JP4385105B2 - Discharge ignition device - Google Patents

Description

  The present invention relates to a discharge ignition device. More specifically, the present invention relates to a discharge ignition device suitable for use as a trigger or a switch such as a lightning arrester or an ignition device.

  Conventionally, there is a three-point gap type impulse voltage generator as a discharge ignition device using a discharge phenomenon accompanied by dielectric breakdown. As shown in FIG. 10, this three-point gap type discharge ignition device includes a three-point gap 104 including a trigger electrode 101 and a pair of main electrodes 102 and 103, and a CR circuit having a capacitor 105 and a resistor 106. It is configured. A gap 107 that forms a discharge path is provided between the main electrodes 102 and 103, and a gap 108 that is much shorter than the gap 107 is provided between the main electrode 102 and the trigger electrode 101. Is provided. The resistor 106 is a variable resistor, and the time constant CR determined by the resistor 106 and the capacitor 105 can be adjusted. By closing the switch 109, the capacitor 15 is charged through the resistor 106, and a high voltage is applied between the trigger electrode 101 and the main electrode 102.

  In the three-point gap 104 portion, first, a dielectric breakdown serving as a trigger is caused between the trigger electrode 101 and the main electrode 102, whereby initial electrons are generated between the main electrodes 102 and 103, and the main electrode 102, 103 is caused to cause dielectric breakdown.

"High Voltage Test Handbook" The Institute of Electrical Engineers of Japan, March 30, 1983, p. 66

  However, in the above-mentioned three-point gap device, the capacitor 105 is charged through the resistor 106 after the switch 109 is turned on, and a high voltage pulse is output between the trigger electrode 101 and the main electrode 102. There is a problem that CR delay occurs and the response is extremely slow.

  An object of this invention is to provide the discharge ignition device which can generate a dielectric breakdown and partial discharge rapidly.

  In order to achieve such an object, a discharge ignition device according to claim 1 is configured such that when a high voltage is applied, a sub-trigger electrode system that causes dielectric breakdown between the electrodes and a high voltage between the electrodes of the sub-trigger electrode system are provided. The main trigger electrode is provided with a high voltage applying means to be applied and a main trigger electrode system that conducts by dielectric breakdown generated in the sub-trigger electrode system and generates dielectric breakdown between the electrodes. It causes system breakdown.

  Therefore, when a high voltage is applied to the electrodes of the sub-trigger electrode system by the high-voltage applying means, dielectric breakdown (first-stage dielectric breakdown serving as a sub-trigger) occurs between the electrodes of the sub-trigger electrode system, and the discharge resistance A voltage corresponding to the shared voltage is applied to the main trigger electrode system, and dielectric breakdown (second-stage dielectric breakdown serving as the main trigger) occurs between the electrodes of the main trigger electrode system. Because initial electrons, ions, and discharge degradation products are generated by this second stage breakdown, for example, by placing the electrode of the main trigger electrode system in the vicinity of the discharge gap that generates another breakdown, The second level dielectric breakdown triggers another breakdown in the discharge gap. Here, the high voltage means a voltage that causes at least dielectric breakdown between the sub-trigger electrodes.

Further, in the discharge ignition device according to claim 2, the sub-trigger electrode system is capable of adjusting a gap between the first and second electrodes disposed opposite to each other and between the first and second electrodes. Rutotomoni comprising a third electrode disposed in the low potential side of the electrode conducting with the electrode of the third includes the main trigger electrode system, high in the first and second electrodes by a high voltage application means By applying a voltage to cause a first-stage dielectric breakdown between the first and second electrodes of the sub-trigger electrode system and raising the potential of the third electrode, an electrode on the low potential side of the main trigger electrode system Is caused to cause dielectric breakdown of the main trigger electrode system .

  Therefore, when the position of the third electrode is changed with respect to the first and second electrodes, the shared voltage due to the discharge resistance between the first and second electrodes changes, and the potential of the third electrode is adjusted. be able to.

