High-safety lamp tube and method for increasing protection range of thermal fuse

Patent metadata

Field	Value
Publication number	US-11942294-B2
Application number	US-202217571520-A
Country	US
Kind code	B2
Filing date	Jan 9, 2022
Priority date	Nov 29, 2021
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A method for increasing the protection range of a thermal fuse, which includes the following steps: disposing the thermal fuse on a circuit board including a circuit loop, a first heat generating element and a second heat generating element; the second heat generating element is electrically connected to the circuit loop; electrically connecting the first heat generating element to the circuit loop; and disposing the heat conducting material on the circuit loop and making the heat conducting material cover the thermal fuse, the first heat generating element and the second heat generating element.

First claim

What is claimed is:

1. A high-safety lamp tube, comprising:
a main body, and;
a circuit board, disposed in the main body, and comprising a circuit loop, a first heat generating element, a second heat generating element, wherein the second heat generating element is electrically connected to the circuit loop;
a thermal fuse, wherein the first heat generating element is electrically connected to the circuit loop via the thermal fuse, and the thermal fuse is adhered to the first heat generating element via an adhesive layer; and
a heat conducting material, disposed on the circuit board, wherein the heat conducting material covers the thermal fuse, the first heat generating element and the second heat generating element.

2. The high-safety lamp tube as claimed in claim 1 , wherein the heat conducting material is a thermal grease.

3. The high-safety lamp tube as claimed in claim 1 , wherein the first heat generating element and the second heat generating element are varistors, coils, transformers, cooper pins or control chips.

4. The high-safety lamp tube as claimed in claim 1 , wherein the circuit board is a driving power source circuit board.

5. A method for increasing a protection range of a thermal fuse, comprising:
disposing the thermal fuse on a circuit board comprising a circuit loop, a first heat generating element and a second heat generating element, wherein the second heat generating element is electrically connected to the circuit loop;
electrically connecting the first heat generating element to the circuit loop via the thermal fuse, wherein the thermal fuse is attached to the first heat generating element via an adhesive layer; and
disposing a heat conducting material on the circuit board, and making the heat conducting material cover the thermal fuse, the first heat generating element and the second heat generating element.

6. The method for increasing the protection range of the thermal fuse as claimed in claim 5 , further comprising:
pressing the heat conducting material to make a thickness of the heat conducting material to be uniform.

7. The method for increasing the protection range of the thermal fuse as claimed in claim 5 , further comprising:
adhering the thermal fuse to the first heat generating element via an adhesive layer.

8. The method for increasing the protection range of the thermal fuse as claimed in claim 5 , wherein the first heat generating element and the second heat generating element are varistors, coils, transformers, cooper pins or control chips.

Assignees

• Xiamen Pvtech Co Ltd

Inventors

• Lu Fuxing
• Liu Rongtu

Classifications

• H01H37/761 Primary

  with a fusible element forming part of the switched circuit (H01H37/767 takes precedence) · CPC title

• H05K1/0201 Primary

  Thermal arrangements, e.g. for cooling, heating or preventing overheating · CPC title

• H05K2201/10181

  Fuse · CPC title

• F21V25/10 Primary

  coming into action when lighting device is overloaded, e.g. thermal switch · CPC title

• F21Y2103/00

  Elongate light sources, e.g. fluorescent tubes · CPC title