CN111010792A - Rotary plasma jet trigger device and trigger method - Google Patents
Rotary plasma jet trigger device and trigger method Download PDFInfo
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- CN111010792A CN111010792A CN201911247213.3A CN201911247213A CN111010792A CN 111010792 A CN111010792 A CN 111010792A CN 201911247213 A CN201911247213 A CN 201911247213A CN 111010792 A CN111010792 A CN 111010792A
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Abstract
A rotating plasma jet trigger device and a trigger method are disclosed, wherein a plurality of front stage trigger devices generate trigger pulses for alternately breaking through and conducting an air gap switch; the negative-polarity high-voltage direct-current source charges the energy storage capacitor through the protection resistor, and after the air gap switch is broken down and conducted on the basis of the trigger pulse, the energy storage capacitor discharges to the discharge resistor through the loop to generate a high-voltage pulse; and when the high-voltage pulse received by the needle electrode is applied to the excitation cavity, the excitation cavity alternately sprays plasma to the gas switch for discharging so as to guide the gas switch to break down and conduct.
Description
Technical Field
The invention relates to the technical field of high voltage electrician, in particular to a rotary plasma jet trigger device and a trigger method.
Background
The plasma jet trigger device has good application prospect in the field of rapid discharge of high-voltage switches due to the advantages of low jitter, low working coefficient and the like. In the plasma jet triggering technology, in the plasma jet process, the interior of the cavity is subjected to surface air breakdown and the like to generate large-current discharge, so that the interior of the jet device is seriously ablated, the service life is greatly reduced, and the stability and the reliability of the device are obviously influenced.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In order to solve the problems, the invention provides a rotating plasma jet triggering device and a triggering method, wherein a plurality of plasma jet devices are prepared between a plate electrode and an insulating part, and for the plurality of plasma jet devices, the rotating triggering is controlled by a triggering loop, so that the rotating conduction of the jet devices is realized, the conduction of a high-voltage switch in a cavity is maintained, the ablation in the jet devices is reduced, and the stability of the device is improved.
The purpose of the invention is realized by the following technical scheme. A cyclic plasma jet ignition device comprises a plasma jet ignition device,
a plurality of pre-stage trigger devices configured to generate trigger pulses for alternately breaking through the conducting air-gap switches;
the trigger circuits comprise a negative polarity high-voltage direct-current source, an energy storage capacitor, a protection resistor, a discharge resistor and an air gap switch, wherein the negative polarity high-voltage direct-current source charges the energy storage capacitor through the protection resistor, and the air gap switch is broken down and conducted based on the trigger pulse, and then the energy storage capacitor discharges the discharge resistor through the circuits to generate high-voltage pulse;
a gas switch, comprising a gas inlet and a gas outlet,
high-voltage electrodes which are paired with the plate electrodes independently and are directly connected with the high-voltage end of the operating line,
a plate electrode arranged at a distance from the high-voltage electrode and kept at a common high voltage with the high-voltage electrode, the plate electrode being provided with a plurality of excitation cavities on a side thereof remote from the high-voltage electrode,
an insulating member provided on a side of the plate electrode away from the high-voltage electrode, the insulating member being provided with a plurality of through holes corresponding to the excitation chambers,
the needle electrodes arranged in the through holes are connected with the trigger circuit to receive the high-voltage pulse, the needle electrodes, the plate electrode with an excitation cavity and the high-voltage electrode form a plasma injection device, and when the high-voltage pulse received by the needle electrodes is applied to the excitation cavity, the excitation cavity alternately injects plasma into a gas switch to discharge so as to break down and conduct the gas switch.
In the rotary plasma jet trigger device, the front stage trigger device comprises a rectifying circuit and a MOSFET switch KPAnd the control circuit, the low-inductance pulse main capacitor, the discharge tube and the pulse transformer are connected in parallel directly to control the conduction of the discharge tube.