  As described above, the second-stage dielectric breakdown may be generated in the electrode of the main trigger electrode system for another dielectric breakdown trigger. However, as the excitation discharge, the second-stage dielectric breakdown and A partial discharge may be generated.

  Thus, according to the discharge ignition device of the first aspect, the dielectric breakdown can be quickly generated.

  Further, in the discharge ignition device according to claim 2, since the potential of the third electrode when the first stage dielectric breakdown occurs can be adjusted, the potential of the positive electrode of the main trigger electrode system is adjusted. It is possible to adjust the voltage causing breakdown of the second stage. For example, when the high voltage applied to the first and second electrodes of the sub-trigger electrode system by the high voltage applying means is relatively low (when the overvoltage is small), the discharge resistance is adjusted by adjusting the position of the third electrode. The potential of the third electrode can be increased by increasing the shared voltage by the voltage, thereby increasing the potential of the electrode on the low potential side of the main trigger system to an appropriate value to facilitate the firing of the main trigger electrode system. be able to. On the other hand, when the high voltage applied to the first and second electrodes of the sub-trigger electrode system by the high voltage applying means is relatively high (when the overvoltage is large), the discharge resistance is adjusted by adjusting the position of the third electrode. The potential of the third electrode can be lowered by lowering the voltage shared by the second electrode, thereby preventing the potential of the electrode on the low potential side of the main trigger electrode system from becoming excessive and the second stage with an appropriate potential difference. Dielectric breakdown can occur. Moreover, the burning of an electrode can be reduced.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

FIG. 1 shows an example of an embodiment of a discharge ignition device to which the present invention is applied. The discharge ignition device 1 includes a sub-trigger electrode system 12 that causes dielectric breakdown between electrodes when a high voltage is applied, a high-voltage applying unit 3 that applies a high voltage between the electrodes of the sub-trigger electrode system 12, A main trigger electrode system 11 that conducts by a dielectric breakdown generated in the sub trigger electrode system 12 and generates a dielectric breakdown between the electrodes, and uses the dielectric breakdown generated in the sub trigger electrode 12 to perform a dielectric breakdown of the main trigger electrode system 11 It is what is generated. In this embodiment, the sub-trigger electrode system 12 can adjust the gap with respect to these electrodes 8 and 9 between the first and second electrodes 8 and 9 disposed opposite to each other and the first and second electrodes. An arranged third electrode 4 (hereinafter simply referred to as electrode 4) is provided, and a high voltage is applied to the first and second electrodes 8 and 9 (hereinafter simply referred to as electrodes 8 and 9) by the high voltage applying means 3. Then, by causing a first-stage dielectric breakdown between the first and second electrodes 8 and 9 of the sub-trigger electrode system 12, an electrode 5 on the low potential side of the main trigger electrode system 11 (hereinafter simply referred to as electrode 5). The electrical trigger of the main trigger electrode system 11 is generated .

  In the present embodiment, the sub-trigger electrode system 12 is composed of the electrodes 8 and 9 disposed opposite to each other and the electrode 4 disposed between the electrodes 8 and 9. The electrodes 8 and 9 are electrodes on the high voltage applying means 3 side connected to the high voltage applying means 3. On the other hand, the electrode 4 is an electrode that is not connected to the high voltage applying means 3 unless the first stage dielectric breakdown occurs. Further, the main trigger electrode system 11 is composed of electrodes 5 and 6 arranged to face each other. The electrode 6 is an electrode on the ground side, and the electrode 5 is an electrode on the opposite side to the ground side.

  The gap length between the electrodes 8 and 9 of the sub-trigger electrode system 12 is set to a length that causes dielectric breakdown at a high voltage applied by the high voltage applying means 3. The gap length between the electrodes 5 and 6 of the main trigger electrode system 11 is set to a length that causes dielectric breakdown when the potential of the electrode 5 rises due to dielectric breakdown of the sub trigger electrode system 12.

