阅读说明：本技术 一种中小功率混合集成电路的组装方法 (Method for assembling medium and small power hybrid integrated circuit ) 是由 王晓卫 于 2021-08-18 设计创作，主要内容包括：本发明公开一种中小功率混合集成电路的组装方法,该方法包括涂胶步骤、贴片步骤、固化步骤、键合步骤以及入壳步骤,具体为在陶瓷基板上涂布导电胶以及绝缘胶,在完成涂胶的陶瓷基板上粘接若干器件,器件为信号传输件或者为无大电流导通件,将完成器件粘接的陶瓷基板置入固化炉中进行胶体固化；将固化后的陶瓷基板和各器件进行键合互联,采用共晶焊接方式将键合后的陶瓷基板固定于外壳内。本发明针对中小功率厚膜混合集成电路,通过对组装工艺流程进行调整,取消了器件焊接步骤,将器件的两个粘接步骤进行合并,在入壳前进行键合,缩短了生产流程,避免外壳对键合和贴片的干扰,降低了产品设计难度,提高了产品组装密度,有助于该组装方法推广。(The invention discloses a method for assembling a medium and small power hybrid integrated circuit, which comprises a gluing step, a mounting step, a curing step, a bonding step and a casing step, and specifically comprises the steps of coating conductive adhesive and insulating adhesive on a ceramic substrate, bonding a plurality of devices on the ceramic substrate which is glued, wherein the devices are signal transmission pieces or non-heavy-current conduction pieces, and placing the ceramic substrate which is bonded with the devices into a curing furnace for colloid curing; and bonding and interconnecting the cured ceramic substrate and each device, and fixing the bonded ceramic substrate in the shell by adopting an eutectic welding mode. Aiming at the medium-power and low-power thick film hybrid integrated circuit, the invention eliminates the step of welding the device by adjusting the assembly process flow, combines the two bonding steps of the device and bonds the device before entering the shell, shortens the production flow, avoids the interference of the shell on bonding and surface mounting, reduces the design difficulty of the product, improves the assembly density of the product and is beneficial to the popularization of the assembly method.)

1. A method for assembling a medium and small power hybrid integrated circuit, the method comprising:

gluing: coating conductive adhesive and insulating adhesive on the ceramic substrate;

a paster pasting step: bonding a plurality of devices on the ceramic substrate which is coated with the glue, wherein the devices are signal transmission pieces or non-heavy-current conduction pieces;

and (3) curing: placing the ceramic substrate subjected to device bonding into a curing furnace for colloid curing;

bonding: bonding and interconnecting the cured ceramic substrate and each device;

a shell entering step: and fixing the bonded ceramic substrate in the shell by adopting an eutectic welding mode.

2. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 1, wherein: the method also comprises a printing step before the gluing step:

and printing a circuit to be coated with the conductive adhesive on the ceramic substrate.

3. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 2, wherein: the gluing step comprises the following steps:

fixing a jig plate: placing a jig plate on a ceramic substrate printed with a circuit, wherein the jig plate is provided with a coating groove matched with the printed circuit on the ceramic substrate, and correcting the positions of the coating groove and the printed circuit to enable the coating groove to be arranged corresponding to the printed circuit;

coating conductive adhesive: filling the conductive adhesive in the coating groove, and scraping the conductive adhesive on the jig plate by using a scraper;

coating insulating glue: and taking down the jig plate, and coating the insulating glue on the ceramic substrate.

4. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 2, wherein: in the gluing step, conducting adhesive coating is carried out on the printed ceramic substrate in a conducting adhesive silk-screen printing mode, and then adhesive dispensing coating is carried out on the insulating adhesive.

5. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 1, wherein: in the curing step, the temperature of the curing oven is 150 ℃, and the curing time of the colloid is 1 h.

6. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 1, wherein: in the step of entering the shell, the shell is required to be subjected to tin pre-coating process treatment, and the pre-treated soldering lug and the ceramic substrate are placed into the shell together for eutectic welding.

7. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 1, wherein: the conductive adhesive is a mixture of silver powder and a first high polymer.

8. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 7, wherein: the insulating glue is a second high polymer, and the first high polymer and the second high polymer are both epoxy resin.

9. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 1, wherein: the step of installing a transformer is also included after the step of entering the shell:

and adhering the transformer on the ceramic substrate and curing.

10. The method for assembling a medium and small power hybrid integrated circuit as claimed in claim 9, wherein: the step of installing the transformer further comprises the following testing step:

and debugging and detecting the performance of the assembled product.

