TW516015B - Energy recovery circuit of plasma display panel driving circuit - Google Patents

Abstract

The present invention provides an energy recovery circuit of plasma display panel driving circuit, which includes a plurality of switching devices. With different control states in the driving signal cycle of the switching device, and the effect of inductors connected in series, the circuit is able to decrease the current stress on the switch and decrease the influence of parasitic devices in the process of withdrawing energy stored in the plasma display panel, thereby improving the conventional circuit design, decreasing the cost, and reducing the switching loss.

Description

516015

V. Description of the invention (1) (1) Technical field of the invention The present invention relates to a plasma display surface complex circuit 'especially used to drive an alternating current three-electrode plasma display circuit. The current stress on the switching element and the reduction of the current stress on the circuit and the reduction thereof Send the plant panel to reduce the influence of all parts on the circuit. (II) Technical background of the invention

m ;;] At the beginning, the bridge that provided communication with the machine gradually progressed to today's multimedia audiovisual applications, and its application range is very wide, such as TV computers, monitors, stadium kanbans, instrument panels, watches, and so on. At present, the types of displays are roughly: cathode ray tubes (Cathode Ray

Tube: CRT), Liquid Crystal Display: LCD, Electroluminescence Display (Electr—Luminescence: el), Plasma Display Panel (PDP), Vaccum Fluorescence Display: VFD ), Field effect launch

Display (Field Emission Display: FED) ... Among them, the cathode ray tube has the disadvantages of large volume, high distortion, and large size. However, although the liquid crystal display has the advantages of thin thickness and light weight, it is more difficult to achieve large size. At present, it is only suitable for small size daytime surfaces. The plasma display panel has the advantages of light weight, thin thickness, no electromagnetic interference, and large size, which is suitable for medium and large screens. The quality that humans demand for video has turned to high day quality, large screens and

Page 4 516015 V. Description of the invention (2) With the development of the media, a wave of high-quality television (hdtv) cinemas is gradually emerging around the world. In the past, it was mainly used as the negative 3D of the TV and computer screens, the trend of the theater, the TF sentence, and the polarizers of the TV and computer screens, because the electron beams were around the day and the angle of the electron beam was too large. , Making the light emitting point relatively enlarged, causing the corner image to be skewed and the resolution to be worse. In addition, when the size of the cathode ray tube becomes larger, not only the thickness becomes thicker and the volume increases, but also the interior must be kept high. The high-definition screen is difficult to maintain, so it is not suitable for cooperation. In 196, two doctors of DL and H g 〇tt〇W of the University of Illinois published a plasma display surface, a panel, so it has a high resolution, Wide viewing angles, electric field interference, light weight, thin thickness, can achieve large-scale ... Medium and large daytime display. In recent years, Europe and the United States have special advantages, suitable for large sums of money, and advanced countries such as Japan, Japan, Japan, Japan, Japan, Japan and Japan. The development of the device is imperative, and the control circuit required by the power generator needs to be discussed and studied. The circuit is based on the traditional conventional energy recovery circuit. The energy recovery circuit in the case No. 7 Dan 28 belongs to the X-electric L disk γ electric country patent 5,654, which has a recovery function. As shown in Fig. 1, the electrodes can be exchanged components s], s2, s3, s4, and two poles ^ are their Υ recovery circuits, which make the circuit elements on the I electrode side cut; and the switching element 2 inductors Lx, Capacitor c! Is the circuit element of D3, and the inductor Ly, capacitor c2 and other elements I 6, S7, S8, and diode are part of the plasma display panel. The driving timing diagram of the multiplex circuit is See in the picture ^. Figure 2 is the energy return of this circuit. There are 8 516015 in each cycle of this circuit. 5. Description of the invention (3) Different states, but because (υ to (4) and (5) to (8) operate in principle, we will only focus on The first four states are described as follows: The first state is as follows: Energy is recharged to the display panel. The time sequence diagram in Figure 2 is labeled with ⑴. This state is compared with that shown in Figure 3, and the circuit moves to GND. (Ground terminal) —C〗 — & —D —ϊ ^ CP UD, at this time, the inductance Lx and the equivalent capacitance of the display capacitor / display panel have reached "quot; The potential of the pole body is turned on. ^^ \ The body of the body (I: shape V = ^ is turned on, the switching element Γ is turned on = the element & the parasitic diode three (B) itself Π :: 1 has The characteristics of zero-voltage switching are shown in the figure and the vx terminal is clamped to the level of the voltage Vs at this time. The quantity; = 电 ίΐ; is: The state of the label (3), which is mainly able to 2. The circuit is: 彳: ： ，， The circuit operation is shown in Fig. 3 (0. At this time, the inductance is 77. ~ S ~ gnd, when you cut 奂 ^ / piece ?: c: Generate spectral vibration, when the voltage at the terminal drops to zero system at zero The parasitic diode of the voltage standard is turned on, and the voltage at the VX terminal is clamped. Page 6

