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Varistor with alloy-type temperature fuse

A technology of thermal fuses and varistors, applied in varistors, varistor cores, overvoltage protection resistors, etc., can solve problems such as easy failure, failure, and weak high-current impact capability, and achieve heat transfer Fast speed, convenient and simple installation, and wide application range

Inactive Publication Date: 2007-04-25
徐忠厚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of whether varistors are used in power lines or electronic circuits, if various types of transient overvoltages occur frequently, the varistors will operate frequently to suppress the overvoltage amplitude and absorb and release surge energy to protect electrical equipment and components, which will inevitably lead to performance degradation or even failure of the varistor; when the varistor receives a temporary overvoltage, the varistor will rapidly and locally break down and cause fire and combustion
Existing varistors with failure protection are either complex in structure, such as the traditional mode fast thermal tripping device and Chinese patent 02222055.0; Weak and easy to fail, such as the traditional shrapnel type thermal tripping device, the external organic type thermal fuse, the external alloy thermal fuse and Chinese patent 00237913.9.

Method used

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  • Varistor with alloy-type temperature fuse
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  • Varistor with alloy-type temperature fuse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] As shown in Figure 2A, the surface of the varistor 2 and the alloy type thermal fuse 4 are placed in close proximity to the surface of the cavity 1, and the cavity 1 is equipped with an alloy flux 7, and then the cavity 1 is sealed with an epoxy resin sealing material 6. The opening of the cavity is sealed, and the pin 3 of the piezoresistor and the pin 5 of the fuse are arranged outside the opening of the cavity 1 . When the varistor 2 heats up due to various factors, the heat can be transferred to the surrounding alloy flux 7 through its surface layer, and then the alloy flux 7 transfers the heat to the alloy fuse 4 until the alloy is heated and melted. Under the action of the flux 7, it rapidly shrinks toward the two fuse pins 5 (as shown in FIG. 2 ), thereby cutting off the circuit, and detaching the deteriorating piezoresistor 2 from the circuit.

Embodiment 2

[0038] As shown in Figure 2B, the alloy type thermal fuse 4 and the flux blowing agent are first put into a small cavity 8 made of ceramics or other high thermal conductivity and high insulation materials, and the mouth of the small cavity 8 is sealed with epoxy resin 6 Sealing, the small cavity 8 is close to one surface of the piezoresistor 2, and then both are put into the airtight chamber 1 together, and then the opening of the chamber 1 is sealed with epoxy resin sealing material 6; because the piezoresistor 2 When various factors cause heat generation, the heat can be transferred to the small cavity 8 through its surface layer, and then the small cavity 8 will transfer the heat to the alloy fuse 4 until the alloy melts after being heated and quickly flows to the fuse under the action of the alloy flux 7. The two fuse pins 5 contract, thereby cutting off the circuit, and the piezoresistor 2 that is about to deteriorate is separated from the circuit.

Embodiment 3

[0040] Fig. 3 A is the structural representation of two pin embodiments of the present invention, and Fig. 3 B is the circuit schematic diagram of two pin embodiments of the present invention, on the structural basis of embodiment 2, a pin 3a of piezoresistor 2 and One pin 5a of the alloy type thermal fuse 4 is connected and sealed in the cavity; the other pin 3b of the piezoresistor 2 and the other pin 5b of the alloy type thermal fuse 4 respectively extend outside the cavity; The resin sealing material 6 seals the opening of the cavity 1 .

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PUM

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Abstract

The invention relates to a voltage-sensitive resistance with alloy temperature safety fuse. Wherein, the invention is characterized in that: the resistance and alloy temperature safety fuse are in one sealed cavity, with compact surfaces; its pins are outside the cavity; the cavity contains alloy fusion agent. The invention has simple installment; and since the surfaces of resistance and safety fuse are nearby, via the alloy fusion agent, the fused alloy will contract to two pins into balls, with high speed. The invention can select different alloys based on real need, matched with different resistances, to obtain the voltage-sensitive resistance with failure protection. The invention has wide application.

Description

technical field [0001] The invention relates to a varistor with an alloy temperature fuse, which itself has a failure protection function, and is especially suitable for a zinc oxide varistor and used for overvoltage protection. Background technique [0002] With its superior nonlinear volt-ampere characteristics, varistors are widely used as overvoltage protection and surge absorbing components for lines, equipment and components. Regardless of whether varistors are used in power lines or electronic circuits, if various types of transient overvoltages occur frequently, varistors will frequently operate to suppress the overvoltage amplitude and absorb and release surge energy to protect electrical equipment and components, which will inevitably lead to performance degradation or even failure of the varistor; when the varistor is subjected to a temporary overvoltage, the varistor will quickly and locally break down and cause fire and combustion. Existing varistors with failu...

Claims

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Application Information

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IPC IPC(8): H01C7/10H01C7/112H01C7/12
Inventor 徐忠厚
Owner 徐忠厚