In the rotating plasma jet triggering device, a rectifying circuit comprises an alternating current source, a transformer, a high-voltage diode and a charging resistor, one end of the transformer is connected with the alternating current source, the other end of the transformer is connected with the high-voltage diode, the alternating current source is adjustable within 0-250v, the transformation ratio of the transformer to a pulse transformer is 1: 10, the charging resistor is 200k omega, and the main capacitor of the low-inductance pulse is 120 uF.
In the rotating plasma jet trigger device, the voltage of a direct-current power supply is adjustable from 0kV to 30kV, the charging capacitor is 130uF, the discharging resistor is 0.35 omega, the protection resistor is 2M omega, and the air gap switch is a three-electrode field distortion gas spark switch.
In the rotating plasma jet triggering device, the excitation cavity comprises a cylindrical groove with the diameter of 30mm and the depth of 10mm, the bottom of the cylindrical groove is provided with a conical groove with the diameter of 4mm and the depth of 10mm, and the conical tip of the conical groove is communicated with the other side of the plate electrode close to the high-voltage electrode.
In the rotating plasma jet trigger device, the low potential of a trigger loop is connected to a plate electrode, and the high potential is connected to needle electrodes of different plasma jet devices through cables.
In the rotating plasma jet trigger device, a negative polarity high-voltage direct current source is connected with an energy storage capacitor in parallel and is connected to a needle electrode of a gas switch through an air gap switch, one end of the energy storage capacitor is connected with a charging resistor for charging, and the other end of the energy storage capacitor is connected with a discharging resistor in parallel through the air gap switch.
In the rotating plasma jet trigger device, the plate electrode is of a cylindrical structure made of stainless steel materials, the insulating part is made of polyimide, the pin electrode tightly attached to the inner surface of the through hole is made of tungsten-copper materials, the pin electrode is connected with high voltage of a trigger loop, the high voltage electrode is a stainless steel circular plate, and the edge of the high voltage electrode is provided with a chamfer.
In the rotating plasma jet trigger device, the diameter of the plate electrode is 200mm, and the thickness of the plate electrode is 20 mm; the diameter of the insulating part is 200mm, and the thickness of the insulating part is 20 mm; the diameter of the high-voltage electrode is 200mm, and the thickness is 10 m.
According to another aspect of the present invention, a triggering method of the cyclic plasma jet triggering apparatus includes the steps of,
the method comprises the following steps that firstly, a plurality of front stage trigger devices generate trigger pulses for alternately breaking through and conducting air gap switches;
in a plurality of trigger loops for receiving the trigger pulse, a negative-polarity high-voltage direct-current source charges an energy storage capacitor through a protection resistor, and after an air gap switch is broken down and conducted based on the trigger pulse, the energy storage capacitor discharges to a discharge resistor through the loops to generate a high-voltage pulse;
in the third step, the high-voltage pulse received by the needle electrode is applied to a plasma jet device, an excitation cavity of the plasma jet device jets plasma to a gas switch to discharge so as to guide the gas switch to break down and conduct,
and fourthly, different pre-stage trigger devices repeat the first step to the third step to alternately jet the plasma into the gas switches to discharge so as to guide the gas switches to be alternately broken down and conducted.