(4) In the fourth strong state, when ti gVx is clamped to zero, it enters the state indicated by (4) in Fig. 2-i inch will be switched because the parasitic diode of the switching element S2 is turned on: Π2 is turned on), When S4 is turned off (0FF), Wuwu S2 will have zero voltage switching characteristics, as shown in Figure 3 (D). Circuit = The four states described above, should be the energy recovery circuit acting on the X-electrode side 4, f, on the other hand, the energy recovery on the γ-electrode side :: The formula is similar to the X-electrode side, So no more explanation. …, From the United States Patent No. 5 654 798 ¾ & Ann a! Complex circuit related to the energy recovery process! Piao, this -1 way in the energy charging and discharging stress increase, and thunder ## The switching current of the switching element is ugly and the circuit parasitic element has a great effect. (2) Brief description of the invention: The invention of the electronic device is mainly to improve the shortcomings of the circuit mentioned above. # 电 展 显 不The energy recovery of the panel drive circuit ^ Extract the electric path 'time to maintain the original discharge'. Extension 2: Different charging time 3, so that the energy is in the process of withdrawal; panel energy, the influence of circuit parasitic elements. : Peak and subtraction: The original resonance frequency is maintained, but Yu Yudan ^ The second panel still reduces the peak of the resonance current during the charging process. When the :::: is reduced, the resonance frequency is reduced, and the upward / downward current stress and parasitic are reduced)

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V. Description of the invention (5) The effect of the item on the resonance circuit can improve the switching loss, improve the efficiency. The quality factor of the circuit is to achieve the above-mentioned main purpose. In order to achieve the above-mentioned main purpose, the present invention is stored in Xidian No.7 Middle School, and the original circuit architecture is stored in the plasma display factory at the second pole month. Λ: Λ connected to an inductor Li or 1 ^, so as to further reduce the resonance frequency of the switch b during the withdrawal process. Reducing the current stress on the switch and reducing the parasitic component power :: (4) Detailed description of the invention: The invention is a kind of Plasma is the circuit design of the current stress technology that can be stored in the electric switch. Please refer to Figure 4. Figure 4 mainly includes the capable switching circuit, such as pieces S1, s2, s3, s4, 疋 is X- Electricity on the electrode side, S7, S8, and circuit elements on the pole side of the diode D3; circuit, its equivalent panel's power supply is vs. This way, the main can reduce the improvement of loss. And other elements S5 and S6 are Y-electrically equivalent electric voltages Vx and νγ. The energy recovery of the display panel driving circuit is in the process of drawing back the energy of the plasma display panel, and reducing the impact of parasitic elements on the circuit, and can reduce costs and reduce The energy recovery circuit according to the embodiment of the present invention belongs to the X-electrode and the Y-electrode to make energy respectively. The circuit elements shown in Fig. 4 include a pole body h, D2, an inductor L2, and a capacitor q circuit component. In terms of switching elements, E > 4, inductors, and capacitors c2, the middle part is the plasma valley value of the plasma display panel, and the voltage across the capacitor CP is

Page 8 516015

The embodiment of FIG. 4 of the present invention and the conventional technique of FIG. 1 are not clear. The circuits are respectively connected in series to the diode Mσ1) 4: the energy of the V guide panel at and under the spectrum vibrates during the withdrawal process. 'Frequency_ further reduces the current stress on the switch and reduces the influence of parasitic elements. The time gate required for the panel capacitor Cp to charge and withdraw is described by the following two formulas: * Ri Mori (1) ' (2) _

