Over-current protection device
AssigneePolytronics Technology Corp.
InventorsChia-Yuan Lee, Cheng-Yu Tung, Hsiu-Che Yen, Chen-Nan Liu, Yung-Hsien Chang, Yao-Te Chang, Fu-Hua Chu
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Abstract
An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as α-PVDF, β-PVDF and γ-PVDF. The total amount of α-PVDF, β-PVDF and γ-PVDF is calculated as 100%, and the amount of γ-PVDF accounts for 33% to 42%.
Claims14
An over-current protection device, comprising:
- a first metal layer;
- a second metal layer;
- and
- a heat-sensitive layer laminated between the first metal layer and the second metal layer, the heat-sensitive layer exhibiting a positive temperature coefficient (PTC) characteristic and comprising:
- a first polymer consisting of polyvinylidene difluoride (PVDF), wherein PVDF has a plurality of crystalline phases comprising α-PVDF, β-PVDF and γ-PVDF, wherein the total amount of α-PVDF, β-PVDF and γ-PVDF is calculated as 100%, and the amount of γ-PVDF accounts for 33% to 42%;
- and
- a conductive filler consisting of carbon black and dispersed in the first polymer, thereby forming an electrically conductive path in the heat-sensitive layer.
Dependencies are inferred from the claim text.