Metal strip chip resistors are the first choice in many circuit design applied surface mount resistors. Because of its particularity, alloy chip resistance can be widely used in many products, especially in the circuit design of electronic products. It is often used to detect voltage or current size. Resistance manufacturers usually use rectangular metal composite strips to make alloy chip resistors, which are safe and convenient for production and transportation.
In the current sampling scheme, the current value can be fed back by measuring the change of magnetic flux in the conductor, especially the appearance of low resistance, which provides a more reliable and convenient design scheme for current sampling. The principle is to convert the current signal that is difficult to detect into a voltage signal that is easy to detect, so as to feedback the magnitude of the current value, to protect the circuit safety, to feedback the circuit signal. The advantages of high precision and low temperature coefficient make it the first choice of current sampling design.
Below are the procedures for making alloy chip resistors from rectangular metal composite strip.
Firstly, two metal strips are bonded together through insulation glue to form a rectangular metal composite strip, and the two metal material bands are separated by insulation glue. One metal strip is used as resistance layer, the other metal strip can be used as heat dissipation layer with high thermal conductivity.
Secondly, coating insulating adhesive layer with rectangular metal composite strip.
Thirdly, the laser burns some insulating layers at both ends of the resistive alloy tape, and the width of the insulating rubber layer is equal to the width of the electrode.
Fourthly, part of electroplated metal that burns off the insulating rubber layer is a cathode.
Fifthly, a specific resistance path is prepared by adopting a method of laser burning, etching or chemical corrosion on a resistance composite material belt to accurately adjust the resistance.
Sixth, punching and cutting into single-piece alloy chip resistor
Firstly, two metal strips are bonded together through insulation glue to form a rectangular metal composite strip, and the two metal material bands are separated by insulation glue. One metal strip is used as resistance layer, the other metal strip can be used as heat dissipation layer with high thermal conductivity.
Secondly, coating insulating adhesive layer with rectangular metal composite strip.
Thirdly, the laser burns some insulating layers at both ends of the resistive alloy tape, and the width of the insulating rubber layer is equal to the width of the electrode.
Fourthly, part of electroplated metal that burns off the insulating rubber layer is a cathode.
Fifthly, a specific resistance path is prepared by adopting a method of laser burning, etching or chemical corrosion on a resistance composite material belt to accurately adjust the resistance.
Sixth, punching and cutting into single-piece alloy chip resistor
The existing process of alloy patch resistance mostly adopts the whole alloy material with large area. Firstly, etch and cut on the alloy material form a groove that is depressed to a specified depth, and the slot edge is used as a long edge of the resistance. Then another short edge of resistance is formed by the same method.
The difficulty of this process is that the size accuracy of the product after etching is not high, which is not conducive to the stable distribution of resistive value before adjusting resistance of product, and it is difficult to ensure the resistance accuracy of product after resistor adjustment. On the other hand, the grinding wheel cutting machine is used to cut a single chip resistance body on a single alloy patch, and the grinding wheel loss of the grinding wheel cutting machine is large, and the manufacturing cost of the product is increased.
The difficulty of this process is that the size accuracy of the product after etching is not high, which is not conducive to the stable distribution of resistive value before adjusting resistance of product, and it is difficult to ensure the resistance accuracy of product after resistor adjustment. On the other hand, the grinding wheel cutting machine is used to cut a single chip resistance body on a single alloy patch, and the grinding wheel loss of the grinding wheel cutting machine is large, and the manufacturing cost of the product is increased.
