WO2021012938A1 - 一种具有温度保护的瞬态电压抑制器 - Google Patents

一种具有温度保护的瞬态电压抑制器 Download PDF

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WO2021012938A1
WO2021012938A1 PCT/CN2020/100456 CN2020100456W WO2021012938A1 WO 2021012938 A1 WO2021012938 A1 WO 2021012938A1 CN 2020100456 W CN2020100456 W CN 2020100456W WO 2021012938 A1 WO2021012938 A1 WO 2021012938A1
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electrode
tvs
transient voltage
voltage suppressor
lead
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PCT/CN2020/100456
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English (en)
French (fr)
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罗禄全
张祥贵
王小楼
王彦军
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厦门赛尔特电子有限公司
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Publication of WO2021012938A1 publication Critical patent/WO2021012938A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
    • H01L23/62—Protection against overvoltage, e.g. fuses, shunts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Definitions

  • This application relates to the technical field of overvoltage protection, and in particular to a transient voltage suppressor with temperature protection.
  • 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.
  • the inrush current TVS has a peak power of up to 1000000W. It is used at the input port of the power supply as a clamp protection, making full use of its low clamp voltage characteristics, but its leakage current increases and failures and short-circuit failures may cause potential Fire hazards have a great impact on the safety of personnel and equipment.
  • the technical problem to be solved by this application is to provide a transient voltage suppressor with temperature protection, which can disconnect the damaged TVS from the circuit during the failure of the TVS to avoid fire.
  • the present application provides a transient voltage suppressor with temperature protection, which includes a housing, a TVS chip, a first lead electrode and a second lead electrode, and also includes a thermal fuse.
  • the electrode is electrically connected to the first lead electrode
  • the second electrode of the thermal fuse is electrically connected to the first electrode of the TVS chip
  • the second electrode of the TVS chip is electrically connected to the second lead electrode
  • the TVS chip is electrically connected to
  • the thermal fuse is contained in the housing, and the first and second extraction electrodes are led out from the housing.
  • the first electrode and the second electrode of the TVS chip are weldable metal electrodes.
  • the second electrode of the thermal fuse is directly welded to the first electrode of the TVS chip.
  • the second electrode of the thermal fuse and the first electrode of the TVS chip are an integrated electrode.
  • the transient voltage suppressor is further provided with a third extraction electrode, and the third extraction electrode is electrically connected to the second electrode of the thermal fuse.
  • the third extraction electrode and the second electrode of the thermal fuse are electrodes of an integral structure.
  • the second extraction electrode and the second electrode of the TVS chip are electrodes of an integral structure.
  • the thermal fuse is arranged on the side of the TVS chip.
  • the operating temperature of the thermal fuse is 102°C to 205°C.
  • the inner cavity of the housing is filled with an insulating medium.
  • the insulating medium is epoxy resin or silicon rubber.
  • the transient voltage suppressor with temperature protection of the present application adopts a thermal fuse in series with the TVS and a design of heat transfer in the structure. It inherits the functions of the TVS to discharge surge current and accurately clamp the voltage, and at the same time, it can degrade the TVS. Cut off the circuit in the process, effectively prevent the electrical fire caused by TVS degradation, and improve the stability of voltage protection.
  • Fig. 1 is a schematic circuit diagram of a preferred embodiment of the present application
  • FIG. 2 is an exploded view of Embodiment 1 of the present application.
  • Figure 3 is an exploded view of the second embodiment of the present application.
  • Figure 4 is a bottom view of an embodiment of the present application.
  • the application discloses a circuit schematic diagram of a specific embodiment of a transient voltage suppressor with temperature protection, including a transient voltage suppressor TVS and a thermal fuse TCO, wherein the transient voltage suppressor TVS and thermal fuse TCO are connected in series.
  • the two ends of the series circuit are port P1 and port P2 respectively.
  • Port P3 is led out at the connection point of transient voltage suppressor TVS and thermal fuse TCO as a remote signal pin.
  • this application discloses a product embodiment of a transient voltage suppressor with temperature protection, including a housing 1, a TVS chip 2, a TVS first electrode 22, and a TVS second Electrode 21, thermal fuse 4, first lead electrode 5, second lead electrode 3, third lead electrode 6, and cover plate 7. Both ends of thermal fuse 4 are connected to first lead electrode 5 and second lead electrode 3, respectively Specifically, the first electrode 41 of the temperature fuse and the second electrode 42 of the temperature fuse are led out at both ends of the temperature fuse 4. In this embodiment, the first electrode 41 of the temperature fuse and the first lead electrode 5 are integrated, and the temperature fuse The second electrode 42 and the third extraction electrode 6 are integrally structured.
  • 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 electrode, and the TVS second electrode 21 and the second lead out
  • the electrode 3 is electrically connected, and the TVS first electrode 22 and the thermal fuse second electrode 42 are electrically connected.
  • the second electrode 42 of the thermal fuse has a larger electrode area and is directly welded to the first electrode of the TVS chip 2. When the TVS chip 2 degrades and generates heat, it can quickly conduct heat to the thermal fuse 4.
  • the thermal fuse 4 can quickly blow to cut off the current.
  • the operating temperature of the thermal fuse 4 is 102°C to 205°C, this operating temperature ensures that the TVS chip will not be separated from the circuit under the allowable operating temperature, and will be separated from the circuit in time when the short circuit fails to prevent the risk of fire.
  • the second electrode 42 of the thermal fuse and the first electrode of the TVS chip 2 are an integrated electrode.
  • the TVS chip 2 and the thermal fuse 4 are both contained in the cavity formed by the housing 1 and the cover plate 7.
  • the first lead electrode 5, the second lead electrode 3, and the third lead electrode 6 are drawn from the cover plate 7, and the third lead electrode 6 is the remote signal pin, which can monitor whether the TVS chip 2 or the thermal fuse 4 of this product is abnormal, and it is led out by the level change of the third lead electrode 6.
  • the third extraction electrode 6 is a remote signal pin and requires polarity
  • the first extraction electrode 5, the second extraction electrode 3, and the third extraction electrode 6 are respectively drawn from the P1, P2, and P3 through holes of the cover plate 7. , Relative to the center of the cover 7 (that is, the center of the product) is distributed asymmetrically to prevent mis-insertion, as shown in Figure 4.
  • the thermal fuse 4 is arranged at the side of the TVS chip 2.
  • the cavity formed by the housing 1 and the cover plate 7 is filled with an insulating medium, which is a polymer material such as epoxy resin and silicon rubber. Filling with insulating medium also enhances the resistance to mechanical impact and heat dissipation of the product, which has a positive effect on product performance.
  • an insulating medium which is a polymer material such as epoxy resin and silicon rubber. Filling with insulating medium also enhances the resistance to mechanical impact and heat dissipation of the product, which has a positive effect on product performance.
  • the second embodiment is a simplified version of the first embodiment. As shown in FIG. 3, the second embodiment does not lead to the third lead electrode, that is, does not support the remote signal function, and is suitable for general occasions.
  • the transient voltage suppressor with temperature protection of the present application adopts a thermal fuse in series with the TVS and a design of heat transfer in the structure. It inherits the functions of the TVS to discharge surge current and accurately clamp the voltage, and at the same time, it can degrade the TVS. Cut off the circuit in the process, effectively prevent the electrical fire caused by TVS degradation, and improve the stability of voltage protection.
  • the device embodiments described above are merely illustrative.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.
  • any reference signs placed between parentheses should not be constructed as a limitation to the claims.
  • the word “comprising” does not exclude the presence of elements or steps not listed in the claims.
  • the word “a” or “an” preceding an element does not exclude the presence of multiple such elements.
  • the application can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims enumerating several devices, several of these devices may be embodied by the same hardware item.
  • the use of the words first, second, and third, etc. do not indicate any order. These words can be interpreted as names.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Fuses (AREA)

