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Circuit protection device

A technology of circuit protection and devices, which is applied in the field of circuit protection devices, can solve problems such as gas discharge tube short circuit, bursting, and affecting safe use, and achieves the effect of convenient use and miniaturization and integration

Pending Publication Date: 2016-07-13
SHENZHEN BENCENT ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high-current power-frequency overcurrent, the gas discharge tube will heat up due to the long-term or frequent overcurrent, which is too high. The temperature will not only affect the safe use of other devices in the circuit, but also make the gas discharge tube have a risk of short circuit or burst, and even burn the customer's circuit board to cause a fire

Method used

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Embodiment Construction

[0021] An embodiment of the present invention provides a circuit protection device, comprising: a gas discharge tube having at least two electrodes, that is, a first electrode and a second electrode; a third electrode movably connected to the second electrode through a bimetal; When the working temperature is a normal temperature, the third electrode is electrically connected to the second electrode; when the working temperature exceeds the normal temperature, the bimetal strip is deformed so that the third electrode is connected to the second electrode The two electrodes are disconnected from the conductive connection.

[0022] Wherein, the gas discharge tube can be a diode or a multi-electrode tube; the normal temperature t is subject to the temperature range that the application environment of the circuit protection device can withstand, that is, t<T, and T is the application of the circuit protection device The limit temperature that the environment can withstand, and the ...

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Abstract

The invention provides a circuit protection device which comprises a gas discharge tube and a third electrode, wherein the gas discharge tube is at least provided with two electrodes, namely a first electrode and a second electrode; and the third electrode is movably connected with the second electrode through a bimetallic strip. When the working temperature exceeds a normal temperature, the bimetallic strip deforms to make the third electrode perform conductive disconnection with the second electrode. The circuit protection device can have a function of discharging a lightening current or overvoltage when subject to lightning stroke and surge overvoltage, and provide overvoltage protection for a follow-up circuit; besides, when the circuit protection device undergoes a certain continuous power frequency current or excessive power frequency current and undergoes temperature rise to an overturning point of the bimetallic strip due to heating, the circuit protection device is open-circuited due to the overturning of the bimetallic strip and provides overcurrent protection for the follow-up circuit.

Description

technical field [0001] The invention relates to the field of overvoltage protection products, in particular to a circuit protection device. Background technique [0002] The gas discharge tube is a switch type protection device, usually used as an overvoltage protection device. The gas discharge tube commonly used at present is made of an insulating tube body and electrodes sealed at both ends, and the inner cavity is filled with inert gas. When the voltage across the electrodes of the gas discharge tube exceeds the breakdown voltage of the gas, a gap discharge will be caused, and the gas discharge tube will quickly change from a high-resistance state to a low-resistance state, forming a conduction, thereby protecting other devices connected in parallel with it. . But at the same time, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high-current power-frequency overcurrent, the gas discharge tube will heat up due to the long-ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H5/04
CPCH02H5/041
Inventor 付猛
Owner SHENZHEN BENCENT ELECTRONICS CO LTD
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