  The high voltage applying means 3 is a pulse generator using an induction coil used for observing a vacuum state, and applies a high voltage that causes dielectric breakdown between the electrodes 8 and 9 of the sub trigger electrode system 12. For example, an impulse voltage, a surge voltage, a DC voltage, a pulse voltage, or the like is output by operating a switch means (not shown) or inputting a signal. Here, it is the pulse voltage of the high voltage high frequency power supply. As the high voltage applying means 3, for example, a non-gap impact voltage generating device disclosed in Japanese Utility Model Publication No. 7-42235 can be used.

  The electrode 4 of the sub trigger electrode system 12 and the electrodes 5 and 6 of the main trigger electrode system 11 are, for example, needle electrodes. The electrode 6 is grounded. The electrodes 8 and 9 of the sub trigger electrode system 12 are, for example, a rod electrode, a sharp tip electrode, a protrusion, or a line electrode. In the present embodiment, the electrode 4 of the sub-trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 are physically connected by the conductor 7.

  The electrode 4 of the sub-trigger electrode system 12 is separated from the electrode 8 and the electrode 9 and is insulated. The electrode 5 of the main trigger electrode system 11 is separated from the electrode 6 and is insulated. Therefore, the impedance of the conductor 7 is infinite when viewed from the electrodes 8 and 9 side of the sub trigger electrode system 12 and from the electrode 6 side of the main trigger electrode system 11. The electrode system and the electrode system on the electrode 6 side are separated. By being separated in this way, insulation is maintained, so that a high voltage can be used as the high voltage applying means 3. In addition, by adjusting the gap length between the electrodes 8 and 9, it is possible to adjust the voltage that can cause the first stage dielectric breakdown, and to adjust the gap length between the electrodes 8 and 4. Accordingly, it is possible to adjust the discharge probability that causes the second-stage dielectric breakdown. Moreover, since it is separated from the circuit and does not become a resistor, no loss occurs.

  When a high voltage is applied to the electrodes 8 and 9 of the sub-trigger electrode system 12 by the high voltage applying means 3, a first-stage dielectric breakdown occurs between the electrodes 8 and 9. Since the electrode 4 is arranged between the electrodes 8 and 9, the potential of the electrode 4 corresponds to the potential corresponding to the gap length between the electrodes 8 and 4, that is, the voltage shared by the discharge resistance between the electrodes 8 and 9. Rise to potential. Therefore, the potential of the electrode 5 of the main trigger electrode system 11 connected to the electrode 4 by the conductor 7 also rises, and a second-stage dielectric breakdown occurs with the electrode 6. Initial electrons, ions, and discharge deterioration products can be generated between the electrodes 5 and 6 by the second-stage dielectric breakdown.

  In addition, by adjusting the position of the electrode 4 with respect to the electrodes 8 and 9 of the sub-trigger electrode system 12, the potential of the electrode 4 when the first stage dielectric breakdown occurs between the electrodes 8 and 9 can be adjusted. . Thereby, the electric potential of the electrode 5 of the main trigger electrode system 11 can be adjusted, and the discharge probability causing the second-stage dielectric breakdown can be adjusted.

  For example, when the high voltage applied by the high voltage applying means 3 is relatively low (when the overvoltage is small) or the like, the voltage shared by the discharge resistance between the electrodes 4 and 8 can be obtained by bringing the electrode 4 closer to the electrode 8, for example. Can be increased to increase the potential of the electrode 4. As a result, the potential of the electrode 5 of the main trigger electrode system 11 can be raised to an appropriate value to increase the potential difference between the electrode 6 and the high voltage applied by the high voltage applying means 3 is overvoltage. Even if it is small, it is possible to reliably generate the second-stage dielectric breakdown by increasing the discharge probability.

  On the other hand, when the high voltage applied by the high voltage applying means 3 is relatively high (when the overvoltage is large) or the like, the electrode 4 is moved away from the electrode 8, for example, so that the voltage shared by the discharge resistance between the electrodes 4 and 8 is reduced. To lower the potential of the electrode 4. Thereby, it is possible to prevent the potential of the electrode 5 of the main trigger electrode system 11 from becoming excessively large and to reduce the potential difference between the electrode 6 and the high voltage applied by the high voltage applying means 3 is large in overvoltage. Even if it is a thing, the dielectric breakdown of the 2nd step | paragraph can be reliably generated by making discharge probability high. Moreover, the burning of the electrodes 5 and 6 can be reduced.

