A vacuum trigger tube rapid ignition device

Abstract

The present invention relates to the technical field of power equipment, and in particular to a vacuum trigger tube rapid ignition device, comprising a vacuum trigger tube, a pulse transformer, a thyristor trigger circuit, a charging capacitor, a charging circuit, and a resonant circuit; the charging circuit is used to charge the charging capacitor, the thyristor trigger circuit is connected between the charging capacitor and the pulse transformer, the trigger electrode of the vacuum trigger tube is connected to the output electrode of the pulse transformer, and the main electrode of the vacuum trigger tube is connected in series with the resonant circuit; the present invention stores sufficient energy in the charging capacitor, generates a trigger signal through the thyristor trigger circuit, triggers the thyristor, and transmits the energy to the vacuum trigger tube through the pulse transformer, thereby generating a voltage and current that meet the triggering conditions and realizing rapid triggering of the vacuum trigger tube.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, in particular to a vacuum trigger tube rapid ignition device. Background Art

[0002] At present, high-speed mechanical switches are increasingly used in the high-voltage field. The key to solving the opening and closing speed of high-speed mechanical switches and the service life of switches lies in manual active zero-crossing breaking. The key technology of manual active zero-crossing breaking lies in the auxiliary resonant circuit connected in parallel with the main switch. The auxiliary resonant circuit often requires high-voltage and high-current high-speed switching devices. Currently, vacuum trigger tubes are the best choice.

[0003] A vacuum trigger tube, also known as a vacuum trigger gap or triggered vacuum switch, has both its main working gap and trigger gap sealed in a vacuum. The main working gap consists of two main electrodes spaced a certain distance apart, carrying the current conducted after triggering. The trigger gap is located within one of the main electrodes. It is a development and improvement of the traditional air-triggered spherical gap. Its operating principle: A trigger pulse applied to the trigger gap causes the gap's vacuum to break down, generating a metal vapor arc containing a large amount of plasma. This arc extends into the main working gap, causing it to break down and discharge, generating an extremely strong metal vapor arc. Its conduction current can reach hundreds of kiloamperes, and its operating voltage can reach hundreds of kilovolts. It is an ultra-high-power pulse switching device with an operating frequency exceeding 10 kHz and a triggering time ranging from tens to hundreds of nanoseconds.

[0004] If a thyristor is used to form an auxiliary resonant circuit in parallel with the main switch to achieve fast zero-crossing disconnection, the thyristor is sensitive to high voltage and is easily broken down by high voltage in actual use. The breaking current is far below the requirements of the vacuum trigger tube, so its practical application is limited. Summary of the Invention

[0005] In response to the problems in the prior art, the present invention aims to provide a vacuum trigger tube rapid ignition device. By utilizing the rapid triggering characteristics of the vacuum trigger tube and cooperating with an auxiliary resonant circuit, the device overcomes the defect of slow mechanical switching speed and realizes a large current zero-crossing rapid disconnection in the auxiliary circuit of the high-voltage main switch.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A vacuum trigger tube rapid ignition device, comprising a vacuum trigger tube, a pulse transformer, a thyristor trigger circuit, a charging capacitor, a charging circuit and a resonant circuit;

[0008] The charging circuit is used to charge the charging capacitor, the thyristor trigger circuit is connected between the charging capacitor and the pulse transformer, the trigger electrode of the vacuum trigger tube is connected to the output electrode of the pulse transformer, and the main electrode of the vacuum trigger tube is connected in series with the resonant circuit.

[0009] In a further technical solution, the thyristor trigger circuit can receive an external control signal and trigger discharge.

[0010] In a further technical solution, the pulse transformer transfers the energy of the charging capacitor to the trigger electrode of the vacuum trigger tube through the thyristor trigger circuit, so that the vacuum trigger tube obtains energy and is quickly triggered.

