M6 between 10 and 11, at this time the plasma display surface ^, close the transistor M1, and then turn on the resonance circuit, the inductance L1 and the capacitance Csd of the plasma display panel A series inductance L1 is formed to induce a reverse electromotive force, and the Huai power current starts to flow through the inductance L1, and this% generates a resonance current. Step Three: At the n to 11 of the plasma display panel, the potential of the plasma display panel is connected to the day, and ^^ is widely known as the resonance half cycle & when it is recognized) X% 丨 gets near ground, at this time the crystal M3 is turned on. After a period of time, the transistor is again connected to ground the Vx potential and M6 is turned off. Step 4: Between t2 and t3, turn off the transistor M4, and then turn on the transistor M7. At this time, the plasma display panel, inductor L2 and capacitor Css2 form a series resonance circuit, and the discharge current of the plasma display panel begins to flow through the inductor. L2,

C: \ tmp \ patent.ptd Page 8 530281 V. Description of the invention (6) The inductor L2 induces the back electromotive force and generates a resonance current. Step 5: Between 1 and 4, which is at time t3 after the resonance half cycle. 'When the potential of the plasma display panel is closest to the voltage source, the crystal M2 is turned on to control the Vy potential at%, and the transistor M7 is turned off after a period of time.

Step 6: Between t4 and t5, turn off the transistor M2, and then turn on the transistor M8. At this time, the plasma display panel, inductor L2 and capacitor id form a series resonance circuit. The discharge current of the plasma display panel begins to flow through the inductor. L2, the inductor L2 induces a reverse electromotive force, thereby generating a resonance current, and the direction of the inductor current is opposite to the direction of the current in step 4. Step 7: Between 15 and 16, that is, after the resonance half cycle, when the Vy potential of the plasma display panel is closest to the ground line, the crystal μ 4 is turned on at this time.

In order to set the Vy potential to zero, the transistor M8 is turned off after a period of time. Step 8: Between t6 and t7, turn off transistor M3, and then turn on transistor M5. At this time, the plasma display panel, inductor L1, and capacitor c form a series resonance circuit. The discharge current of the plasma display panel begins to flow through the inductor. L1. The inductor L1 induces a reverse electromotive force, thereby generating a resonance current, and the direction of the inductor current is opposite to that of the current in step 2.

530281

Step 9: At 17 7 which is the moment of the resonance half cycle at this moment t7, when the plasma display panel v, the time guide: the crystal ship so as to twist the Vx potential at = gate: and then the transistor M5 is off. s Only leaves the ground to be continued :: put = two electricity ::-the series resonance in the circuit shown in the fourth figure using the additional inductor and the equivalent valley of the plasma display panel, reducing the plasma display panel in the voltage source% The energy consumed when switching between ground and ground; please refer to Figure 6, Figure 6 uses the circuit in Figure 4 to light the eight-inch plasma display panel. Voltage and current waveform flowing through the panel; as seen in the sixth figure, when the voltage across the plasma display panel reaches vs or-, the plasma starts to discharge, and a large amount of electricity will be generated at the instant of the plasma discharge. Current, due to the on-resistance of the transistor, a large voltage drop will occur when the large current flows through the transistor. This voltage drop will cause the transient voltage across the plasma display panel to instantly decrease, thereby reducing the accumulation of wall charges. , Which further narrowed the operating voltage range of the plasma display panel. [Objective of the Invention] Therefore, the main object of the present invention is to provide an energy recovery driving circuit and method for a plasma display panel with a current compensation function, using an inductor

