Application of Laser Marking in Power Module

With the shortage of energy, there are more and more manufacturers of power modules and a wide variety of products. There are two major categories of AC-DC power modules and DC-DC power modules. DC-DC power modules have a huge production and sales volume. The marking content includes specifications and models, parameter descriptions, company LOGO, and pin definitions. Wait.

The material of the power module shell is divided into:

1. Plastic (civil products, large quantity and thin, suitable for non-heating shells, usually in the form of pasted paper labels and PVC stickers).

2. Aluminum shell oxidation treatment (civil products, screen printing is often used).

3. Copper spray paint (military products, small quantity and big profit, mostly screen printing).

4. Copper nickel-plated, copper-plated 锘(military products, suitable for shell heating, and special requirements for shielding grounding, etc.. Screen printing or heat-resistant plastic stickers are often used).

Problems with the old process:

1. Although the paper label is cheap, it affects the heat dissipation of the module. When the temperature rises, the paper label is easy to bulge, deform, or even fall off.

2. When the screen printing volume is large, it takes more time and labor. When there are many types, the layout changes are not flexible. The nickel-plated copper has a smooth surface and does not print well.

3. There are many types of module power supplies, and the unit price of paper labels is very expensive when the printing volume is small.

4. The paper label has been stored in the warehouse for a long time, it is easy to lift up, and the adhesive is easy to fail and affect the stickiness.

5. The wide variety of products makes it easy for workers to make mistakes when labeling, and the labor intensity is high.

6. For the varieties with a small quantity, the paper label printing cost is high, just use the printer to print and paste directly, like the laboratory product, not showing the grade.

Requirements for laser marking:

1. Plastic: The composition of plastic is complex, and the effects of laser marking machines are very different. It is recommended that module manufacturers ask their housing suppliers to change the composition ratio of plastics until a clear and exquisite logo is printed. Will not affect the protective effect of the shell.

2. Aluminum shell oxidation treatment: The effect of laser marking machine is very good. The newly exposed aluminum gradually oxidizes and changes color, but there is still obvious contrast, especially the black shell, the contrast color is more obvious. Alumina is relatively stable and will not affect the protective effect of the shell.

3. Copper spray paint: The laser marking machine can only remove the paint layer to reveal the background color of the copper. The manufacturer is worried that the green patina will affect the appearance after a long time. According to the manufacturer's process test, the effect is still no problem.

4. Nickel-plated copper, nostalgic copper-plated: The thickness of the coating is 7-8U, and 4U is required to avoid damage to the coating. The marking effect of the laser marking machine is very good.

Laser marking technology, as a non-contact modern precision processing method, can be marked on the surface of the power module housing, the workpiece will not produce deformation and internal stress, high-precision processing quality can be obtained, and the uniformity of the processing quality Guaranteed. The use of a vision system to assist laser marking can make the advantages of laser processing more comprehensive, which not only solves the accuracy problem of marking, but also has high adaptability. No need to use fixtures, reduce costs, and improve the automated process of the product line. Reduce manual participation and improve system efficiency.