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Inductance type PTC overcurrent protection element

A technology of overcurrent protection components and inductors, applied in the direction of current response resistors, resistors with positive temperature coefficients, etc., can solve the problems of miniaturization of unfavorable components, reduction of holding current value, unsafety, etc., and achieve stable circuits and Protect the PTC chip, slow down the action time, and offset the effect of peak current

Inactive Publication Date: 2018-01-09
上海萃励电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practical applications, when short-term large peak current shocks repeatedly appear in the circuit, the performance of the PTC resistor will be fatigued and deteriorated or even burned, bringing unsafe factors
For PTC chips with the same formula composition, if you want to increase the withstand voltage and current resistance of the chip, you need to increase the thickness and increase the component resistance, which will increase the component size or reduce the holding current value.
In addition, in some application environments such as motor systems, the delay action of PTC components is required in the case of a fault stall and high current, and the size needs to be increased to facilitate heat dissipation, which is not conducive to the miniaturization of components

Method used

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  • Inductance type PTC overcurrent protection element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] High-density polyethylene (HDPE), conductive filler carbon black and soft magnetic powder filler Cu-Zn ferrite are mixed according to the volume ratio of 65%: 30%: 5%. The inductive PTC composite material is obtained through banbury mixing. The above melted and mixed conductive composite material is rolled through an open mill to obtain an inductive PTC composite material core layer with a thickness of 0.30-0.40 mm.

[0014] Press the composite base layer separately figure 1 The shown is placed between two layers of nickel foil, and they are tightly bonded together by thermocompression. Then through the punching process, the conductive composite chip is punched into figure 1 The 3mm*4mm inductive PTC overcurrent protection element shown.

Embodiment 2

[0016] High density polyethylene (HDPE), conductive filler tungsten carbide and soft magnetic powder filler permalloy are mixed according to the volume ratio of 40%:45%:15%, and the inductive PTC composite material is obtained through internal mixing. The above melted and mixed conductive composite material is rolled through an open mill to obtain an inductive PTC composite material core layer with a thickness of 0.30-0.40 mm.

[0017] Press the composite base layer separately figure 1 The shown is placed between two layers of nickel-plated copper foil, and they are tightly bonded together by thermocompression. Then, through the punching process, the conductive composite material chip is punched into a 6mm*6mm inductive PTC overcurrent protection element.

Embodiment 3

[0019] The polymer PVDF, the conductive filler titanium diboride, the soft magnetic powder filler Ni-Zn ferrite, and the titanate coupling agent are mixed according to the volume ratio of 49%: 45%: 5%: 1%. An inductive PTC composite material is obtained. The composite material that has been melted and mixed is rolled by an open mill to obtain a composite material base layer with a thickness of 0.40-0.50 mm.

[0020] Press the composite base layer separately figure 1 The shown is placed between two layers of nickel foil, and they are tightly bonded together by thermocompression. Then, through the punching process, the conductive composite material chip is punched into a 5mm*8mm inductive PTC overcurrent protection element.

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Abstract

The invention discloses an inductance type PTC overcurrent protection element. The inductance type PTC overcurrent protection element is characterized by comprising a high-molecular composite materialcore layer and conductive metal foils compounded on two sides of the core layer, wherein the high-molecular composite material core layer comprises a high-molecular base material, a conductive filler, a soft magnetic powder filler and a coupling agent; the introduced soft magnetic powder filler achieves the effects of offsetting peak current and properly delaying PTC action time. When short-timepeak current occurs, the inductance type PTC overcurrent protection element generates inductive impedance, slows the current change rate and achieves the effects of stabilizing the circuit and protecting the PTC chip; the element is capable of eliminating the influence of short-time high-current impact under the condition that the holding current is not reduced; when the circuit is in a long-timehigh-current state, the PTC chip generates overcurrent, greatly improves the impedance and cuts off the circuit, so that the circuit is protected; in addition, the inductive impedance value is adjusted through the content of soft magnetic powder, so that the time response of the element is adjusted.

Description

technical field [0001] The invention relates to an inductive PTC overcurrent protection element, which belongs to the technical field of electronic materials. Background technique [0002] The polymer-based PTC composite material is made of a polymer matrix with conductive fillers. It has a low resistance value at normal temperatures. When a large current flows and causes a rapid temperature rise, its resistance will instantly increase by several orders of magnitude, making the circuit open. state. Therefore, polymer-based PTC composites are often used as resettable fuses to protect circuit components. [0003] In practical applications, when short-term large peak current shocks repeatedly appear in the circuit, the performance of the PTC resistor will be fatigued and deteriorated or even burned, bringing unsafe factors. For PTC chips with the same formula composition, if you want to increase the voltage and current resistance of the chip, you need to increase the thicknes...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L27/16C08L77/06C08L69/00C08K3/04C08K3/08C08K3/14C08K3/22C08K3/38H01C7/02H01C7/13
Inventor 汪元元
Owner 上海萃励电子科技有限公司