  In order to reduce the burning of the electrodes 5 and 6, it is possible to put a high resistance in series with the conductor 7.

  The second stage breakdown may be generated for the purpose of generating initial electrons, ions, and discharge degradation products, but the second stage breakdown may be generated as an excitation discharge.

  In addition, since ions, electrons, and discharge degradation products are generated due to dielectric breakdown, they may be used as these manufacturing apparatuses. The type of discharge deterioration product that can be generated depends on the atmosphere in which the main trigger electrode system 11 is disposed. For example, if the atmosphere is air, discharge deterioration products such as nitrogen oxide and ozone can be produced.

  In the discharge ignition device 1, the potential of the electrode 4 of the sub-trigger electrode system 12 is raised by causing the first stage of dielectric breakdown, and thereby the potential of the electrode 5 of the main trigger electrode system 11 is also raised to be two-stage. Since the second dielectric breakdown is caused, the second-stage dielectric breakdown can be caused at a position away from the first-stage dielectric breakdown.

  Further, since the discharge ignition device 1 does not have a structure in which electric charges are accumulated in a capacitor to cause dielectric breakdown as in a CR circuit, for example, dielectric breakdown may occur in a time corresponding to the discharge delay time. it can. That is, after the first stage dielectric breakdown occurs, the second stage dielectric breakdown can be caused quickly.

  Further, by adjusting the gap length between the electrodes 8 and 9 of the sub-trigger electrode system 12, it is possible to adjust the voltage that causes the first stage dielectric breakdown.

  The high voltage applying means 3 is not limited to a high voltage high frequency power source. For example, a DC voltage or a pulse voltage may be used, or a surge voltage, an impulse voltage, an inverter surge voltage, or the like superimposed on the power supply line may be used as it is or at a high voltage such as the pulse generator 10 shown in FIG. It may be converted and applied to cause dielectric breakdown. Since the discharge ignition device 1 can quickly cause dielectric breakdown as described above, it can cope with surge voltages such as inverter surges and lightning surges, for example.

  For example, the discharge ignition device 1 can be combined with a lightning arrester to form a steep wave suppressing device. That is, the discharge ignition device 1 can be used as a trigger device for a lightning arrester. FIG. 2 shows a steep wave suppressing device to which the discharge ignition device 1 is applied.

  The steep wave suppressing device mainly includes a pulse generator 10, a main trigger electrode system 11, a sub trigger electrode system 12, and a main electrode 13.

  The main electrode 13 is composed of electrodes 6 and 16 that form a gap 15 of the lightning arrester 14. The electrode 6 of the main trigger electrode system 11 of the discharge ignition device 1 is also the ground-side electrode 6 of the lightning arrester 14. The electrodes 4 and 8 of the sub trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 are, for example, needle electrodes, and the electrodes 6 and 16 of the main electrode 13 are, for example, spherical electrodes.

  In the steep wave suppression device of FIG. 2, the gap length between the electrodes 8 and 4 of the sub trigger electrode system 12 is made shorter than the gap length between the electrodes 9 and 4, and one step between the electrodes 8 and 9 is caused by the penetration of the steep wave. When the second dielectric breakdown occurs between the electrodes 5 and 6 of the main trigger electrode system 11 due to the occurrence of the dielectric breakdown of the eyes, the electrodes 8 and 4 are electrically connected. The steep wave is a very short time, and the first stage dielectric breakdown occurs only while the steep wave is flowing.