C: \ tmp \ patent. Ptd Page 10 530281 V. Description of the invention (8) Resonance with the plasma display panel to reduce the energy loss caused by rapid charge and discharge of the panel. In addition, current compensation is used to reduce the instant of plasma discharge. The voltage drop caused by the generated large current will further increase the wall charge accumulation and expand the operating voltage range of the plasma display panel. In addition, the four switches of the voltage circuit can achieve zero voltage switching. The diagram of the plain sheet is attached with J points and I is displayed. Ο I is the site where the structure r is constructed to show the slurry. Electro-Electrical diagram type flow current wave wave intersection and the sequence diagram is a two-moving and driving electric discharge slurry electric exercise for the diagram is shown in Figure 345. The driving surface of the drive-recovery energy display shows the electric flow of the electric power flow in the sequence diagram of the electric drive. Figure 4 shows the graphic wave in the road area. This section is a diagram of the sequence diagram of the horse power recovery in the electric circuit of the electric circuit in the electric circuit of the electric circuit in the electric circuit of FIG. The sub-map is sequenced, the road map is used for electrical operation, and the fine wave type is detailed. The other is mentioned. The road and the electricity are driven. The drive is driven by the middle and the middle. Figure 7.80.90. The second paragraph of the manual use of power to compensate for supplemental electric appliances. The issued version is shown in Figure 7. Figure 7.

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The energy display panel is continuously filled with a negative plasma display electrode with a first non-panel pole body connected to the second end of the second panel. The connection is a first, second, first, and first end and a first Four terminals, while another control six series by M0S and each transistor 4 is a driving circuit. The driving circuit is used to drive the AC type plasma to display the sound of the sound. The equivalent capacitance Cp is not available on the panel. Here, it is used to display a video signal to 4 Shiwei through Dundun; the driving circuit contains the thunder sense 1, # 二 山 'the first and second ends of this inductor and the plasma display ^ respectively Connected to the positive terminal of a ninth diode D9, and the ninth terminal is connected to a fifth switch M 5 'the other end of the fifth switch is connected to the second end of the surface f; a second inductor L2, this The first end of the inductor is connected to a twelfth pole body of the twelfth pole!) 丨 the positive end of the inductor is connected to the plasma display # terminal, and the negative end of the twelfth pole body and a sixth switch M6 and the other end of the sixth switch are The first terminal of the plasma display panel is connected to the negative terminals of the seventh and eighth diodes (D7, D8), and the first and second inductors, respectively. The first end is connected, and the other end is grounded. A third switch (M1, M3) is electrically connected to the plasma display panel, and the other end is connected to the voltage source and the ground wire respectively. A second switch (M2, M4) ) The second end electrically connected to the plasma display panel is connected to a voltage source and a ground wire respectively; a control circuit uses switches M1, M2, M3, M4, M5, and M6, and the six switches It consists of metal oxide semiconductor transistors. There is a parasitic diode between the drain and source of the body. In the seventh figure, D1, D2, D3, D4, D5, and D6, and parasitic capacitances ci, C2, C3, and C4 also exist between the non-pole and the source. Please refer to the eighth figure. The eighth figure is the energy recovery driving circuit in the seventh figure.

C: \ tmp \ patent.ptd Page 12 530281 V. Control timing diagram of the invention description (ίο); Vp is the potential difference between the equivalent capacitance Cp of the electric display panel 'Ιυ is the current flowing through the inductor L1' is flowing through the inductor The current of L2, the control sequence shown in the control timing diagram of Figure 8 is as follows: Step 1: Before to, the switches M1 and M4 are on, and the other switches are off. Therefore, the potential difference between the two ends of the plasma display panel VP is Step 2: Between to to t1, the switch M5 is turned on, and the current Iu on the inductor L1 increases linearly. The voltage source Vs will increase the current Iu flowing through the inductor L1 to the first through the first switch M1 and the fourth switch M4. Some predetermined value Iu, raax. Step 3: From t1 to t2, please refer to the ninth figure, turn off the fourth switch M4 to make the current Iu of the inductor L1 start to discharge the plasma display panel CP and the capacitor C2, and charge the capacitor C4 to make the plasma display panel The potential at the Y terminal ¥¥ increases. Step 4: From t2 to t3, please refer to the tenth figure. When the potential Vy is increased to the voltage source Vs at time t2 and the parasitic diode D2 of the second switch M2 is turned on, the current Iu of the inductor L1 will begin to flow through the parasitic The diode D 2 is turned on at this time to achieve zero voltage switching. Step 5: During the period from t3 to t4, please refer to the eleventh figure. Turn off the first switch M1 so that the current Iu of the inductor L1 starts to plasma display panel CP and capacitor.

