CN209982039U

CN209982039U - Transient voltage suppressor with temperature protection

Info

Publication number: CN209982039U
Application number: CN201921138378.2U
Authority: CN
Inventors: 罗禄全; 张祥贵; 王小楼; 王彦军
Original assignee: Xiamen Set Electronics Co Ltd
Current assignee: Xiamen Set Electronics Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-01-21
Anticipated expiration: 2029-07-19
Also published as: WO2021012938A1

Abstract

The utility model discloses a transient voltage suppressor with temperature protection, including shell, apron, TVS chip, first extraction electrode and second extraction electrode, still include the temperature fuse, the first electrode of temperature fuse is connected with first extraction electrode electricity, the second electrode of temperature fuse is connected with the first electrode electricity of TVS chip, the second electrode of TVS chip with the second extraction electrode electricity is connected; the TVS chip and the temperature fuse are contained in a cavity formed by the shell and the cover plate, and the first leading-out electrode and the second leading-out electrode are led out from the cover plate. The utility model discloses a temperature fuse is to TVS's the overheat protection that carries on, and the heat that produces at the in-process that TVS became invalid leads to the temperature fuse fusing to break away from the electric current with impaired TVS, avoid the conflagration to produce, this embodiment has characteristics such as simple structure, product reliable and stable.

Description

Transient voltage suppressor with temperature protection

Technical Field

The utility model relates to an overvoltage protection technical field especially relates to a transient voltage suppressor with temperature protection.

Background

A TVS (Transient Voltage Suppressor) device is an overvoltage protection device connected in telecommunication and network equipment, which is mainly used to discharge surge current and accurately clamp Voltage.

In recent years, with the development of 5G communication technology, the power supply power of a communication base station is increased, the size of base station equipment is reduced, the requirement on the integration degree of components is higher, the voltage withstanding level of some switching tubes and chips is reduced, a TVS capable of bearing 10kA surge current is used as a clamping protection, the peak power of the TVS is as high as 1000000W, the characteristic of low clamping voltage of the TVS is fully utilized, however, potential fire hazard is possibly caused when leakage current is increased and failure and short circuit failure occur, and the safety of personnel and equipment is greatly influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide a transient voltage suppressor with temperature protection, which breaks away from the circuit of the damaged TVS in the failure process of TVS, thereby avoiding the fire hazard.

In order to achieve the above object, the present invention provides a transient voltage suppressor with temperature protection, which comprises a housing, a TVS chip, a first extraction electrode and a second extraction electrode, and further comprises a temperature fuse, wherein the first electrode of the temperature fuse is electrically connected to the first extraction electrode, the second electrode of the temperature fuse is electrically connected to the first electrode of the TVS chip, and the second electrode of the TVS chip is electrically connected to the second extraction electrode; the TVS chip and the temperature fuse are contained in the shell, and the first leading-out electrode and the second leading-out electrode are led out of the shell.

Further, the first electrode and the second electrode of the TVS chip are solderable metal electrodes.

Further, the second electrode of the thermal fuse is directly soldered on the first electrode of the TVS chip.

Further, the second electrode of the temperature fuse and the first electrode of the TVS chip are integrated into one electrode.

Furthermore, the transient voltage suppressor is also provided with a third leading-out electrode, and the third leading-out electrode is electrically connected with the second electrode of the temperature fuse.

Further, the third extraction electrode and the second electrode of the temperature fuse are electrodes of an integrated structure.

Further, the second extraction electrode and the second electrode of the TVS chip are electrodes of an integrated structure.

Further, the temperature fuse is arranged on the side of the TVS chip.

Further, the action temperature of the temperature fuse is 102-205 ℃.

Further, the inner cavity of the shell is filled with an insulating medium.

Further, the insulating medium is epoxy resin or silicon rubber.

The utility model discloses a transient voltage suppressor with temperature protection adopts temperature fuse and TVS to establish ties to structurally carry out the design of heat transfer, inherited TVS and released surge current and the accurate function of clamping voltage, can be at TVS degradation in-process cut-off circuit simultaneously, the effectual electric conflagration that prevents TVS degradation and arouse improves voltage protection's stability.

Drawings

Fig. 1 is a schematic circuit diagram of a preferred embodiment of the present invention;

fig. 2 is an exploded view of a first embodiment of the present invention;

fig. 3 is an exploded view of a second embodiment of the present invention;

fig. 4 is a bottom view of an embodiment of the invention.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1, the utility model discloses a circuit schematic diagram of a specific embodiment of transient voltage suppressor with temperature protection, including transient voltage suppressor TVS, temperature fuse TCO, wherein, transient voltage suppressor TVS, temperature fuse TCO are established ties, and this series circuit's both ends are port P1 and port P2 respectively, draw out port P3 at transient voltage suppressor TVS, temperature fuse TCO's tie point, as the telecommand pin.