Panel electric valley Cp charging process A = ^ \ fL2CFDF Panel capacitor CP withdrawal process hn ^ L2) C ^ P corresponds to the invention of Fig. 4 四 ψ φ will be widened and a ^ A ^ out of the plasma display panel drive circuit The table dagger is like thunder, so you say + rr 4-@ t 月 agger ^ ^ Invoke · 5¾ Luo Ϊ recovery circuit, its * is the same as the switching element Si, s2, s3 s S :: S gate driver Signal timing state diagram, please refer to Figure 5 and Figure 6: 1 ^ knife for 7G pieces of driving signal signal cycle towel, system, divided into 8-cancer, of which (1) ~ (4) and (5) ~ (8 ) Is similar to the energy recovery state of the dry and Y-electrodes. First, the states ⑴ ~ states, and the illustrations in Figures 6 (A) through 6 (D) are described below: ° (1) The first state: the action of charging energy from Ci to the display panel. The five signs (1) are sad (before (1) state νχ = 〇), as shown in Figure 6 (A), the circuit action path is: GND (ground)-C!-S3-Di -l2 —CP (Plasma display panel equivalent

Fifth, invention ^; capacitor), ς η is salty at this time? β. At the time, the voltage at the terminal of the polar body generated by h and the panel capacitor Cp reaches k '§ The time reaches the half cycle, and the voltage at the terminal h reaches ν σ self-oscillation. When the time reaches half, (2) 苐 丰 ON1 is clamped ⑽: The voltage level of the parasitic voltage of the knife change element shame itself. When the voltage h is clamped to V, #, ^, at this time, because the switching element Ss is too straight into the label in Figure 5, there are several: switching element, conduction, "Guang ~ ~ parasitic diode conduction The characteristics of being switched, as shown in the figure) 'will make S1 reach the voltage level. /, (Β). And at this time, the third edge of' 3 (3): At 1 is saved back to the φ scale. (3) In the state, the main spleen is separated from the inductive and capacitive elements. This is not the case. The circuit operation path is as follows: Eight circuit operations are shown in Figure 6 (C), GND-S6, Cp-L at this time. Outside) with. Generate the spectral vibration / change element s2 switch C ... When the voltage drops to zero, the parasitic diode that cuts off J will not turn on. (4) The fourth state: In the state a, when the circuit Γ is clamped to zero, it enters the state of the symbol (4) in Fig. 5. The circuit diagram is shown in Fig. 6 (D)-"^, the parasitic diode of the team, i At the time of closing, when the switching element core itself (OFF) is closed, ^ 1 switches all the components & conduction (0N), & the end of the pass will have the characteristics of zero voltage switching. Said-forgiveness · This stage is shown in Figure 5. Zhang Q r Q, 1 is stored in the inductor and thunderbolt μ Γ as the state of (3), which is mainly the four states of road and load, which are the energy recovery of the X-electrode side.

Page 10 516015 V. Description of the invention (8) Principle of operation. On the other hand, regarding the one of the γ-electrode side ', (8) The operation method is similar to that of the X-electrode side, and its state is: (the recovery circuit moves), and it is shown in Figure 6 (E) ~ (h) ^ m 彳~,, (5) ~ in the sequence diagram are described as follows: (5) Fifth state: The state of the symbol ⑸ which recharges the energy to the display surface (before the state of (5) ~ action. This is the figure As shown by Fifty-six (E), the circuit action path is: υ The circuit is shown in Figure GND (ground terminal) n board equivalent capacitance) ~ s2—GND. p (At this time, the inductor 3 and the capacitor Cp generate spectral vibration at the time of the display. At that time, the voltage at the voltage vY terminal reaches ς, the period diode is turned on, and the VY potential is clamped by the electric power of the clamp. (6) The sixth State: When the voltage νγ is clamped, the circuit is labeled as shown in Figure 6. The parasitic diode of the Ss itself is turned on. This is because the switching element (ON) and S7 are off (0FF), which will cause s to have Sudden = pieces \ continuity. And this day the terminal is clamped to the special characteristics of Vs f voltage level switching (7) Seventh state: this stage is labeled in Figure 5 (quantity is restored to the state of inductance, thunder & The main U circuit is shown in Figure 6 (G). GND — S2 — CD τη. Jf β car Π + τ, 3 H Κ2 ~ GND. At this time (called) and u produce spectral vibration When the voltage at the νγ terminal drops to zero,