Compared with the prior art, the invention has the beneficial effects that:
in the gas switch, two or more sets of plasma jet trigger devices are arranged, the plasma jet trigger devices share the same high voltage, and the electrodes are independently paired. When the plasma jet device is triggered, the plasma jet device is triggered in turn, and the time interval of the alternate jet is adjustable from us to ms. Firstly, the spraying devices are started in turn, so that the burning loss degree of a single device can be reduced, and the service life is prolonged; secondly, under the influence of ablation degree, the high-voltage direct current resistance and ablation resistance of the alternate injection device are improved, and the stability and reliability of the alternate injection device are obviously improved; thirdly, when the conduction current is small, the trigger devices can stop in turn, the jet cavity is recovered, and the jet cavity can be triggered for a plurality of turns in a burst mode in a short time, so that the gap is still kept in a conducting state under the condition of small current.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic view of a cyclic plasma jet ignition device of the present invention;
FIG. 2 is a schematic diagram of a pre-trigger apparatus according to the present invention;
fig. 3 is a schematic diagram of the triggering method of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1, a cyclic plasma jet ignition device includes,
a plurality of pre-stage trigger devices 6 configured to generate trigger pulses for alternately breaking through the conducting air-gap switches S;
a plurality of trigger circuits 7, the trigger circuits 7 including a negative polarity high voltage DC source UrAn energy storage capacitor C,A protective resistor R, a discharge resistor R and an air gap switch S, wherein a negative polarity high voltage DC source UrThe energy storage capacitor C is charged through the protection resistor R, and after the air gap switch S is broken down and conducted based on the trigger pulse, the energy storage capacitor C discharges the discharge resistor R through the loop to generate a high-voltage pulse;
the gas switch 8, which comprises,
and the high-voltage electrode 4 is independently paired with the plate electrode and is directly connected with the high-voltage end of the operating line.
A plate electrode 1 which is arranged at a distance from the high-voltage electrode 4 and is kept at a common high voltage and is grounded, the plate electrode 1 is provided with a plurality of excitation cavities at one side of the plate electrode away from the high-voltage electrode 4,
an insulator 2 provided on a side of the plate electrode 1 remote from the high-voltage electrode 4, the insulator 2 being provided with a plurality of through holes corresponding to the excitation chambers,
a plurality of needle electrodes 3, the needle electrodes 3 arranged in the through holes are connected with the trigger circuit 7 to receive the high-voltage pulse, the needle electrodes 3, the plate electrode 1 with an excitation cavity and the high-voltage electrode 4 form a plasma injection device 5, and when the high-voltage pulse received by the needle electrodes 3 is applied to the excitation cavity, the excitation cavity alternately injects plasma into a gas switch 8 to discharge so as to break down and conduct the gas switch 8.
The device disclosed by the invention has the advantages that the trigger gap is influenced by the trigger circuit 7, the plasma can be alternately conducted and sprayed along with time, the time interval from us to ms can be adjusted, the trigger gap is conducted in a high-efficiency rotating type plasma spraying mode, the conduction of the high-voltage switch in the cavity is maintained, the service life of the spraying device is effectively prolonged, and the reliability of the device is improved.
For further understanding of the present invention, the following description will be made of the highly reliable cyclic plasma spray triggering device by taking the example of two spray devices alternately spraying.
The device alternately activates the plasma spray devices 5 by inputting different activation signals.
As shown in fig. 1, the gas switch 8 generates plasma by means of the plasma jet device 5, which plasma is jetted into the switch chamber through a small gap in its upper sectionThe gas between the high-voltage electrode 4 and the plate electrode 1 is broken down by the influence of the plasma, and the switch is turned on. The gas inside the gas switch 8 is preferably SF6A gas. The high voltage electrode 4 of the plasma jet device 5 in the gas switch 8 is kept at the same high voltage with the plate electrode 1, two or more plasma jet cavity devices are uniformly distributed on the plate electrode 1, and different needle electrodes 3 are connected with trigger circuits 7 of different circuits.
As shown in FIG. 1, the trigger circuit 7 is first powered by a negative polarity high voltage DC source Ur1、Ur2Through the charging resistance r1、r2To the capacitor C1、C2Charging energy storage, the front stage trigger device 6 gives trigger pulse to drive the air gap switch S1、S2And (4) breakdown, wherein the air gap switch S adopts a three-electrode field distortion gas spark switch, and a high-voltage pulse generated by the preceding stage trigger device 6 is connected with the middle electrode. After the air-gap switch is turned on, the capacitor C1、C2Through a loop to a resistor R1、R2The discharge generates a high voltage pulse which is applied to the excitation chamber of the plasma j et 5 causing the excitation chamber to eject plasma into the gas switch 8 causing a discharge which breaks down the switch. Capacitor C in loop1、C2Preferably 130uF, resistance R1、R2Preferably 0.35 omega, a protective resistance r preferably 2M omega, a direct supply voltage Ur1、Ur2Preferably 18 kV.