C: \ tmp \ patent.ptd Page 13 530281 V. Description of the invention (11) Charge C1 and discharge capacitor C3, so that the potential vx at the X terminal of the plasma display panel decreases. Step 6: From t4 to t5, please refer to the twelfth figure. When the potential ¥, drops to the ground potential at time t4 and the parasitic diode D3 of the third switch M3 is turned on, the current Iu of the inductor L1 will begin to flow through Parasitic diode D3. At this time, the third switch M3 is turned on to achieve zero voltage switching, and the potential difference VP between the two ends of the plasma display panel is -Vs, and the current Iu of the first inductor L1 starts to decrease 0. Step 7: At t 5 During t 6, when the current Iu of the inductor L1 is reduced to zero at 7-5, the fifth switch M5 is closed, and the switches M2 and M3 continue to be turned on. Therefore, the potential difference VP across the plasma display panel remains at -Vs. Step 8: Between t6 and t7, when the sixth switch M6 is turned on, the current Iu on the inductor L2 increases linearly, and the voltage source Vs will increase the inductor current Iί2 to a predetermined value through the second switch M2 and the third switch M3. Value Il2, raax. Step 9: During t 7 to 18, please refer to the thirteenth figure, turn off the second switch M2 so that the current I2 of the inductor L2 starts to discharge the plasma display panel CP and the capacitor C4, and charge the capacitor C2 to make the plasma Potential at the Y terminal of the display panel

Vy drops. Step 10: During t8 to t9, please refer to Figure 14 when the potential Vy

C: \ trap \ patent. Ptd Page 14 530281 V. Description of the invention (12) When the potential drops to ground at time 18 so that the parasitic diode D4 of the fourth switch M4 is turned on, the current I u of the inductor L 2 will begin to flow. At this time, the parasitic diode D 4 ^ turns on the fourth switch M 4 to achieve zero voltage switching. Step 11: During the period from 19 to 110, please refer to the fifteenth figure. Turn off the third switch M3 so that the current I2 of the inductor L2 starts to charge the plasma display panel CP and the capacitor C3, and discharge the capacitor C1 to make the electricity The potential of the X terminal of the display panel is raised. Step 12: During the period from 110 to 111, please refer to the sixteenth figure. When the potential ¥ is raised to the voltage source Vs at time 110 to make the parasitic diode D1 of the first switch M1 conductive, the inductance L 2 at this time The current will begin to flow through the parasitic diode D1. At this time, the first switch M1 is turned on to achieve zero voltage switching, the potential difference VP across the plasma display panel is Vs, and the second inductor L 2 current Iu starts to decrease. Step 12: Between 111 and 11 2 'When the current I u of the inductor L 2 decreases to 111 at zero, the sixth switch M 6 is closed, and the switches M1 and M4 continue to be turned on. Therefore, the potential difference between the two ends of the plasma display panel VP remains at vs. Step 14: Repeat steps 2 to 12 so that the plasma display panel can maintain the display of the image signal through the charge and discharge of the performance. At times 14 and 110, when the voltage VP across the plasma display panel is -Vs

