| 摘要 |
The present invention discloses a device comprising a thermal fuse, a resistor and a protective casing. The protective casing provides housing for the thermal fuse and the resistor and increases the anti-explosion properties and insulating and voltage-withstanding properties at the same time. The thermal fuse and the resistor can be used as a basic unit and be directly installed into a switch-mode power supply. It is capable of replacing the existing simple wirewound resistor or the wirewound resistor with an external contact type thermal fuse, and realizing the functions of general impedance, over-current fuse protection, surge protection, anti-explosion and over-temperature protection in case of overloading. |
| 主权项 |
1. A device comprising:
a thermal fuse; a resistor; wherein the thermal fuse further comprises a first lead wire, a second lead wire, a low melting point metal wire welded between the first lead wire and the second lead wire and a fluxing promoting agent; a hollow ceramic tube providing housing for the low melting point metal wire and the fluxing promoting agent; an insulating material sealed at two ends of the hollow ceramic tube, wherein the first lead wire and the second lead wire respectively pass through the insulating material at two ends of the hollow ceramic tube; wherein the resistor further comprises a resistor body, said hollow ceramic tube, a first metal cap and a second metal cap to lock the two ends of the hollow ceramic tube to form a tight integration and electrically connect with two ends of the resistor body and an insulating coating located on the outer surface of the hollow ceramic tube; wherein the first lead wire and the second lead wire respectively pass through the first metal cap and the second metal cap; and wherein the thermal fuse, the resistor body, the first metal cap and the second metal cap are encapsulated in the insulating coating, and the insulating coating is selected from a group consisting of epoxy resin, silicone, silicone rubber or inorganic material. |