Abstract

一种具有温度保护的瞬态电压抑制器，包括外壳(1)、盖板(7)、TVS芯片(2)、第一引出电极(5)和第二引出电极(3)，还包括温度保险丝(4)，所述温度保险丝(4)的第一电极(41)和第一引出电极(5)电连接，所述温度保险丝(4)的第二电极(42)和TVS芯片的第一电极(22)电连接，所述TVS芯片(2)的第二电极(21)和所述第二引出电极(3)电连接；所述TVS芯片(2)和所述温度保险丝(4)容置于所述外壳(1)和盖板(7)形成的空腔内，所述第一引出电极(5)和所述第二引出电极(3)从所述盖板(7)引出。该方案采用温度保险丝对TVS进行过热保护，在TVS失效的过程中产生的热量导致温度保险丝熔断，从而将受损的TVS脱离电流，避免火灾产生，该实施例具有结构简单、产品稳定可靠等特点。

Description

一种具有温度保护的瞬态电压抑制器
本申请要求在2019年7月19日提交中国专利局、申请号为201921138378.2、发明名称为“一种具有过热保护功能的瞬态电压抑制器”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及过电压保护技术领域，尤其涉及一种具有温度保护的瞬态电压抑制器。
背景技术
TVS(瞬态电压抑制器，Transient Voltage Suppressor)装置是一种连接在电信和网络设备中的过电压保护装置，其主要用于泄放浪涌电流和准确钳制电压。
近年来，随着5G通信技术的发展，通信基站的电源功率上升，基站设备体积减小，对元器件的集成程度要求更高，导致一些开关管和芯片的耐压水平降低，将能够承受10kA的浪涌电流的TVS，其峰值功率高达1000000W，用在电源的输入端口作为钳位防护，充分的利用其钳位电压低的特点，但是，其漏电流增大失效和短路失效时可能造成潜在火灾隐患，对人员以及设备的安全性影响很大。
发明内容
有鉴于现有技术的上述缺陷，本申请所要解决的技术问题是提供一种具有温度保护的瞬态电压抑制器，在TVS失效的过程中将受损的TVS脱离电路，避免火灾产生。
为实现上述目的，本申请提供了一种具有温度保护的瞬态电压抑制器，包括壳体、TVS芯片、第一引出电极和第二引出电极，还包括温度保险丝，所述温度保险丝的第一电极和第一引出电极电连接，所述温度保险丝的第二电极和TVS芯片的第一电极电连接，所述TVS芯片的第二电极和所述第二引出电极电连接；所述TVS芯片和所述温度保险丝容置于所述壳体内，所述第一引出电极和所述第二引出电极从所述壳体引 出。
优选地，所述TVS芯片的第一电极和第二电极为可焊接的金属电极。
优选地，所述温度保险丝的第二电极是直接焊接在所述TVS芯片的第一电极上。
优选地，所述温度保险丝的第二电极与所述TVS芯片的第一电极为一体结构的电极。
优选地，所述瞬态电压抑制器还设有第三引出电极，所述第三引出电极和所述温度保险丝的第二电极电连接。
优选地，所述第三引出电极和所述温度保险丝的第二电极是一体结构的电极。
优选地，所述第二引出电极和所述TVS芯片的第二电极是一体结构的电极。
优选地，所述温度保险丝设置在TVS芯片的侧方。
优选地，所述温度保险丝的动作温度为102℃至205℃。
优选地，所述壳体的内腔填充有绝缘介质。
优选地，所述绝缘介质是环氧树脂或硅橡胶。
本申请的具有温度保护的瞬态电压抑制器，采用温度保险丝与TVS串联，并在结构上进行热传递的设计，继承了TVS泄放浪涌电流和准确钳制电压的功能，同时能够在TVS劣化过程中切断电路，有效的防止TVS劣化引起的电气火灾，提高电压保护的稳定性。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的之一、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术 人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请的一个较佳实施例的电路原理图；
图2是本申请的实施例一的***图；
图3是本申请的实施例二的***图；
图4是本申请的实施例的底视图。
具体实施例
为进一步说明各实施例，本申请提供有附图。这些附图为本申请揭露内容的一部分，其主要用以说明实施例，并可配合说明书的相关描述来解释实施例的运作原理。配合参考这些内容，本领域普通技术人员应能理解其他可能的实施方式以及本申请的优点。图中的组件并未按比例绘制，而类似的组件符号通常用来表示类似的组件。
现结合附图和具体实施方式对本申请进一步说明。
