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Over-current protection element with protective shell

A technology for protecting shells and components, applied to resistors with positive temperature coefficients, resistors with current response, etc., can solve the problems of not being able to enter the high-resistance state and not being able to achieve over-current protection, etc.

Pending Publication Date: 2017-06-20
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the PTC thermistor cannot expand due to external stress or the surrounding space, it cannot enter the high resistance state and cannot achieve the purpose of overcurrent protection

Method used

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  • Over-current protection element with protective shell
  • Over-current protection element with protective shell
  • Over-current protection element with protective shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A SMD type PTC thermistor such as figure 1 As shown, the polymer core material composed of the polymer substrate and the conductive filler is closely attached to the metal electrode sheets on both sides to form a sheet of composite material. This sheet is prepared into an SMD type PTC thermistor through a series of PCB processes. The chip 10 with the positive temperature effect of resistance includes a polymer core material 11 and upper and lower metal electrode sheets 12, 13, and the upper and lower metal electrode sheets 12 , The upper and lower surfaces of 13 have upper and lower insulating layers 14, 15, metal foil 16, and upper electrodes one and two 17a, 17b; lower electrodes one and two 18a, 18b.

[0044] Such as figure 2 As shown, a protective shell 21 covers the outside of the SMD type PTC thermistor, and the inner space of the protective shell 21 is larger than the SMD type PTC thermistor, so that the protective shell 21 and the SMD type PTC thermistor Chip...

Embodiment 2

[0047] The PTC thermistor of the present embodiment is identical with embodiment 1, is the SMD type PTC thermistor, but in the SMD type PTC thermistor, a protective shell 21 ' with openings on both sides is added, and its three-dimensional structure schematic diagram is as follows image 3shown. The two openings of the protective shell 21' are on two adjacent surfaces, namely the front and the bottom, and the lower end electrodes 1, 2 18a, 18b of the PTC thermistor should be located on the surface where one of the openings is located, and slightly higher than this opening on the surface. The inner wall of the protective shell 21' is provided with a support rod or a boss 22', and is fixedly connected with the first and second electrodes 17a, 17b of the PTC thermistor upper end electrodes with an adhesive medium 23'. The protective shell 21' can protect the PTC thermistor from the upper pressure. At the same time, the protective shell 21' can be bonded to the PCB protection bo...

Embodiment 3

[0049] The PTC thermistor of this embodiment is the same as that of Embodiment 1, and is an SMD type PTC thermistor, but a protective shell 21'' with openings on three sides is added to the SMD type PTC thermistor, and the lower terminal electrode of the PTC thermistor is , 18a, 18b are located on the surface where one of the openings is located, and are slightly higher than the surface where the opening is located. There is no opening on the other side parallel to this side, which can protect the PTC thermistor from the upper pressure. The other two openings of the protective shell 21'' can be in adjacent positions, such as Figure 4 As shown, the protective shell 21'' is open on the front, side and lower sides; it can also be in a parallel position; as Figure 5 The front and rear sides and the lower side of the protective shell 21'' shown are open.

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Abstract

The invention discloses an over-current protection element with a protective shell. The over-current protection element comprises: (a) at least one PTC thermistor, consisting of a chip having a resistance positive temperature effect and a conductive component; (b) at least one protective shell, covering the PTC thermistor, wherein the internal space of the shell is larger than the PTC thermistor, so the protective shell cannot be in contact with the chip, having the resistance positive temperature effect, of the PTC thermistor. By covering the PTC thermistor with the protective shell, delayed protection or false protection for the PTC thermistor due to exogenic actions such as extrusion and injection molding can be prevented; meanwhile, since the internal space of the protective shell is larger than the PTC thermistor, a sufficient expansion space can be guaranteed for the PTC thermistor all the time, so the over-current protection element can be applied to the fields with more complicated assembly conditions.

Description

technical field [0001] The invention relates to an overcurrent protection element, especially a PTC thermistor with a protective shell. Background technique [0002] PTC thermistor has the characteristics of sensitive response to temperature changes, and can maintain a low resistance value under normal temperature in the circuit, and when over-current or over-temperature occurs in the circuit, its resistance will instantly increase to a high resistance value , so that the circuit is in an open circuit state to achieve the purpose of protecting circuit components. The PTC thermistor is connected to the circuit by reflow soldering, resistance welding or laser welding, which is easy to operate and suitable for automatic operation. Therefore, such overcurrent protection components are widely used in electronic circuits. [0003] PTC thermistors mainly have four structures: SMD type, strip pin type, SMT type and plug-in type. The over-current and over-temperature protection fun...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C7/13
CPCH01C7/02H01C7/13
Inventor 刘兵刘玉堂高道华方勇杨铨铨吴国臣
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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