Protection method of magnetic component

Abstract

The invention belongs to the technical field of power supplies, and discloses a protection method of a magnetic component, which comprises the following steps of: hanging the magnetic component in a container of a vacuum equipment cavity upside down, pumping negative pressure in the vacuum cavity, generally setting the pressure parameter to be-0.9 MPa to-0.95 MPa, filling insulating paint into the container, and enabling the insulating paint to be insulated under the action of the pressure. The insulating paint permeates into the component from gaps of a coil and a magnetic core of the magnetic component, the magnetic component is kept to be impregnated with the insulating paint for a certain time, and the pressure maintaining time is usually set to be 15-30 minutes according to the size of the component. The method has the beneficial effects that the overall magnetic component is dip-coated with the insulating paint, so that the environmental adaptability of the magnetic component is improved, the component can achieve an IP65 protection effect, and the method can be directly applied to an air duct of a direct ventilation power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a method for protecting magnetic components. Background Art

[0002] Direct-flow power supplies are neither dustproof nor waterproof. Magnetic components in switching power supplies, such as inductors and transformers, are directly soldered to the PCB. These components are particularly large in high-power power supplies. These components, if exposed directly to the air duct, are susceptible to corrosion failure in harsh environments, such as offshore high humidity, high salt fog, or windy, dusty weather. Power supply manufacturers typically use methods like potting with AB glue and powder coating to enhance protection against magnetic component corrosion, but these methods also present operational difficulties and high costs.

[0003] Therefore, it is necessary to provide a protection method for magnetic components to improve the environmental adaptability of the magnetic components and enable the magnetic component body to reach the IP65 protection level. Summary of the Invention

[0004] The present invention discloses a method for protecting magnetic components, which is used in the power supply industry and the field of electronic component protection. It is an IP65 protection method for magnetic components in a direct-flow air supply, and can effectively solve the technical problems involved in the background technology.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A method for protecting magnetic components, comprising the following steps:

[0007] S1. Preheat the magnetic components and then cool them naturally;

[0008] S2. The surface of magnetic components is treated with impregnation insulating paint;

[0009] S3. Bake and solidify magnetic components.

[0010] Conventionally processed magnetic components have poor moisture-proof and anti-condensation properties and cannot be directly used in direct ventilation environments. Other protection methods in the industry (such as potting glue and powder spraying process) are complex and costly. To address this situation, the present invention applies insulating varnish to the protection of magnetic components in the power supply industry to improve the environmental adaptability of the magnetic components, so that the magnetic component body can reach the IP65 protection level and can be directly exposed in the air duct, greatly reducing the design difficulty and cost of direct ventilation power supplies.

[0011] As a preferred improvement of the present invention: in the step S1, preheating to 100-120°C and naturally cooling to 50°C or below.

[0012] As a preferred improvement of the present invention: the magnetic components include but are not limited to transformers, inductors and mutual inductors.

[0013] As a preferred improvement of the present invention: in step S2, the insulating varnish is impregnated in a vacuum manner.

[0014] As a preferred improvement of the present invention: before the surface of the magnetic component is impregnated with insulating varnish, the welding pins are protected with glue.

[0015] As a preferred improvement of the present invention: in step S2, the magnetic component is hung upside down in a container in the cavity of the vacuum equipment, negative pressure is drawn inside the vacuum equipment, and insulating paint is poured into the container.

[0016] As a preferred improvement of the present invention: in the step S2, when pumping negative pressure, the pressure parameter is set to -0.9 MPa to -0.95 MPa, and the pressure holding time is set to 15 to 30 minutes.

[0017] As a preferred improvement of the present invention: in step S2, the pins of the magnetic component face upwards, and the magnetic component is hung upside down into the container using a fixture, and the paint immersion height does not exceed the bottom plate of the magnetic component, but the magnetic component body needs to be completely immersed.

[0018] As a preferred improvement of the present invention: in step S2, after the impregnation is completed, the vacuum of the cavity is released, and the pressure in the cavity is increased again to 4-6 ATM, and the pressure is maintained for 30-60 minutes.

[0019] As a preferred improvement of the present invention: in the step S2, after the pressurization is completed, the magnetic component is transferred to the paint dripping trough, and the large pieces of insulating paint remaining on the magnetic component are allowed to drip into the paint dripping trough.

[0020] The beneficial effects of the present invention are as follows:

[0021] By dipping the entire magnetic component in insulating varnish, the environmental adaptability of the magnetic component is improved, so that the component can achieve IP65 protection effect and can be directly used in the air duct of the direct-flow ventilation power supply. The present invention uses a single-component insulating varnish with high toughness, high heat resistance and low volatility. The material is modified unsaturated polyester. Compared with traditional two-component insulating varnish, it does not require mixing and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0023] Figure 1 It is a structural diagram of magnetic components;

[0024] Figure 2 Schematic diagram of the impregnation process;

[0025] Figure 3 This is a schematic diagram of pin protection. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides a method for protecting magnetic components, comprising the following steps:

[0032] S1. Preheat the magnetic components and then cool them naturally;

[0033] S2. The surface of magnetic components is treated with impregnation insulating paint;

[0034] S3. Bake and solidify magnetic components.