  The gap length between the electrodes 8 and 9 of the sub-trigger electrode system 12 is set to such a length that does not cause dielectric breakdown at a normal voltage and causes dielectric breakdown only when a steep wave voltage to be suppressed is applied. ing. The gap length between the electrodes 5 and 6 of the main trigger electrode system 11 is set to a length that causes dielectric breakdown when the potential of the electrode 5 rises due to dielectric breakdown of the sub trigger electrode system 12. If the first trigger breakdown can be generated by the sub trigger electrode system 12 and the second trigger breakdown can be generated by the main trigger electrode system 11, the sub trigger electrode system 12 can be connected between the electrodes 8 and 9. The gap length may be shorter than the gap length between the electrodes 5 and 6 of the main trigger electrode system 11, or vice versa.

  The pulse generator 10 is shown in FIGS. The pulse generator 10 is, for example, a cylindrical air-core pulse generator, and includes a primary side winding 17 in which a conductive foil is bent into a cylindrical shape, and a secondary side winding 18 disposed inside the primary side winding 17. ing. The primary winding 17 is, for example, a soft aluminum foil, and is interposed on the power supply 27 side with respect to the load 20. The secondary winding 18 is a coil in which, for example, enameled wire is wound a predetermined number of times, and both ends 18 a and 18 a are connected to the first electrode 8 and the second electrode 9. The primary winding 17 and the secondary winding 18 are insulated by an insulating paper 19. When a current flows through the primary winding 17, a voltage higher than that voltage can be output from the secondary winding 18. The primary winding 17 may be a conductive plate such as a copper plate.

  As the pulse generator 10, for example, the use of a cylindrical pulse generator disclosed in Japanese Patent Application Laid-Open No. 2001-313217 is suitable.

  The conductor 7 connecting the electrode 4 of the sub trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 is, for example, a lead wire. One of the features of this steep wave suppressing device is that the conductor 7 is not connected in the entire circuit configuration. For this reason, the impedance between the pulse generator 10 and the ground electrode (the electrode 6 of the main trigger electrode system 11) is infinite. Therefore, even if a small noise containing a high frequency component flows into the primary winding 17 of the pulse generator 10, a voltage is applied to the conductor 7 if no dielectric breakdown occurs between the electrodes 8 and 9 of the sub trigger electrode system 12. It will not be done. For this reason, the main trigger electrode system 11 is not affected, and the safety can be further improved. Further, by separating the impedance between the pulse generator 10 and the ground electrode by making the impedance infinite, it is possible to safely use a high voltage as the voltage applied to the sub trigger electrode system 12. That is, it can be safely operated even at a high voltage. Furthermore, electricity can be prevented from flowing through the conductor 7, and since it is cut off on the circuit and does not become a resistor, a pulse is generated only when a surge voltage such as a lightning surge voltage flows without affecting the commercial power supply or load. A voltage can be generated and fired reliably using a surge voltage.

  A commercial frequency power supply 27 is connected to the circuit. However, when power is supplied from the power supply 27, the first-stage discharge (insulation breakdown) does not occur in the sub-trigger electrode system 12, and it is caused by a lightning strike or the like. A high-voltage, high-frequency pulse generated in the pulse generator 10 due to intrusion of a surge voltage, an inverter surge voltage or the like is applied between the electrodes 8 and 9 to cause first-stage breakdown. That is, in this case, the surge voltage and the pulse generator 10 that converts the surge voltage into a high-frequency high-frequency pulse voltage are the high-voltage applying means 3 that generates discharge. Further, since the sub trigger electrode system 12 and the main trigger electrode system 11 are connected by the conductor 7, the sub trigger electrode system 12 and the main trigger electrode system 11 can be installed separately. That is, the first stage dielectric breakdown portion that becomes a sub-trigger using the surge voltage and the lightning arrester 14 that has a large capacity can be installed separately, for example, on the ground and on a steel tower. Even if a high voltage of about 1,000 to several hundred thousand volts is applied, it can be used safely. In this case, the conductor 7 needs to be insulated for safety.