如图1所示，本申请公开了一种具有温度保护的瞬态电压抑制器的一具体实施例的电路原理图，包括瞬态电压抑制器TVS、温度保险丝TCO，其中，瞬态电压抑制器TVS、温度保险丝TCO串联，该串联电路的两端分别为端口P1和端口P2，在瞬态电压抑制器TVS、温度保险丝TCO的连接点引出端口P3，作为遥信引脚。
实施例一
如图2所示，采用如图1所示的电路，本申请公开了具有温度保护的瞬态电压抑制器的产品实施例，包括外壳1、TVS芯片2、TVS第一电极22、TVS第二电极21、温度保险丝4、第一引出电极5、第二引出电极3、第三引出电极6和盖板7，温度保险丝4的两端分别连接到第一引出电极5和第二引出电极3上，具体的，温度保险丝4的两端引出温度保险丝第一电极41和温度保险丝第二电极42，在本实施例中，温度保险丝第一电极41和第一引出电极5是一体结构的，温度保险丝第二电极42和第三引出电极6是一体结构的。
TVS第一电极22和TVS第二电极21是可焊接的金属电极，TVS第一电极22和TVS第二电极21贴合于TVS芯片2上，引出TVS电极， TVS第二电极21和第二引出电极3电连接，TVS第一电极22和温度保险丝第二电极42电连接。为保证TVS芯片2到温度保险丝4的接触电阻最小及快速热传导，温度保险丝第二电极42具有较大的电极面积，且直接焊接在所述TVS芯片2的第一电极上。当TVS芯片2劣化发热时，可将热量快速传导给温度保险丝4，结合温度保险丝4自身的过流保护，温度保险丝4能快速熔断以切断电流，其中，温度保险丝4的动作温度为102℃至205℃,该动作温度保证TVS芯片在允许工作温度下不会从电路脱离，在短路失效时及时从电路脱离，防止发生起火的风险。
优选地，为保证TVS芯片2到温度保险丝4的接触电阻最小及快速热传导，在其它实施例中，温度保险丝第二电极42与TVS芯片2的第一电极为一体结构的电极。
TVS芯片2和温度保险丝4均容置于外壳1和盖板7形成的空腔内，第一引出电极5、第二引出电极3、第三引出电极6从盖板7引出，第三引出电极6是遥信引脚，可监测本产品的TVS芯片2或温度保险丝4是否出现异常状况，并通过第三引出电极6的电平变化引出。由于第三引出电极6为遥信引脚，有极性要求，因此，第一引出电极5、第二引出电极3和第三引出电极6分别从盖板7的P1、P2和P3通孔引出，相对盖板7的中心(即本产品的中心)呈不对称分布，防止误插，如图4所示。
为控制产品的高度及合理有效利用外壳1和盖板7形成的空腔，温度保险丝4设置在TVS芯片2侧方。
为了增强本产品的绝缘性能，优选的，在外壳1和盖板7形成的空腔内填充有绝缘介质，该绝缘介质为环氧树脂、硅橡胶等高分子材料。填充绝缘介质，还增强了本产品的抗机械冲击能力和散热能力，对产品性能起到积极作用。
实施例二
实施例二是实施例一的简化版本，如图3所示，实施例二没有引出第三引出电极，即不支持遥信功能，适合一般场合应用。
本申请的具有温度保护的瞬态电压抑制器，采用温度保险丝与TVS串联，并在结构上进行热传递的设计，继承了TVS泄放浪涌电流和准确 钳制电压的功能，同时能够在TVS劣化过程中切断电路，有效的防止TVS劣化引起的电气火灾，提高电压保护的稳定性。
尽管结合优选实施方案具体展示和介绍了本申请，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本申请的精神和范围内，在形式上和细节上可以对本申请做出各种变化，均为本申请的保护范围。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
本文中所称的“一个实施例”、“实施例”或者“一个或者多个实施例”意味着，结合实施例描述的特定特征、结构或者特性包括在本申请的至少一个实施例中。此外，请注意，这里“在一个实施例中”的词语例子不一定全指同一个实施例。
在此处所提供的说明书中，说明了大量具体细节。然而，能够理解，本申请的实施例可以在没有这些具体细节的情况下被实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。
在权利要求中，不应将位于括号之间的任何参考符号构造成对权利要求的限制。单词“包含”不排除存在未列在权利要求中的元件或步骤。位于元件之前的单词“一”或“一个”不排除存在多个这样的元件。本申请可以借助于包括有若干不同元件的硬件以及借助于适当编程的计算机来实现。在列举了若干装置的单元权利要求中，这些装置中的若干个可以是通过同一个硬件项来具体体现。单词第一、第二、以及第三等的使用不表示任何顺序。可将这些单词解释为名称。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其 限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (10)