Fig. 2 shows an exploded view of the pre-trigger arrangement 6, which shows a circuit diagram of a trigger pulse input to the air-gap switch S.
As shown in FIG. 2, the pre-trigger device 6 converts the AC signal into DC signal by the rectifying circuit, and the converting circuit is composed of AC source AC and transformer M1High voltage diode D1Charging resistor R3And (4) forming. The rectified voltage passes through a resistor R3、R4Voltage division, the main capacitor C plays a role in bearing voltage; at this time, MOSFET tube KpConducting, neglecting the shared voltage, and ensuring that the voltage borne by the main capacitor C is not enough to cause the breakdown of the discharge tube NL; control circuit outputs signal to make KpDisconnection, voltage rise, discharge tube NLBreakdown, at this time in the pulse transformer M2The primary side generates high-voltage pulses, and the secondary side amplifies the high-voltage pulses to generate high-amplitude voltage pulses which act on the air-gap switch S. The trigger circuit 7 is a 15V IGBT square wave driving signal which is connected with the MOSFET tube to control the turn-off of the MOSFET tube. After breakdown, by M2The amplified signal preferably has a positive polarity pulse voltage with an amplitude of 40kV, a rise time of about several tens ns, and a pulse width of about 10 us.
Compared with the prior single-stage trigger, the high-reliability rotating plasma jet trigger device provided by the invention can better delay the ablation degree of the electrode and has good protection effect on a discharge switch device.
In the preferred embodiment of the rotating plasma jet trigger device, the pre-trigger device 6 comprises a rectifying circuit and a MOSFET switch KPControl circuit, low-inductance pulse main capacitor C and discharge tube NLAnd pulse transformer M2Wherein, the low-inductance pulse main capacitor C is directly connected with the discharge tube in parallel to control the conduction of the discharge tube.
In the preferred embodiment of the rotating plasma jet triggering device, the rectifying circuit comprises an alternating current source AC and a transformer M1High voltage diode D1And a charging resistor R3Said transformer M1One end of the high-voltage diode is connected with an alternating current source AC, and the other end of the high-voltage diode is connected with a high-voltage diode D1Connected, the AC source is adjustable between 0 and 250v, and the transformer M1And pulse transformer M3The transformation ratio is 1: 10, and the charging resistance R3200k omega, and the main capacitor C of the low-inductance pulse is 120 uF.
In a preferred embodiment of the rotating plasma jet trigger device, the voltage of a direct-current power supply is adjustable from 0kV to 30kV, the charging capacitor is 130uF, the discharging resistor is 0.35 omega, the protection resistor is 2M omega, and the air gap switch is a three-electrode field distortion gas spark switch.
In a preferred embodiment of the rotating plasma jet triggering device, the excitation cavity comprises a cylindrical groove with the diameter of 30mm and the depth of 10mm, the bottom of the cylindrical groove is provided with a conical groove with the diameter of 4mm and the depth of 10mm, and the conical tip of the conical groove is communicated with the other side, close to the high-voltage electrode 4, of the plate electrode 1.
In the preferred embodiment of the described cyclic plasma spray triggering device, the trigger circuit 7 is connected to the plate electrode 1 at a low potential and to the needle electrodes 3 of the different plasma spray devices at a high potential via cables.
In the preferred embodiment of the rotating plasma jet trigger device, the high-voltage direct current source with negative polarity is connected with the energy storage capacitor in parallel and is connected to the needle electrode 3 of the gas switch 8 through the air gap switch S, one end of the energy storage capacitor is connected with the charging resistor for charging, and the other end of the energy storage capacitor is connected with the discharging resistor in parallel through the air gap switch.
