Central conductor structure for improving welding reliability of lumped parameter device

Abstract

The utility model discloses a central conductor structure for improving the welding reliability of a lumped parameter device, which belongs to the technical field of microwave devices and comprises three woven belts and central conductor bonding pads at the tail ends of the woven belts, and each central conductor bonding pad is of two independent bonding pad structures. The two independent bonding pad structures are connected through a connecting band, and a bonding pad opening is formed in the side part of each independent bonding pad structure; the central conductor of the utility model can effectively solve the problem of abnormal open welding, and realizes better welding effect and welding reliability; the area of a single bonding pad is reduced, the flatness of the bonding pad can be controlled more easily, and the welding quality of welding spots is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave devices, in particular to a central conductor structure for improving the welding reliability of lumped parameter devices. Background Art

[0002] Lumped parameter isolators are mainly used between pre-amplifiers to provide unidirectional conduction, reverse isolation, and inter-stage matching. The plastic package is one of the representative solutions for the current lumped parameter device design, with advantages such as temperature stability and low deformation. The device is composed of multiple stacked components, which are connected by solder paste. The welding quality of the solder joints directly determines the overall reliability of the device.

[0003] The existing central conductor module structure is as follows Figure 1 As shown, it is composed of three insulating films 1, a central conductor 2, and a ferrite gyromagnetic substrate 3. The central conductor module, capacitor 4, load 5 and plastic package 6 are combined together in a stacked structure, and the connection is connected by solder paste. Figure 2 As shown, the center conductor structure is as follows Figure 3 As shown, the ferrite gyromagnetic substrate 3 is placed at the center of the center conductor 2, and then the three center conductor braids 2a, 2b, and 2c that are 120 degrees to each other are bent and braided in sequence to wrap the ferrite gyromagnetic substrate 3. A circular insulating film 1 is placed on the upper surface of the three center conductor braids 2a, 2b, and 2c to play an isolation role; then the braided center conductor is formed using a final forming tool to form three pads 2d, 2e, and 2f;

[0004] like Figure 1 As shown, the three pads of the existing central conductor 2 are connected to the capacitor 4, the resistor 5 and the plastic package housing pin pad 6a. Among them, the central conductor pads 2f and 2d are simultaneously welded to the capacitor 4 and the plastic package housing pin pad 6a, and the central conductor pad 2e is simultaneously welded to the capacitor 4 and the load 5. This leads to the following two problems:

[0005] (1) There are two welding points on the central conductor pad at the same time, forming a structure where two welding points share the pad, and the sizes of the two welding points are inconsistent; when the pad is pulled by external force, the adhesion of the large welding point is greater than that of the small welding point, which will increase the risk of failure of the small welding point;

[0006] (2) The existing central conductor pad is relatively long, and the flatness of the pads 2d, 2e, and 2f is difficult to control. If the flatness cannot be guaranteed, one of the two solder joints may have a debonding problem.

[0007] That is, the existing center conductor module pads and plastic package shell pin pads are prone to open welding due to the stress of the center conductor material, structural distribution and other reasons, and the reliability needs to be improved. Summary of the invention

[0008] The purpose of the utility model is to provide a central conductor structure for improving the welding reliability of a lumped parameter device, so as to solve the above-mentioned problem.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a central conductor structure for improving the welding reliability of a lumped parameter device, comprising three braided belts and a central conductor pad at the end of the braided belts, each of the central conductor pads being two independent pad structures, the two independent pad structures being connected by a connecting belt, and a pad opening being arranged on the side of each of the independent pad structures.

[0010] As a preferred technical solution: the two independent pad structures are arranged in a "J" shape.

[0011] As a preferred technical solution: the pad opening is in the shape of a special-shaped notch with an opening narrower than the inside and an arc-shaped inside, that is, similar to a gourd shape.

[0012] As a preferred technical solution: the connecting belt is located on the braided belt.