  As shown in FIG. 5, when the surge voltage 3 that has entered the circuit due to a lightning strike, switching operation, or the like flows into the primary winding 17 of the pulse generator 10, a magnetic flux is generated according to Ampere's law. When this magnetic flux interlinks with the secondary winding 18, a large voltage is generated at the output end according to Faraday's law of electromagnetic induction. When this voltage is applied to the electrodes 8 and 9 of the sub-trigger electrode system 12 connected to the output terminal, a first stage dielectric breakdown 28 occurs, and the dielectric breakdown 28 increases the potential of the electrode 4. The potential of the electrode 5 of the main trigger electrode system 11 also rises, causing dielectric breakdown (second-stage dielectric breakdown 29) between the electrodes 5 and 6. This second-stage dielectric breakdown 29 becomes a trigger, and the dielectric breakdown occurs between the main electrodes 13 to cause a short circuit. Therefore, the overvoltage pulse voltage that enters the circuit and flows to the load 20 is suppressed.

  Initial electrons, ions, and discharge deterioration products 30 (hereinafter referred to as initial electrons 30) are generated between the main electrodes 13 due to the second-stage dielectric breakdown 29 in the main trigger electrode system 11. For this reason, the discharge probability (probability that the dielectric breakdown 31 occurs) is increased, and the overvoltage can be reduced. Therefore, it is possible to reduce the overvoltage pulse voltage 3 that has entered the circuit and suppress the influence on the load 20. In addition, since the initial electrons 30 are generated, even if the main electrode 13 is provided in the sealed space 32, the dielectric breakdown (discharge) 31 can be quickly generated, and the variation in the discharge start voltage, that is, the standard deviation can be reduced. Can be small.

  Further, since the overvoltage pulse 3 can be reduced and suppressed, it is possible to cope with intrusion of lightning surge voltage, inverter surge voltage, and the like.

  Further, since the pulse generator 10 outputs a voltage higher than the voltage of the primary winding 17 from the secondary winding 18, the first stage breakdown 28 and the second stage with a pulse voltage higher by that amount. The dielectric breakdown 29 can be generated. That is, since the second stage dielectric breakdown 29 can be generated with a high pulse voltage, the dielectric breakdown 31 in the main electrode 13 can be reliably caused.

  Furthermore, by adjusting the gap length between the electrodes 8 and 9 of the sub-trigger electrode system 12, the voltage causing the first stage dielectric breakdown 28 can be adjusted, and the position of the electrode 4 can be adjusted. By adjusting the gap length between the electrodes 8 and 4, the potential of the electrode 5 of the main trigger electrode system 11 can be adjusted, and further, the gap length between the electrodes 5 and 6 of the main trigger electrode system 11 is adjusted. As a result, the voltage causing the second-stage dielectric breakdown 29 serving as a trigger, that is, the steep wave suppressing device is activated, and the dielectric breakdown probability between the main electrodes 16 and 6 can be adjusted.

  Moreover, you may use the discharge ignition apparatus 1 to operate the discharge (dielectric breakdown) required for light emission of the cell (pixel) of the glass substrate of a plasma display, for example. FIG. 6 shows an example of the cell 26 of the glass substrate 21 of the plasma display. For example, a data electrode 23, a scanning electrode 24, and a sustain electrode 25 are incorporated in the glass substrate 21 of the plasma display in order to cause the phosphor 22 to emit light, and charges are applied to the electrodes 23 to 25 in a predetermined order. The desired discharge is caused sequentially. In the present invention, an unillustrated trigger electrode (the electrode 5 of the main trigger electrode system 11) is provided for each cell 26, and this trigger electrode and any one of the electrodes 23 to 25 (the electrode of the main trigger electrode system 11). The second stage discharge (dielectric breakdown) 29 is generated as a trigger for the discharge (dielectric breakdown) 31. Thus, the discharge ignition device 1 of the present invention can also be used as a trigger device for an ignition device of a plasma display.

  Moreover, you may use the discharge ignition apparatus 1 of this invention as a trigger apparatus of the ignition circuit of a cold cathode discharge tube. FIG. 7 shows a discharge ignition device 1 used as a trigger device for the ignition circuit of the cold cathode discharge tube 33. By using the discharge ignition device 1, it is possible to simplify the structure for causing dielectric breakdown that triggers the ignition circuit of the cold cathode discharge tube 33.