In the preferred embodiment of the rotating plasma jet trigger device, the plate electrode 1 is a cylindrical structure made of stainless steel material, the insulating member 2 is made of polyimide, the needle electrode 3 tightly attached to the inner surface of the through hole is made of tungsten copper material, the needle electrode 3 is connected with the high voltage of the trigger circuit 7, the high voltage electrode 4 is a stainless steel circular plate, and the edge of the high voltage electrode 4 is provided with a chamfer angle.
In the preferred embodiment of the rotating plasma jet trigger device, the diameter of the plate electrode 1 is 200mm, and the thickness is 20 mm; the diameter of the insulating part 2 is 200mm, and the thickness is 20 mm; the high voltage electrode 4 has a diameter of 200mm and a thickness of 10 m.
In one embodiment, the rotating plasma jet triggering device can adopt two or more sets of plasma jet triggering devices, the jet triggering devices are connected with the MOSFET-based triggering devices through circuits, and the plasma jet devices 5 are controlled to jet in turn by inputting different triggering signals.
In one embodiment, the rotating plasma jet trigger device comprises a pre-trigger device 6, a trigger loop 7 and a gas switch 8. The plasma jet device 5 is operated by controlling different input signals to control the front stage trigger device 6 to trigger different loops.
In one embodiment, the pre-trigger device 6 has the same loop set composition, and comprises a rectification circuit and a MOSFET switch KPControl circuit, low-inductance pulse main capacitor C and discharge tube NLPulse transformer M2。
In one embodiment, the rectification circuit comprises an AC source, a transformer M1High voltage diode D1Charging resistor R3. The transformer M1One end of the high-voltage diode is connected with an alternating current source AC, and the other end of the high-voltage diode is connected with a high-voltage diode D1The connection achieves the rectification effect. The alternating current source AC is preferably adjustable in 0-250 v. Transformer M1The transformation ratio is preferably 1: 10, and the charging resistance R3Preferably 200k omega.
In one embodiment, the low-inductance pulse main capacitor C plays a role in storing electric energy, is directly connected with the discharge tube in parallel and controls the conduction of the discharge tube, and is a non-inductance high-voltage pulse capacitor with extremely small resistance. The low inductance pulse main capacitor C is preferably 120 uF.
In one embodiment, the pulse transformer M2The pulse voltage is lifted, and the transformation ratio is 1: 10.
In one embodiment, the multi-way trigger circuit comprises a negative polarity high-voltage direct current source UrThe device comprises an energy storage capacitor C, a protection resistor R, a discharge resistor R and an air gap switch S. The low potential of the loop is connected with the same plate electrode, and the high potential is connected with the needle electrodes 3 of different plasma spraying devices through cables.
In one embodiment, the negative polarity high voltage DC source UrAnd an energy storage capacitor C1，C2Connected in parallel and connected to the 3-pin electrode of the gas switch via an air gap switch S. The DC power supply UrThe voltage U is preferably adjustable at 0-30 kV.
In one embodiment, the capacitance C1，C2One end of the energy storage device is connected with a charging resistor R for charging, and the other end of the energy storage device is connected with a resistor (R) through an air gap switch S1，R2) In parallel, the charging capacitor C1，C2Preferably 130uF, and the resistance R is preferably 0.35 Ω. The protective resistor r is preferably 2M Ω, and the air gap switch S uses a three-electrode field distortion gas spark switch.
In one embodiment, the gas switch comprises a plate electrode 1, an insulator 2, a pin electrode 3 and a high voltage electrode 4. The insulator 2, the needle electrode 3, the high voltage electrode 4 and a part of the plate electrode 1 together constitute a plasma spraying device.
In one embodiment, the base shape of the plate electrode 1 is cylindrical, the material is preferably stainless steel, and the plate electrode 1 has a diameter of 200mm and a thickness of 20 mm. A cylindrical groove with the diameter of 30mm and the depth of 10mm is arranged in the range of the plasma jet device, and a conical groove with the bottom diameter of 4mm and the depth of 10mm is arranged in the groove. The conical tip communicates with the other face of the plate electrode 1 to allow plasma to be ejected therethrough. The plate electrode 1 is connected to a ground electrode.
