US 2022/0115860 A1 · PROTECTIVE ELEMENT AND A FABRICATION METHOD THEREOF

Abstract

A protective element has a body, an inner connection layer, an outer connection layer, a heating layer and a low-melting-point alloy layer. The body is made of a single insulation material. The inner and outer connection layers are formed on two upper and lower surfaces of the body. The low-melting-point alloy layer is formed on the upper surface of the body and is electrically connected to the inner connection layer. The heating layer is mounted inside the body and is electrically connected to the low-melting-point alloy layer by the inner connection layer. The outer connection layer is electrically connected to the low-melting-point alloy layer and the heating layer. The outer connection layer is soldered on a power circuit. When the power circuit encounters overcurrent, the heating layer is heated to fuse the low-melting-point alloy layer faster. Thus, power circuit is cut to protect the power circuit.

Claims20

Dependent claims

A protective element comprising:

a body made of a single insulation material and having a first surface and a second surface;
an inner connection layer formed on the first surface of the body;
a low-melting-point alloy layer mounted on the first surface of the body and electrically connected to the inner connection layer;
a heating layer mounted inside the body and electrically connected to the low-melting-point alloy layer;
and
an outer connection layer formed on the second surface of the body and electrically connected to the low-melting-point alloy layer and the heating layer.

3 more elements

A fabrication method of a protective element comprising steps of:

(a) providing a first substrate and a second substrate, wherein
the first substrate has a first surface and a plurality of first device areas defined on the first surface;
the second substrate has a third surface and a plurality of second device areas defined on the third surface;
and
the first device areas respectively correspond to the second device areas;
(b) forming multiple outer connection layers respectively on each of the first device areas, forming multiple inner connection layers respectively on each of the second device areas, forming a plurality of heating layers between the first substrate and the second substrate, wherein each of the outer connection layer is formed on one of the first device areas, each of the inner connection layers is formed on one of the second device areas, each of the heating layers corresponds to one of the first device areas and corresponds to one of the second device areas;
(c) stacking the second substrate on the first substrate with a fourth surface of the second substrate facing to the a second surface of the first substrate;
(d) sintering the first substrate and the second substrate to a body with a single insulation material, wherein the heating layers are mounted inside the body and are encapsulated by the body;
(e) stacking a plurality of low-melting-point alloy layers on the inner connection layers, wherein each of the low-melting-point alloy layers is electrically connected to one of the heating layers and one of the outer connection layers by the inner connection layer;
and
(f) cutting the body along adjacent edges of the second device areas to form a plurality of protective elements.

8 more elements

Dependencies are inferred from the claim text.

Protective element and a fabrication method thereof

Life of this patent

Protective element and a fabrication method thereof

Life of this patent

Abstract

Claims20