C: \ tmp \ patent. Ptd Page 15 530281 V. Description of the invention (13) or Vs, the plasma starts to discharge. At this time, the large current required for plasma discharge is supplied by the inductor current Iu or 1 [^ instead of It is supplied by the voltage source \ through the transistors M2, M3 or transistors M1, M4 ', so there is no problem of voltage drop caused by the on-resistance of the transistor through the transistor. The above is the so-called "current compensation" of the present invention; There is no voltage drop at the moment of discharge, so the wall charge accumulation can be promoted, thereby increasing the voltage operating range of the plasma display panel. During step two and step eight, increase the current of the first inductor L1 and the second inductor L2 to Iu, max, and Ιί2, and ^ χ needs to be larger than the desired compensation current, because before the plasma discharge, the inductor L1 or L The current on 2 must be used to charge and discharge the capacitors Cp, Cl, C2, C3, and C4. Therefore, when the plasma is discharged, the current provided by the inductor L1 or L2 will be slightly less than Iu, max or Ιί2, _. During step 6 and step 12, after the inductor current Iu or L is supplied with the current required for the plasma discharge, its current will return the energy to the power supply terminal Vs via the diode D2, D3 or D1, D4, which is called energy recovery. .

C: \ tmp \ patent. Ptd page 16 530281 V. Description of the invention (14) It can be seen that after adding the current compensation, the voltage drop caused by the large current of the original plasma discharge flowing through the equivalent on-resistance of the transistor has disappeared. Already. Please refer to Figure 18, which is another control timing diagram of the driving circuit of Figure 7. Vp is the potential difference across the equivalent capacitance cp of the electric display panel, IL1 is the current flowing through inductor L1, and IL2 is flowing through The current of the inductor L2; the control sequence shown in the control timing chart of Figure 18 is as follows: Step 1: Before 10, the switches M1 and M4 are on and the other switches are off. Therefore, the two ends of the plasma display panel The potential difference Vp is

Vs. Step 2: During t 0 to 11, when the switch M5 is turned on, the current IL1 on the inductor L1 increases linearly, and the voltage source Vs will increase the current iL1 flowing through the inductor to a certain value through the first switch mi and the fourth switch M4. Predetermined value. Step Three: Between t1 and t2, turn off the first switch M1 and the fourth switch M4 so that the current IL1 of the inductor L1 starts to flow through the plasma display panel core and discharge the capacitors C2 and C3. Charging raises the potential Vy at the Y terminal of the plasma display panel, while reducing the potential \ at the X terminal. Step 4: Between t2 and t3, when the potential vy is raised to the voltage source Vs at time t2 to make the parasitic diode of the second switch M2]) 2 conductive, and when the potential Vx is dropped to the ground line at time t2 so that Parasitic diode of the third switch M3

C: \ tmp \ patent.ptd Page 17 530281 V. Description of the invention (15) When the body D3 is turned on, the current Iu of the inductor L1 will begin to flow through the parasitic diodes D2 and D3. At this time, the switches M2 and M3 are turned on to achieve Zero voltage switching. At this time, the potential difference Vp between the two ends of the plasma display panel is -Vs' and the current Ijj of the first inductor L1 starts to decrease. Step 5: During the period 13 to 14, when the current Iu of the inductor L 1 decreases to 13 at zero, the fifth switch M5 is closed, and the switches M2 and M3 continue to be turned on. Therefore, the potential difference VP across the plasma display panel remains at -Vs. Step 6: During the period from t4 to t5, the sixth switch M6 is turned on, so that the current I2 of the inductor L2 increases linearly. The voltage source Vs will increase the current Iu of the inductor to a certain value via the second switch M2 and the third switch M3. The predetermined value Il2, max. Step 7: During t5 to t6, turn off the second switch M2 and the third switch M3 so that the current of the inductor L2 starts to flow through the plasma display panel CP, discharge the capacitors C1 and C4, and charge the capacitors C2 and C3. , So that the potential Vy of the Y terminal of the plasma display panel decreases, while the potential of the X terminal ¥ \ rises. Step 8: Between t 6 and t 7, when the potential Vy drops to the ground at time 16 and the parasitic diode D4 of the fourth switch M4 is turned on, and when the potential is ramped up, the voltage source Vs is raised at time t6 such that When the parasitic diode D1 of the first switch M1 is turned on, the current I2 of the second inductor L2 starts to flow through the parasitic diodes D1 and D4. At this time, the switches M1 and M4 are turned on to achieve zero voltage switching. At this time, the potential difference between the two ends of the plasma display panel and the current of the second inductor L2

