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Closed planar three-electrode spark switch and preparation method thereof

A spark switch, three-electrode technology, applied in the direction of spark plugs, spark gaps, spark gap components, etc., can solve the problem of unstable self-breakdown performance and conduction performance of the switch, influence of circuits around the spark, and poor performance of high overload resistance Better and other problems, to achieve the effect of shortening the processing cycle, low price, strong ablation resistance

Active Publication Date: 2020-01-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the development of detonating foil detonation technology towards miniaturization and planarization, the traditional spark gap switch has the disadvantages of large size, difficulty in integration, and high price, and a planar three-electrode spark switch has appeared Its electrodes are exposed in the atmospheric environment, and its performance is affected by atmospheric temperature and humidity, particles, pollutants, electrode oxidation, etc., and the self-breakdown performance and conduction performance of the switch are unstable.
Secondly, the electric spark generated during the conduction process of the planar three-electrode spark switch may affect the surrounding circuits
In addition, the common planar three-electrode spark switches are based on MEMS technology and LTCC technology, usually use ceramics and other materials as the substrate, the performance of high overload resistance is not good, and the price is relatively expensive

Method used

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  • Closed planar three-electrode spark switch and preparation method thereof
  • Closed planar three-electrode spark switch and preparation method thereof
  • Closed planar three-electrode spark switch and preparation method thereof

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preparation example Construction

[0035] The preparation process of the closed planar three-electrode switch is as follows:

[0036] The process includes concrete steps as follows:

[0037] The first step is to clean the bottom PCB (1), and use the methods of exposure, development, and etching to coat copper on the upper surface of the bottom PCB 1 to obtain the circuit pattern corresponding to the switch, including the anode 2-1 of the switch. , cathode 2-2, trigger electrode 2-3 and pad 2-4 connected thereto.

[0038] In the second step, the pads 2-4 on the circuit layer are treated with chemical nickel gold or tin spraying to ensure the solderability and flatness of the pads; the anode 2-1 and cathode 2-2 on the circuit layer are Carry out immersion gold or gold plating and other process treatments with the trigger electrodes 2-3 to prevent the electrodes from being oxidized.

[0039] The fourth step is to use laser or mechanical cutting to open a window on the area corresponding to the pad and electrode ...

Embodiment 1

[0044]In this implementation case, a closed planar three-electrode spark switch based on printed circuit board technology is designed. According to the printed circuit board process and its processing steps, the switch can be divided into four parts: the bottom PCB board 1 , the circuit layer 2 , the PP layer 3 and the top PCB board 4 . The thickness of the bottom PCB board 1 is 1mm, and the material is FR-4, which is used as the carrier of the circuit layer in the whole switch. The circuit layer 2 directly etches the copper on the upper surface of the bottom PCB 1 by printing ink, developing, etching, and stripping the film to obtain the pattern corresponding to the switch. The thickness of the circuit layer is 35 μm. The circuit layer includes three electrodes of the planar three-electrode switch, that is, the anode 2-1, the cathode 2-2 and the trigger electrode 2-3 and the three pads 2-4 connected thereto; the anode and the cathode are semicircular electrodes, and the elect...

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Abstract

The invention belongs to the field of high-power pulses, and particularly relates to a closed planar three-electrode spark switch and a preparation method thereof. The closed planar three-electrode spark switch sequentially comprises a bottom layer PCB, a circuit layer, a PP layer and a top layer PCB, and the bottom layer PCB is a substrate of a switch circuit layer; the circuit layer comprises ananode, a cathode, a trigger electrode and a bonding pad connected with the anode, the cathode and the trigger electrode; pad windows are formed in the PP layer corresponding to the bonding pad, and electrode windows are formed in the PP layer corresponding to the electrodes; a bonding pad groove is formed in the position, corresponding to the bonding pad, of the top layer PCB, and a blind grooveis formed in the position, corresponding to the electrode, of the top layer PCB; the PP layer is used as a dielectric layer for bonding the top layer PCB and the bottom layer PCB, and the bottom layerPCB and the bottom layer PCB are laminated by using the PP layer, so that a cavity is formed in the whole switch. The planar three-electrode spark switch is made into a closed type by using a printedcircuit board technology, so that the working environment of the switch is stabilized, the high overload resistance of the switch is improved, the cost is greatly reduced, and the planar three-electrode spark switch can be widely applied to pulse power systems such as exploding foil exploders and electric cannons.

Description

technical field [0001] The invention belongs to the field of high-power pulses, and in particular relates to a closed planar three-electrode spark switch and a preparation method thereof. Background technique [0002] Switching technology is one of the core technologies of the pulse power system, which determines the output characteristics of pulse power. The basic requirements of high-voltage switches include high withstand voltage, small inductive reactance and impedance, short turn-on delay time and rise time, allowing large current to pass, good consistency, long life, etc. Based on the above characteristics, high-voltage switches play an important role in pulse power systems such as explosive foil initiation systems. [0003] The performance of the high-voltage switch has a great influence on the rise time and current magnitude of the current in the entire discharge circuit. Commonly used high-voltage switches include cold cathode trigger tubes (gas switches), vacuum ...

Claims

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Application Information

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IPC IPC(8): H01T1/22H01T21/00H05K1/16H05K3/00H05K3/46
CPCH01T1/22H01T21/00H05K1/16H05K3/0002H05K3/0082H05K3/4611
Inventor 朱朋汪柯胡艳张伟吴立志叶迎华沈瑞琪
Owner NANJING UNIV OF SCI & TECH
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