The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2018
Filed:
Sep. 21, 2017
Polytronics Technology Corp., Hsinchu, TW;
Hsiu Che Yen, Taoyuan, TW;
Yung Hsien Chang, Douliu, TW;
Zhen Yu Dong, Tainan, TW;
Yao Te Chang, Linnei Township, Yunlin County, TW;
David Shau Chew Wang, Taipei, TW;
Polytronics Technology Corp., Hsinchu, TW;
Abstract
An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a resistivity less than 0.05 Ω·cm and comprises a polymer matrix, a conductive ceramic filler and a carbon-containing conductive filler. The polymer matrix comprises a fluoropolymer having a melting point higher than 150° C. and comprises 50-60% by volume of the PTC material layer. The conductive ceramic filler having a resistivity less than 500μΩ·cm is dispersed in the polymer matrix and comprises 40-45% by volume of the PTC material layer. The carbon-containing conductive filler is dispersed in the polymer matrix and comprises 0.5-5% by volume of the PTC material layer. At 25° C., a ratio of a hold current to an area of the over-current protection device is 0.21-0.3 A/mm, and a ratio of an endurable power to the area of the over-current protection device is 4.8-7.2 W/mm.