C: \ trap \ patent, ptd page 18 530281 V. Description of the invention (16) The stream starts to decrease. Step 9: During the period from 17 to 18, when the current I 2 of the inductor L 2 is reduced to zero at 17, the sixth switch M6 is closed, and the switches M1 and M4 continue to be turned on. Therefore, the potential difference VP across the plasma display panel remains at Vs. Step 10: Repeat steps 2 to 9 so that the plasma display panel can maintain the display of the image 5 tiger through charge and discharge.

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Claims (1)

530281 t, patent application scope 1, an energy recovery driving circuit of a plasma display panel with a current compensation function. The plasma display panel is approximately a load capacitor, which is used to maintain the display of an image signal through continuous charging and discharging. The driving circuit includes a first inductor. The first end and the second end of the inductor are respectively connected to the first end of the plasma display panel and the positive end of a ninth diode, and the negative end of the ninth diode. Terminal is connected to a fifth switch, the other end of the fifth switch is connected to the second end of the plasma display panel, a second inductor, the first end and the second end of the inductor are respectively connected to a twelfth pole body. The positive end is connected to the second end of the plasma display panel, and the negative end of the twelfth pole is connected to a sixth switch. The other end of the sixth switch is connected to the first end of the plasma display panel. A seventh And the negative terminal of the eighth diode are respectively connected to the second terminal of the first inductor and the first terminal of the second inductor, and the other ends are grounded, and a first and a third switch are electrically connected to the plasma display panel The first end and the other end respectively At the voltage source and the ground line, a second and a fourth switch are electrically connected to the second end of the plasma display panel, and the other ends are respectively connected to the voltage source and the ground line. A control circuit is used to control the switch to the electrical power. The liquid crystal display panel continues to be charged and discharged; the six switches are all composed of a transistor, and a parasitic diode and a parasitic capacitor exist between the wave electrodes (D rai η) and (Source) of each transistor. C: \ tmp \ patent. Ptd Page 20 530281 VI. Patent application scope (1) When the fifth switch is turned on, the current on the first inductor increases linearly, and the voltage source will flow the current through the first switch and the fourth switch. The current through the first inductor is increased to a predetermined value; (2) The fourth switch is turned off so that the current of the first inductor starts to discharge the equivalent capacitance of the plasma display panel and the parasitic capacitance of the second switch, and The parasitic capacitance of the switch is charged, so that the potential of the second end of the plasma display panel is increased; (3) When the potential of the second end of the plasma display panel is increased to a voltage source, so that the parasitic diode of the second switch is turned on, the first inductance The current will begin to flow through the parasitic diode of the second switch. At this time, the second switch is turned on to achieve zero voltage switching. (4) After a period of time, the first switch is turned off so that the current of the first inductor starts to display on the plasma. The equivalent capacitance of the panel and the parasitic capacitance of the first switch are charged, and the parasitic capacitance of the third switch is discharged, so that the potential of the first end of the plasma display panel decreases; (5) When the potential of the first end of the plasma display panel decreases When the ground potential makes the parasitic diode of the third switch conductive, the current of the first inductor will begin to flow through the parasitic diode of the third switch. At this time, the third switch is turned on to achieve zero voltage switching, and the plasma The potential difference VP across the display panel is -Vs, and the current of the first inductor starts to decrease; (6) When the current of the first inductor decreases to zero, the fifth switch is turned off, and the second switch and the third switch continue to be turned on, so , The potential difference VP between the two ends of the plasma display panel is still maintained at -Vs; (7)-after a period of time, the sixth switch is turned on, and the current of the second inductor is C: \ tmp \ patent.ptd Page 21 530281 Inductive second second will be off