Discharge circuit, surge protection circuit, ignition circuit and electronic equipment

Abstract

The embodiment of the invention discloses a discharge circuit, a surge protection circuit, an ignition circuit and electronic equipment. The discharge circuit comprises a three-pole gas discharge tube, a first impedance branch and a second impedance branch, and a first pole of the three-pole gas discharge tube is electrically connected with a second pole of the three-pole gas discharge tube through the first impedance branch; the second pole of the three-pole gas discharge tube is electrically connected with the third pole of the three-pole gas discharge tube through a second impedance branch;and for the same high frequency, Z11:Z12 is not equal to VBR1:VBR2, Z11 is the high-frequency impedance mode of the first impedance branch, Z12 is the high-frequency impedance mode of the second impedance branch, VBR1 is the direct-current breakdown voltage of the discharge gap between the first pole and the second pole of the tripolar gas discharge tube, and VBR2 is the direct-current breakdownvoltage of the discharge gap between the second pole and the third pole of the tripolar gas discharge tube, wherein the high frequency is greater than power frequency. According to the technical scheme provided by the embodiment of the invention, the impact breakdown voltage of the gas discharge tube can be reduced, the protection blind area is reduced, and even the blind area is removed.

Description

technical field [0001] The invention relates to the technical field of discharge circuits, in particular to a discharge circuit, a surge protection circuit, an ignition circuit and electronic equipment. Background technique [0002] Electromagnetic pulse (EMP) and lightning electromagnetic pulse (Lightning electromagnetic pulse, LEMP) protection is currently mainly based on the high-voltage characteristics of EMP and LEMP for targeted protection. Gas discharge tube (Gas Discharge Tube, GDT) is exactly the Designed for high voltage or overvoltage characteristics, using the Penning effect, filling the packaging space with a certain pressure of gas, and coating the cathode material on the metal electrode, so that the device exhibits certain DC withstand voltage characteristics and pulse breakdown voltage characteristics. Currently there are glass gas discharge tubes and ceramic gas discharge tubes. [0003] Take a GDT with a DC breakdown voltage of 3000V as an example. The imp...

AI Technical Summary

Problems solved by technology

[0003] Take a GDT with a DC breakdown voltage of 3000V as an example. The impact breakdown voltage of this GDT is about 3600V. The environment used by this GDT is mostly an environment with a withstand voltage of 1500VAC. The peak voltage of this AC environment is 2121VDC. Even in this environment The design increases the withstand voltage by 20%. The withstand voltage of the equipment is 1500*1.2*1.414=2545VDC. From the data, there is no way to protect EMP or LEMP between 2545V and 3600V. This is the blind area of ​​this type of 3000VGDT. There is no good solution in the application; in actual application and testing, the probability of equipment being damaged by EMP and LEMP is very high, and GDTs of other voltage levels have the same problem, the impact breakdown voltage is too high, and there is a protection blind zone

Images