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Highly secure and non-combustible voltage-dependent resistor

A varistor, safety technology, applied in varistors, non-adjustable metal resistors, resistors, etc., can solve the problem of long fuse time of thermal fuses, and achieve the effect of preventing fire accidents

Inactive Publication Date: 2007-11-28
苏州中普电子有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes a certain amount of time for the heat of the varistor to be transferred to the thermal fuse when the varistor is heated, and the thermal fuse itself has a relatively long fusing time (7 to 10 seconds), so the thermal fuse often cannot respond to the above-mentioned varistor from heating to arcing. When the time is very short, the current is cut off in time before the varistor catches fire, and only when the varistor heats up slowly, it has a certain fire prevention effect

Method used

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  • Highly secure and non-combustible voltage-dependent resistor
  • Highly secure and non-combustible voltage-dependent resistor
  • Highly secure and non-combustible voltage-dependent resistor

Examples

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Effect test

no. 1 example

[0061] First embodiment: as shown in accompanying drawing 1 to accompanying drawing 3 a kind of high safety non-combustible varistor, it comprises the varistor substrate 1 with two opposite surfaces 12,13, is directly connected to described The first lead-out electrode 2 on one surface 12 of the varistor substrate 1 is directly connected to the second lead-out electrode 3 on the other surface 13 of the varistor substrate 1. Low-melting-point metal sheets 14 (such as tin sheets, tin alloy sheets, etc.) that can be melted when the temperature is 155-450° C. are respectively pasted on the surfaces 12 and 13, and there are no benign conductors between the low-melting-point metal sheets 14 on both sides. Phase electrical connection.

[0062] An insulating encapsulation layer 4 is wrapped on the outside of the varistor substrate 1, and one end of the first lead-out electrode 2 and the second lead-out electrode 3 respectively passes through the insulating encapsulation layer 4 and fa...

no. 2 example

[0069] Second embodiment: a kind of high safety non-combustible varistor as shown in accompanying drawing 4, it comprises the varistor substrate 1 that has two opposite surfaces 12,13, is directly connected to described varistor The first lead-out electrode 2 on one surface 12 of the substrate 1 is directly connected to the second lead-out electrode 3 on the other surface 13 of the piezoresistor substrate 1, and on the two opposite surfaces 12, 13 The low-melting-point metal conductive layers 5 that can be melted when the temperature is 155-450°C are respectively coated on them, and there is no good electrical connection between the low-melting-point metal conductive layers 5 on both sides, and the low-melting-point metal conducts electricity Layer 5 is glue or paint containing more than 50% low-melting point metal powder (such as pure tin flakes, tin-copper alloy flakes, tin-lead alloy flakes, etc.).

[0070] An insulating encapsulation layer 4 is wrapped on the outside of th...

no. 3 example

[0077] The third embodiment: a kind of high safety non-combustible varistor as shown in accompanying drawing 5, it comprises the varistor substrate 1 with two opposite surfaces 12,13, is directly connected to described varistor The first lead-out electrode 2 on one surface 12 of the substrate 1 is directly connected to the second lead-out electrode 3 on the other surface 13 of the piezoresistor substrate 1, and on the two opposite surfaces 12, 13 There are low-melting-point metal conductive layers 5 that can be melted when the temperature is 155-450° C., and an insulating coating 6 is provided between the low-melting-point metal conductive layer 5 and the first lead-out electrode 2. An insulating coating 6 is also arranged between the low-melting-point metal conducting layer 5 and the second lead-out electrode 3, and the insulating coating 6 makes the low-melting-point metal conducting layer 5 and the first lead-out electrode 2 are in an electrical insulation state, and the lo...

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Abstract

The invention disclose a high safe non-ignitable piezoresistor, which comprises the following parts: a piezoresistor chip with two corresponding surfaces, the first leading electrode electric connected with a surface of the piezoresistor chip, the second leading electrode electric connected with the other surface of the piezoresistor chip, wherein the outboards of two corresponding surfaces are provided with a low-melting point metal conductive layer which can melt at 155Deg.C-450Deg.C, the intermediate of two outboard low-melting point metal conductive layers doesn' t have electric connection of the good conductor. The invention guarantees that the current foldback fuse or the current foldback switch can break arc current quickly before the shell of the pieziresistor is on fire, which avoids the occurrence of fire.

Description

technical field [0001] The invention relates to a piezoresistor. Background technique [0002] The varistor will generate heat and burn under abnormal overvoltage, and some even cause the equipment to be completely burned, causing great economic losses. This is because the varistor is not only a burning heating element under the action of abnormal overvoltage, but also a large current limiting resistor, which leads to overcurrent protection fuses or overcurrent protection in equipment or lines. The switch cannot cut off the current flowing through the varistor, and the varistor will continue to heat and burn until the ceramic substrate undergoes partial melting (melting hole) and breakdown and causes an arc; the temperature of the arc is generally as high as several thousand degrees Celsius, and it will Intensifies the combustion and ignites the plastic casing of the circuit board and surrounding components and the plastic insulation of the wires, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/10H01C17/00
CPCY10T29/49082H01C7/126H01C1/144Y10T29/49087H01C7/102
Inventor 孙丹峰
Owner 苏州中普电子有限公司
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