Technical Field

The invention relates to the technical field of circuit board assembly, in particular to an assembly method of a medium and small power hybrid integrated circuit.

Background

The device assembly on the thick film hybrid integrated circuit product generally selects two combined processes of bonding and welding, the bonding and welding are both spot coating, the welding process has the advantages of good heat conduction and capability of conducting large current, and relatively, the bonding process has the advantages that glue does not have fluidity, and the states of the device and the glue are controllable.

However, the conventional thick film integrated circuit product assembly usually adopts the process flow of resistor-capacitor part bonding-resistor-capacitor part welding-shell-chip bonding-bonding, adopts a twice bonding method, does not make different technical schemes according to different electrical requirements, and has the disadvantages of repeated steps, complex operation, long process flow time, low production efficiency and waste of cost.

Disclosure of Invention

The invention aims to provide an assembly method of a medium and small power hybrid integrated circuit, which aims to solve the technical problems that the conventional thick film integrated circuit product assembly does not make different technical schemes aiming at different electrical requirements, the steps are repeated, the operation is complex, the process flow time is long, the production efficiency is low and the cost is wasted.

The invention provides an assembly method of a medium-low power hybrid integrated circuit, which comprises the following steps:

gluing: coating conductive adhesive and insulating adhesive on the ceramic substrate;

a paster pasting step: bonding a plurality of devices on the ceramic substrate which is coated with the glue, wherein the devices are signal transmission pieces or non-heavy-current conduction pieces;

and (3) curing: placing the ceramic substrate subjected to device bonding into a curing furnace for colloid curing;

bonding: bonding and interconnecting the cured ceramic substrate and each device;

a shell entering step: and fixing the bonded ceramic substrate in the shell by adopting an eutectic welding mode.

Further, before the gluing step, the method also comprises a printing step:

and printing a circuit to be coated with the conductive adhesive on the ceramic substrate.

Further, the gluing step comprises:

fixing a jig plate: placing a jig plate on a ceramic substrate printed with a circuit, wherein the jig plate is provided with a coating groove matched with the printed circuit on the ceramic substrate, and correcting the positions of the coating groove and the printed circuit to enable the coating groove to be arranged corresponding to the printed circuit;

coating conductive adhesive: filling the conductive adhesive in the coating groove, and scraping the conductive adhesive on the jig plate by using a scraper;

coating insulating glue: and taking down the jig plate, and coating the insulating glue on the ceramic substrate.

Further, in the gluing step, conducting glue coating is carried out on the printed ceramic substrate in a conducting glue silk-screen printing mode, and then glue dispensing coating is carried out on the insulating glue.

Further, in the curing step, the temperature of the curing oven is 150 ℃, and the curing time of the colloid is 1 h.

Further, in the step of entering the shell, the shell needs to be subjected to a pre-tinning process treatment, and the pre-treated soldering lug and the ceramic substrate are placed into the shell together for eutectic soldering.

Further, the conductive adhesive is a mixture of silver powder and a first high polymer.

Further, the insulating glue is a second high polymer, and the first high polymer and the second high polymer are both epoxy resin.

Further, the step of installing a transformer is also included after the step of housing:

and adhering the transformer on the ceramic substrate and curing.

Further, the step of installing the transformer further comprises a testing step after the step of installing the transformer:

and debugging and detecting the performance of the assembled product.

Compared with the prior art, the invention has the beneficial effects that:

aiming at the medium-power and low-power thick film hybrid integrated circuit, the invention eliminates the step of welding the device by adjusting the assembly process flow, combines the two bonding steps of the device and bonds the device before entering the shell, shortens the production flow, avoids the interference of the shell on bonding and surface mounting, reduces the design difficulty of the product, improves the assembly density of the product and is beneficial to the popularization of the application of the assembly method.

Drawings

Fig. 1 is a flowchart of an assembly method of a medium-low power hybrid integrated circuit according to an embodiment of the present invention;

FIG. 2 is an operational view of a glue application step provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a ceramic substrate after being coated with glue according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a ceramic substrate after being mounted on a chip according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a bonded ceramic substrate according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a ceramic substrate according to an embodiment of the present invention after being housed.