In one embodiment, the insulator 2 is a cylinder-like structure with a through hole, preferably made of polyimide. The insulating part 2 has a diameter of 200mm and a thickness of 20 mm. The device has a cylinder with a diameter of 30mm and a height of 10mm, and can be attached to the concave surface of the plate electrode 1. A through hole with the diameter of 4mm is arranged at the center of the cylinder and is used as a plasma generating cavity.
The needle electrode 3 is made of tungsten copper and is tightly attached to the inner surface of the through hole of the insulating part 2. The needle electrode is connected to the high voltage of the trigger circuit.
The high voltage electrode 4 is a circular plate, and the material is preferably stainless steel. The diameter of the high-voltage electrode 4 is 200mm, the thickness is 10m, and the edge is provided with a chamfer. Connected to the high voltage of the gas switch.
The device can alternately conduct and spray plasma at the trigger gap along with time, and the time interval from us to ms can be adjusted, so that the trigger gap is conducted in a high-efficiency rotating plasma spraying mode, the service life of the spraying device is effectively prolonged, and the reliability of the device is improved.
As shown in fig. 3, a triggering method of the cyclic plasma jet triggering apparatus includes the steps of,
the method comprises the following steps that firstly, a plurality of front stage trigger devices generate trigger pulses for alternately breaking through and conducting an air gap switch S;
a second step of receiving the trigger pulse in the trigger circuit of the plurality of trigger circuits, and using a high-voltage direct current source U with negative polarityrThe energy storage capacitor C is charged through the protection resistor R, and after the air gap switch S is broken down and conducted based on the trigger pulse, the energy storage capacitor C discharges the discharge resistor R through the loop to generate a high-voltage pulse;
in the third step, high-voltage pulses received by the needle electrode are applied to a plasma jet device, an excitation cavity of the plasma jet device jets plasma to a gas switch to discharge so as to guide the gas switch to break down and conduct in turn,
and fourthly, different front stage trigger devices repeat the first step to the third step to alternately jet plasmas into the gas switches to discharge so as to guide the gas switches to be alternately broken down and conducted.
Industrial applicability
The rotating plasma jet trigger device and the triggering method of the rotating plasma jet trigger device can be manufactured and used in the field of high-voltage electric machining.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A cyclic plasma jet trigger device, comprising,
a plurality of pre-stage trigger devices configured to generate trigger pulses for alternately breaking through the conducting air-gap switches;
the trigger circuits comprise a negative polarity high-voltage direct-current source, an energy storage capacitor, a protection resistor, a discharge resistor and an air gap switch, wherein the negative polarity high-voltage direct-current source charges the energy storage capacitor through the protection resistor, and the air gap switch is broken down and conducted based on the trigger pulse, and then the energy storage capacitor discharges the discharge resistor through the circuits to generate high-voltage pulse;
a gas switch, comprising a gas inlet and a gas outlet,
high-voltage electrodes which are paired with the plate electrodes independently and are directly connected with the high-voltage end of the operating line,
a plate electrode arranged at a distance from the high-voltage electrode and kept at a common high voltage with the high-voltage electrode, the plate electrode being provided with a plurality of excitation cavities on a side thereof remote from the high-voltage electrode,
an insulating member provided on a side of the plate electrode away from the high-voltage electrode, the insulating member being provided with a plurality of through holes corresponding to the excitation chambers,
the needle electrodes arranged in the through holes are connected with the trigger circuit to receive the high-voltage pulse, the needle electrodes, the plate electrode with an excitation cavity and the high-voltage electrode form a plasma injection device, and when the high-voltage pulse received by the needle electrodes is applied to the excitation cavity, the excitation cavity alternately injects plasma into a gas switch to discharge so as to break down and conduct the gas switch.
2. The rotating plasma jet ignition device of claim 1, preferably wherein the pre-ignition means comprises a rectifying circuit, a MOSFET switch KP and its control circuit, a low-inductance pulse main capacitor, a discharge tube and a pulse transformer, wherein the low-inductance pulse main capacitor is directly connected in parallel with the discharge tube to control the conduction of the discharge tube.
