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Composite circuit protection device

A circuit protection, composite technology, applied in the direction of overvoltage protection resistors, varistors, resistance terminals/electrodes, etc., can solve the problems of loss of function, damage, and diode burnout of composite circuit protection devices, and achieve excellent tolerance. The effect of reliability and reliability

Pending Publication Date: 2022-07-29
FUZETEC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the combination of PTC elements and diodes can provide over-current (over-current) and over-voltage (over-voltage) protection to the combined composite circuit protection device, the diodes can only withstand power surges for a short time (for example, 0.001 seconds).
That is to say, if the surge time exceeds the cut-off time interval, the diode will be burned or damaged due to over-current or over-voltage, resulting in permanent loss of function of the composite circuit protection device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056]

[0057] 12.5g HDPE (purchased from Taiwan Plastics Industry Co., Ltd., product model: HDPE9002) as a non-grafted olefin polymer, 12.5g HDPE grafted with maleic anhydride (purchased from DuPont, product model: MB100D) As the carboxylic acid anhydride-grafted olefin-based polymer, 25 g of carbon black powder (purchased from Columbian Chemicals, product model: Raven 430UB) was used as a conductive filler.

[0058] The above ingredients were mixed in a mixer (brand: Brabender), and the ingredients were mixed for 10 min under the conditions of a temperature of 200° C. and a stirring speed of 30 rpm.

[0059] The above-obtained batching mixture is placed in the mold, and the hot-pressing temperature is 200 ° C and the hot-pressing pressure is 80 kg / cm 2 The conditions of hot pressing for 4 min to form a PTC polymer layer sheet with a thickness of 0.6 mm. The sheet was taken out from the mold, and its two opposite surfaces were in contact with two copper foils (respectivel...

Embodiment 2

[0065]

[0066] The process conditions of the composite circuit protection device of E2 are similar to those of E1, the difference lies in that after the PPTC small pieces are irradiated with gamma rays, a hole is drilled in the central part of each PPTC small piece of E2 to form the following image 3 Combined circuit protection device shown. Each perforation is made of circular section (0.15mm in diameter and 0.0177mm in circular area) 2 ) is defined by the hole-defining wall.

Embodiment 3 and 4

[0067]

[0068] The process conditions of the composite circuit protection devices of E3 and E4 are similar to those of E1 and E2 respectively, the difference is that in E3 and E4, the PPTC chip and the TVS diode are connected in parallel. After irradiating the PPTC small pieces with gamma rays, the first conductive lead, the second conductive lead and the third conductive lead are respectively welded to one of the two copper foils of each PPTC small piece and to the two electrodes of the TVS diode. form as Figure 4 Combined circuit protection device shown.

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Abstract

A composite circuit protection device comprises a positive temperature coefficient (PTC) element, a diode element, a first conductive lead and a second conductive lead. The PTC element comprises a PTC layer, a first electrode layer and a second electrode layer, the PTC layer is provided with two opposite surfaces, and the first electrode layer and the second electrode layer are arranged on the two opposite surfaces of the PTC layer respectively. The diode element is connected to the second electrode layer. The first conductive lead is connected to the first electrode layer, and the second conductive lead is connected to the diode element. The PTC element has a rated voltage ranging from 50% to 250% of a collapse voltage measured by the diode element at 1 mA. The composite circuit protection device has excellent tolerance, and the PTC element can protect the diode element from being burnt out in the presence of overcurrent and overvoltage.

Description

technical field [0001] The invention relates to a composite circuit protection device, in particular to a composite circuit protection device comprising a positive temperature coefficient (PTC) element and a diode element, the PTC element has a rated voltage ranging from 50% to 250% of the breakdown voltage measured at 1mA for this diode element. Background technique [0002] US Patent US 8,508,328B1 discloses an insertable polymer positive temperature coefficient (PPTC) over-current protection device, see figure 1 , which includes two electrodes 30 , a first conductive lead 50 and a second conductive lead 60 respectively connected to the electrodes 30 , and a PTC polymer substrate 20 laminated between the electrodes 30 . The PTC polymer substrate 20 may be formed with holes 40 having an effective volume to accommodate thermal expansion of the PTC polymer substrate 20 as the temperature increases. [0003] Electrical characteristics such as operating current and high-volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/13H01C7/12H01C7/02H01C1/14
CPCH01C7/13H01C7/126H01C7/02H01C1/1406
Inventor 陈继圣江长鸿
Owner FUZETEC TECHNOLOGY CO LTD