[0011] Compared with the prior art, the present invention has the following technical effects:

[0012] The vacuum trigger tube rapid ignition device provided by the present invention stores sufficient energy in a charging capacitor, and then generates a trigger signal through a thyristor trigger circuit to trigger the thyristor, which transmits the energy to the vacuum trigger tube through a pulse transformer, thereby generating a voltage and current that meet the triggering conditions and realizes rapid triggering of the vacuum trigger tube. As a result of the rapid triggering, the auxiliary switch is quickly turned on, and the current generated by the resonant circuit of the auxiliary switch, which is equal to the current in the opposite direction to that of the main switch, is quickly introduced into the main switch, so that the currents of the main switches are offset. At this time, the main switch can achieve zero-crossing disconnection.

[0013] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It shows a schematic structural diagram of a vacuum trigger tube rapid ignition device provided according to a specific embodiment of the present invention;

[0015] Explanation of the numbers in the figure: 1. Vacuum trigger tube; 2. Pulse transformer; 3. Thyristor trigger circuit; 4. Charging capacitor; 5. Charging circuit; 6. Resonant circuit. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further explained below with reference to specific drawings.

[0017] The present invention utilizes the fast triggering characteristic of the vacuum trigger tube and cooperates with the auxiliary resonant circuit to overcome the defect of slow mechanical switching speed and realize the high-voltage main switch auxiliary circuit to form a large current zero-crossing fast disconnection.

[0018] To this end, combined Figure 1As shown, the present invention provides a vacuum trigger tube rapid ignition device, comprising a vacuum trigger tube 1, a pulse transformer 2, a thyristor trigger circuit 3, a charging capacitor 4, a charging circuit 5 and a resonant circuit 6;

[0019] The charging circuit 5 is used to charge the charging capacitor 4, the thyristor trigger circuit 3 is connected between the charging capacitor 4 and the pulse transformer 2, the trigger electrode of the vacuum trigger tube 1 is connected to the output electrode of the pulse transformer 2, and the main electrode of the vacuum trigger tube 1 is connected in series with the resonant circuit 6.

[0020] The thyristor trigger circuit 3 can receive an external control signal and trigger discharge.

[0021] The pulse transformer 2 transfers the energy of the charging capacitor 4 to the trigger electrode of the vacuum trigger tube 1 through the thyristor trigger circuit 3, so that the vacuum trigger tube 1 obtains energy and is triggered quickly.

[0022] The specific working principle is as follows: the charging circuit 5 is responsible for charging the charging capacitor 4. After the charging capacitor 4 stores sufficient energy, it generates a trigger signal through the thyristor trigger circuit 3 to trigger the thyristor to transfer the energy to the vacuum trigger tube 1 through the pulse transformer 2, generating a voltage and current that meet the trigger conditions to achieve rapid triggering of the vacuum trigger tube 1. As a result of its rapid triggering, the auxiliary switch is quickly turned on, and the current generated by the resonant circuit 6 of the auxiliary switch is quickly introduced into the main switch, so that the current of the main switch is offset. At this time, the main switch can achieve zero-crossing disconnection.

[0023] The basic principles, main features, and characteristics of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum trigger tube rapid ignition device, characterized in that: It includes a vacuum trigger tube, a pulse transformer, a thyristor trigger circuit, a charging capacitor, a charging circuit and a resonant circuit; The charging circuit is used to charge the charging capacitor, the thyristor trigger circuit is connected between the charging capacitor and the pulse transformer, the trigger electrode of the vacuum trigger tube is connected to the output electrode of the pulse transformer, and the main electrode of the vacuum trigger tube is connected in series with the resonant circuit.

2. The vacuum trigger tube rapid ignition device according to claim 1, characterized in that: The thyristor trigger circuit can receive an external control signal and trigger discharge.

3. The vacuum trigger tube rapid ignition device according to claim 1, characterized in that: The pulse transformer transfers the energy of the charging capacitor to the trigger electrode of the vacuum trigger tube through the thyristor trigger circuit, so that the vacuum trigger tube obtains energy and is quickly triggered.

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