3. The rotating plasma jet ignition device of claim 2, wherein the rectifying circuit comprises an ac source, a transformer, a high voltage diode and a charging resistor, wherein one end of the transformer is connected with the ac source, the other end of the transformer is connected with the high voltage diode, the ac source is adjustable from 0v to 250v, the transformation ratio of the transformer to the pulse transformer is 1: 10, the charging resistor is 200k Ω, and the main capacitance of the low-inductance pulse is 120 uF.
4. The rotating plasma jet trigger device of claim 1, wherein the dc supply voltage is adjustable from 0-30kV, the charging capacitance is 130uF, the discharge resistance is 0.35 Ω, the protection resistance is 2M Ω, and the air gap switch is a three-electrode field-distorted gas spark switch.
5. The rotating plasma jet ignition device according to claim 1, wherein the excitation chamber comprises a cylindrical recess with a diameter of 30mm and a depth of 10mm, the bottom of the cylindrical recess is provided with a conical recess with a diameter of 4mm and a depth of 10mm, and the conical tip of the conical recess is communicated with the other side of the plate electrode close to the high-voltage electrode.
6. A rotating plasma spray triggering mechanism as recited in claim 1, wherein the trigger circuit has a low potential connected to the plate electrode and a high potential connected to the pin electrodes of different plasma spray mechanisms via cables.
7. A rotating plasma jet ignition device as claimed in claim 1, wherein the negative polarity high voltage dc source is connected in parallel with the energy storage capacitor, via the air gap switch, to the pin electrode of the gas switch, the energy storage capacitor being charged at one end by connection to the charging resistor and at the other end by connection to the discharging resistor via the air gap switch.
8. The rotating plasma jet trigger device according to claim 1, wherein the plate electrode is a cylindrical structure made of stainless steel material, the insulating member is made of polyimide, the pin electrode closely attached to the inner surface of the through hole is made of tungsten-copper material, the pin electrode is connected with high voltage of the trigger circuit, the high voltage electrode is a stainless steel circular plate, and the edge of the high voltage electrode is provided with a chamfer.
9. The cyclic plasma jet ignition device of claim 1, wherein the plate electrode is 200mm in diameter and 20mm thick; the diameter of the insulating part is 200mm, and the thickness of the insulating part is 20 mm; the diameter of the high-voltage electrode is 200mm, and the thickness is 10 m.
10. A method of triggering a rotating plasma jet trigger device according to any one of claims 1-9, comprising the steps of,
the method comprises the following steps that firstly, a plurality of front stage trigger devices generate trigger pulses for alternately breaking through and conducting air gap switches;
in a plurality of trigger loops for receiving the trigger pulse, a negative-polarity high-voltage direct-current source charges an energy storage capacitor through a protection resistor, and after an air gap switch is broken down and conducted based on the trigger pulse, the energy storage capacitor discharges to a discharge resistor through the loops to generate a high-voltage pulse;
a third step, applying the high-voltage pulse received by the needle electrode to a plasma jet device, wherein an excitation cavity of the plasma jet device jets plasma to a gas switch to discharge so as to guide the gas switch to break down and conduct;
and fourthly, different front stage trigger devices repeat the first step to the third step to alternately jet plasmas into the gas switches to discharge so as to guide the gas switches to be alternately broken down and conducted.
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Cited By (3)
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| CN111641014A (en) * | 2020-06-02 | 2020-09-08 | 西安电子工程研究所 | Dual-channel bipolar ultra-wideband microwave generator based on flat transmission line |
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| CN117596762A (en) * | 2024-01-18 | 2024-02-23 | 离享未来(德州)等离子科技有限公司 | Bipolar nanosecond pulse power supply for discharge plasma |
| CN117596762B (en) * | 2024-01-18 | 2024-04-05 | 离享未来(德州)等离子科技有限公司 | Bipolar nanosecond pulse power supply for discharge plasma |
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