  Moreover, you may use the discharge ignition apparatus 1 of this invention as a trigger apparatus of a filamentless fluorescent lamp. Further, the discharge ignition device 1 of the present invention may be used as an ignition device such as a boiler, an ignition device such as a stove, an ignition device of an internal combustion engine, an excitation discharge device, or the like. When used as an ignition device for an internal combustion engine, the main trigger electrode system 11 is disposed in the vicinity of the discharge gap of the spark plug so as to generate a second stage breakdown as a trigger for the discharge of the spark plug. To do. In addition, when there are a plurality of spark plugs in one cylinder of the internal combustion engine, an electrode 5 is provided for each spark plug and connected in parallel to the sub trigger electrode 12, and the first stage of the sub trigger electrode system 12 is connected. It is possible to raise the potential of each electrode 5 simultaneously by dielectric breakdown to cause a second level dielectric breakdown.

  Furthermore, the discharge ignition device 1 of the present invention can be used as a trigger device for devices and devices that cause dielectric breakdown and discharge in addition to the devices and devices described above.

  When the electrodes 16 and 6 of the main electrode 13 are switches, the discharge ignition device 1 can be a device that closes the switch.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above description, the electrode 4 of the sub trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 are physically and electrically connected by the conductor 7. One or two or more gaps through which electricity can be conducted are provided, and the state may be physically and electrically cut off (connected in a broken line). That is, the conductor 7 is divided into a plurality of parts and a gap 34 is provided between them (FIG. 8), or a gap is provided between the conductor 7 and the electrode 4 or the electrode 5 so that the sub-trigger electrode is formed by the first stage dielectric breakdown. When the potential of the electrode 4 of the system 12 rises, the electrode 4 of the sub trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 may be made conductive by causing dielectric breakdown in the gap of the conductor 7. . In other words, when the first stage dielectric breakdown occurs, the electrode 4 of the sub trigger electrode system 12 and the electrode 5 of the main trigger electrode system 11 may be electrically connected. By doing in this way, in the state where the first-stage dielectric breakdown has not occurred, the insulation separation between the sub trigger electrode system 12 and the main trigger electrode system 11 can be further ensured.

  In the above description, the electrodes 4 to 6 are needle electrodes, but are not necessarily limited to needle electrodes. Further, although the electrodes 8 and 9 are line electrodes, they are not necessarily limited to line electrodes.

  Furthermore, in the above description, the sub-trigger electrode system 12 is composed of the three electrodes 4, 8, and 9. However, the sub-trigger electrode system 12 is not necessarily composed of the three electrodes 4, 8, and 9, You may make it comprise from two electrodes or four or more electrodes. FIG. 11 shows an example in which the sub trigger electrode system 12 is composed of two electrodes 4 and 8. The sub trigger electrode system 12 includes an electrode 8 on the high voltage applying means 3 side and an electrode 4 on the opposite side to the high voltage applying means 3 side. Also in this case, when a high voltage is applied to the sub-trigger electrode system 12 by the high-voltage applying means 3, a first-stage dielectric breakdown occurs between the electrodes 8 and 4 of the sub-trigger electrode system 12, thereby causing the main trigger electrode system The potential of the eleventh electrode 5 rises, and a second-stage dielectric breakdown can be generated between the electrodes 5 and 6. In the discharge ignition device 1 of FIG. 11, the configuration is simplified and the number of components is reduced by a smaller number of electrodes of the sub trigger electrode system 12 than the discharge ignition device 1 of FIG. 1.

  An experiment was conducted to confirm that dielectric breakdown can be caused by the discharge ignition device 1 shown in FIG.