In the figure:

10. a ceramic substrate; 20. a conductive adhesive; 30. insulating glue; 40. a device; 41. a capacitor; 42. an IC chip; 50. a housing; 60. a jig plate; 61. a coating tank; 70. a scraper; 80. and (3) soldering.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

Referring to fig. 1 to 6, the present invention discloses a method for assembling a medium and small power hybrid integrated circuit, which includes the following steps:

s101, gluing: coating conductive adhesive 20 and insulating adhesive 30 on the ceramic substrate 10, specifically coating the conductive adhesive 20 first, and then coating the insulating adhesive 30;

s102, a patch mounting step: placing the ceramic substrate 10 which is subjected to gluing into a surface mounting machine, mounting a plurality of devices 40 on the ceramic substrate 10 which is subjected to gluing, wherein the mounting is only adhesion, the devices 40 are signal transmission pieces or non-high-current conduction pieces, the devices 40 are mainly capacitors 41, IC chips 42 and the like, the devices 40 do not have high current to pass through, special consideration and design in the aspect of heat conduction are not needed, and the bottom of each capacitor 41 is coated with insulating glue 30 to play roles of isolating conduction and fixing;

s103, curing: placing the ceramic substrate 10 bonded with the device 40 into a curing furnace for colloid curing, wherein the temperature of the curing furnace is 150 ℃, and the time for colloid curing is 1 h;

s104, bonding: placing the cured ceramic substrate 10 into an automatic bonding machine, and bonding and interconnecting the cured ceramic substrate 10 and each device 40, mainly bonding and interconnecting an IC chip 42 and the ceramic substrate 10, the IC chip 42 and the IC chip 42, and bonding and interconnecting the IC chip 42 and a lead of a shell 50;

s105, a shell entering step: the bonded ceramic substrate 10 is fixed in the shell 50 by adopting an eutectic welding mode, so that the thermal resistance can be reduced, the heat dissipation capacity of a product is improved, the shell entering step is placed after the bonding step, the deep cavity surface mounting and bonding are avoided, the interference of the shell 50 to the assembly is reduced, and the assembly density is improved.

In the case entering step, the case 50 is first subjected to a pre-tinning process, the pre-processed soldering lug and the ceramic substrate 10 are placed into the case 50, and eutectic soldering is performed by the solder 80 generated by the soldering lug.

Before the gluing step, the method also comprises the following steps:

s100, printing: on the ceramic substrate 10, a wiring to be coated with the conductive paste 20 is printed, which is also referred to as an assembly drawing.

In this embodiment, the gluing step includes:

s1011, fixing the jig plate 60: placing a jig plate 60 on a ceramic substrate 10 printed with a circuit, wherein the jig plate 60 is provided with a coating groove 61 matched with the printed circuit on the ceramic substrate 10, and correcting the positions of the coating groove 61 and the printed circuit to ensure that the coating groove 61 and the printed circuit are arranged correspondingly;

s1012, coating conductive adhesive 20: filling the conductive adhesive 20 in the coating groove 61, and scraping the conductive adhesive 20 on the jig plate 60 by using a scraper 70;

s1013, coating insulating glue 30: the jig plate 60 is removed, and the insulating paste 30 is dispensed on the ceramic substrate 10.

In this embodiment, in the glue coating step, the conductive glue 20 may be coated on the printed ceramic substrate 10 by silk-screen printing, and then the insulating glue 30 is dispensed and coated.

In a preferred embodiment, the conductive paste 20 is a mixture of silver powder and a first polymer, the silver powder plays a role of electric conduction, and the first polymer is preferably an epoxy resin and plays a role of adhesion.

The insulating glue 30 is a second high polymer, in order to improve the bonding strength of the large-size device 40, the device 40 is reinforced by the insulating glue 30, and the second high polymer is also preferably epoxy resin and plays a role in bonding;

the step of entering the shell further comprises the following steps:

s106, transformer installation: mounting, namely adhering the transformer on the ceramic substrate 10 and curing;

s107, manually welding enameled wires on the product subjected to transformer installation;

s108, testing: debugging and detecting the performance of the assembled product to enable the product to meet the performance requirement;

s109, visually inspecting the product, and removing redundant materials in the product;

and S120, baking and parallel seam welding the product to finish assembly.

In the above steps S102, S103, and S104, a modification scheme of the equipment carrier may be proposed according to product characteristics, and a multi-step general carrier is designed to avoid frequent carrier replacement of the product.

In summary, the invention aims at the medium and small power thick film hybrid integrated circuit, eliminates the welding step of the device by adjusting the assembly process flow, combines the two bonding steps of the device 40, bonds before entering the shell, shortens the production flow, avoids the interference of the shell 50 on the bonding and the surface mounting, reduces the design difficulty of the product, simplifies the flow and improves the efficiency on the basis of ensuring the product quality and performance, improves the product assembly density because the design size of the bonding pad is smaller than that of the welding pad, is beneficial to the popularization of the application of the assembly method, and embodies the assembly advantages of the medium and small power products with the requirements of small current and low heat dissipation.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.