third and off on second second by Jinghe Yueyuan Piezoelectric Circumference, Fan Jiazhuan Gao Gao = ° Six-line display of plasma electricity to EfJ1 flow Inductive power of electricity; the first value is set to pre-close one to open the second to the second to close the lift flow} C afJ of electric power 8, fourth power and electric capacity make electric charge, capacitive efficiency, etc. Twenty-twoth place to the electricity and the end of the second side of the board to display the display of the off-site slurry, so that the ground is connected to the lower-end side of the second-side board showing the display of the paste ^ ttD "^ a When N) / 9 poles, the second life, the second life, the second life, the second life, the QtiN, the fourth pass, the current start, the zero pass, and the current flow, the current will be sensed, the second pass, and the second pass. The sense of current l ^ ttD ^ ¾ The second pass to the gate ΠΠ 9 ^ The third pass to the 9HW time period; a change} Cut ο Press rH power C to charge the display board on the surface of the first board The three sides of the board and the capacitor discharge capacitor, the order of ^, etc. are displayed on the display board. Right to the beginning, the power is turned on so that the source voltage is raised to the end of the power-the first surface of the display shows, the water is raised to the right position} The 1 terminal C of the electricity 1 is the first to pass the current off ΓζΠΪΓΒ ^ The second pass of Dentsu, at this time, the second pass of the second pass, the second pass of the second pass, the second pass of the second pass, the first pass of the second pass, the first pass, the first pass, and the first pass, ν ^ ο is ν ^ Γ. The surface, showing less sizing reduction, ^ ag ^, and the current, the electric piezo-electricity of the piezo-electricity is completed and reached, and the two closed plates are opened, and the closed-closed piezo-electricity is shown. So far, the Shaotong reduced the continuity of the electricity and continued the sense of closing. The power was turned on, the second and the off, \ J / 2, and IX C, and the face was displayed. The telex makes the display of the teu 2 news IX like the C shadow step. \ 1 / is the 2 step of the C charge and maintenance step. Continued VP resumption. The difference is determined by the position. {Board C: \ tmp \ patent. Ptd Page 22 530281 VI. When the potential at the end of the patent application scope drops to the ground line and the parasitic diode of the third switch is turned on, the current of the first inductor will begin to flow through the second and the first. The parasitic diode of the three switches, the second switch and the third switch are turned on at this time to achieve zero voltage switching; at this time, the potential difference vP across the plasma display panel is -vs, and then the current of the first inductor starts to decrease; (4 ) When the current of the first inductor decreases to zero, the fifth switch is turned off, and the second switch and the third switch continue to be turned on. Therefore, the potential difference VP between the two ends of the plasma display panel is still maintained at -Vs; (5) for a period of time Then, the sixth switch is turned on, so that the current of the second inductor increases linearly. The voltage source will increase the current of the second inductor to a predetermined value through the second switch and the third switch; (6) Turn off the second switch and the first switch. Three switches to make the current of the second inductor begin to flow through the plasma display The panel and discharges the parasitic capacitances of the first and fourth switches, and charges the parasitic capacitances of the second and third switches, so that the potential of the second end of the plasma display panel decreases and the potential of the first end increases; (7) When the potential of the second end of the plasma display panel is lowered to the ground line to make the parasitic diode of the fourth switch conductive, and when the potential of the first end of the plasma display panel is raised to a voltage source, the parasitic diode of the first switch is made When conducting, the current of the second inductor will begin to flow through the parasitic diodes of the first and fourth switches. At this time, the first and fourth switches are turned on to achieve zero voltage switching. At this time, the potential difference between the two ends of the plasma display panel VP is Vs, and then the current of the second inductor starts to decrease; (8) When the current of the second inductor decreases to zero, the sixth switch is turned off, and the first switch and the fourth switch continue to be turned on. Therefore, the plasma display panel has two end C: \ tmp \ patent.ptd p. 25