High voltage withstanding over current protection element and its manufacturing method
A technology for protecting components and manufacturing methods, which is applied in the direction of resistance manufacturing, electrical components, and current-responsive resistors. The effect of uniform density and increased production speed
Inactive Publication Date: 2009-03-25
KUNSHAN POLYSTAR ELECTRONICS
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Problems solved by technology
In addition, if cobalt 60 (Co 60 ) γ-ray irradiation, it must take a considerable amount of time because of its low energy, and reduce the throughput (throughput)
If electron beam (E-beam) is used for irradiation, it will often generate high heat and cause internal stress, and its manufacturing process is not easy to control, which will affect the quality of output, and its manufacturing cost is relatively high
Method used
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Embodiment Construction
[0027] An embodiment of the overcurrent protection device and its manufacturing method of the present invention will be described below with the aid of figures.
[0028] figure 1 It is a sheet-like polymer substrate 10, which is made through a part of chemical cross-linking process (including two steps of mixing and pressing). First, 3.85 g of a first polymer (comprising 8% of a copolymer of glycidyl methylacrylate (GMA) and polyethylene), a second polymer (comprising 0.9% of maleic anhydride) Branched polyethylene (maleic anhydride graftedpolyethylene)) 1.65 grams, carbon black RU43015.4 grams, magnesium hydroxide 11.55 grams, Talc6.60 grams and HDPE15.95 grams are added in a batch mixer and mixed, and by controlling The process conditions of kneading: temperature 160° C., rotation speed 60 rpm and time 9 minutes, to form a polymer mixture with the first degree of crosslinking and the characteristics of crystalline thermoplastics. After mixing, the polymer mixture was hot-p...
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The invention relates to an over-current protector, which comprises: a substrate with chemical crosslink positive-temperature factor (PTC) and two electrode foils, wherein its production comprises: a, providing the macromolecule mixture with PTC character, which has the first polymer with function group X, the second polymer with the function group Y, and the conductive powder, heating it into the polymer softening point to mixed melt, to obtain the character of crystal thermal plastic; b, compressing the macromolecule mixture into sheet macromolecule substrate; c, stacking the sheet macromolecule substrates into one-layer stacked polymer layer; d, connecting two electrode foils into the upper and lower surfaces of said polymer layer; e, thermally compressing the upper and lower electrode foils and the stacked polymer layer, to generate the original chemical crosslink reaction of function group X and function group Y, to form one chemical crosslink PTC substrate. The inventive substrate can resist the high voltage at 600V.
Description
technical field [0001] The present invention relates to a high voltage overcurrent protection element and its manufacturing method, in particular to a high voltage overcurrent protection element with positive temperature coefficient (Positive Temperature Coefficient; PTC) characteristics and its manufacturing method. Background technique [0002] The resistance value of conventional PTC elements responds quite sensitively to temperature changes. When the PTC element is in normal use, its resistance can maintain the lowest value so that the circuit can operate normally. However, when the temperature rises to a critical temperature due to an over-current or over-temperature phenomenon, its resistance value instantly jumps to a high resistance state (for example, 10 4 ohm) and reverse the excess current to achieve the purpose of protecting the battery or circuit components. Since the PTC element can effectively protect electronic products, it has been seen that the PTC eleme...
Claims
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IPC IPC(8): H01C7/02H01C7/13H01C17/00
Inventor 蔡东成朱复华王绍裘
Owner KUNSHAN POLYSTAR ELECTRONICS