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The parasitic diode of the 7L Se switch is turned on. == State · When νγ is clamped to zero, it enters the state of the symbol (8) in Figure 5 ^, and the circuit diagram is shown in Figure 6 (Η). At this time, the parasitic diode of the switching element 6 is turned on, and it will switch. Element, conduction (ON),

When Ss is turned off (OFF), Se will have the characteristics of zero voltage switching. ^ The above eight state controls are based on controlling the gate control L number of the eight switching elements to achieve control of the switching action sequence of the switching elements in the X-electrode and Y-electrode, which can avoid the hard cutting of the switching element. Switching work loss. Please refer to FIG. 7. FIG. 7 is a diagram illustrating an embodiment in which the inductor and L2 are shared with the iron core and the inductors L3 and L4 are shared with the iron core in the embodiment of the present invention, so as to save the volume and cost of the components. That is, an embodiment in which the inductors L! And 1 ^ 2 and the inductors L3 and h described in the present invention can be independent cores is shown in Fig. 4; or an embodiment in which a common core is shown in Fig. 7 is used. Among them, the inductance when the core is independent = 1; the inductance when the core is common is 1 ^ = 1 ^ and the inductance is the value of L3 to L4. In addition, the “energy recovery circuit” described in the present invention can lengthen the time for which the display unit stored in the electric display panel is drawn back to power to reduce the switching current stress, and at the same time, it can also reduce the scene of the circuit caused by stray components. ^ In this way, the circuit quality factor is improved, and the switching loss is reduced to achieve ^ high efficiency and system reliability. In summary, a driving circuit of an electrically damaged display panel of the present invention

Page 12 516015 V. Description of the invention (ίο) During the withdrawal process of the energy recovery circuit, the impact on the circuit and its efficacy are both current market requirements. According to the law, the scope of the patent cannot be used to limit the scope of the patent. To pray. This can make this circuit store the energy stored in the plasma display panel, effectively reduce the current stress on the switch, reduce parasitic elements, and reduce > switching losses. Fully show :! Progressive implementation, extremely industrial use = New inventions that you can see $ i are fully in line with the invention patent ί, only for the preferred embodiment of the present invention, together :: implemented Range. That is, according to the second issue, I would like to change-ί ϊ ί, should still belong to the present invention; ° »Yuebei review committee Ming Jian, and pray for the best, is on page 13 516015 The diagram is a simple illustration Circuit diagram of energy recovery for conventional technology. Figure 3 shows the energy recovery circuit driver of conventional technology. Figure 3 (A) shows the sequence diagram of the energy recharge temple in conventional technology. Illustration. 4 The lightning of the non-panel Figure 2 (B) is the circuit operation diagram of the energy recovery circuit action of the conventional technology. During the movement, the end clamp is shown in Figure 技术. The circuit operation of the component :: The circuit operation of the energy recovery of the conventional technology Figure 4 :: The circuit operation diagram of the circuit. > Middle, end-clamped Fig. 5 # Λ Energy recovery circuit of the embodiment of the invention Fig. 5 is a diagram of the present invention. Fig. 6 (A) is a diagram showing the state of the X-electrode energy reordering in the X-moon embodiment of the present invention when the recovery circuit is driven by applying the recovery circuit. Circuit operation diagram. Recharging to the display panel (/) (B) is the X-electrode energy X in the example of V-Protector and Shi Mingming in the example, and it is broken into the vs. circuit to restore the circuit. Figure 6 (C ) Is a fun road action diagram of the present invention. The circuit of the part is moved by the electrode energy pomelo in the example, and the circuit operation diagram. Drawing back to the energy storage element Figure 6 (D) is the energy recovery circuit of the νχ terminal of the invention clamped to zero: the electrode of the dagger electrode, and Figure 6 (E) is the operation diagram of the invention. Circuit operation diagram. The energy recharge of one electrode in J is displayed on the display panel. Fig. 6 (F) is the energy recovery circuit of the Y-electrode in the conventional example. ----- Page 14516015 Brief description of the diagram νγ The terminal is clamped to the circuit action diagram of vs. Figure 6 (G) is a circuit operation diagram of the Y-electrode energy drawn back to the energy storage element in the embodiment of the present invention. FIG. 6 (H) is a circuit operation diagram of the Y-electrode energy recovery circuit in which the VY terminal is clamped to zero in the embodiment of the present invention. FIG. 7 is a circuit diagram of the energy recovery of the common iron core according to another embodiment of the present invention.