Example one

As shown in fig. 2, adopt the circuit as shown in fig. 1, the utility model discloses a transient voltage suppressor's product embodiment with temperature protection, including shell 1, TVS chip 2, TVS first electrode 22, TVS second electrode 21, temperature fuse 4, first extraction electrode 5, second extraction electrode 3, third extraction electrode 6 and apron 7, the both ends of temperature fuse 4 are connected to respectively on first extraction electrode 5 and second extraction electrode 3, and is concrete, and temperature fuse first electrode 41 and temperature fuse second electrode 42 are drawn forth at the both ends of temperature fuse 4, and in this embodiment, temperature fuse first electrode 41 and first extraction electrode 5 are the body structure, and temperature fuse second electrode 42 and third extraction electrode 6 are the body structure.

The TVS first electrode 22 and the TVS second electrode 21 are weldable metal electrodes, the TVS first electrode 22 and the TVS second electrode 21 are attached to the TVS chip 2 to lead out the TVS electrodes, the TVS second electrode 21 is electrically connected with the second lead-out electrode 3, and the TVS first electrode 22 is electrically connected with the temperature fuse second electrode 42. In order to ensure the minimum contact resistance and the rapid heat conduction from the TVS chip 2 to the thermal fuse 4, the second electrode 42 of the thermal fuse has a larger electrode area and is directly soldered to the first electrode of the TVS chip 2. When TVS chip 2 degradation generates heat, can conduct the heat to temperature fuse 4 fast, combines the overcurrent protection of temperature fuse 4 self, and temperature fuse 4 can blow fast in order to cut off the electric current, and wherein, the action temperature of temperature fuse 4 is 102 ℃ to 205 ℃, and this action temperature guarantees that the TVS chip can not break away from the circuit under the allowable operating temperature, in time breaks away from the circuit when the short circuit became invalid, prevents to take place the risk of catching fire.

Preferably, in order to ensure the minimum contact resistance and the rapid heat conduction from the TVS chip 2 to the thermal fuse 4, in other embodiments, the thermal fuse second electrode 42 is an electrode of an integral structure with the first electrode of the TVS chip 2.

The TVS chip 2 and the temperature fuse 4 are both accommodated in a cavity formed by the shell 1 and the cover plate 7, the first leading-out electrode 5, the second leading-out electrode 3 and the third leading-out electrode 6 are led out from the cover plate 7, the third leading-out electrode 6 is a remote signaling pin, and the TVS chip 2 or the temperature fuse 4 of the product can be monitored to determine whether abnormal conditions occur or not and can be led out through level change of the third leading-out electrode 6. Since the third extraction electrode 6 is a remote signaling pin and has polarity requirements, the first extraction electrode 5, the second extraction electrode 3 and the third extraction electrode 6 are respectively extracted from the P1, the P2 and the P3 through holes of the cover plate 7 and are asymmetrically distributed relative to the center of the cover plate 7 (namely the center of the product), so that the misplug is prevented, as shown in fig. 4.

In order to control the height of the product and reasonably and effectively utilize the cavity formed by the shell 1 and the cover plate 7, the temperature fuse 4 is arranged on the side of the TVS chip 2.

In order to enhance the insulating performance of the product, it is preferable that the cavity formed by the housing 1 and the cover plate 7 is filled with an insulating medium, and the insulating medium is a polymer material such as epoxy resin, silicon rubber, and the like. The filling of the insulating medium also enhances the mechanical impact resistance and the heat dissipation capability of the product, and plays a positive role in the performance of the product.

Example two

The second embodiment is a simplified version of the first embodiment, as shown in fig. 3, the second embodiment does not have a third extraction electrode, i.e., does not support a remote signaling function, and is suitable for general applications.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a transient voltage inhibitor with temperature protection, includes casing, TVS chip, first extraction electrode and second extraction electrode, its characterized in that: the first electrode of the temperature fuse is electrically connected with the first extraction electrode, the second electrode of the temperature fuse is electrically connected with the first electrode of the TVS chip, and the second electrode of the TVS chip is electrically connected with the second extraction electrode;

the TVS chip and the temperature fuse are contained in the shell, and the first leading-out electrode and the second leading-out electrode are led out of the shell.

2. The transient voltage suppressor with temperature protection of claim 1, wherein: the first electrode and the second electrode of the TVS chip are solderable metal electrodes.

3. The transient voltage suppressor with temperature protection of claim 2, wherein: the second electrode of the temperature fuse is directly welded on the first electrode of the TVS chip.

4. The transient voltage suppressor with temperature protection of claim 2, wherein: the second electrode of the temperature fuse and the first electrode of the TVS chip are integrated into a whole.

5. The transient voltage suppressor with temperature protection of claim 1, wherein: and a third extraction electrode is also arranged and is electrically connected with the second electrode of the temperature fuse.

6. The transient voltage suppressor with temperature protection of claim 5, wherein: the third extraction electrode and the second electrode of the temperature fuse are electrodes of an integrated structure.

7. The transient voltage suppressor with temperature protection of claim 1, wherein: the second extraction electrode and the second electrode of the TVS chip are electrodes of an integrated structure.

8. The transient voltage suppressor with temperature protection of claim 1, wherein: the temperature fuse is arranged on the side of the TVS chip.

9. The transient voltage suppressor with temperature protection of claim 1, wherein: the operating temperature of the temperature fuse is 102 ℃ to 205 ℃.

10. The transient voltage suppressor with temperature protection of claim 1, wherein: and an inner cavity of the shell is filled with an insulating medium.