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CN-122000154-A - Flame-retardant piezoresistor assembly

CN122000154ACN 122000154 ACN122000154 ACN 122000154ACN-122000154-A

Abstract

The invention discloses a flame-retardant piezoresistor assembly, which comprises a base, a fixed conducting plate, an elastic conducting plate and a piezoresistor chip, wherein a first piezoresistor conducting electrode and a second piezoresistor conducting electrode are respectively arranged at two ends of the piezoresistor chip, the lower end of the fixed conducting plate is fixed on the base, the upper end of the fixed conducting plate is connected with the first piezoresistor conducting electrode, the lower end of the elastic conducting plate is fixed on the base, the elastic conducting plate has outward elasticity so that the upper end of the elastic conducting plate is not connected with the second piezoresistor conducting electrode in the natural state that the lower end of the elastic conducting plate is fixed on the base, the upper end of the elastic conducting plate is connected with the second piezoresistor conducting electrode through metal welding, when the thermal runaway of the piezoresistor chip is realized, the welding metal is melted, the elastic conducting plate is outwards rebounded and separated from the second piezoresistor conducting electrode, and thus the electric connection between the two is disconnected, the piezoresistor chip stops heating in the power-off state, and the ignition of potting glue is avoided.

Inventors

  • LIU FUGUANG

Assignees

  • 中山市夜牛照明科技有限公司

Dates

Publication Date
20260508
Application Date
20260204

Claims (10)

  1. 1. The flame-retardant varistor assembly is characterized by comprising a base (1), a fixed conducting strip (2), an elastic conducting strip (3) and a varistor chip (4), wherein a first varistor conducting electrode (41) and a second varistor conducting electrode (42) are respectively arranged on the end surfaces of two ends of the varistor chip (4), the lower end of the fixed conducting strip (2) is fixed on the base (1), the upper end of the fixed conducting strip (2) is connected with the first varistor conducting electrode (41), the lower end of the elastic conducting strip (3) is fixed on the base (1), the elastic conducting strip (3) has outward elasticity so that the upper end of the elastic conducting strip (3) is not connected with the second varistor conducting electrode (42) in the natural state that the lower end of the elastic conducting strip (3) is fixed on the base (1), and the upper end of the elastic conducting strip (3) is connected with the second varistor conducting electrode (42) through metal welding.
  2. 2. The flame-retardant varistor assembly of claim 1, further comprising an output conductive sheet (5), wherein the lower end of the output conductive sheet (5) is fixed to the base (1), the upper end of the output conductive sheet (5) is connected to the second varistor conductive electrode (42), and the output conductive sheet (5) is not connected to the elastic conductive sheet (3).
  3. 3. A flame retardant varistor assembly according to claim 1, wherein the lower end of the fixed conductive sheet (2) extends through the base (1) and the lower end of the elastic conductive sheet (3) extends through the base (1).
  4. 4. A flame retardant varistor assembly according to claim 2, characterized in that the lower end of the output conducting strip (5) extends through the base (1).
  5. 5. A flame retardant varistor assembly as in claim 2, wherein the fixed conductive sheet (2) is disposed on the base (1) opposite the elastic conductive sheet (3), and wherein the elastic conductive sheet (3) is disposed on the base (1) on the same side as the output conductive sheet (5).
  6. 6. A flame retardant varistor assembly according to claim 2 or 5, characterized in that the width of the elastic conductive sheet (3) is greater than the width of the output conductive sheet (5).
  7. 7. A flame retardant varistor assembly as in claim 1, wherein the upper end of the fixed conductive sheet (2) is connected to the first varistor conductive electrode (41) by solder and the upper end of the flexible conductive sheet (3) is connected to the second varistor conductive electrode (42) by solder.
  8. 8. A flame retardant varistor assembly as claimed in claim 2, wherein the upper end of the output conductive sheet (5) is connected to the second varistor conductive electrode (42) by solder.
  9. 9. A flame-retardant varistor assembly as claimed in claim 1 or 2, characterized in that the varistor chip (4) is provided with a jacket (6) which is connected to the base (1) and closes the varistor chip (4).
  10. 10. A flame-retardant varistor assembly as in claim 1, wherein the varistor die (4) is a cylindrical varistor and the first varistor conductive electrode (41) and the second varistor conductive electrode (42) are disposed on the circular end surfaces on either side of the cylindrical varistor.

