Piezoresistor with double temperature insurance for communication base station and preparation method of piezoresistor

Abstract

The invention belongs to the technical field of electronic component manufacturing. The technical scheme is that a piezoresistor with double temperature insurance for a communication base station comprises a piezoresistor body, a flame-retardant shell, a positioning clamp and a flame-retardant filling material. The piezoresistor body comprises a zinc oxide-based piezoresistor valve plate, a tinnedcopper sheet, a temperature fuse, a bypass fuse and a lead. The flame-retardant filling material comprises an epoxy resin potting material and a flame-retardant epoxy resin packaging material. The piezoresistor body is arranged in the flame-retardant shell, the positioning clamp is arranged and is filled with the epoxy resin potting material and the flame-retardant epoxy resin packaging material,the tinned copper sheet is fixed on a silver electrode of the zinc oxide-based piezoresistor valve plate through the tin foil and is connected with the temperature fuse in series, and the bypass fuseis fixed by AB glue. The piezoresistor has the advantages that the temperature fuse is connected outside the piezoresistor chip in series, when abnormal large current enters along the power supply ofthe base station, the temperature fuse is fused, no voltage drop exists at two ends of the piezoresistor, and the power supply is cut off, so that the use safety is ensured.

Description

technical field

[0001] The invention belongs to the technical field of electronic component manufacturing technology, and in particular relates to a piezoresistor with dual temperature insurance for communication base stations and a preparation method thereof. Background technique

[0002] The power supply of the communication base station is 48V DC, which is often located outdoors. It is subjected to more induced lightning strikes and operating overvoltages, and the communication base station components are highly integrated and have a lower withstand voltage, so they need low residual voltage and large flow voltage. The sensitive resistor acts as overvoltage protection. Looking at the E24 series of zinc oxide varistors, the maximum continuous DC voltage of varistor voltage 68V is 56V, which can also meet the overvoltage protection of 48V DC power supply, but its typical limit voltage upper limit is 135V (14D, 10A , the flow rate is 1000A); the maximum continuous DC voltag...

Examples

Embodiment Construction

[0025] A kind of preparation method of the varistor with dual temperature insurance communication base station of the present invention comprises the following steps:

[0026] Step 1, prepare a zinc oxide varistor square sheet with a varistor voltage of 82V with a size of 12*12*09, 25*22*0.9: weigh zinc oxide (100Kg), bismuth trioxide (3.5Kg), three Antimony oxide (1.5Kg), tricobalt tetroxide (0.3Kg), chromium oxide (100g), nickel oxide (120g), manganese oxide (500g) and other raw materials, medium pressure material formula, add deionized water ball mill, spray It is made of granulation, tablet pressing, high temperature sintering, wire mesh brush electrode and silver firing. The square molds of 14*14 and 29.5*26 are customized. The four corners are arcs of R=2, and the thickness of the pressed green body is 1.1mm. The typical varistor process burns silver flakes with a varistor voltage of 82+ / -10%;

[0027] Step 2: Test the special solder paste for zinc oxide varistor square...

technical field

[0001] The invention belongs to the technical field of electronic component manufacturing technology, and in particular relates to a piezoresistor with dual temperature insurance for communication base stations and a preparation method thereof. Background technique

[0002] The power supply of the communication base station is 48V DC, which is often located outdoors. It is subjected to more induced lightning strikes and operating overvoltages, and the communication base station components are highly integrated and have a lower withstand voltage, so they need low residual voltage and large flow voltage. The sensitive resistor acts as overvoltage protection. Looking at the E24 series of zinc oxide varistors, the maximum continuous DC voltage of varistor voltage 68V is 56V, which can also meet the overvoltage protection of 48V DC power supply, but its typical limit voltage upper limit is 135V (14D, 10A , the flow rate is 1000A); the maximum continuous DC voltag...

Examples

Embodiment Construction

[0025] A kind of preparation method of the varistor with dual temperature insurance communication base station of the present invention comprises the following steps:

[0026] Step 1, prepare a zinc oxide varistor square sheet with a varistor voltage of 82V with a size of 12*12*09, 25*22*0.9: weigh zinc oxide (100Kg), bismuth trioxide (3.5Kg), three Antimony oxide (1.5Kg), tricobalt tetroxide (0.3Kg), chromium oxide (100g), nickel oxide (120g), manganese oxide (500g) and other raw materials, medium pressure material formula, add deionized water ball mill, spray It is made of granulation, tablet pressing, high temperature sintering, wire mesh brush electrode and silver firing. The square molds of 14*14 and 29.5*26 are customized. The four corners are arcs of R=2, and the thickness of the pressed green body is 1.1mm. The typical varistor process burns silver flakes with a varistor voltage of 82+ / -10%;

[0027] Step 2: Test the special solder paste for zinc oxide varistor square...

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