  1. 一种具有温度保护的瞬态电压抑制器，包括壳体、TVS芯片、第一引出电极和第二引出电极，其特征在于：还包括温度保险丝，所述温度保险丝的第一电极和第一引出电极电连接，所述温度保险丝的第二电极和TVS芯片的第一电极电连接，所述TVS芯片的第二电极和所述第二引出电极电连接；
    所述TVS芯片和所述温度保险丝容置于所述壳体内，所述第一引出电极和所述第二引出电极从所述壳体引出。
  2. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：所述TVS芯片的第一电极和第二电极为可焊接的金属电极。
  3. 如权利要求2所述的具有温度保护的瞬态电压抑制器，其特征在于：所述温度保险丝的第二电极是直接焊接在所述TVS芯片的第一电极上。
  4. 如权利要求2所述的具有温度保护的瞬态电压抑制器，其特征在于：所述温度保险丝的第二电极与所述TVS芯片的第一电极为一体结构的电极。
  5. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：还设有第三引出电极，所述第三引出电极和所述温度保险丝的第二电极电连接。
  6. 如权利要求5所述的具有温度保护的瞬态电压抑制器，其特征在于：所述第三引出电极和所述温度保险丝的第二电极是一体结构的电极。
  7. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：所述第二引出电极和所述TVS芯片的第二电极是一体结构的电极。
  8. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：所述温度保险丝设置在TVS芯片的侧方。
  9. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：所述温度保险丝的动作温度为102℃至205℃。
  10. 如权利要求1所述的具有温度保护的瞬态电压抑制器，其特征在于：所述壳体的内腔填充有绝缘介质。
PCT/CN2020/100456 2019-07-19 2020-07-06 一种具有温度保护的瞬态电压抑制器 WO2021012938A1 (zh)

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CN216145603U (zh) * 2021-08-31 2022-03-29 厦门赛尔特电子有限公司 一种热保护型的瞬态电压抑制器

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