Description

Flame-retardant piezoresistor assembly Technical Field The invention relates to a flame-retardant piezoresistor assembly. Background In the existing glue filling type LED driving power supply, polyurethane, epoxy resin and silica gel are generally adopted for pouring sealant treatment. Meanwhile, in the traditional LED driving power supply of the glue pouring type, lightning protection components such as a piezoresistor are generally arranged, but the piezoresistor is out of control when lightning surge exceeds a rated value or mains voltage exceeds the rated value, and the risk of fire is caused by igniting the potting glue. Disclosure of Invention The invention overcomes the defects of the prior art and provides a flame-retardant piezoresistor assembly. In order to achieve the above purpose, the present invention adopts the following technical scheme: The flame-retardant piezoresistor assembly is characterized by comprising a base, a fixed conducting plate, an elastic conducting plate and a piezoresistor chip, wherein the end faces of two ends of the piezoresistor chip are respectively provided with a first piezoresistor conducting electrode and a second piezoresistor conducting electrode, the lower end of the fixed conducting plate is fixed on the base, the upper end of the fixed conducting plate is connected with the first piezoresistor conducting electrode, the lower end of the elastic conducting plate is fixed on the base, the elastic conducting plate has outward elasticity, so that the upper end of the elastic conducting plate is not connected with the second piezoresistor conducting electrode in the natural state that the lower end of the elastic conducting plate is fixed on the base, and the upper end of the elastic conducting plate is connected with the second piezoresistor conducting electrode through metal welding. The flame-retardant piezoresistor assembly is characterized by further comprising an output conducting plate, wherein the lower end of the output conducting plate is fixed on the base, the upper end of the output conducting plate is connected with the second piezoresistor conducting electrode, and the output conducting plate is not connected with the elastic conducting plate. The flame-retardant varistor assembly is characterized in that the lower end of the fixed conducting strip extends out through the base, and the lower end of the elastic conducting strip extends out through the base. The flame-retardant varistor assembly is characterized in that the lower end of the output conducting strip penetrates through the base to extend out. The flame-retardant piezoresistor assembly is characterized in that the fixed conducting plate and the elastic conducting plate are oppositely arranged on the base, and the elastic conducting plate and the output conducting plate are arranged on the same side of the base. The flame-retardant varistor assembly is characterized in that the width of the elastic conducting strip is larger than that of the output conducting strip. The flame-retardant varistor assembly is characterized in that the upper end of the fixed conducting plate is connected with the conducting electrode of the first varistor through soldering tin, and the upper end of the elastic conducting plate is connected with the conducting electrode of the second varistor through soldering tin. The flame-retardant piezoresistor assembly is characterized in that the upper end of the output conducting plate is connected with the conducting electrode of the second piezoresistor through soldering tin. The flame-retardant varistor assembly is characterized in that the varistor chip is sleeved with an outer sleeve connected with the base to seal the varistor chip. The flame-retardant varistor assembly is characterized in that the varistor chip is a cylindrical varistor, and the first varistor conductive electrode and the second varistor conductive electrode are respectively arranged on the circular end surfaces on two sides of the cylindrical varistor. The beneficial effects of the invention are as follows: According to the invention, the fixed conducting strip and the elastic conducting strip are fixedly connected on the base, so that the upper end of the fixed conducting strip is connected with the first piezoresistor conducting electrode, the upper end of the elastic conducting strip is connected with the second piezoresistor conducting electrode through metal welding, meanwhile, the upper end of the elastic conducting strip has elastic force for bouncing outwards, the elastic conducting strip has elastic force outwards, so that the upper end of the elastic conducting strip is not connected with the second piezoresistor conducting electrode in a natural state that the lower end of the elastic conducting strip is fixed on the base, and the purpose that the welding metal is melted when a lightning surge exceeds a rated value or a mains voltage exceeds the rated value is generated in thermal runaway