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Claims (1)

516015 VI. Scope of patent application ^ 1 An energy recovery circuit of a plasma display panel driving circuit The energy recovery circuit architecture is changed, in which eight ^ are mainly connected to form the equivalent capacitance of the electro-forged display panel. The element voltage is vx and νγ, and two inductors are connected in series. The inductance is Li and m 彳 terminal power L4, which are matched with the equivalent capacitance Cp of the panel and transmitted as energy 2 to the 3 spot exchange element to perform the stored energy. The person who draws the power back will transfer the energy of the eight switching elements to drive the control signal of the eight switching elements to transfer the energy stored in the LED and display panel drive circuit back to the power%. R ", 'Page 2 · An energy recovery circuit for an electrically destroyed display panel drive as described in item 丨 of the patent application range, wherein the inductors Li and ^ and the capacitors L3 and L4 are independent iron cores, and the inductance The embodiment of the value is / L2 = / L4. 3. The energy recovery circuit of the driving circuit of a plasma display panel as described in item 丨 of the patent application scope, wherein the inductances Li and! ^ And the inductance B3 and L4 is a common iron core, and the inductance value is Li = L2 and [1 square. With% 4 · As an energy recovery circuit of a plasma display panel driving circuit as described in the item of the formula ^ Lee range, where said The eight switching elements are controlled to eight states in each cycle of the driving signal, of which four are cut, and the &, SS, and S4 elements are all X-electrode parts, and their energy recovery states are four. These states are states one to four, and the other four 2 516015 6. Scope of patent application —___ ^ The switching element, sG, s ?, and ss are Y-electrode parts, which can be used. There are four states in the complex state, which are states. Five to eight. Back here 5. If the scope of patent application is the fourth item The energy recovery circuit of the plasma display surface circuit described above, wherein the four states of the X-electrode part t-density region electrodynamic state are respectively: Here, the first state is restored ... The energy is recharged to the display panel This action < resonates with the electric valley Cp, and at half the period, the switching, parasitic diode of the inductor ^ itself is turned on, and the νχ potential is clamped in the voltage level of the power source vs. the second state: When the voltage Vx is clamped to Vs, the switching element 3 is turned on, 7 ^ is turned on (ON), and Ss is turned off (0FF) because the parasitic diode of the cutting element \ is turned on, so that \ has the characteristics of zero voltage switching 'And at this time the vx terminal is clamped to the power supply Vs voltage level first state: energy is stored back into the inductor and capacitor elements,' at this time (^ 乩 2) resonates with Cp, when the voltage at the νχ terminal drops to At zero, the parasitic diode of the switching element S2 itself is turned on. When the νχ is clamped to zero, the parasitic diode of the switching element 2 is turned on at this time, and the switching element s is turned on (^), s, cut-off (0FF), will make & have the special power of zero voltage 2 switching. For example, the energy recovery circuit of the fourth circuit of the scope of patent application, a kind of plasma display panel driving electric power described in the above item, wherein the energy of the γ-electrode part is recovered 516015. The four states of the six patent application states are the fifth state. : More than 7 τ Μ Feng " b I recharge to the display surface handle + * h and the capacitor CP resonate, when it arrives, the voltage at the terminal vY of the inductor reaches the power supply Vs, cut, and then the voltage is 2 The polar body is turned on, and v and _S5 are in the middle; the Y potential is clamped to the voltage level of Vs. The sixth state: f voltage νγ is clamped to \ 'when the parasitic diode of Ss itself is turned on due to the switching element. ^ 面 ^ 切 贿), will lead to ~ r :: In other words, the 'end is clamped at this time ^ Seventh state: it is to store energy back to the inductor, electricity (^ 4) and (; produce various vibrations, when At this time, the voltage of the switching element & the parasitic diode 7 of the eighth λτ is sweetened to zero. At this time, the parasitic diode of the switching element 6 is turned on, and the switching element s is turned on. , G, and cut-off (M10 'will make S6 have zero electricity and 6 voltages. " The energy recovery circuit of the plasma circuit described in item 4 further includes drawing back the energy stored in the electric dry electricity display unit to the power source for a longer time, thereby reducing: = current stress and reducing the impact of stray components on the circuit By. Page 18