[0035] As an embodiment, in step S1, the magnetic components are preheated to 100-120°C and naturally cooled to 50°C or below. The magnetic components include but are not limited to transformers, inductors, and mutual inductors. In step S2, insulating varnish is impregnated in a vacuum manner (normal pressure can also be used). Before the surface of the magnetic component is impregnated with insulating varnish, the soldering pins are protected with glue. In step S2, the magnetic component is hung upside down in a container in the cavity of a vacuum equipment, and negative pressure is drawn inside the vacuum equipment, and insulating varnish is poured into the container. When drawing negative pressure, the pressure parameter is set to -0.9MPa to -0.95MPa, and the pressure holding time is set to 15 to 30 minutes. In step S2, the pins of the magnetic component are facing upwards, and the component is hung upside down into the container using a tooling fixture. The varnish dipping height does not exceed the bottom plate of the magnetic component, but the magnetic component body needs to be completely immersed. In step S2, after the dipping is completed, the vacuum in the cavity is released, and the pressure in the cavity is re-inflated to 4 to 6ATM, and the pressure is maintained for 30 to 60 minutes. After the pressurization is completed, the magnetic component is transferred to a paint dripping tank, and the large pieces of insulating paint remaining on the magnetic component are allowed to drip into the paint dripping tank. It should be further explained that the use of other components to achieve the above-mentioned effects should fall within the inventive concept of the present invention and should fall within the scope of protection of the present invention.

[0036] Example 1

[0037] The present invention uses vacuum pressure impregnation process

[0038] 1. Preheat the magnetic components that need to be impregnated with insulating varnish to a certain temperature, usually 100-120°C, and then cool the components naturally to a certain temperature, usually ≤50°C.

[0039] 2. Hang the magnetic component upside down in the container of the vacuum equipment cavity, and draw negative pressure inside the vacuum cavity. The pressure parameter is generally set to -0.9MPa ~ -0.95MPa, and pour insulating varnish into the container. With the pins of the magnetic component facing upward, use a fixture to hang it upside down into the insulating varnish. The immersion height should not exceed the bottom plate of the magnetic component, but the magnetic component body must be completely immersed. Figure 2 .

[0040] 3. Under pressure, the insulating varnish penetrates the interior of the magnetic component through the gaps in the coils and cores. The magnetic component remains immersed in the insulating varnish for a certain period of time, typically 15 to 30 minutes, depending on the size of the component. The protective coating used in this embodiment is a high-toughness, high-heat-resistant, low-volatility, one-component insulating varnish. The material can be epoxy resin or unsaturated polyester. After curing, the insulating varnish has anti-condensation and salt spray properties.

[0041] 4. After the impregnation is completed, the vacuum in the cavity is removed and the pressure in the cavity is increased to 4-6ATM (standard atmospheric pressure) again, and the pressure is maintained for 30-60 minutes.

[0042] 5. After the pressurization is completed, transfer the magnetic components to the paint dripping tank and let the large pieces of insulating paint remaining on the body drip into the tank to prevent the surface from agglomerating and uneven after curing. The paint dripping time is usually 5 to 15 minutes.

[0043] 6. The magnetic components impregnated with insulating paint need to be baked and cured. Depending on the materials used, the baking temperature is generally 120-150°C and the baking time is 1-3 hours.

[0044] 7. Before dipping in paint, the soldering pins of magnetic components need to be protected with glue (including UV curing glue, silicone, epoxy glue, hot melt glue or other glue) to prevent the pins from being difficult to remove after being dipped in paint, causing the pins to be non-conductive.

[0045] Magnetic components treated with the present invention's process are completely coated with insulating lacquer, forming a protective layer that effectively protects inductive components from harsh environments such as moisture, salt spray, and sandstorms. Therefore, magnetic components treated with the present invention can be directly used in the air ducts of direct-current airflow power supplies without the need for additional protective treatment. The treatment process is simple, facilitates mass production, and is low-cost, solving the problem of protecting magnetic components in direct-current airflow power supplies.

[0046] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and the embodiments. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for protecting magnetic components, characterized in that: The following steps are involved: S1. Preheat the magnetic components and then cool them naturally; S2. The surface of magnetic components is treated with impregnation insulating paint; S3. Bake and solidify magnetic components.

2. A method for protecting magnetic components according to claim 1, characterized in that: In the step S1, the temperature is preheated to 100-120° C. and then naturally cooled to 50° C. or below.

3. The method for protecting magnetic components according to claim 1, wherein: The magnetic components include but are not limited to transformers, inductors and mutual inductors.

4. The method for protecting magnetic components according to claim 1, wherein: In the step S2, the insulating varnish is impregnated in a vacuum manner.

5. The method for protecting magnetic components according to claim 1, wherein: Before the surface of the magnetic component is impregnated with insulating varnish, the welding pins are protected with glue.

6. The method for protecting magnetic components according to claim 1, wherein: In step S2, the magnetic component is hung upside down in a container in the cavity of the vacuum equipment, negative pressure is drawn inside the vacuum equipment, and insulating paint is poured into the container.

7. A method for protecting magnetic components according to claim 6, characterized in that: In step S2, when pumping negative pressure, the pressure parameter is set to -0.9 MPa to -0.95 MPa, and the pressure holding time is set to 15 to 30 minutes.

8. The method for protecting magnetic components according to claim 6, wherein: In step S2, the pins of the magnetic component are facing upwards, and the magnetic component is hung upside down into the container using a fixture. The paint dipping height does not exceed the bottom plate of the magnetic component, but the magnetic component body needs to be completely immersed.

9. The method for protecting magnetic components according to claim 6, wherein: In step S2, after the impregnation is completed, the vacuum in the cavity is released, and the pressure in the cavity is increased again to 4-6 ATM, and the pressure is maintained for 30-60 minutes.

10. A method for protecting magnetic components according to claim 9, characterized in that: In step S2, after the pressurization is completed, the magnetic component is transferred to a paint dripping tank, and the large pieces of insulating paint remaining on the magnetic component are allowed to drip into the paint dripping tank.

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