CN201601487U

CN201601487U - Chip type blocky surge protector

Info

Publication number: CN201601487U
Application number: CN2009202199777U
Authority: CN
Inventors: 张书郎
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2010-10-06
Anticipated expiration: 2019-10-23

Abstract

A chip type blocky surge protector comprises an outer casing and a bottom plate. Leads of the surge protector are pre-bent monolithic leads, crystal particles are welded on projections at the tail ends of the leads, the leads with the crystal particles are arranged inside the outer casing, and the outer casing is attached onto the bottom plate through a press mold. Before welding, serially connected sliced leads are cut into monolithic leads, the monolithic leads are bent and shaped according to required bend allowance so as to obtain the pre-bent monolithic leads, the surge protector is shaped after molded by aid of the pre-bent monolithic leads, and then the leads are not required to be cut and bent after being molded, thereby avoiding damaging the crystal particles due to stress generated during two bending processes. In addition, the chip type blocky surge protector can reduce stress generated during production, prevents the crystal particles from being cracked by the stress, greatly prolongs service life and increases reliability of products, simultaneously reduces production procedures, increases production efficiency and lowers cost.

Description

SMD block Surge Protector

Technical field

The utility model relates to a kind of Surge Protector, and particularly a kind of employing is folding type monolithic lead-in wire in advance, can prevent in process of production that stress causes inside chip impaired, the SMD block Surge Protector that increases reliability of products and increase the service life.

Background technology

At present, vehicle electronics shared ratio in car load is quite big.Though these electronic modules have brought comfortableness and fail safe for user vehicle, meanwhile, the reliability of electronic module is analyzed from automotive environment, has also produced some problems that can not be ignored.

Because electronic module is very responsive to electromagnetic interference (EMI), Electrostatic Discharge and other electrical Interference (automobile itself is the source of these harm), so must consider carefully when in automotive environment, using electronic module.At the common electrical hazard of current automobile, International Standards Organization has put into effect many covers electic protection standard.Automaker and supplier must consider these standards, and only increase the protection components and parts in electronic module, and the reliability of its electrical appliance part just may be protected.

The power of the Surge Protector of known SMD block epoxy encapsulation is low; life-span is shorter; and the structure of block many materials chip; its lead-in wire adopts tablet formula structure before not welding; be cascaded by a plurality of lead-in wires, its production procedure is: welding, pressing mold, T/F (pruning/bending) moulding, baking, plating, baking, T/F (secondary bending), test, QC check, warehouse-in.Concrete steps be arrange at the enterprising line lead of welding mould, scolder filling, crystal grain filling, scolder filling, base plate filling, again mould is combined and puts into soldering furnace and weld; Send pressing mold station pressing mold then; Enter the T/F process after the pressing mold, promptly the pressing mold semi-finished product that are cascaded are gone between and prune and bending, become the SMD block Surge Protector of single moulding; Toast with high temperature again, carry out testing electrical property and check then, at last warehouse-in.Owing to pruning through twice T/F process and bending can make SMD block Surge Protector diode be impacted to produce stress; so that drive the sheet of welding in the lead-in wire art end colloid; cause crystal grain impaired easily, thus cause reliability of products to reduce and useful life not long.

Summary of the invention

The purpose of this utility model is that a kind of employing folding type monolithic lead-in wire in advance will be provided, with reduce produce in process of production make the impaired stress of crystal grain, long product lifecycle, the SMD block Surge Protector that reliability is high.

The purpose of this utility model is achieved in that a kind of SMD block Surge Protector; comprise shell and base plate; the lead-in wire of Surge Protector is the lead-in wire of folding type monolithic in advance; crystal grain is welded on the salient point of lead terminal; the lead-in wire that crystal grain is housed places in the shell, and shell is attached on the base plate by pressing mold.

The SMD block Surge Protector that the utility model provides; before welding, lead-in wire is cut into monomer-type by the tablet formula that is cascaded; and bending degree bending forming as requested; obtain a kind of monolithic of folding type in advance lead-in wire; adopt this monolithic of folding type in advance lead-in wire to make after pressing mold, pasting of Surge Protector just molded; and need not behind pressing mold, lead-in wire to be sheared and bent again; thereby avoided Surge Protector to cause the inner crystal grain impaired because of the stress that twice bending process produces; the stress that can reduce in process of production to be produced; prevent the crystal grain stress and embrittlement; the life-span and the reliability of product are improved greatly; reduce production process simultaneously; enhance productivity, and reduce cost.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is a monolithic pin configuration schematic diagram of the present utility model.

Fig. 2 is the lead-in wire schematic diagram behind the utility model bending forming.

Fig. 3, Fig. 4 are the SMD block Surge Protector schematic diagrames of finished product.

Among the figure, 1, groove, 2, the lead-in wire bulk portion, 3, lead-in wire, 4, salient point, 5, shell, 6, base plate.

Embodiment

A kind of SMD block Surge Protector; comprise shell 5 and base plate 6, the lead-in wire 3 of Surge Protector is welded on the salient point 4 of lead-in wire 3 ends for the lead-in wire of folding type monolithic in advance, crystal grain; the lead-in wire that crystal grain is housed places in the shell 5, and shell 5 is attached on the base plate by pressing mold.

Be that the tablet formula lead-in wire that former cause is cascaded is trimmed to monomer-type in Fig. 1, so just avoided behind pressing mold, lead-in wire being pruned, thereby minimizing prevent from that to the stressed effect of SMD block Surge Protector crystal grain is impaired again.

It in Fig. 2 the pin configuration behind the bending forming; the lead-in wire of SMD block Surge Protector is bent with regard to as requested bending degree before welding; this way is because bending forming in advance; thereby avoid behind pressing mold, SMD block Surge Protector being produced the lead-in wire bending that impulsive force is arranged; so not only protect crystal grain, also shortened production procedure.

Fig. 3 is SMD block Surge Protector diode finished figure shown in 4.With the lead-in wire 3 that improves structure among Fig. 2 with salient point 4 put into the groove of welded disc towards upper groove 1 mode down; on salient point 4, put scolder, crystal grain, weldering scolder and base successively; by welding crystal grain is welded on the salient point 4 of lead-in wire 3 ends; and colloid shell 5 being attached on the base plate 6 by pressing mold, 5 pairs of crystal grain of colloid shell and base plate 6 play fixing and protective effect.After the SMD block Surge Protector moulded section, make colloid firm through overbaking again, SMD block Surge Protector diode finished product is produced in follow-up test, check.Wherein go between 3 the pin and the bulk portion 2 of lead-in wire is respectively two pads.

Claims

1. SMD block Surge Protector; comprise shell (5) and base plate (6); it is characterized in that: the lead-in wire of Surge Protector (3) is the lead-in wire of folding type monolithic in advance; crystal grain is welded on the terminal salient point (4) of lead-in wire (3); the lead-in wire that crystal grain is housed places in the shell (5), and shell (5) is attached on the base plate by pressing mold.