  A spherical electrode (made of stainless steel, diameter 25.4 mm) was used as the electrode 5 of the main trigger electrode system 11. As the electrodes 8, 9, 4 of the sub trigger electrode system 12 and the electrode 6 of the main trigger electrode system 11, needle electrodes (gas needle No. 2, thickness 0.76 mm, length 54.5 mm) were used. In the experiment, a pulsed voltage (period 5 μs) of a maximum 8.7 kV damped oscillation waveform was applied between the electrodes 8 and 9 of the sub-trigger electrode system 12 by the cylindrical air-core pulse generator 10. The distance between the electrode 8 and the electrode 9 of the sub-trigger electrode system 12 is about 2 mm, the electrode 4 of the sub-trigger electrode system 12 is placed at a right angle in the middle of the gap 2, and the tip of the electrode of the sub-trigger electrode system 12 Arranged so as to protrude beyond a virtual line connecting the tips of 8 and 9.

  The gap length between the electrode 5 and the electrode 6 of the main trigger electrode system 11 was set to 50 μm. The voltage between the electrodes 5 and 6 of the main trigger electrode system 11 was measured with a high voltage probe (not shown). The experiment was performed in the air without irradiation.

  The measurement results are shown in FIG. As is clear from FIG. 9, it was confirmed that the maximum voltage of 5.56 kV was generated between the electrodes 5 and 6 of the main trigger electrode system 11. Further, it was confirmed by visual observation that a spark discharge occurred between both electrodes 5 and 6.

  As a result, the voltage of the electrode 4 of the sub-trigger electrode system 12 disposed in the first-stage discharge (dielectric breakdown) space (gap 2) is separated from the second-stage insulation by another electrode system at a position separated as a high voltage application means. The breakdown 29 can be caused, and it was confirmed that even when another electrode system was arranged in the sealed space, it was easy to ignite discharge (insulation breakdown) in the sealed space.

It is a circuit diagram showing a 1st embodiment of a discharge ignition device of the present invention. It is a circuit diagram which shows an example of the steep wave suppression apparatus provided with the discharge ignition device of this invention. It is the schematic block diagram which looked at the cylindrical air-core pulse generator from the side. It is a perspective view of the state where a schematic structure of a cylindrical air core pulse generator was shown and the primary side coil was partly removed. It is a circuit diagram which shows the action | operation of a steep wave suppression apparatus. It is sectional drawing which shows an example of the cell of the glass substrate of the plasma display provided with the discharge ignition device of this invention. It is a circuit diagram which shows an example of the ignition circuit of the cold cathode discharge tube provided with the discharge ignition device of this invention. It is a circuit diagram which shows 2nd Embodiment of the discharge ignition device of this invention. It is a figure which shows the voltage waveform between the 4th electrode of FIG. 1, and a 5th electrode. It is a circuit diagram which shows the conventional three-point gap apparatus. It is a circuit diagram which shows 3rd Embodiment of the discharge ignition device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Discharge ignition device 3 High voltage application means 4, 8, 9 Electrode 5, 6 of sub trigger electrode system 7 Electrode of main trigger electrode system 7 Conductor

Claims (2)

  A sub-trigger electrode system that causes dielectric breakdown between electrodes when a high voltage is applied, a high-voltage applying means that applies a high voltage between the electrodes of the sub-trigger electrode system, and a dielectric breakdown that occurs in the sub-trigger electrode system A main trigger electrode system that is electrically connected to each other and causes dielectric breakdown between the electrodes, and uses the dielectric breakdown generated in the sub-trigger electrode system to cause dielectric breakdown of the main trigger electrode system. apparatus. The sub trigger electrode system, Ru comprises a first and a second electrode disposed to face the third electrode, which is adjustably disposed gaps for these electrodes between the first and second electrodes In addition, the main trigger electrode system is provided with a low potential side electrode that is electrically connected to the third electrode, and a high voltage is applied to the first and second electrodes by the high voltage applying means, so that the sub trigger electrode system is provided. Causing the first stage dielectric breakdown between the first and second electrodes to raise the potential of the third electrode, thereby raising the potential of the electrode on the low potential side of the main trigger electrode system. The discharge ignition device according to claim 1 , wherein dielectric breakdown of the main trigger electrode system is generated .

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