[0013] In the present invention, the original integral pad is set as two independent pad structures, and the connection part (connection belt) between the independent pads is moved up to the central conductor braided belt. The advantage is that the two independent pad structures avoid the risk of the small pad being pulled by the large pad due to the inconsistency of the pad size, and the stresses borne by the two pads will not be transmitted and affected to each other.

[0014] In addition, the two independent pads are easier to achieve pad flatness. Since the area of ​​the two independent pads is smaller than the existing center conductor structure, it is easier to achieve a higher flatness in the final molding stage; in addition, since the connection part is moved up, the two independent center conductor braids below the connection part are easier to bend and form.

[0015] A pad opening with an opening narrower than the inside and an arc-shaped irregular notch is made on both sides of the pad. The pad opening can allow the solder at the bottom of the pad to overflow to the upper surface of the pad, achieving a better welding effect.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) The central conductor structure of the utility model avoids the adverse effects caused by the two solder joints sharing the same pad. The two solder joints are independent of each other and are not affected, which can effectively solve the problem of abnormal open welding.

[0018] (2) The central conductor structure of the utility model reduces the area of ​​a single pad, making it easier to control the flatness of the pad;

[0019] (3) The opening of the pad is narrower than the inside and the inside is an arc-shaped irregular notch, which can make the solder at the bottom of the pad overflow to the upper surface of the pad, improve the welding quality of the solder joint and achieve better welding effect;

[0020] (4) The central conductor structure of the utility model mainly changes the pad structure, and the width and length of the three braided belts do not change. The existing tooling equipment can realize the braiding forming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of mounting the mid-guide module in the prior art;

[0022] Figure 2 for Figure 1 Schematic diagram of the center conductor in;

[0023] Figure 3 for Figure 1 The central conductor structure diagram in the figure;

[0024] Figure 4 This is a structural diagram of a central conductor of an embodiment of the utility model;

[0025] Figure 5 A structural diagram is prepared for a central conductor using an embodiment of the utility model;

[0026] In the figure: 1. Insulating film; 2. Central conductor; 3. Ferrite gyromagnetic substrate; 4. Capacitor; 5. Load; 6. Plastic casing. DETAILED DESCRIPTION

[0027] The utility model will be further described below in conjunction with the accompanying drawings.

[0028] Embodiment 1:

[0029] See also Figure 4 and Figure 5 , a central conductor structure for improving the welding reliability of a lumped parameter device, comprising three braided belts and central conductor pads at the ends of the braided belts, each of the central conductor pads being two independent pad structures 7a, 7b, the two independent pad structures 7a, 7b being connected by a connecting belt 7d, the connecting belt 7d being located on the braided belt, and a pad opening 7c being provided at the side of each of the independent pad structures;

[0030] In this embodiment, the two independent pad structures 7a and 7b are arranged in a "J" shape;

[0031] The pad opening is in the shape of a special-shaped notch with an opening narrower than the inside and an arc-shaped inside;

[0032] Compared with the prior art, the central conductor structure of this embodiment mainly improves the pad structure, and the width and length of the three braided belts remain unchanged.

[0033] like Figure 5 As shown, after the improvement, the pad area is reduced, making it easier to achieve bending forming.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A central conductor structure for improving the welding reliability of a lumped parameter device, comprising three braided strips and a central conductor pad at the end of the braided strips, characterized in that: Each of the central conductor pads is composed of two independent pad structures, which are connected by a connecting strip, and a pad opening is arranged on the side of each of the independent pad structures.

2. A central conductor structure for improving the welding reliability of a lumped parameter device according to claim 1, characterized in that: The two independent pad structures are arranged in a "J" shape.

3. A central conductor structure for improving the welding reliability of a lumped parameter device according to claim 1, characterized in that: The pad opening is in the shape of a special-shaped notch with an opening narrower than the inside and an arc-shaped inside.

4. The central conductor structure for improving the welding reliability of a lumped parameter device according to claim 1, characterized in that: The connecting belt is located on the braided belt.

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